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Open Access Article
1 - Analysis of Kuroshio Current Converter as Renewable and Environmentally Friendly Power Plant
امیر قائدیIntroduction: Among different renewable energy sources, ocean is considered as one of the renewable energy sources that has a wide geographical range. Marine currents have different categories that tidal currents are among these currents. Near Japan, there is a current MoreIntroduction: Among different renewable energy sources, ocean is considered as one of the renewable energy sources that has a wide geographical range. Marine currents have different categories that tidal currents are among these currents. Near Japan, there is a current in the ocean known as the Kuroshio Current, which has a high potential for generating electricity. These currents have speed and consequently kinetic energy and can generate electricity by using turbines installed deep in the ocean. One of the problems that these currents have is that they change over time and therefore the power generation of energy converters of Kuroshio currents also varies. Therefore, the effect of these changes on different aspects of these converters such as reliability should be investigated. Materials and Methods: In the reliability model of the current converter, both the component failure and output power variations, which are caused by the change in the speed of ocean currents are considered. Results and Discussion: In this part, a Kuroshio Current energy converter that includes a turbine with a diameter of 2 meters is considered. In this part, the reliability indices of a sample test system are obtained, and then the effect of Kuroshio Current power plants on these indices is evaluated. The results show that as the peak load of the system increases, the reliability of the system deteriorates. Conclusion: In this paper, the reliability model of Kuroshio Current converters is obtained. Numerical results conclude that the Kuroshio Current converters can improve reliability indices of power system. Manuscript profile -
Open Access Article
2 - Design and simulation of an EMC filter for a flyback converter
atila eskandarnezhad عبدالعزیز کلته Nowruz AbdollahiElectronic equipment's require supply voltage with different values that can create a stabilized voltage at the output in the conditions of changing the source voltage and load current. The flyback switching converter is a suitable option for producing different voltag MoreElectronic equipment's require supply voltage with different values that can create a stabilized voltage at the output in the conditions of changing the source voltage and load current. The flyback switching converter is a suitable option for producing different voltages in such conditions. Due to the high frequency switching, the electromagnetic components with significant power are directed from the converter side to the power lines and also radiated to the surrounding space, which causes electromagnetic pollution and EMI radio interference. In this article, an effective and practical method for designing and adjusting the EMC electromagnetic compatibility filter is presented. Adjusting the filter values is based on averaging the noise circuit by considering its equivalent impedance. In most of the proposed methods for filter design, the noise source is assumed as an ideal current source and the equivalent impedance of the noise is not considered. This reduces the accuracy of the design and prevents the correct filtering of the components in some frequencies. In this article, the circuit averaging of the entire structure of the converter is done by considering the parasitic elements, because the closer the presented model is to the real structure, the more effective the filter is, and the more effectively it removes radio interference components. In the end, the software simulation shows the accuracy and efficiency of the proposed method in EMI filter design. Manuscript profile -
Open Access Article
3 - Investigation of physical parameters in ion-beam-heated converters
Abbas Ghasemizad Mahboubeh Masoumi Leila Gholamzadeh -
Open Access Article
4 - Designing Optimal Neural Networks Controller to Regulate and Control the Output Voltage of DC-DC Boost Converters
Mohammad Zaraei Majid Moradi Zirkohi Najmeh Cheraghi ShiraziDue to the many applications of DC to DC converters in electronics, regulating their output voltage is very important. In many applications it is necessary to change the DC voltage from one level to another. DC -DC converters are used for this purpose. The conversion of MoreDue to the many applications of DC to DC converters in electronics, regulating their output voltage is very important. In many applications it is necessary to change the DC voltage from one level to another. DC -DC converters are used for this purpose. The conversion of DC voltage from one level to another is done by switching elements such as transistors and diodes. Recently, the control of these converters has found a special place in scientific texts. Therefore, one of the objectives of this paper is to control and regulate the output voltage of the converter. The controller proposed in this paper to control the DC voltage level of the converter output is an optimized neural network controller with an algorithm based on colonial competition. The proposed controller function is that first the neural network is designed according to the expected goals of the system and then it is optimized by determining a suitable multi-objective benchmark function using the network structure optimization algorithm. This improves the performance of the control system. Because the proper selection of design parameters has a great role in the performance of the neural network that plays the role of controller. The proposed neural network function is to apply the appropriate signal transducer (PWM signal) to the switching elements in order to increase the performance. The results compared to the PID controller indicate the superiority of the proposed method. Manuscript profile -
Open Access Article
5 - Improvement of SNDR using Optimization of Feedback Path Coefficients for Second Order CRFB Modulators in Sigma-Delta Analog to Digital Converters
Maryam Shahriary Abdolrasool Ghasemi najmeh cheraghi shiraziAnalog to digital converters are divided into two categories, Nyquist rate converter and oversampling converter, in terms of sampling frequency. At oversampling converter, input signal are sampled at several times the Nyquist rate. Increasing the over sampling rate lead MoreAnalog to digital converters are divided into two categories, Nyquist rate converter and oversampling converter, in terms of sampling frequency. At oversampling converter, input signal are sampled at several times the Nyquist rate. Increasing the over sampling rate leads to an increase in effective resolution, but although the use of high sampling rate for wide band signals is impractical due to the need for high sampling frequency and power consumption. Increasing the number of bits also increases the dynamic range as opposed to the multi-bit DAC required in the linear feedback path. In this paper, we designed sigma delta structure with 12 bit resolution, 1-v power supply for low power applications. on the other hand, increasing levels of quantization(number of bits) causes the reduction in-band noise power of the system, as well as the modulator stability improves without need increasing oversampling ratio. The maximum value of a signal-to-noise-and-distortion ratio(SNDR) will be achieved by means of choosing appropriate feedback coefficients. Simulation results of a 12-bit,2.4-MS/s , and 1-v proposed structure in a 0.18-µm CMOS technology show a signal-to-noise-and-distortion ratio (SNDR) of 71.3 dB, a power consumption of 451µW, and figure of merit 3.76(pJ/Conver.step.) Manuscript profile -
Open Access Article
6 - A High Accuracy Capacitance-to-Digital Converter with Improving Nonidealities Effects
Arash Ahmadpour Mehdi Fallah KazemiThis paper presents a high-precision capacitance-to-digital converter (CDC) based on period-modulation (PM) for grounded capacitive sensors. In this work, with a symmetrical design, the performance of the proposed capacitance to digital converter is significantly improv MoreThis paper presents a high-precision capacitance-to-digital converter (CDC) based on period-modulation (PM) for grounded capacitive sensors. In this work, with a symmetrical design, the performance of the proposed capacitance to digital converter is significantly improved by applying zoom-in and three signal auto-calibration techniques. The dominant nonidealities of the CDC circuit are located at the three asymmetrical phases of the auto-calibration pathes. These effects are investigated here which are mainly caused by charge injection of switches and associated parasitic effects. These nonidealities are reduced by utilizing dummy switches at asymmetrical paths of the applied auto-calibration. The proposed interface is designed as an integrated circuit using a standard 0.18μm CMOS technology. A worst-case capacitance error less than 0.2fF for a 10pF sensor capacitor with maximum variation of 200fF, and parasitic capacitance of up to 20pF is obtained. The CDC achieves an absolute capacitance resolution of 0.479fF across a 10pF sensor capacitance with a 200fF variation, corresponding to an energy efficiency of 6.94pJ/step. The achieved latency is 128µs and the CDC consumes 170µA from a 2V power supply. Manuscript profile -
Open Access Article
7 - Design of a digital-to-analog converter with a working frequency of 1Gs / s and a resolution of 12bit
Ghader Yosefi Shilan Neda Masoud DostiThis paper presents the design and implementation of a digital-to-analog converter with a frequency of one billion samples per second and a resolution of 12 bits in the standard process of 0.35um CMOS technology. This included designing new circuits that converted the c MoreThis paper presents the design and implementation of a digital-to-analog converter with a frequency of one billion samples per second and a resolution of 12 bits in the standard process of 0.35um CMOS technology. This included designing new circuits that converted the converter, with good INL results (0.7LSB for 8 bits and 0.8LSB for 12 bits). Also, SFDR with Fsig = 125Meg and Fs = 500Meg is about 73dB and for Fsig = 125Meg and Fs = 1G is about 60dB by calculating the total capacitance of the layout. Total power consumption 180mw and works with 3.3v and 2v power supplies. According to the designed layout, the occupied surface of the chip is 0.313mm2 and four metals and two polyes are used and the simulation results are done by Hspice software. Manuscript profile -
Open Access Article
8 - Low-offset and high-gain up-amp design in analog to digital cyclic converter Twelve bits for CMOS image sensor
Asghar Ebrahimi Mina ShiraliIn this paper, an analog-to-digital twelve-bit cyclic converter with high speed and accuracy and yet low power is proposed. Requires a wide dynamic range and high speed and high accuracy, which is suggested in this article. Finally, this circuit was simulated with HSPIC MoreIn this paper, an analog-to-digital twelve-bit cyclic converter with high speed and accuracy and yet low power is proposed. Requires a wide dynamic range and high speed and high accuracy, which is suggested in this article. Finally, this circuit was simulated with HSPICE software and acceptable results were obtained. This circuit requires a voltage of 3.3 and in The technology is 0.35. The power consumption is 11 mW and the SFDR is 66 dB and the THD is 2 - and the SNDR is 40 dB. Shooting for different setting conditions. Manuscript profile -
Open Access Article
9 - Design of a robust controller for a parallel resonance converter using μ synthesis
Hossein Rozegar Amir Yaghobi Mehrzad NasiriyanDc-dc resonator converters have recently received a lot of attention in power supplies. These converters have a great ability to convert energy from one level to another with high performance, which does not have the problems of conventional converters based on the clas MoreDc-dc resonator converters have recently received a lot of attention in power supplies. These converters have a great ability to convert energy from one level to another with high performance, which does not have the problems of conventional converters based on the classic PWM method and therefore can be used as smaller and lighter power supplies in aerospace, industrial, and residential applications. Be used. To do this, a suitable control circuit with the ability to keep the desired output voltage constant under different operating conditions is required. For this purpose, small-signal models obtained around the nominal operating point were previously used to keep the output voltage constant in the presence of input perturbations. However, these controllers did not take into account changes in load and orbital elements, so changing them could easily lead to system instability. In this paper, we design a robust controller for this resonant converter using μ synthesis. In addition to ensuring stability for a wide range of load changes, this controller also eliminates input disturbances and adjusts the control input and sitting time well. Manuscript profile -
Open Access Article
10 - Improved of Linearity Performance With low Common-mode Voltage Variations for Non-binary Successive Approximation ADC With a Monotonic Switching method
Nasrin Shayestehnezhad عبدالرسول GhasemiIn this paper, a fully differential successive approximation A/D converter is presented using the extended non-binary search algorithm with an accuracy of 10-bits, 11 comparison steps, and the sampling rate of 4.17MS/s which is suitable for low-power applications becaus MoreIn this paper, a fully differential successive approximation A/D converter is presented using the extended non-binary search algorithm with an accuracy of 10-bits, 11 comparison steps, and the sampling rate of 4.17MS/s which is suitable for low-power applications because it does not require to be calibration. In the non-binary search algorithm, there are overlaps between the search rang, that allow comparison decision errors to be digitally corrected. To improve the linear behavior of the proposed structure, a capacitive array D/A converter with non-binary weight is implemented, and the sampling frequency is increased compared to the conventional successive approximation converter through proper selection of non-binary capacitances of the capacitive array. The proposed structure operates based on monotonic switching logic. This switching method reduces the power consumption of DAC compared to conventional switching. The proposed structure is designed using 180nm CMOS technology and the simulation results show that for a supply voltage of 1.8V, signal to noise and distortion ratio (SNDR) is 61.35dB, power consumption is 78.14µW, and figure of merit is 19.57(fj/Conv.step). Manuscript profile -
Open Access Article
11 - Design of Voltage Level Converter Circuit with high Power Efficiency for Low Voltage Applications
Vahidreza Saboori Abdolrasol Ghasemi Najmeh Cheraghi ShiraziIn This Article represented effective voltage level converter that changeable more low level voltage to high level for high frequency application. In order to avoid the static power dissipation, the proposed structure uses a current generator which turns on only during MoreIn This Article represented effective voltage level converter that changeable more low level voltage to high level for high frequency application. In order to avoid the static power dissipation, the proposed structure uses a current generator which turns on only during the transition times in which the logic level of the input signal is not corresponding to the output logic level. The operation of the proposed structure is also analytically investigated in 0.18um CMOS technology that show proposed voltage level converter at high frequency has good performed.in higher than of 1GHz frequency proposed voltage level make delay about one of period that with an inverter we have best operation. Manuscript profile -
Open Access Article
12 - Low offset comparator design in analog to digital 12-bit cyclic converter
Asghar Ebrahimi Mina ShiraliIn this article, a high-speed analog-to-digital column-parallel converter with a small 12-bit resolution on both sides of the image sensor is proposed. This article also proposes a comparator with low offset. A method for accelerating the conversion speed using synchron MoreIn this article, a high-speed analog-to-digital column-parallel converter with a small 12-bit resolution on both sides of the image sensor is proposed. This article also proposes a comparator with low offset. A method for accelerating the conversion speed using synchronization of variables (variable clock) and sampling capacitors have been developed. The pixel load amplifier achieves a light sensitivity of 9.19 V/lxs. The full signal size at the pixel output is 1/8V at the 3/3V power supply and the noise level is 1.8 and the dynamic signal amplitude is 60db. Finally, this circuit was simulated with HSPICE software and acceptable results were obtained. This circuit requires a voltage of 3.3V and is 0.35um in technology. Power consumption is 11 mW and SFDR is equivalent to 66dB, THD is equivalent to -2 and SNDR is equivalent to 40dB. Manuscript profile -
Open Access Article
13 - A Single loop Feed Forward Sigma-Delta Modulator for GSM Standard
Mohsen Beiranvand Ebrahim Rahimi Gholamreza Babaabasi -
Open Access Article
14 - High Step-up Switched-Capacitor Current-Fed Soft-Switching Converter
Jalil Jalili Sayyed Mohammad Mehdi Mirtalaei Mohammad Reza Mohammadi Sayyed Behrooz MajidiIn this paper, a non-isolated current-fed high step-up soft-switching converter, is presented. In proposed converter are used of 2-stge switched capacitor and a soft switching active cell. Compared to its high step-up counterpart, the proposed converter has a higher vol MoreIn this paper, a non-isolated current-fed high step-up soft-switching converter, is presented. In proposed converter are used of 2-stge switched capacitor and a soft switching active cell. Compared to its high step-up counterpart, the proposed converter has a higher voltage gain. In this converter, an active clamp circuit is used to absorb the energy of leakage inductor, therefore, the ZVS for switches. Also, voltage stresses on the switches are low. In this paper, the operational principle and characteristics of proposed converter are presented, and in order to verify the proposed converter, a 20-400V, 200W prototype converter is simulated and implemented and experimental results are provided. Manuscript profile -
Open Access Article
15 - A Soft Switching Boost Converter with an Active Coupled Inductor Snubber Circuit
Hadi Faezi Majid Zamani Mohammad Ali LatifzadehIn this paper, a new soft switching boost converter is presented. A lossless active snubber circuit including an auxiliary switch, three diodes, a capacitor and a coupled-inductor provides soft switching conditions for the main switch and the output diode, so that the m MoreIn this paper, a new soft switching boost converter is presented. A lossless active snubber circuit including an auxiliary switch, three diodes, a capacitor and a coupled-inductor provides soft switching conditions for the main switch and the output diode, so that the main switch and the output diode operate under ZCS and ZVS conditions, respectively. They turn on and off under the ZCS condition. The operation of the snubber circuit is associated with low current stress on the main switch and low current and voltage stress on the output diode. The proposed converter is able to maintain the smooth switching condition in a wide range of output load and input voltage variations. Working principles, steady state analysis and design procedure of this converter are discussed in detail. Also, to confirm the theoretical results, a laboratory sample is made and tested. It should be noted that, The laboratory results confirm the theoretical results comprehensively. Manuscript profile -
Open Access Article
16 - Modeling and Analysis of SEPIC Converter Stability by Gray Wolf Multi-Objective Algorithm
Seyed Mohamad Naji Esfahani Seyed Hamid Zahiri Majid DelshadThis paper investigates the closed loop stability of the SEPIC converter using an optimal PID controller; In this model, the parameters are adjusted using the Gray Wolf Multi-Objective (MOGWO) algorithm. The Gray Wolf Multi-Objective Algorithm is a random evolution-insp MoreThis paper investigates the closed loop stability of the SEPIC converter using an optimal PID controller; In this model, the parameters are adjusted using the Gray Wolf Multi-Objective (MOGWO) algorithm. The Gray Wolf Multi-Objective Algorithm is a random evolution-inspired random algorithm that has been widely used in recent years as an optimization technique in power electronics. The state mode average method has been used to model and achieve the transducer-based system transfer function. Therefore, the MOGWO-based PID controller has been studied and implemented in the system to enable the converter stability to be evaluated and compared with conventional PID controllers. To evaluate the stability of the system, various performance parameters such as overtaking percentage, peak time, settling time and peak size have been considered. The impact response of the closed-loop system is obtained by simulation in MATLAB. The performance of the model is evaluated to perform a general comparative analysis of the system. Manuscript profile -
Open Access Article
17 - A Two Input High Step Converter with Zero Current Switching Condition for Switches Turn-On Instances
Mahmood Vesali Hosein Ranjbar Amin Motamedi-NasabA high step-up two-inputs DC-DC converter is presented in this paper. The soft switching condition is provided for switch in turn on instant, so the converter efficiency is high. Due to the fact that only the capacitor is used to increase the voltage gain and there are MoreA high step-up two-inputs DC-DC converter is presented in this paper. The soft switching condition is provided for switch in turn on instant, so the converter efficiency is high. Due to the fact that only the capacitor is used to increase the voltage gain and there are no coupled inductors in the converter, the input current of the converter is continuous. The technique used to increase gain can be used with more stages to achieve higher voltage gain. The converter can also be used as a single input intertwined instead of two inputs, which in this case the input current ripple is reduced. The voltage stress on the switches is lower than the output voltage, so lower voltage switches can be used, which reduces the converter cost. The proposed converter is completely analyzed and in order to prove the theoretical results, a simulation is performed on the converter at 500 watts. The results of the simulation at full load show an efficiency of about 95.5%. Manuscript profile -
Open Access Article
18 - Designing and Simulating of Step-Up DC-DC Converter for Fuel Cell Electric Vehicles
Maher Abdulnabi Alwan Ghazanfar ShahgholianStep-Up DC-DC Converters are widely used in electric vehicles, because the use of batteries and fuel cells increases the voltage level to drive the electric motor. One of the problems of step-up converters is the increase in volume and weight due to step-up transformers MoreStep-Up DC-DC Converters are widely used in electric vehicles, because the use of batteries and fuel cells increases the voltage level to drive the electric motor. One of the problems of step-up converters is the increase in volume and weight due to step-up transformers. So far, various methods, such as switched capacitor, coupled inductor and multiplier circuits, have been used to eliminate the transformer and reduce the volume and weight of the circuit. To further reduce the volume and weight of the circuit, it is necessary to increase the switching frequency, which is possible only by using the soft switching method. Using an auxiliary switch to create soft switching conditions is common in most methods, because not using an auxiliary switch imposes voltage and current stress on the circuit. In this article, a step-up converter with an auxiliary circuit of zero voltage transition (ZVT) is presented, which provides switching conditions at zero voltage to turn on the switch and switching at zero voltage to turn off the switch. The voltage stress of the converter is very low, and all the diodes are switched off at zero current, so they do not have reverse recovery problems. Also, in addition to absorbing the energy of the leakage inductor, the clamp capacitor helps to increase the gain of the converter. The provided converter is simulated in P-Spice software. To check the performance of the converter, a laboratory model with a power of 150 watts has been designed and tested. Manuscript profile -
Open Access Article
19 - Providing a Dual-Input Soft-Switching Boost Converter with Power Factor Correction Capability
Mohammad Reza Amini Mohammad Foroughi Ehsan Adib Mohammad Rouhollah YazdaniMulti-input converters have different structures. These converters can be used in applications of power systems based on wind, photovoltaic, hybrid vehicles, etc. In a multi-input system, usually one of the inputs is connected to an AC source. Also, these converters use MoreMulti-input converters have different structures. These converters can be used in applications of power systems based on wind, photovoltaic, hybrid vehicles, etc. In a multi-input system, usually one of the inputs is connected to an AC source. Also, these converters use soft switching techniques to increase efficiency. In this paper, a non-insulated dual input soft-switching boost converter with power factor correction capability is proposed. This converter uses only an auxiliary circuit with simple operation. The operation modes of the proposed converter are described. All of the semiconductor elements in this converter turn on and off in soft switching conditions. The proposed controller circuit is presented with power factor correction capability. The converter is simulated with PSIM and THD and PF shows that the power factor correction in AC input is occurred correctly. The efficiency of the proposed converter is increased in comparison with the multi-input hard switching converter under the same conditions. The simulation results with PSpice for a 200-watt prototype converter confirm the theoretical analysis. Manuscript profile -
Open Access Article
20 - ANew Soft Switching Two Input Converter for Hybrid Green Energy Systems
Ahmed Abdulkadhim Issa mohammad hosein ershadiIn this paper, a new two-input converter with zero voltage switching for green energy hybrid systems is presented. In the proposed converter, a new auxiliary circuit is used to create zero voltage switching with the least number of auxiliary elements. The auxiliary circ MoreIn this paper, a new two-input converter with zero voltage switching for green energy hybrid systems is presented. In the proposed converter, a new auxiliary circuit is used to create zero voltage switching with the least number of auxiliary elements. The auxiliary circuit not only provides zero voltageswitching conditions, but also absorbs the energy of the leakage inductance and prevents voltage spikesacross the main switches. On the other hand, the use of coupled-inductors also increases the gain of the converter and greatly reduces the voltage stress on the switches. The proposed converter has been designed with a 120 watts power and simulated in PSICE software, and also a prototype has been made to prove the theoretical analysis of the circuit. Manuscript profile -
Open Access Article
21 - The Charging Circuit of the Energy Storage System of the Multi-Input Converter with High Gain (Design, Simulation and Laboratory Investigation)
Donya Taheri Ghazanfar Shahgholian Mohammad Mehdi MirtalaeiIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by co MoreIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by combining them, it is possible to use switches with low voltage stress and as a result, low conductivity. The charging performance of the energy storage system is explained and the structure and performance of the proposed converter are investigated for the design of a non-isolated multi-input converter with high voltage gain. The precise design method for the correct operation of the converter is presented and the simulation results of the converter performance are shown. Finally, in order to verify the accuracy of the results obtained from the simulation of the proposed converter, a laboratory sample has been made and a comparison has been made between the results. Manuscript profile -
Open Access Article
22 - A Single-Switch DC-DC High Step-Up Converter with Soft Switching for Photovoltaic Applications
Tayebeh Shamsi Majid Delshad Ehsan Adib Mohammad Rouhollah YazdaniA single-switch DC-DC high step-up converter is presented in this paper. There are soft switching conditions in the proposed converter for switching on and off time, which increases efficiency. In order to increase the gain, two coupled inductors have been used, and the MoreA single-switch DC-DC high step-up converter is presented in this paper. There are soft switching conditions in the proposed converter for switching on and off time, which increases efficiency. In order to increase the gain, two coupled inductors have been used, and the leakage inductance of the coupled inductors has been used to create a soft switching condition, and the minimal auxiliary element has been used in the proposed converter. In the proposed converter, only one switch is used, and the condition of the converter is no different from a basic converter in terms of the control circuit. Therefore, the converter does not need to design a new control circuit. The auxiliary circuit added to the converter with a minimal element, provides soft switching conditions for the switch at turn-on, under zero current and at turn-off, under zero voltage, which, in addition to increased efficiency, the circuit has a simple structure. Therefore, the innovation of the paper is to present a switching converter high step-up soft without imposing an additional switch and with a low number of elements. The proposed converter is simulated after full theoretical analysis at 400 W output power, which shows the efficiency of 97.2 percent, in addition to proving the theoretical analysis. Also, the prototype of the converter is made and the experimental results obtained prove the theoretical and simulation results. Manuscript profile -
Open Access Article
23 - High Step-Up Cascaded Boost Converter with Coupled Inductor and Lossless Passive Snubber
Zainab Abdul Ameer AL-Dabbagh Mohammad Rouhollah Yazdani Fadhil Abbas Hassan H. Al-AshaaAn effective high-step-up DC-DC converter is an important section of renewable energy systems. Cascaded boost converters provide more voltage gain than single boost converters, but they are still unsuitable for high step-up voltage conversion due to gain and hard switch MoreAn effective high-step-up DC-DC converter is an important section of renewable energy systems. Cascaded boost converters provide more voltage gain than single boost converters, but they are still unsuitable for high step-up voltage conversion due to gain and hard switching conditions. To improve the voltage, gain of the cascaded boost converter, a coupled inductor can be used but the leakage inductance causes a voltage. To overcome these problems, a high step-up converter is proposed in which a cascaded structure, coupled inductor, and a lossless passive snubber are utilized together. The proposed converter has zero current and zero voltage switching conditions at turn-on and off instants. First, the proposed converter is theoretically analyzed, and then its design and simulation in OrCAD software are presented. Furthermore, the experimental results of the prototype verify soft switching conditions and high step-up gain. Manuscript profile -
Open Access Article
24 - A New High Step-Down Converter with Lossless Passive Snubber
Elham Gerami Majid Delshad Mohammad Reza Amini Mohammad Rohollah YazdaniIn this paper, a new non-isolated soft switched DC-DC converter with high step-down conversion ratio is proposed. The proposed converter consists of two switch cells that their inputs and outputs are cascaded. This converter provides ultra-high step-down conversion rati MoreIn this paper, a new non-isolated soft switched DC-DC converter with high step-down conversion ratio is proposed. The proposed converter consists of two switch cells that their inputs and outputs are cascaded. This converter provides ultra-high step-down conversion ratio and due to all semiconductor devices are soft switched, switching losses are reduced, also reverse recovery losses of diodes are reduced because of ZCS turn off condition. The duty cycle of proposed converter is much larger than step-down converter and therefore does not have the problems of the converter with a narrow duty cycle and since no auxiliary switch is used to achieve soft switching, the control circuit remains simple. In this paper, the convertor operating modes are discussed and to verify the performance of the converter a 50W prototype with 100 kHz switching frequency, 100V input and 16V output is built. The converter efficiency is measured and the peak efficiency is 94% also the conducted electromagnetic interference peak in the proposed converter is reduced by 6dBµv. Manuscript profile -
Open Access Article
25 - An Isolated Bidirectional Converter with Zero Current Switching for Photovoltaic Applications
Abdulrahman Salim Babak KeyvaniIn this paper, a new isolated bidirectional converter is presented so that by using a new snubber without any additional switch, soft switching is provided for both main switches and the energy of the snubber circuit is transferred to the output. The number of proposed MoreIn this paper, a new isolated bidirectional converter is presented so that by using a new snubber without any additional switch, soft switching is provided for both main switches and the energy of the snubber circuit is transferred to the output. The number of proposed converter elements is low and its control is very simple because only one switc5h operates on each side and the other switch does not take command signal. One of its features is not using separate inductors in the snubber circuit and using the third coil for the snubber circuit. The performance of the proposed converter has been fully analyzed and simulated in PSPICE software, the results of which confirm the theoretical analysis of the converter. On the other hand, an 80W prototype has been made from it, and its practical results have been presented. Manuscript profile -
Open Access Article
26 - An Approach Design Of zero-voltage-transition Boost Converter With Coupled Inductors
P. palanidash -
Open Access Article
27 - Development and Analysis of a Novel 30° Sector-Based Switching Scheme for Matrix Converter Based DTC of IM Drive
Saeedeh Lotfi Mohammad Abad S. Sina Sebtahmadi H. Reza MomeniThis paper investigates the sophisticated analysis of a novel switching strategy for a matrix converter (MC) based direct torque control (DTC) of an induction motor (IM) drive. The proposed switching paradigm utilizes twelve 30° sectors for both flux and voltage vec MoreThis paper investigates the sophisticated analysis of a novel switching strategy for a matrix converter (MC) based direct torque control (DTC) of an induction motor (IM) drive. The proposed switching paradigm utilizes twelve 30° sectors for both flux and voltage vectors. Analytical expression of change rates of torque and flux for IM as a function of MC’s voltage vectors are derived. The influence of MC’s voltage vectors on the stator flux and electromagnetic torque variation is scrutinized and an advanced switching scheme independent of any load and speed variation is developed. To decrease the switching losses of MC, the optimum switching state is selected by means of discretization and averaging on the flux variations. The performance of the proposed switching strategy is corroborated under rated conditions, and is also compared to the conventional hexagonal boundary switching scheme. The proposed method is characterized by low torque ripples, no need for rotational coordinate transformation and minimized switching frequency. The results verify that the degree of freedom to select proper voltage increases, and the torque ripple is hence significantly reduced up to 40%. Manuscript profile -
Open Access Article
28 - A Comparison between OTC and P&O MPPT Control Methods Applied to Small Sized Wind Power Plants
Shirmohammadi ramin Ali ajami -
Open Access Article
29 - Direct Exact Feedback Linearization based control of the of the Output Voltage in the Minimum phase DC-DC Choppers
Samira Siami Mahdi Salimi -
Open Access Article
30 - Design and Analyses of a PWM based Seven Level CascadeCombination Inverter
Mortaza Sefidi Mehdi Jarahi -
Open Access Article
31 - The compression of MPPT methods in small sized wind power plants
Ramin shirmohammadi Vahid rezanejad Ali ajami -
Open Access Article
32 - Analysis and Simulation of an Augmentated DC-DC Converter With the Ability to Remove the Flow of Input Stream
Faezeh Ebrahimzadeh1 Ebrahim Babaei -
Open Access Article
33 - The Novel Control Method for Photovoltaic Converter to the National Grid
ParisaAlipour Alipour MahdiSalimi Salimi -
Open Access Article
34 - An Improved RNS Reverse Converter in Three-Moduli Set
Navid Habibi Mohammad Reza Salehnamadi -
Open Access Article
35 - A Kinetic Study of Vanadium Dissolution During Acetic Acid Leaching of Steel Making Converter Slag
Seyed Amirhossein Emami Mohammad Reza Kelishadi -
Open Access Article
36 - A Fuel-Cell Based Boost Converter Model Using Euler-Lagrange Equation
Atila Skandarnezhad -
Open Access Article
37 - Small Signal Modeling of a Synchronous Isolated Cuk Converter used in Photovoltaic Systems
Atila Skandarnezhad Yaghoob Mohammadmoradi Nader Javadifar -
Open Access Article
38 - Improved Low Voltage - Ride Through (LVRT) Performance of an Active Distribution Grid by Providing a Bidirectional Converter to Control DC Bus Voltage Ripple
afshin kadri Reza Ebrahimi Edris Pouresmaeil -
Open Access Article
39 - SEPIC Converter Based Maximum Power Point Tracking of a Photovoltaic System Using State-Space Feedback Controller
Ahmad Moghassem Nader Javadifar -
Open Access Article
40 - The Application Three-phase to Single-phase Z-Source Matrix Converter in Wind Turbine
Vahid Asadirad Seyed Babak Mozafari Soodabeh Soleymani MorchehkhortiIn this paper a new idea of direct three-phase to single-phase Z-source matrix converter (impedance-source matrix converter) applicable in stand-alone wind turbine is introduced. In the direct Z-source matrix converter amplitude of output voltage and frequency regulatio MoreIn this paper a new idea of direct three-phase to single-phase Z-source matrix converter (impedance-source matrix converter) applicable in stand-alone wind turbine is introduced. In the direct Z-source matrix converter amplitude of output voltage and frequency regulation are of importance to control system. In wind turbines, input voltage and frequency are usually changing due to wind speed variation that these alterations could be easily regulated by means of a direct Z-source matrix converter. A scheme is also offered to control the proposed direct three-phase to single-phase Z-source matrix converter. the control strategy would be able to adjust the output voltage and frequency at desired value as well as producing low THD (total harmonic distortion) at the output voltage. The proposed structure and the control methodology are simulated using matlab simulink software and results are investigated and discussed to confirm the performance of the direct Z-source matrix converter in wind turbine. Manuscript profile -
Open Access Article
41 - A Novel Transformerless DC–DC Converters With High Step-Up Voltage Gain And Low Voltage Stress On The Switch
hossein ajdarfaeghi Mohammadreza BanaeiIn this paper, a single switch transformerless high step up dc-dc converter with low voltage stress on the switch is proposed. In the proposed converter only one switch is used which makes the control scheme simple as well as reducing the switching power loss. The volta MoreIn this paper, a single switch transformerless high step up dc-dc converter with low voltage stress on the switch is proposed. In the proposed converter only one switch is used which makes the control scheme simple as well as reducing the switching power loss. The voltage gain of the proposed converter is higher than the conventional boost converter and buck boost converter and Proposed converter works in wide rang than conventional converters. The proposed converter has low voltage stress on the switch which makes reducing the switching power loss. The proposed converter can be operated in the continuous conduction mode (CCM) and the discontinuous conduction mode (DCM). In this paper, different operation modes of the proposed converter, calculation of the voltage gain, the currents that flow through the components, efficiency and capacitors voltage ripple are presented. To verify the operation of the proposed converter, simulation results via PSCAD software and experimental results are provided. Manuscript profile -
Open Access Article
42 - Analysis of a High Step-up Boost-Flyback Converter for Solar Energy Applications
Mohammad mehdi Mirtalaee Razieh JaberiIn this paper an interleaved boost-flyback converter which was suitable for network connections of renewable energy sources is presented. Because in the solar system applications, level difference of the converter input and output voltage is high, boost converter cannot MoreIn this paper an interleaved boost-flyback converter which was suitable for network connections of renewable energy sources is presented. Because in the solar system applications, level difference of the converter input and output voltage is high, boost converter cannot be used. Due to problems of the boost converter such as hard switching, voltage stress is equal to the output voltage. As regards in electronic converters, the power tends to increase the switching frequency to improve the converter response and increase its power density, hard switching caused to reduce converter efficiency. Also high voltage stresses of components have forced the designer to use semiconductor elements which can withstand in high voltage which will increase the losses in the converter and reduce its output. The proposed converter using LC resonant tank and auxiliary switches provides soft switching condition (ZCS) for the main converter. Interleaved techniques have used for reducing input current ripple and increase the size of the output capacitor and also boost-flyback converter have used to enhance converter gain and reduction of voltage stress of semiconductor components. The operating principle of the proposed converter is presented in this paper. Manuscript profile -
Open Access Article
43 - Design and implementation of a high step-up boost-fly back converter with soft switching
Ghasem Haghshenas Mohammad Mehdi MirtalaeeIn this paper a new soft switching boost-flyback converter is introduced to eliminate conventional boost-flyback converter problems in the high voltage applications. The main application of this converter is conction of PV system to the power system. In the proposed con MoreIn this paper a new soft switching boost-flyback converter is introduced to eliminate conventional boost-flyback converter problems in the high voltage applications. The main application of this converter is conction of PV system to the power system. In the proposed converter not only the operating duty cycles proper in high voltage gains but also the switch voltage stress is lower than output voltage. Also, in the proposed converter any auxiliary switch or magnetic core has not been used so the number of converter components has not increased much in comparison with the conventional boost-flyback converter. The operation principles of the proposed converter and its theoretical operation waveforms is presented. In order to justify the theoretical analysis, a prototype of the proposed converter is designed, simulated and experimentally implemented. The simulation and practical results are presented for a 100w boost-flyback converter with input voltage of 40V and output voltage of 400V. Manuscript profile -
Open Access Article
44 - Investigation and improvement of high step- up converters for pv module applications
Hamed moradmand jazi Ehsan Adib Bahador FaniAbstract- sun is of the clean and cheapest sources of energy. Charging slight energy to electricity is carried out by PV modules. Since most electric consumers need Ac input voltage, the PV modules output voltage should be changed into Ac form. But, the voltage level of MoreAbstract- sun is of the clean and cheapest sources of energy. Charging slight energy to electricity is carried out by PV modules. Since most electric consumers need Ac input voltage, the PV modules output voltage should be changed into Ac form. But, the voltage level of PV modules is much lower than the voltage needed in input stage of inverters. Because of large voltage level. Difference it is not possible to use the basic boost and buck-boost converters. The basic boost and buck-boost converters definitely can not be used in this applications, for, they will face extreme drop in efficiency in duty cycles closer to unity.In this paper The proposed converter is presented in order to decrease the voltage stress of coupled inductors based high step-up converters. The voltage stress in the proposed converter is lower than the high step-up boost converter with coupled inductors in identical condition. Also, soft switching condition for switches and diodes is realized by active clamp circuit, and with this technique and proper selection of duty cycle, large gain and high efficiency could be achieved ultimately. . In this paper theoretical analysis is used for analyzing the performance of the proposed converters, and in order to verify the theoretical analysis, simulated results from pspice software is provides. Manuscript profile -
Open Access Article
45 - A Duble Quasi-sinusidal Waveform Elicitation From Matrix Converter Based on Orthogonal Strategy
Alireza Siadatan Ebrahim Afjei Hadi Aghazadehthis paper has scrutinized an effective approach regarding to how to elicit double quasi-sinusoidal waveform with orthogonal angles that can be applicable for two-phase induction motors. Hither, to be more precisely declared that a switching strategy is proposed so that Morethis paper has scrutinized an effective approach regarding to how to elicit double quasi-sinusoidal waveform with orthogonal angles that can be applicable for two-phase induction motors. Hither, to be more precisely declared that a switching strategy is proposed so that the provided voltages by Matrix Converter (MC) i.e., A and B phases have 90⁰ difference with each other. This switching strategy assists two-phase induction motors aimed at operating in appropriate state. As the created frequency in an important item for this motor, matrix converter can also undertake this function. It is worth mentioning that, the switching is somehow performed until bio-directional switches couldn’t be simultaneously triggered and withal taken place in the accurate switching order. Its related circuit in order to producing appropriate current and voltage has been tested considering MATLAB Simulink and experiment. The simulation result is extracted with respect to inductive and resistive load. Meantime, PWM method is carried out to extract experimental results that clearly show its effectual performance. Manuscript profile -
Open Access Article
46 - Design and Simulation of a High Step-up Three Level Boost Converter with Coupled-Inductor and Passive Clamp
Mohsen Soltani Seyyed Mohammad Mehdi MirtalaeeRecent developments in renewable energy sources has created demands for high step-up and high efficiency DC-DC converters. This demands are fulfilled basically through the use of high frequency transformer to achieve the required and desired gain. Power electronics solu MoreRecent developments in renewable energy sources has created demands for high step-up and high efficiency DC-DC converters. This demands are fulfilled basically through the use of high frequency transformer to achieve the required and desired gain. Power electronics solutions based on multi-converter structures provides economic methods for input and output power by combining a number of components. In this paper some of structures reviewed that have been proposed to achieve a high step-up converter and the advantages and disadvantages of these converters are discussed. The proposed converter is provided in order to reduce the voltage stress of high step-up converters based on coupled inductor and passive clamping circuit. The voltage stress of switches in the proposed converter is less than a simple boost converter also in this structure with using passive clamping circuit the oscillation of both sides of the switches is a little clamped and finally by using this technique it can achieve high gain by selecting the appropriate duty cycle. In this paper to review the principle of operation of the proposed converter theoretical analysis are provided and to verify the results of theoretical analysis of the proposed converter is given with its PSPICE simulation. Manuscript profile -
Open Access Article
47 - Design and Implementation of a New Resonant Soft-Switching dc/dc Buck Converter
Arezou Nourbehesht Masoud JabbariThis paper presents a new step-down resonant dc-dc converter derived from the family of Switched-Resonator converters (SwRC). Soft-switching conditions are provided for both switches at turn on and turn off transitions by switching under zero-current (ZCS). ZCS techniqu MoreThis paper presents a new step-down resonant dc-dc converter derived from the family of Switched-Resonator converters (SwRC). Soft-switching conditions are provided for both switches at turn on and turn off transitions by switching under zero-current (ZCS). ZCS technique switching losses and enables the converter to operate at higher switching frequencies which enhances the converter power density. Moreover, it gives better efficiency with few element count and decrease the implementation cost. Due to the turning-off of the resonant diode under ZCS condition, the problem of reverse recovery which is a problematic issue especially in fast diodes is obviated. By employing a simple LC resonant network, soft-switching condition is provided for all the semi-conductor devices. The circuit is simulated by PSpice software and the results are presented. Experimental results from a laboratory prototype are also presented. Simulation and practical results confirm integrity of the presented theoretical analysis and show the full-load efficiency at 92.32%. Manuscript profile -
Open Access Article
48 - Design and Implementation of a Non-Isolated multi-Port converter with High Voltage Gain
Moein Shahsavari Sayyed Mohammad Mehdi MirtalaeiToday, solar arrays, fuel cells and wind energy are highly regarded as sources of clean energy. These sources can deliver their energy to the grid or directly to the consumer. Usually the voltage level produced in these sources is low and the need to increase the voltag MoreToday, solar arrays, fuel cells and wind energy are highly regarded as sources of clean energy. These sources can deliver their energy to the grid or directly to the consumer. Usually the voltage level produced in these sources is low and the need to increase the voltage level is. To solve this problem, high voltage gain converters can be used as single-port and multi-port. In the proposed converter to increase the voltage gain, the voltage multiplier circuit, the switched inductors and the switched capacitor are used, and also the clamp circuit is used to solve the problem of energy stored in the leakage inductor. One of the features of this converter is to share the components of the converter in different modes. This is important to reduce the number of semiconductor elements in the construction of the converter. In the proposed converter, the power transfer can be from solar array to load or from solar array to battery or both. Also, in peak moments, solar array and battery consumption can provide load power at the same time. In this paper, theoretical analysis has been used to evaluate the performance of the proposed converters and the results of the converter simulation in Orcad software have been presented to evaluate the accuracy of the theoretical analysis. Finally, a laboratory sample of the proposed converter with a power of 200 watts and a frequency of 100 kHz has been implemented, Manuscript profile -
Open Access Article
49 - A Triple-Buck Converter with Zero-Voltage Transition Base on the Interleaved Inductors
Yasin Bastan Ali Nejati Parviz AmiriA triple-buck converter with zero voltage transient is presented in this paper. The proposed structure is formed by three parallel buck converter to increase the reliability which is utilized three interleaved inductors for connecting the stages to reduce the losses cau MoreA triple-buck converter with zero voltage transient is presented in this paper. The proposed structure is formed by three parallel buck converter to increase the reliability which is utilized three interleaved inductors for connecting the stages to reduce the losses caused by hard switching. The zero voltage transistor is also performed by resonance between the parasitic capacitance of the power switches and the equivalent inductor seen from each capacitor. The proposed circuit analysis has been performed in different operating modes. The proposed Buck converter is simulated in the Matlab/Simulink environment. The simulation results prove that the switching losses as well as the loss of diodes can be reduced by zero voltage switching of the power switches and designed high-performance converter. The simulation results show that the output reaches its final value of 40 V after 0.6 ms and the output voltage variations is 0.5 V the output ripple is achieved 1.25%. Manuscript profile -
Open Access Article
50 - Boost High Step-Up DC/DC Converter with Coupled Inductors and Diode-Capacitor Technique
Mohammadmehdi Mirtalaee Rasoul Amani NafchiIn recent years, the limitations of fossil fuel resources and the environmental issues, lead to a broad research in the field of renewable energies. Among renewable energy resources, solar cells, fuel cells, and wind turbines are more dominant. Therefore, the existence MoreIn recent years, the limitations of fossil fuel resources and the environmental issues, lead to a broad research in the field of renewable energies. Among renewable energy resources, solar cells, fuel cells, and wind turbines are more dominant. Therefore, the existence of a high step-up DC-DC convertor is necessary. In this paper, we focus on DC-DC converter with high voltage gain and output power of 200 watts. The proposed converter can convert the output voltage of one or more solar cells with low voltage to higher DC voltage and suitable for the input of a DC-AC converter. In this paper, the boost converter is combined with the coupled inductors and the capacitor-diode technique. This design aims to reduce the switching loss and conductive loss to improve the performance of the converter. The performance of proposed converter evaluated by simulation results and a prototype of the proposed converter with 200 W and 50 kHz. The results from simulation and the prototype depict the performance and accuracy of the proposed converter Manuscript profile -
Open Access Article
51 - A New Step-Down DC-DC Converter with Synchronous Rectifier and Soft Switching Conditions
Rohollah Khorammi Majid Delshad Hadi SaghafiIn this paper, a high step down converter with a synchronous rectifier is presented, so that both the main switch and the rectifier switch operate under soft switching condition. Since the proposed converter gain is much lower than the conventional buck converter, it do MoreIn this paper, a high step down converter with a synchronous rectifier is presented, so that both the main switch and the rectifier switch operate under soft switching condition. Since the proposed converter gain is much lower than the conventional buck converter, it does not have the problems of these converters such as narrow duty cycle, high voltage stress and high switch current, etc. In the proposed converter, the voltage stress on the switch is reduced, so a switch with lower drain-source resistance (RDS(ON)) can be used and the conduction losses are reduced. On the other hand, because the diodes of the circuit are switched off under zero current switching condition, do not have the problem of reverse recovery. Switching losses of the switches are also greatly reduced due to operating under zero voltage switching conditions. The proposed converter has been thoroughly analyzed and a practical 120 W prototype has been made to prove the correctness of the circuit analysis. Manuscript profile -
Open Access Article
52 - Overview of DC-DC Non-Insulated Boost Converters (Structure and Improvement of Main Parameters)
Omid Sharifiyana Majid Dehghani Ghazanfar Shahgholian Sayyed Mohamad Mehdi Mirtalaee Masoud JabbariAbstract: The production of clean electricity is one of the most basic human needs today. Therefore, the use of power plants that use renewable and environmentally friendly fuels (new energy) as their base fuel, has been highly appreciated. However, the output voltage l MoreAbstract: The production of clean electricity is one of the most basic human needs today. Therefore, the use of power plants that use renewable and environmentally friendly fuels (new energy) as their base fuel, has been highly appreciated. However, the output voltage level of local power plants based on new energies is as low as the input voltage of the next floors (inverters, etc.). Therefore, researchers have tried to solve this defect by using DC / DC boost converters. The structures related to these converters are different based on the designer's expectations such as voltage gain, output power, efficiency, input voltage specifications, etc. Boost converters are responsible for increasing the DC voltage by switching and storing energy in their inductor. But the same simple structure can be created with the help of new tricks such as using magnetic coupling, adding passive incremental circuits to the converter structure, creating more complete structures by using several active switches and even combining several structures together to the desired point in terms of voltage gain. On the other hand, with soft switching methods (resonance, snubber, etc.), the efficiency of boost converters is in the acceptable range. In this paper, the types of power plants based on new energy and then boost converters, which are the most basic elements of a power plant based on new energy, it is categorized in terms of incremental structures and applied methods for optimizing these converters, especially in terms of reducing losses and increasing efficiency. Manuscript profile -
Open Access Article
53 - A New Soft Switching High Step-Up Converter Ability to Increase Parallel Branches without the Need for a New Auxiliary Circuit
Iman Es-haghpour Majid Delshad Saeid JavadiIn this paper, an interleaved high step-up converter with a simple auxiliary circuit is presented. The proposed auxiliary circuit has the coupled inductor with the input inductors of the converter and provides zero voltage switching conditions for the main switches of t MoreIn this paper, an interleaved high step-up converter with a simple auxiliary circuit is presented. The proposed auxiliary circuit has the coupled inductor with the input inductors of the converter and provides zero voltage switching conditions for the main switches of the converter. On the other hand, auxiliary switches and diodes of auxiliary circuit operate under zero current condition and therefore do not impose significant losses on the converter. The auxiliary circuit is modular and can apply to more phases of the converter. Therefore, the converter can be easily designed for very high power applications. The proposed converter uses the cross-coupled inductors technique with series lift capacitors to increase the voltage gain and reduce the voltage stress on the main switches. Also, leakage inductance energy can be easily absorbed by the clamp capacitors and helps to increasing the voltage gain. The proposed high step-up converter has been analyzed in detail and a practical prototype has been implemented at 100W. The experimental results confirm the correctness of the operation of the circuit and the theoretical analysis. Manuscript profile -
Open Access Article
54 - A New Soft Switching Interleaved Flyback Converter with Recovery Leakage Inductance Energy
Zahra Peiravan Majid Delshad Mohammadreza AminiIn this paper, a ZVS interleaved flyback converter with two transformers is presented, which consists of two active clamp flyback converters and the main switch of one converter acts as an auxiliary switch of another converter. This converter has less auxiliary elements MoreIn this paper, a ZVS interleaved flyback converter with two transformers is presented, which consists of two active clamp flyback converters and the main switch of one converter acts as an auxiliary switch of another converter. This converter has less auxiliary elements and less voltage and current stress compared to similar soft switching interleaved flyback converters. The introduction of a new auxiliary circuit for soft switching, in addition to increasing efficiency, minimizes the number of added semiconductors. Also, another advantage of this structure is the applicability of the provided auxiliary circuit to other isolated converters. The soft switching conditions in this converter are created by the auxiliary circuit in such a way that the converter switches turn on and off under ZVS conditions and the converter diodes turn on and off under ZCS conditions. The efficiency of the proposed ZVS interleaved flyback converter at full load is increased by 5%. Another advantage of the proposed converter is that the Q2 switch, in addition to providing zero voltage switching conditions for the Q1 switch, it also transmits energy and increases the density of the converter power and reduces the current stress. The converter is thoroughly analyzed and a 300W laboratory prototype is made to confirm its correct operation and practical results are presented. Manuscript profile -
Open Access Article
55 - A New Interleaved Step-Up Converter with Leakage Inductances Energy Recovery and High Efficiency
Hosein Talgini Majid Delshad Ramtin SadeghiIn this paper, a new interleaved step-up converter with leakage inductances energy recovery is presented. The auxiliary circuit in the proposed converter not only provides zero voltage switching conditions for all switches, but also the leakage inductance energy of the MoreIn this paper, a new interleaved step-up converter with leakage inductances energy recovery is presented. The auxiliary circuit in the proposed converter not only provides zero voltage switching conditions for all switches, but also the leakage inductance energy of the coupled inductors is recovered and also helps to increase the voltage gain and reduce the voltage stress of the switches. Therefore, the converter does not need passive clamp circuits to control voltage spikes on the switches. Also, all switches do not have capacitive turn-on losses in the switches. On the other hand, the output diodes operate under zero current switching and do not have the reverse recovery problem. The converter is also controlled by pulse width modulation, and since the auxiliary switches are turned on in complimentary with the main switches, they do not have a complex control circuit. The proposed converter has been completely analyzed and to confirm its correctness, a 100W sample of the converter has been made and its practical results have been presented. Manuscript profile -
Open Access Article
56 - Analysis and Design a Step-Up DC-DC Converter with Fast Dynamic Response Without the Right Half Plan Zero
Mohammad Javad Kargaran Mahdi Shaneh Tohid NouriBy increasing use of new energy to reduce the negative effects of burning fossil fuels to supply electricity, the need for power electronic converters have become very important. Due to sudden changes in load or input voltage level, the converter used as a voltage regul MoreBy increasing use of new energy to reduce the negative effects of burning fossil fuels to supply electricity, the need for power electronic converters have become very important. Due to sudden changes in load or input voltage level, the converter used as a voltage regulator in a certain range of output voltage changes should quickly return to its reference value, which should analyze the dynamic behavior of these converters and the speed of its dynamic response to any interference is discussed. Because the initial boost converter has a delay in its transfer function due to the right half plane zero, it is possible to use structures to eliminate this delay. The use of coupled inductor in non-insulated structures is one of the structures that can be repaired in this field, which in addition to removing right half plan zero of the transfer function, increases voltage gain, reduces voltage stress on circuit semiconductors. In this paper, a new coupled inductor structure is proposed to remove the right half plan zero. The new structure will be accompanied by an increase in gain, but the voltage stress on the switch is limited, and on the other hand, due to the position of the coupled inductor, the input current for this structure will be minimized. Manuscript profile -
Open Access Article
57 - Design and Simulation of Ultra-Low-Power Sigma-Delta Converter Using the Fully Differential Inverter-Based Amplifier for Digital Hearing Aids Application
Shima Alizadeh Zanjani Abumoslem Jannesari Pooya TorkzadehIn this paper, an ultra-low-power, second-order, discrete-time sigma-delta converter is proposed for hearing aids application. In portable biomedical devices such as hearing aids that permanently use, the battery lifetime and power dissipation are very considerable. In MoreIn this paper, an ultra-low-power, second-order, discrete-time sigma-delta converter is proposed for hearing aids application. In portable biomedical devices such as hearing aids that permanently use, the battery lifetime and power dissipation are very considerable. In a typical delta-sigma modulator, the OTAs are the most power-consuming parts. The OTAs elimination in the converters is now challenging. Therefore the converter with a self-biased fully differential inverter-based amplifier was designed with only 1.15 µw static power dissipation at a 1-volt power supply. The inverter-based amplifier was used instead of the OTAs in two stages of the modulator. The modulator’s structure is CIFB, single-loop, and single bit. The proposed differential modulator was designed and simulated using a standard 180 nm CMOS technology, which obtained SFDR and SNDR of 95.2878 dB and 64.004 dB, respectively. The sampling frequency is considered 2.56 MHz, and the input signal bandwidth is 10kHz. The modulator consumes power just about 5.1091 µW, and the FOMW achieves 0.197 pj/step. Manuscript profile -
Open Access Article
58 - Damping Controller Design in Offshore Wind Power Plants to Improve Power System Stability Using Fractional Order PID Controllers Based on Optimized Exchange Market Algorithm
Naser Taheri Hamed Orojlo Faramarz EbrahimiIn this paper, the design of damping supplementary controller in VSC HVDC transmission systems, which is the interface of Offshore Wind Power Plant (OWPP) with the main power system, is studied. First, it is shown that the speed-power curve in a wind turbine affects the MoreIn this paper, the design of damping supplementary controller in VSC HVDC transmission systems, which is the interface of Offshore Wind Power Plant (OWPP) with the main power system, is studied. First, it is shown that the speed-power curve in a wind turbine affects the damping of oscillation and electromechanical modes of the power system, and depending on the operating conditions of the turbine, the extent of this effect varies. Then, to improve the dynamic stability of the power system, the use of an optimized supplementary controller in the VSC HVDC system will be proposed. The proposed controller is added as an additional loop to the converter control circuits in VSC HVDC and will amplify the damping torque in the generators by correcting the damping coefficient of the system oscillation modes. In addition, a solution is provided to use the supplementary controller in the most optimal path, so that the most controllability on the oscillation modes and the least interference with other channels between the input-output signals are provided. To design the proposed controller, a fractional order PID controller will be used whose coefficients are adjusted through an optimized exchange market algorithm. The optimization of the algorithm is done by using mutation and crossover operators in the genetic algorithm with the aim of avoiding bats being trapped at local extremum. The simulation results show that the method proposed in this paper not only improves the dynamic stability of the power system but also strengthens the voltage profile. Manuscript profile -
Open Access Article
59 - Fault-Tolerant SVPWM Method for Multiple Open-Switch Faults in Six-Phase Wind Turbine Converter
Rouhollah Bolbolnia Karim AbbaszadehDue to the rapid growth of wind energy and its significant effect on the power grid, fault-tolerant in wind turbines is considered crucial to increase their reliability and availability levels. This paper presents a fault-tolerant technique for multiple open-switch faul MoreDue to the rapid growth of wind energy and its significant effect on the power grid, fault-tolerant in wind turbines is considered crucial to increase their reliability and availability levels. This paper presents a fault-tolerant technique for multiple open-switch faults in a six-phase AC-DC converter as the most vulnerable components of the wind turbine system. The proposed fault-tolerant technique uses the redundancy mode of six-phase space vectors in space vector pulse width modulation (SVPWM) and changes the switching signals in fault sectors, replacing the desired space vector with another space vector to avoid creating an undesired space vector. The main advantage of this technique is that, without adding any legs, switches, or triode for alternating currents (TRIAC) to the converter circuit, and without the need for complex calculations, the open switch faults are tolerated and the value of overcurrent and total harmonic distortion (THD) caused by the open switch faults on the healthy and faulty phases are reduced. Finally, the proposed fault-tolerant technique is evaluated by MATLAB simulation and the results of this simulation show its effectiveness. Manuscript profile -
Open Access Article
60 - A Non-Isolated High Step-Up Soft-Switching Converter with Coupled-Inductor
Jalil Jalili Sayyed Mohammad Mehdi Mirtalaei Mohamad Reza Mohammadi Behrooz MajidiIn this paper, a non-isolated high step-up soft-switching converter is proposed. The proposed converter is a boost converter combined with two voltage multiplier cells for boosting output voltage. Also, extend voltage gain of the proposed converter is achieved by using MoreIn this paper, a non-isolated high step-up soft-switching converter is proposed. The proposed converter is a boost converter combined with two voltage multiplier cells for boosting output voltage. Also, extend voltage gain of the proposed converter is achieved by using a coupled-inductor. Compare with other similar high step-up topologies with the same number of components, the proposed converter has a higher voltage gain and higher efficiency. An active clamp circuit is used so, the zero-voltage switching (ZVS) is achieved. Also, in the proposed converter, the voltage stresses on the switches are low. As the voltage stress decreases on the switch, Ron of the MOSFET is deceased and as a result conduction loss of the switch is decreased. So, the efficiency of this converter increased. In this paper, operational principle of the converter is described and the analytical, simulated results and prototype converters are validated using a 20V input and 400V output converter at 200W load. Manuscript profile -
Open Access Article
61 - A Novel Approach for Comprehensive State-space Modeling of the Multilevel Grid Connected Inverters
Hassan Manafi Miralilu Mahdi Salimi Jafar Soltani Adel AkbarimajdIn this paper, a novel approach for comprehensive state-space modelling of the grid connected multi-level inverters is proposed. Details of the developed method is presented using cascaded H-bridge converters, however it can be applied to other topologies of the grid co MoreIn this paper, a novel approach for comprehensive state-space modelling of the grid connected multi-level inverters is proposed. Details of the developed method is presented using cascaded H-bridge converters, however it can be applied to other topologies of the grid connected inverters as well. In multi-level converters, due to their nonlinear characteristic, application of the nonlinear controllers is more beneficial to ensure stability of the system in a wide range of operation. Hence, the state-space model is required to design a nonlinear controller. To achieve converter model, it is divided into some sub-circuits considering different operational intervals in a switching cycle. To verify accuracy and effectiveness of the obtained state-space model, a laboratory setup of a multi-level. Converter with two H-bridges has been designed and implemented. Also, results of the developed state-space model has been compared with the simulation/experimental results of the grid-connected converter. According to the simulation and experimental result, accuracy of the model is verified. It should be noted that all of the simulations have been performed by EMTDC/PSCAD toolbox. Manuscript profile -
Open Access Article
62 - Soft Switching Interleaved Boost Converter with Simple Auxiliary Circuit and Reduced Voltage Stress
Omid Haghparast Naeini Mahdi Shaneh Mohamad Reza MohammadiThe interleaved boost converters are the power circuits that provide high-voltage, high-power with regulated output voltage for renewable energy systems which are generally suffer from low-voltage and unregulated output voltages. The soft switching methods reduce electr MoreThe interleaved boost converters are the power circuits that provide high-voltage, high-power with regulated output voltage for renewable energy systems which are generally suffer from low-voltage and unregulated output voltages. The soft switching methods reduce electromagnetic noises and switching losses in these converters. In this paper, a ZVT interleaved boost converter with a simple auxiliary circuit is proposed. The proposed converter has a simple structure with low size and cost. In the proposed converter, soft switching condition is provided without any extra voltage and current stress on the main switches. The auxiliary circuit comprises two diodes and one auxiliary switch. The leakage inductance of the utilized coupled inductors is used as resonant inductor. The auxiliary switches benefit from significantly reduced voltage stress without requiring floating gate driver. The proposed converter can achieve zero voltage switching operation for the main switches and zero current switching for diodes and auxiliary switches, which causes to alleviate the reverse recovery problems of all diodes. Manuscript profile -
Open Access Article
63 - Design and implement of a high step-up boost converter with voltage multiplier
Sadegh Heidari Beni Mohammad Mehdi MirtalaeeBecause the traditional fossil energy is not renewable modern societies, are facing energy shortages. As a result, it is necessary to develop new energy that is clean and renewable to replace of fossil fuels. Solar energy, photovoltaic power generation, fuel cell and hy MoreBecause the traditional fossil energy is not renewable modern societies, are facing energy shortages. As a result, it is necessary to develop new energy that is clean and renewable to replace of fossil fuels. Solar energy, photovoltaic power generation, fuel cell and hydrogen energy are methods used to big - scale energy sources.In a mono - phase system with two - step structure if the line voltage is 220 volts, bus inverter voltage that connected to network, should be about 380 volts. However, the output voltage of the photovoltaic cells and fuel cells are generally between 25 to 40 volts this voltage is much lower than the bus voltage. So a high efficiency DC-DC converter output voltage is required to boost fuel cells and photovoltaic cells. In this research, will be presented an improved structure as high efficiency voltage boost converter with a voltage multiplier circuit for solar cell applications. In the proposed structure for efficiency improvement, used voltage multiplier circuit techniques and coupled inductors. We have the proposed converter using the active clamp circuit to achieve soft switching conditions and reduce switching losses. generally, the advantages of the proposed converter are high step-up voltage and high efficiency, low voltage stress for switches and diodes, providing soft switching conditions, and ultimately reducing the number of magnetic elements and the circuit's size. In this paper, in addition to describing the operation of the circuit and provide theoretical analyzes, validity of circuit performance will be evaluated through simulation software Manuscript profile -
Open Access Article
64 - Design and Analysis of a New Structure for Non-Isolated DC-DC Boost Converters
Massoud Emamdad Ehsan Akbari Shima Karbasi Abbas Zare Ghaleh SeyyediFollowing the scarcity of non-renewable resources such as oil, gas and coal, more research is focused on the issue of high energy consumption and society's dependence on fossil fuels. The use of renewable energy and the development of microgrids can be necessary to redu MoreFollowing the scarcity of non-renewable resources such as oil, gas and coal, more research is focused on the issue of high energy consumption and society's dependence on fossil fuels. The use of renewable energy and the development of microgrids can be necessary to reduce dependence on fossil fuels. Photovoltaic systems play a key role in microgrids as a source of renewable energy supply. In these systems, the output voltage of the cell is usually much lower than the voltage required by the DC bus, and as the output current increases, the amount of this voltage decreases significantly. Therefore, the presence of a step-up DC-DC converter with a wide input voltage range is necessary to connect the low-voltage cell source and the high-voltage DC bus connected to the inverter. In this paper, a new structure is presented for non-insulated DC-DC boost converters based on voltage lift technique. The proposed converter has a proper voltage gain at output and an acceptable voltage stress on switch and diodes in comparison with recent references. The proposed converter has a switch with easier control and high reliability due to the input source common point and the output load of the converter. Analysis of the voltage stress as well as selection of suitable elements along with converter analysis in continuous mode are performed and calculation validity is confirmed by presented laboratory results. Manuscript profile -
Open Access Article
65 - Design and Implementation of Soft Switching Three-port High Step-Up DC-DC Converter for Solar Energy Applications
Somaye Gashtasebi Fariborz Haghighatdar Fesharaki Seyed Mohammad Mehdi MirtalaeiIn recent few decades, due to various reasons, including energy crisis and environmental problems, renewable energy sources such as wind energy, solar systems and fuel cells have received much attention. Solar or photovoltaic systems are one of the most widely used rene MoreIn recent few decades, due to various reasons, including energy crisis and environmental problems, renewable energy sources such as wind energy, solar systems and fuel cells have received much attention. Solar or photovoltaic systems are one of the most widely used renewable energy sources that have a low output voltage. For this reason, research on dc-dc converters has increased in recent years. In this paper, a non-isolated high voltage gain converter with three input-output ports is proposed. This converter provides two separate paths for power flow from each input source to the output load. In order to reduce the number of converter components, some components play multiple roles. Therefore, the energy storage device (battery) will charge with the same components used to transfer the power to the load. In this converter, to increase the voltage gain, the coupled inductor technique is used. Moreover, to reduce the leakage inductance as well as achieving the soft switching condition, two active clamps are used. Since the voltage across the switches is limited, the switches can be used with low voltage stress and thus low conduction losses. In this converter, the ripple of the input current will reduce by adding an inductor at its input. This has a significant impact on the performance and the lifespan of the solar cells. The various operational modes of the converter are discussed and the designing considerations are presented. A prototype of the proposed converter is simulated to supply a 130 W, 330 V load with a switching frequency of 50 kHz, in OrCAD software. Finally, a laboratory sample is implemented and the theoretical analysis are validated by the practical results. Manuscript profile -
Open Access Article
66 - Switching Circuit Designing for High-Power Synchronous Buck Converters: An Experimental Approach
Mazdak Ebadi Mohammad Amin Bahramian Ali Asghar GhadimiNon-isolated buck converters are well-known solutions for producing controllable DC voltage at medium and high-power levels. Meanwhile, synchronous converters have received a lot of attention due to the non-dependence of the voltage conversion ratio on the load and the MoreNon-isolated buck converters are well-known solutions for producing controllable DC voltage at medium and high-power levels. Meanwhile, synchronous converters have received a lot of attention due to the non-dependence of the voltage conversion ratio on the load and the continuity of the inductor current. But the switching of these converters takes place at higher power levels at lower frequencies. For this reason, the switching circuit must work with a higher dead time. In this article, an analog application circuit design without the use of a microcontroller is presented for the switching of the synchronous buck converter, which, while ensuring that pulses are not sent to the keys at the same time, the amount of dead time can be It provides a setting that can be changed according to the voltage level and current of the circuit. After analyzing the conditions at the moment of switching on and off of the circuit, it was found that at the moment of switching off, a destructive transient current is applied to the keys, which this article solves this issue by using two fast SSR relays in the path of the input signal to the gate module. The driver suggests that it has been tested on a prototype device. This article also mentions the requirements of the switching circuit by analyzing the conditions of the moment when the circuit is turned on and off, so that the transient damaging current does not pass through the IGBT. The results of experimental tests on a 15 kW synchronous buck DC/DC converter with an output of 300 V 50 amps show that the well-designed switching circuit creates an adjustable dead time of up to 6 microseconds in the switching of this converter and the continuity conditions It has provided the inductor current both in no load and under load. Also, the proposed method has well removed the transients of the circuit turning on and off. Manuscript profile -
Open Access Article
67 - A New Zero Voltage Transition Quadratic High Step-Up Converter with Leakage Inductance Energy Recovery for Photovoltaic Applications
Alireza Abdelahi Majid Delshad Ramtin SadeghiIn this paper, a high step-up converter with leakage inductance energy recovery and zero voltage switching operation for both switches is presented. The auxiliary circuit not only uses the leakage inductance energy to increase voltage gain but also reduces switching and MoreIn this paper, a high step-up converter with leakage inductance energy recovery and zero voltage switching operation for both switches is presented. The auxiliary circuit not only uses the leakage inductance energy to increase voltage gain but also reduces switching and conduction losses of the semiconductor devices. The auxiliary circuit has only one snubber capacitor and one auxiliary switch, and the circuit capacitors are used as clamp capacitors. The low voltage stress of the switches makes it possible to use cheaper switches with more minor drain-source resistance. Also, the lifting voltage capacitor absorbs the leakage inductance energy. Due to zero voltage switching of switches, there are no capacitive turn-on losses, and due to switching off the diodes at zero-current conditions, the reverse recovery problem is solved in them, so the conduction losses of the converter are significantly reduced. On the other hand, the ripple input current in the converter has been dramatically reduced, which makes it very suitable for use in photovoltaic systems. The converter is implemented at 200 W and 350V output and the practical results confirm the theoretical analyzes. Manuscript profile -
Open Access Article
68 - Modeling of Pulsed Transformer with Nanocrystalline Cores
Amir Baktash Abolfazl VahediRecently tape wound cores, due to their excellent properties, are widely used in transformers for pulsed or high frequency applications. The spiral structure of these cores affects the flux distribution inside the core and causes complication of the magnetic analysis an MoreRecently tape wound cores, due to their excellent properties, are widely used in transformers for pulsed or high frequency applications. The spiral structure of these cores affects the flux distribution inside the core and causes complication of the magnetic analysis and consequently the circuit analysis. In this paper, a model based on reluctance networks method is used to analyze the magnetic flux in toroidal wound cores and losses calculation. A Preisach based hysteresis model is included in the model to consider the nonlinear characteristic of the core. Magnetic losses are calculated by having the flux density in different points of the core and using the hysteresis model. A transformer for using in a series resonant converter is modeled and implemented. The modeling results are compared with experimental measurements and FEM results to evaluate the validity of the model. Comparisons show the accuracy of the model besides its simplicity and fast convergence. Manuscript profile -
Open Access Article
69 - Design and Implementation of a New Current Fed Converter With Zero Current Switching Conditions
Bahador Fani Majid DelshadIn this paper a new soft switching current-fed converter for high voltage high power applications is presented. This converter utilizes parasitic components of high voltage transformers as resonant elements and employs fixed frequency phase shift PWM control to implemen MoreIn this paper a new soft switching current-fed converter for high voltage high power applications is presented. This converter utilizes parasitic components of high voltage transformers as resonant elements and employs fixed frequency phase shift PWM control to implement soft switching condition, so the implementation of control circuit is easy and cheap. Every six switches turn on at zero current condition (ZCS) and it has high efficiency. The detailed steady state analysis of the converter is presented by computer simulation and analytical method. Finally the experimental results certificate analysis and simulation results of this converter. Manuscript profile -
Open Access Article
70 - A New ZVS Nonisolated Bidirectional DC-DC Converter with Minimal Auxiliary Element
Nasrin Asadi Madiseh Majid DelshadIn this paper, a new nonisolated bidirectional buck–boost dc–dc converter is introduced. The proposed converter can be operated under ZVS condition and fixed switching frequency regardless of the direction of power flow. To provide ZVS condition for switches MoreIn this paper, a new nonisolated bidirectional buck–boost dc–dc converter is introduced. The proposed converter can be operated under ZVS condition and fixed switching frequency regardless of the direction of power flow. To provide ZVS condition for switches a simple auxiliary circuit is used, that consists of an auxiliary inductor and a coupled winding to main inductor. Due to ZVS operation of switches, the reverse recovery problem of the body diode of the switches does not occur. Moreover, to provide soft switching any extra switch is not used in this converter, so its implementation and control is very simple. The experimental and simulation results of the proposed bidirectional converter are given to confirm the theoretical analysis. Manuscript profile -
Open Access Article
71 - Speed Control of Induction Machine Based on Matrix Converter with Unbalanced Input Voltage
Malek Mohammadrezaei Gholam Reza Arab Arash Daghighi Jafar SoltaniMatrix Converter (MC) is a direct energy conversion device with high input power factor. As a device without dc link elements, its output characteristic and reliability can be degraded by ac line side disturbances. This has attracted many researchers to make efforts to MoreMatrix Converter (MC) is a direct energy conversion device with high input power factor. As a device without dc link elements, its output characteristic and reliability can be degraded by ac line side disturbances. This has attracted many researchers to make efforts to solve this problem. In this paper, under unbalanced input voltage conditions, behaviors of the MC controlled with Venturini method are analyzed. The output voltage is estimated and a PI controller compensation method to prevent negative effects of the input voltage harmonics is proposed. Using this technique, output harmonic contents are reduced and stable control of the load voltages and currents is ensured. The MC is used for fed induction motor that reference voltage for converter is computed with controller based on input-output feed-back linearization. Simulation results are presented in the paper to verify effectiveness of the approach. Manuscript profile -
Open Access Article
72 - Design and Implementation of a High Step-Up Boost-Sepic Hybrid Converter with Soft Switching
Sayyed Mohammad Mehdi Mirtalaei Mahnaz Mohtaj Hamid Reza KaramiIn this paper a compound boost- sepic converter with soft switching for high voltage application is proposed. One of the advantages of this converter is that, the main switch is turned on under the ZCS condition without need to any auxiliary switch so we have lower swit MoreIn this paper a compound boost- sepic converter with soft switching for high voltage application is proposed. One of the advantages of this converter is that, the main switch is turned on under the ZCS condition without need to any auxiliary switch so we have lower switching loss. In order to increase the voltage gain in this topology, a boost converter used in series with the output stage of sepic converter, therefore the output voltage of boost converter added to the output voltage of sepic converter and the voltage gain has been increased. Also a coupled inductor has been used in the boost converter topology which leads to a further increase in the voltage gain of the converter. In order to evaluate the operation of the proposed converter, simulation results and analysis of converter operational modes are presented. In addition, experimental results are presented for a typical boost-sepic converter. These results verify the proper operation of proposed converter. Manuscript profile -
Open Access Article
73 - Conducted EMI Evaluation and Reduction in a Forward Switching Converter
Mohammad Rouhollah Yazdani Nahid Amini FilabadiIn switching power converters, electromagnetic interference (EMI) is produced due to the fast changes of the voltage and current. Among switching topologies used in low and medium powers, forward converter is vastly employed which needs resetting transformer core. In th MoreIn switching power converters, electromagnetic interference (EMI) is produced due to the fast changes of the voltage and current. Among switching topologies used in low and medium powers, forward converter is vastly employed which needs resetting transformer core. In this paper, a forward converter with reset winding is modeled to predict conducted EMI. To evaluate the EMI model, EMI measurement results are presented. To select an optimum reset scheme from EMI viewpoint, three reset techniques are compared using experimental results. After selecting the proper reset scheme, two EMI mitigation methods are proposed and the practical EMI reduction is presented. Manuscript profile -
Open Access Article
74 - A New Hard Switching Bidirectional Converter With High Power Density
Bahador Fani Majid Delshad Daryoosh NazarpourIn this paper, a new isolated dc-dc bidirectional converter is proposed. This converter consists of two transformers (flyback and forward) and only one switch in primary side and one switch in secondary side of transformers. In this converter energy transfers to the out MoreIn this paper, a new isolated dc-dc bidirectional converter is proposed. This converter consists of two transformers (flyback and forward) and only one switch in primary side and one switch in secondary side of transformers. In this converter energy transfers to the output in both on and off switch states so power density of this converter is high This converter controlled by PWM signal. Also this converter operates over a wide input voltage range. Theoretical analysis is presented and computer simulation and experimental results verify the converter analysis. Manuscript profile -
Open Access Article
75 - Condenser microphone with small size and high sensitivity Using a circular diaphragm with fixed center
Nastaran Nademi Javad KaramdelIn this paper, a new single-chip MEMS capacitor microphone on a silicon wafer by minimizing the size and the reduction of mechanical strength using a circular diaphragm with a fixed center is proposed. In the proposed microphone, the diaphragm includes a number of holes MoreIn this paper, a new single-chip MEMS capacitor microphone on a silicon wafer by minimizing the size and the reduction of mechanical strength using a circular diaphragm with a fixed center is proposed. In the proposed microphone, the diaphragm includes a number of holes to pass the air through the gap between the back plate and diaphragm, and thus reduces the damping of the sound from the microphone. Novelty of this method, creating a circular microphone with fixed center, which the diameter of diaphragm is less than the conventional condenser microphone. At first, the mechanical analysis was conducted on microphone diaphragm in order to achieve the pull-in voltage. The pull-in voltage of the proposed circular microphone is 14 volts. According to the obtained pull-in voltage, the bias voltage were applied to the microphone, and various parameters such as capacitance and sensitivity were measured. Based on the simulation results of COMSOL, the proposed microphone with diaphragm diameter of 400 μm and a thickness of 1.5 μm, the sensitivity of -23 dB is shown. In comparison with previous works, the proposed microphone with lower supply voltage is provided the better frequency performance, and higher sensitivity, in order to sense the sound. Manuscript profile -
Open Access Article
76 - Design and Implementation of Half-Bridge LLC Resonant Converter by FHA Technique
Navid Salehi Majid DehghaniAlthough in existence for many years, only recently has the LLC resonant converters, in particular in its half-bridge implementation, gained in the popularity it certainly deserve. The advantages such as high efficiency, low level of EMI emissions, and its ability to ac MoreAlthough in existence for many years, only recently has the LLC resonant converters, in particular in its half-bridge implementation, gained in the popularity it certainly deserve. The advantages such as high efficiency, low level of EMI emissions, and its ability to achieve high power density are such features that suited for power supply demand of many modern applications such as ATX PCs and flat panel TVs. One of the major difficulties in concern with designing such converter is complex model and non-linear equations that cannot be easily used into a design procedure. So in this paper, design is based on the assumption that input-to-output power transfer is essentially due to the fundamental Fourier series components of currents and voltages. This technique known as First Harmonic Approximation (FHA) and is a proper method to obtain the voltage gain through solving the equivalent ac circuit of the resonant tank. The design simulated by Pspice and finally the experimental results show design procedure base on FHA technique. Manuscript profile -
Open Access Article
77 - Steady State Analysis of LCLC Resonant Converter with Capacitive Output Filter
Navid Shafiyi Hosein Farzanehfard Mehrdad JafarbolandThis paper presents the mathematical analysis and modeling of a 4th order LCLC resonant converter with capacitive output filter in steady-state condition. Due to the nonlinearity of the LCLC resonant circuit with capacitive output filter, the conventional modeling proce MoreThis paper presents the mathematical analysis and modeling of a 4th order LCLC resonant converter with capacitive output filter in steady-state condition. Due to the nonlinearity of the LCLC resonant circuit with capacitive output filter, the conventional modeling procedure cannot thoroughly describe the behavior of the converter. In this paper, a mathematical model is proposed that can accommodate the absence of the output inductor and predict the converter performance for a wide range of operating conditions. A 2.25KW prototype converter is provided to evaluate the accuracy of the proposed model. Experimental results show that the proposed model can precisely predict the behavior of the converter for a wide range of operating conditions. Manuscript profile -
Open Access Article
78 - Assesment and Analyze Hybride Control System in Distribution Static Synchronous Compensator Based Current Source Converter
Sayed Mohammad Ali Zanjani Zahra Azimi Mostafa AzimiWith the rapid technology advancement in control processes, electric utilities are experiencing more demanding requirements on the power quality from the large industrial power consumers. For achieved this purpose use of FACTS devices. One of kind compensator is D-Statc MoreWith the rapid technology advancement in control processes, electric utilities are experiencing more demanding requirements on the power quality from the large industrial power consumers. For achieved this purpose use of FACTS devices. One of kind compensator is D-Statcom, using in distribution system for conquest of power quality problem. This paper presents system modeling and control design techniques of distribution static synchronous compensator. For reach an optimal design, using a hybride state-feedback and d-q control systems. Using direct sampling on network parameter, than conventional control system, as well as fast dynamic responses are achieved. The derived simulations are tried to verify the result of this paper. Manuscript profile -
Open Access Article
79 - Simulation and Implementation a Non-Isolated Buck Converter at ZCS Condition
Nahid Hematian Masoud JabbariA new soft-switching resonant inverting-buck converter with high efficiency is presented. The proposed converter steps down and inverts the input voltage. The zero-current-switching (ZCS) technique is employed to reduce switching losses and Electromagnetic Interferences MoreA new soft-switching resonant inverting-buck converter with high efficiency is presented. The proposed converter steps down and inverts the input voltage. The zero-current-switching (ZCS) technique is employed to reduce switching losses and Electromagnetic Interferences (EMI). An LLC resonant network is utilized to provide soft-switching conditions for all semiconductor devices. Experimental results verify the integrity of the proposed converter operation and the presented theoretical analysis. Manuscript profile -
Open Access Article
80 - Common-Mode EMI Reduction in Switching Flyback Power Supply by Implementing Cancellation Method of Heat-Sink Capacitor
Mohammad Rouhollah Yazdani Maryam FazelElectromagnetic compatibility in switching power converters which are noise sources themselves, has a special importance. Electromagnetic interference (EMI) in the form of conducted or radiated reaches to sensitive sections and interferes with their operation. On the ot MoreElectromagnetic compatibility in switching power converters which are noise sources themselves, has a special importance. Electromagnetic interference (EMI) in the form of conducted or radiated reaches to sensitive sections and interferes with their operation. On the other, electromagnetic compatibility (EMC) standards causes another forces to reduce noise in switching converters. Major part of noise is due to the common-mode (CM) current passes through parasitic elements to the circuit ground (Earth). One of the important parasitic elements from the CM noise viewpoint is the switch heat-sink capacitor (common-mode capacitor). In this paper, a cancellation method of the heat-sink capacitor via a passive circuit is proposed in a 50W isolated flyback converter and is also modeled in OrCAD software. Also, experimental measurement results of the CM electromagnetic interference in regular and proposed flyback converter prototypes are presented to examine the modeling accuracy. Based on the experimental results, significant reduction of CM-EMI is verified after applying the cancellation method of the heat-sink capacitor. Manuscript profile -
Open Access Article
81 - Efficient Reverse Converter for Three Modules Set {2^n-1,2^(n+1)-1,2^n} in Multi-Part RNS
Shiva TaghipourEivazi -
Open Access Article
82 - New Application of Active Power Filters in a Microgrid
Mohammad Firoozian Seyed Hossein Hosseinian Mehrdad Abedi -
Open Access Article
83 - Low Complexity Converter for the Moduli Set {2^n+1,2^n-1,2^n} in Two-Part Residue Number System
Shiva Taghipour -
Open Access Article
84 - Sliding Mode Controller Design for DC-DC Quasi-Z-Source Converter
Navid Vahidfar Mohammad Hosein Ershadi -
Open Access Article
85 - Regulating the Output Voltage of Buck-Boost Converters Using General Type2 Fuzzy Controller
Hamid Reza Ghorbani Reihaneh Kardehi Moghaddam S. Ehsan Razavi -
Open Access Article
86 - A Wide-Range-Gain Switched-Coupled-Inductor Buck-Boost ZETA Converter
Mustafa Okati mahdiyeh Eslami Mehdi Jafari Shahbazadeh -
Open Access Article
87 - Robust Combined Control of Proton Exchange Membrane Fuel Cell Equipped by Boost Converter
Hassan Khosh Kholgh Sima Alireza Sahab Abdolreza Tavakoli Hossein Mahdinia Roudsari -
Open Access Article
88 - Improving the Voltage Profile of the Power System Using PV-STATCOM
Navid Ghardash khani Ali Mastanabadi -
Open Access Article
89 - A New Control Method for Smoothing PMSG-based Offshore Wind Farm Output Power
Navid Ghardash khani -
Open Access Article
90 - Tuning of Fuzzy Logic Controller Using an Improved Black Hole Algorithm for Maximizing Power Capture of Ocean Wave Energy Converters
Reihane Kardehi Moghaddam Mohamad Jalali Naser Pariz -
Open Access Article
91 - Intelligent Model Based Predicative Controller for DC-DC Converter in Photovoltaic Systems
Hadi Saghafi Amin Rasoulian Mohammadali Abbasian Majid Delshad -
Open Access Article
92 - Application of TRIZ Thinking Method to Unified Power Flow Controllers by Converting into DPFC and FSO-DPFC
Arash Hakimy Javad Faiz Ghazanfar ShahgholianThis paper introduces an innovative and creative systematic thinking method based on TRIZ thinking technique which can improve the performance of unified power flow controllers (UPFC). This new device is called distributed power flow controller (DPFC). The difference be MoreThis paper introduces an innovative and creative systematic thinking method based on TRIZ thinking technique which can improve the performance of unified power flow controllers (UPFC). This new device is called distributed power flow controller (DPFC). The difference between UPFC and DPFC lies in exchanging three-phase series converter with single-phase converters that are distributed along the transmission line. This is based on one of the 40 principles of TRIZ innovative thinking technique, called segmentation. The basic changes, occurring in the DPFC, compared to UPFC are eliminating common DC-link between the series and shunt converters, and replacing three-phase series converters with single-phase series converter. These changes, lead to more economic and more reliable system. Similar to UPFC, the DPFC adjusts line impedance, transmission angle and bus voltage simultaneously. The DPFC design procedure based on differences with UPFC is described and DPFC advantages in mitigation of transmission line voltage sag and fluctuation are shown; while in some cases, simulation results of using UPFCs, DSTATCOM, TCSC and SVC indicate voltage sags. Finally, this paper introduceس one innovatively DPFC called fuzzy self-organized DPFC (FSO-DPFC) to solve the most important problem of DPFC. DPFC series converter with and without FSO controller (FSO-DPFC) are simulated. The simulation results of using FSO-DPFC, compared to traditional DPFC, shows more system ability to mitigate disturbances in the central controller signals. Manuscript profile -
Open Access Article
93 - A Brief Overview of the Application of Unified Power Flow Controller in Power Systems
Mehdi Riahinasab Majid Dehghani Arman Fathollahi Mohammad Reza Behzadfar -
Open Access Article
94 - Power Frequency Control of the Grid using PMSG-Based Wind Farm Connected by HVDC Link Controlled by a New Method Based on Fuzzy Logic Controller
Ali Mastanabadi Gholamreza Aghajani Davar Mirabbasi -
Open Access Article
95 - Investigate and Improve the Reliability of Small Size Wind Energy Conversion Systems Connected to the Network
Omid Feizollahzade -
Open Access Article
96 - Two New and Novel Cascaded Multilevel Inverters with Less Number of Components Utilizing Series Submultilevel Inverters
K. Rahimi A. Salemnia S.E. Afjei -
Open Access Article
97 - New Strategy of Grid Connected Photovoltaic System Using Module Integrated Converters with B4 Inverter to Overcome Partial Shading Effect
Reza Rezaii Mohammad Amin Abolhasani Ali Yazdian Varjani Reza Beiranvand -
Open Access Article
98 - Design and Simulation of a 100 kVA Intelligent Universal Transformer Enjoying the Voltage Ratio of 20kv:380v
V. Gholamrezaie M. Ghazavi Dozein S.M. Abasi M. Oskuoee -
Open Access Article
99 - Design of Maximum Power Point Tracking in Solar Array Systems Using Fuzzy Controllers
Marjaneh Hashemi Shahram Javadi -
Open Access Article
100 - SLIDING MODE CONTROL BASED ON FRACTIONAL ORDER CALCULUS FOR DC-DC CONVERTERS
Noureddine Bouarroudj D. Boukhetala B. Benlahbib B. Batoun -
Open Access Article
101 - A New Ultra High-Gain DC/DC Converter with Full Soft-Switching Performance and Low Voltage Stress
Sara Hasanpour Amard Afzalian Tohid NouriThis paper presents a new single-switch Ultra High-Gain DC/DC converter for renewable energy applications. This converter is able to provide a high voltage gain in a low-duty cycle, low input current ripple, and low voltage stress. Moreover, a coupled inductor with thre MoreThis paper presents a new single-switch Ultra High-Gain DC/DC converter for renewable energy applications. This converter is able to provide a high voltage gain in a low-duty cycle, low input current ripple, and low voltage stress. Moreover, a coupled inductor with three windings is utilized to extend the voltage gain, which indicates more converter flexibility. Also, the secondary winding of the coupled inductor acts in a trans-inverse manner. Thus, at a lower number of turn ratios, higher voltage gains can be achieved. A regenerative passive clamp circuit absorbs and recycles the energy of the leakage energy of the coupled inductor. The single-power MOSFET operates at zero current switching conditions with restricted voltage stress. In this circuit, because of the soft-switching operation for the power switch and diodes, the power dissipations have been alleviated considerably. Detailed steady-state and power loss analyses, as well as design considerations, are provided. Finally, to confirm the given theories a sample prototype (200 W, 25 V- 400 V) is implemented. Regarding the experimental results, the proposed converter efficiency is about 96.2%, and the maximum voltage stress across the power switch is limited to about 15% output DC voltage. Manuscript profile
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