List of Articles Sayyed Mohammad Mehdi Mirtalaei

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  1 - Analysis of a High Step-up Boost-Flyback Converter for Solar Energy Applications
  Mohammad mehdi Mirtalaee Razieh Jaberi
  20.1001.1.23223871.1397.9.34.3.4
  In 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 More

  In 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
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  2 - Design and implementation of a high step-up boost-fly back converter with soft switching
  Ghasem Haghshenas Mohammad Mehdi Mirtalaee
  20.1001.1.23223871.1395.7.28.2.7
  In 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 More

  In 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
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  3 - Design and Simulation of a High Step-up Three Level Boost Converter with Coupled-Inductor and Passive Clamp
  Mohsen Soltani Seyyed Mohammad Mehdi Mirtalaee
  20.1001.1.23223871.1396.8.32.1.1
  Recent 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 More

  Recent 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
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  4 - Design and Implementation of a Non-Isolated multi-Port converter with High Voltage Gain
  Moein Shahsavari Sayyed Mohammad Mehdi Mirtalaei
  20.1001.1.23223871.1400.12.2.3.1
  Today, 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 More

  Today, 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
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  5 - Boost High Step-Up DC/DC Converter with Coupled Inductors and Diode-Capacitor Technique
  Mohammadmehdi Mirtalaee Rasoul Amani Nafchi
  20.1001.1.23223871.1398.10.39.1.9
  In 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 More

  In 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
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  6 - 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 Jabbari
  20.1001.1.23223871.1400.12.48.6.6
  Abstract: 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 More

  Abstract: 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
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  7 - A Non-Isolated High Step-Up Soft-Switching Converter with Coupled-Inductor
  Jalil Jalili Sayyed Mohammad Mehdi Mirtalaei Mohamad Reza Mohammadi Behrooz Majidi
  20.1001.1.23223871.1403.15.57.1.0
  In 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 More

  In 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
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  8 - Design and implement of a high step-up boost converter with voltage multiplier
  Sadegh Heidari Beni Mohammad Mehdi Mirtalaee
  20.1001.1.23223871.1397.9.33.2.1
  Because 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 More

  Because 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
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  9 - 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 Mirtalaei
  20.1001.1.23223871.1403.15.59.7.0
  In 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 More

  In 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
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  10 - Design and Implementation of a High Step-Up Boost-Sepic Hybrid Converter with Soft Switching
  Sayyed Mohammad Mehdi Mirtalaei Mahnaz Mohtaj Hamid Reza Karami
  20.1001.1.23223871.1394.6.24.3.3
  In 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 More

  In 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