Averaged Small Signal Model of a Push-Pull Converter with Parasitic Elements in Continuous Mode
محورهای موضوعی : Electrical EngineeringAtila Eskandarnezhad 1 , Noruz Abdollahi 2
1 - Department of Electrical Engineering, Aliabad Katoul Branch, Islamic Azad University, AliabadKatoul, Iran.
2 - Department of Electrical Engineering, Aliabad KatoulBranch, Islamic Azad University, Aliabad Katoul, Iran
کلید واژه: Push-pullconverter, Small signal model, Averaging Technique, Continuous mode,
چکیده مقاله :
This paper presents the small-signal modeling of a modified push-pull converter using averaged circuit method. Parasitic elements are considered to increase the accuracy of the proposed technique. In the design process of converters it is desirable to assess as many critical design parameters and parasitic effects by simulation as possible, since the control is hard to tune after fabrication. The low frequency small-signal model is done using state space averaging technique and two main power-stage transfer functions are derived, which are control-to-output voltage transfer function and input-to-output voltage transfer function. Using the proposed model of the converter we can analyze and simulate the time domain transient behavior of the system accurately and intuitively. The resulting model is a time averaged equivalent circuit model where all branch currents and node voltages correspond to their averaged values of the corresponding original currents and voltages. The model is applicable to both current and voltage mode control. The model has the principle advantage that it is simple to derive and it takes the same form as the switching converter that it is derived from. In the model, the MOSFET switches are replaced by dependent current and voltage sources equal to the average current through the switch, or average voltage across the switch. The validity of the proposed model was verified by simulation and experimental results for a specified design example. The method of modelling presented here helps to design the inverter effectively and better choosing the controller component values.
This paper presents the small-signal modeling of a modified push-pull converter using averaged circuit method. Parasitic elements are considered to increase the accuracy of the proposed technique. In the design process of converters it is desirable to assess as many critical design parameters and parasitic effects by simulation as possible, since the control is hard to tune after fabrication. The low frequency small-signal model is done using state space averaging technique and two main power-stage transfer functions are derived, which are control-to-output voltage transfer function and input-to-output voltage transfer function. Using the proposed model of the converter we can analyze and simulate the time domain transient behavior of the system accurately and intuitively. The resulting model is a time averaged equivalent circuit model where all branch currents and node voltages correspond to their averaged values of the corresponding original currents and voltages. The model is applicable to both current and voltage mode control. The model has the principle advantage that it is simple to derive and it takes the same form as the switching converter that it is derived from. In the model, the MOSFET switches are replaced by dependent current and voltage sources equal to the average current through the switch, or average voltage across the switch. The validity of the proposed model was verified by simulation and experimental results for a specified design example. The method of modelling presented here helps to design the inverter effectively and better choosing the controller component values.
[1] B.J. Patella, A. Prodic, A. Zirger and D. Maksimovic, "High-frequency digital PWM controller IC for DC-DC converters", Power Electronics, vol. 18, pp. 438-446, 2003.
[2] R.J. Wai and R.Y. Duan, "High efficiency DC/DC converter with voltage gain power applications", IEEE Proc., vol. 152, pp. 793-802, 2005.
[3] Steve Hung-Lung Tu and Chu-Tse Lee, "A PWM Controller with Multiple-Access Table Look-up for DC-DC Buck Conversion", World Academy of Science Engineering and Technology, vol. 54, pp. 515-518, 2009.
[4] D.C. Hamill, J. H. B. Deane and D. J. Jefferies, "Modeling of chaotic DC-DC converters by iterated nonlinear mappings", IEEE Tran. Power Electron, vol. 7, no. 1, pp. 25-36, Jan 1992.
[5] P. Klimczak and S. Munk-Nilsen, "Comparative study on paralleled vs. scaled DC-DC converters in high voltage gain applications", Power electronic and Motion Control Conf. EPEPEMC 2008 13th, vol. 1, pp. 108-113, 2008.
[6] H. R. E. Larico, D. S. Greff and J. A. Heerdt, "Modeling and control of a three-phase push-pull dc-dc converter: Theory and simulation", 2015 IEEE 13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC), pp. 1-5, 2015.
[7] J.H. DEANE and D HAMIL, "Improvement of power supply EMC by chaos", Electronics Letters, 1996.
[8] G. Zhang, Y. Liao, S. S. Yu and Y. Zhang, "A Graph-Modeling Approach to Topology Simplification in Power Converters", IEEE Transactions on Power Electronics, vol. 37, no. 7, pp. 8248-8261, July 2022.
[9] M. Kaya, A. Costabeber, A. J. Watson, F. Tardelli and J. C. Clare, "A Push-Pull Series Connected Modular Multilevel Converter for HVdc Applications", IEEE Transactions on Power Electronics, vol. 37, no. 3, pp. 3111-3129, March 2022.
[10] A. Aldana, O. Beltran and C. Rodrigez, "Design Modelling and Implementation of a Push-Pull Converter used in Grid Connected Photovoltaic Systems", Journal of Engineering Science and Technology Review, vol. 11, no. 4, pp. 132-137, 2018.
[11] M. L. Flach, L. G. Scherer and R. F. de Camargo, "Development of a Hybrid Microgrid for Power Generation Through the Interconnection of Sources with a Push-Pull Converter", 2021 Brazilian Power Electronics Conference (COBEP), pp. 1-8, 2021.
[12] U. Suprabha Padiyar and R. Kalpana, "Design & Analysis of Push-pull Converter Fed Battery Charger for Electric Vehicle Application", IEEE International Conference on Power Electronics Smart Grid and Renewable Energy (PESGRE), pp. 1-6, 2022.
[13] S. Lim, J. Ranson, D. M. Otten and D. J. Perreault, "Two-Stage Power Conversion Architecture Suitable for Wide Input Voltage", IEEE Transactions on Power Electronics, vol. 30, no. 2, pp. 805-816, Feb. 2015.
[14] C. Fei, M. H. Ahmed, F. C. Lee and Q. Li, "Dynamic bus voltage control for light load efficiency improvement of two-stage voltage regulator", IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1-8, 2016.
[15] I. Barbi and R. Gules, "Isolated DC-DC converters with high-output voltage for TWTA tele-communication satellite applications", IEEE Trans-actions on Power Electronics, vol. 18, no. 4, pp. 975-984, July 2003.
[16] A. Ferreres, J. A. Carrasco, E. Maset and J. B. Ejea, "Small-signal modeling of a controlled transformer parallel regulator as a multiple output converter high efficient post-regulator", IEEE Transactions on Power Electronics, vol. 19, no. 1, pp. 183-191, Jan. 2004.
