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| Research on Clamping Diode Current Resetting Scheme of ZVS PWM Full Bridge Converter |
| Chen Wu, Ruan Xinbo, Chen Qianhong, Ge Junji |
| Nanjing University of Aeronautics and Astronautics Nanjing 210016 China |
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Abstract Introducing a resonant inductor and two clamping diodes into the full bridge converter can widen the load range of zero-voltage-switching (ZVS) and eliminate the voltage spike across the rectifier diodes. The resonant inductor is short-circuited and its current keeps constant when the clamping diode conducts under heavy-load condition, resulting in larger conduction losses in the power switches and clamping diodes. Furthermore, the clamping diodes are turned off hard when the load current is reduced to a certain degree, leading to serious reverse recovery loss or even failure of the clamping diodes. In this paper, the operation principle of the full bridge converter with clamping diodes under light-load condition is analyzed in detail and three kinds of clamping diode current resetting schemes are presented, in the meanwhile, the pros and cons of several existing clamping diode current resetting circuits are compared and a novel ZVS PWM full bridge converter employing auxiliary transformer to reset clamping diode current is proposed. With the introduced auxiliary transformer, the clamping diode current can be decayed rapidly over the whole load range, thus not only the conduction losses can be reduced and the conversion efficiency can be increased, but also the hard turn-off of the clamping diodes can be avoided. The operation principle of the novel ZVS PWM full bridge converter with auxiliary transformer is analyzed and the design of the auxiliary transformer is discussed in this paper, and experimental results verify the effectiveness of the proposed full bridge converter.
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Received: 11 June 2010
Published: 07 March 2014
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[1] Ruan X, Yan Y, Soft-switching techniques for pwm full bridge converters[C], Proceedings of IEEE Power Electronics Specialists Conference, 2000: 634-639.
[2] Park K B, Kim C E, Moon G W, et al. Voltage oscillation reduction technique for phase-shift full-bridge converter[J]. IEEE Transactions on Industrial Electronics, 2007: 2779-2790.
[3] Blair B O, Fasullo G H, Harvey J E, et al. DC/DC ZVS full bridge converter power supply method and apparatus: United States, US 6483724 B1[P], 2002.
[4] Redl R, Sokal N O, Balogh L. A novel soft-switching full-bridge dc/dc converter: analysis, design considerations, at 1.5kW, 100kHz[J]. IEEE Transactions on Power Electronics, 1991: 408-418.
[5] Redl R, Balogh L, Edwards D W. Optimal ZVS full-bridge dc/dc converter with PWM phase-shift control: analysis, design considerations, and experimental results[C]. Proceedings of IEEE Applied Power Electronics Conference, 1994: 159-165.
[6] Redl R, Balogh L, Edwards D W. Switch transitions in the soft switching full-bridge PWM phase-shift dc/dc converter: analysis and improvements[C] Proceedings of International Telecommunications Energy Conference, 1993: 50-357.
[7] Ruan X, Liu F. An improved ZVS PWM full-bridge converter with clamping diodes[C]. Proceedings of IEEE Power Electronics Specialists Conference, 2004: 1476-1481.
[8] Yin L, Chen Q, Peng B, et al. Key issues of clamping diodes in DCM phase-shift full-bridge converter[C]. Proceedings of IEEE Power Electronics Specialists Conference, 2007: 1721-1725.
[9] Chen W, Ruan X, A novel zero-voltage- switching pwm full bridge converter[J]. IEEE Transactions on Power Electronics, 2008: 793-801.
[10] 陈乾宏, 殷兰兰, 王健, 等. 二极管加电流互感器钳位的移相全桥DC/DC变换器[J]. 中国电机工程学报, 2008, 28(15): 23-31.
Chen Qianhong, Yin Lanlan, Wang Jian, et al. Diodes with current transformer clamped phase-shifted full-bridge converter[J]. Proceedings of the CSEE, 2008, 28(15): 23-31. |
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2011, Vol. 26 
