Abstract：In high voltage and large power applications,IGBTs are often chosen as power switches. Due to their tail currents,zero current turning-off can reduce switching loss effectively. A two-winding coupled inductor and two diodes are introduced to realize zero-voltage and zero-current switching(ZCS) for phase-shifted full-bridge converter. ZCS of the lagging-leg switches is achieved in wide load range. The added diodes are turned on and off with soft switching. The leakage inductor of the coupled inductor will not increase voltage stress of the added diodes. To reduce the impact of magnetizing current of the coupled inductor on ZCS,two small capacitors are paralleled with two diodes,respectively. Without increasing the size of the coupled inductor,the interval of the reset voltage is increased so that the lagging-leg switches can be turned off with ZCS in practice. The analysis is verified by simulation and experimental results on a 68 kHz,100 V/10 A prototype. The results of simulation and experiment verify the validity of the proposed scheme.
[1] Watson R,Lee F C.Analysis,design,and experimental results of a 1 kW ZVS-FB-PWM converter employing magamp secondary-side control[J].IEEE Transactions on Industrial Electronics,1998,45(5):806-814. [2] Hua G,Lee F C,Jovanovic M M.An improved full-bridge zero-voltage-switched PWM converter using a saturable inductor[J].IEEE Transactions on Power Electronics,1993,8(4):530-534. [3] 陈仲,李梦南,汪洋.ZVS全桥变换器辅助网络技术的比较研究[J].电工技术学报,2015,30(22):89-99. Chen Zhong,Li Mengnan,Wang Yang.Comparison study on auxiliary network techniques of zero voltage switching full bridge converter[J].Transactions of China Electrotechnical Society,2015,30(22):89-99. [4] 张欣,陈武,阮新波.一种辅助电流可控的移相全桥零电压开关PWM变换器[J].电工技术学报,2010,25(3):81-88. Zhang Xin,Chen Wu,Ruan Xinbo.A novel ZVS PWM phase-shifted full-bridge converter with controlled auxiliary circuit[J].Transactions of China Electrotechnical Society,2010,25(3):81-88. [5] Chen Zhong,Ji Biao,Ji Feng,et al.A novel ZVS full-bridge converter with auxiliary circuit[C]//Proceedings of Applied Power Electronics Conference and Exposition,Palm Springs,CA,2010:1448-1453. [6] Wu Xinke,Zhang Junming,Xie Xiaogao,et al.Analysis and optimal design considerations for an improved full bridge ZVS DC-DC converter with high efficiency[J].IEEE Transactions on Power Electronics,2006,21(5):1225-1234. [7] Zhang Junming,Xie Xiaogao,Wu Xinke,et al.Comparison study of phase-shifted full bridge ZVS converters[C]//Proceedings of Power Electronics Specialists Conference,Aachen,Germany,2004:533-539. [8] Yungtaek J,Jovanovic M M.A new family of full-bridge ZVS converters[J].IEEE Transactions on Power Electronics,2004,19(3):701-708. [9] Cho J G,Sabate J A,Hua G,et al.Zero-voltage and zero-current-switching full bridge PWM converter for high-power applications[J].IEEE Transactions on Power Electronics,1996,11(4):622-628. [10]Ruan X B,Yan Y G.A novel zero-voltage and zero-current-switching PWM full-bridge converter using two diodes in series with the lagging leg[J].IEEE Transactions on Industrial Electronics,2001,48(4):777-785. [11]Kim E S,Joe K Y,Kye M H,et al.An improved soft-switching PWM FB DC/DC converter for reducing conduction losses[J].IEEE Transactions on Power Electronics,1999,14(2):258-264. [12]Cho J G,Baek J W,Jeong C Y,et al.Novel zero-voltage and zero-current-switching full-bridge PWM converter using a simple auxiliary circuit[J].IEEE Transactions on Industry Applications,1999,35(1):15-20. [13]Cho J G,Jeong C Y,Lee F C Y.Zero-voltage and zero-current-switching full-bridge PWM converter using secondary active clamp[J].IEEE Transactions on Power Electronics,1998,13(4):601-607. [14]成庶,陈特放,余明扬.一种新型有源次级钳位全桥零电压零电流开关PWM变换器[J].中国电机工程学报,2008,28(12):44-49. Cheng Shu,Chen Tefang,Yu Mingyang.A novel FB-ZVZCS PWM converter using improved secondary active clamping circuit[J].Proceedings of the CSEE,2008,28(12):44-49. [15]Cho J G,Baek J W,Jeong C Y,et al.Novel zero-voltage and zero-current-switching full bridge PWM converter using transformer auxiliary winding[J].IEEE Transactions on Power Electronics,2000,15(2):250-257. [16]许峰,徐殿国,柳玉秀.一种新型的全桥零电压零电流开关PWM变换器[J].中国电机工程学报,2004,24(1):147-152. Xu Feng,Xu Dianguo,Liu Yuxiu.A novel zero-voltage and zero-current-switching (ZVZCS) full-bridge PWM Converter[J].Proceedings of the CSEE,2004,24(1):147-152. [17]袁文,沙德尚,于梦园.一种新型的共用之后桥臂的零电压开关混合型变换器[J].电工技术学报,2015,30(8):113-119. Yuan Wen,Sha Deshang,Yu Mengyuan.A novel full-range ZVS hybrid converter with shared lagging leg[J].Transactions of China Electrotechnical Society,2015,30(8):113-119. [18]Liu C,Gu B,Lai J S,et al.High-efficiency hybrid full-bridge-half-bridge converter with shared ZVS lagging leg and dual outputs in series[J].IEEE Transactions on Power Electronics,2013,28(2):849-861. [19]Gu B,Lin C Y,Chen B F,et al.Zero-voltage-switching PWM resonant full-bridge converter with minimized circulating losses and minimal voltage stresses of bridge rectifiers for electric vehicle battery chargers[J].IEEE Transactions on Power Electronics,2013,28(10):4657-4667. [20]Chen Y,Pei X J,Li P,et al.A high performance dual output dc-dc converter combined the phase shift full bridge and LLC resonant half bridge with the shared lagging leg[C]//Proceedings of Applied Power Electronics Conference and Exposition,Palm Springs,CA,2010:1435-1440. [21]Zhang Y J,Xu D H.Design and Implementation of an accurately regulated multiple output ZVS DC-DC converter[J].IEEE Transactions on Power Electronics,2007,22(5):1731-1742. [22]Li W H,Shen Y Q,Deng Y,et al.A ZVZCS full-bridge DC/DC converter with a passive auxiliary circuit in the primary side[C]//Proceedings of Power Electronics Specialists Conference,Jeju,2006:1-5.
2016, Vol. 31 
