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《Transactions of China Electrotechnical Society》 2015-09
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Research on Voltage Controlled Variable Capacitor in the Passive Lossless Snubber for Soft-switching Circuits

Wang Beibei;Zheng Qionglin;Zhang Jiepin;Li Yan;School of Electrical Engineering Beijing Jiaotong University;  
A voltage controlled variable capacitor in the passive lossless snubber for soft-switching circuits is presented in this paper to further reduce the turn-off loss of IGBT. This voltage controlled variable capacitor consists of two snubber capacitors and an auxiliary MOSFET, which is controlled by the voltage across the snubber capacitor and the auxiliary voltage source. Before IGBT is turned off,the control signal of MOSFET is high and it is turned on automatically. So both two snubber capacitors are connected in parallel with IGBT and the voltage controlled variable capacitor represents large capacitance. Then the voltage across IGBT can be greatly suppressed. When the control signal of MOSFET falls to the turn-off threshold,it is turned off and the voltage controlled variable capacitor represents small capacitance. The working principles and additional loss are analyzed in detail in this paper. At last,the prototype of Buck converter is built to verify these theories.
【CateGory Index】: TN322.8
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 QU Xu-guang1, KONG Li2(1.Institute of Electrical Engineering, Chinese Academic of Sciences, Beijing 100080, China; 2.Graduate School of Chinese Academic of Sciences, Beijing 100039, China);A Passive Lossless Soft-switching Technique with Minimum Voltage Stress[J];Power Electronics;2005-02
【Co-citations】
Chinese Journal Full-text Database 4 Hits
1 WANG Xiao-na, MENG Li-chan, XING Yan (Nanjing University of Aeronautics and Astronautics, Nanjing Jiangsu 210016, China);Fan Speed Control Based on FSCT Chip[J];Power Supply Technologies and Applications;2006-02
2 HE Wei-jun,HE Li-gao,WU Jian,XUE Ying-feng(Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China);A novel Minimun Voltage Stress Passive Lossless Snubber with Coupled-inductor[J];Power Electronics;2009-07
3 ZHANG Housheng(School of Electrical & Electronic Engineering,Shandong University of Technology,Zibo 255049,China);Passive lossless soft-switching high power factor rectifier with one-cycle control[J];Electric Power Automation Equipment;2010-07
4 Zhang Housheng(Shandong University of Technology, Zibo 255049, China);Research on a Novel Passive Lossless Soft-switching Converter[J];Electrical Automation;2009-04
China Proceedings of conference Full-text Database 1 Hits
1 ZHUANG Liu-jie (School of Electrical and Electronical Engin.,Hubei Univ.of Technology,Wuhan 430068,China);The Development of the Modern Power Electronic Devices and Technology of PWM Control[A];[C];2006
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