Abstract 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.
Wang Beibei,Zheng Qionglin,Zhang Jiepin等. Research on Voltage Controlled Variable Capacitor in the Passive Lossless Snubber for Soft-switching Circuits[J]. Transactions of China Electrotechnical Society, 2015, 30(9): 79-86.
[1] Hu Shao-Wei,Zhu Yang-Jun,Duan Yao-Yu.An impact analysis of gate resistance on static and dynamic dissipation of IGBT modules[C].2011 International Conference on Electronics,Communications and Control,Ningbo,2011:715-718. [2] 汪波,胡安,唐勇,等.IGBT电压击穿特性分析[J].电工技术学报,2011,26(8):145-150. Wang Bo,Hu An,Tang Yong,et al.Analysis of voltage breakdown characteristic of IGBT[J].Transactions of China Electrotechnical Society,2011,26(8):145-150. [3] 程哲昕,朱学军,张逸成,等.无源无损软开关在非隔离PWM变换器中的应用[J].电子技术应用,2008,34(12):85-88. Cheng Zhexin,Zhu Xuejun,Zhang Yicheng,et al.The application of passive lossless soft-switch in non-isolated PWM converters[J].Application of Electronic Technique,2008,34(12):85-88. [4] Wu Xuezhi,Jin Xinmin,Huang Lipei,et al.A lossless snubber for DC/DC converters and its application in PFC[C].The Third International Power Electronics and Motion Control Conference,Beijing,2000,3:1144-1149. [5] 屈旭光,孔力.一种最小电压应力的无源无损软开关技术[J].电力电子技术,2005,39(2):47-49. Qu Xuguang,Kong Li.A passive lossless soft-switching technique with minimum voltage stress[J].Power Electronics,2005,39(2):47-49. [6] 孙进,王少坤,霍红光.无源无损软开关功率因数校正电路的研制[J].电子设计工程,2009,17(6):31-35. Sun Jin,Wang Shaokun,Huo Hongguang.Design of passive lossless soft-switching power factor correction circuit[J].Electronic Design Engineering,2009,17(6):31-35. [7] 张厚升.新型无源无损软开关boost变换器研究[J].电气自动化,2009,31(4):69-71. Zhang Housheng.Research on a novel passive lossless soft-switching converter[J].Electrical Automation,2009,31(4):69-71. [8] Matsushita Akihisa,Tai Hiromichi,Yasuoka Ikuo,et al.Inverter circuit with the regenerative passive snubber[C].Power Conversion Conference,Nagoya,2007:167-171. [9] 马柯,李睿,徐德鸿.CE端并联电容对IGBT关断损耗的影响[C].中国电工技术学会电力电子学会第十一届学术年会论文集,杭州,2009. Ma Ke,Li Rui,Xu Dehong.Impact of the paralleled capacitor on the turn off loss of IGBT[C].The 11th academic annual meeting in Power Electronics Society of China Electrotechnical Society,Hangzhou,2009. [10]Steyn C G,van Wyk J D.Study and application of nonlinear turn-off snubber for power electronic switches[J].IEEE Transaction on Industry Applications,1986,22(3):471-477. [11]Wei Jia,Liu Zewen,Fang Tie,et al.The study on a voltage controlled capacitor with complex membrane[C].7th International Conference on Solid-State and Integrated Circuits Technology,Beijing,2004:1707-1710. [12]Ghandour S,Despesse Ghislain,Basrour S.Design of a new MEMS DC/DC voltage step-down converter[C].8th IEEE International NEWCAS Conference,Montreal,QC,2010:105-108. [13]Harada K,Katsuki A,Fujiwara M,et al.Resonant converter controlled by variable capacitance devices[J].IEEE Transaction on Power Electronics,1993,8(4):404-410. [14]Steyn C G,van Wyk J D.Optimum nonlinear turn-off snubbers:design and application[J].IEEE Transaction on Industry Applications,1989,25(2):298-306. [15]Steyn C G.Optimum size of dissipative nonlinear turn-off snubber[J].Electric Power Applications,1988,135(4):165-171. [16]白保东,陈德志,王鑫博.逆变器IGBT损耗计算及冷却装置设计[J].电工技术学报,2013,28(8):97-106. Bai Baodong,Chen Dezhi,Wang Xinbo.Loss calculation of inverter IGBT and design of cooling device[J].Transactions of China Electrotechnical Society,2013,28(8):97-106.
2015, Vol. 30 
