无源无损软开关中压控可变电容的研究

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摘要在无源无损软开关中采用压控可变电容的方法来进一步减少IGBT的关断损耗,从而缓解其散热压力。该压控可变电容由两个缓冲电容和辅助MOSFET构成,其控制方法简单,可自动实现电容容值的变换。同时,辅助MOSFET由其串联支路上的电容电压和辅助电源控制。在IGBT关断之前,MOSFET由于其控制信号为高电平而处于导通状态,因此当IGBT关断时,可变电容等效为两个电容并联,从而表现为大电容特性,减少其CE两端电压的上升斜率;当MOSFET的控制信号下降到关断阈值时,可变电容表现为小电容特性,从而快速达到IGBT的关断稳态。依据可变电容的理论波形对其工作原理进行详细分析,并对该无源无损软开关回路中额外损耗进行理论计算。最后通过搭建Buck变换器的实验平台对上述理论进行验证。

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	王蓓蓓
	郑琼林
	张捷频
	李艳

关键词 ：无源无损软开关, 压控可变电容, 附加损耗, 辅助电源

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.

Key words： Passive lossless snubber voltage controlled variable capacitor additional loss auxiliary voltage source

收稿日期: 2014-11-06 出版日期: 2015-05-22

PACS:

TM532

通讯作者: 王蓓蓓女,1990年生,硕士研究生,研究方向为电力电子变换及软开关技术。

作者简介: 王蓓蓓女,1990年生,硕士研究生,研究方向为电力电子变换及软开关技术。郑琼林男,1964年生,教授,博士生导师,研究方向为轨道交通牵引供电与交流传动、高性能低损耗电力电子系统、光伏发电并网与控制和电力有源滤波与电能质量。

引用本文:

王蓓蓓, 郑琼林, 张捷频, 李艳. 无源无损软开关中压控可变电容的研究[J]. 电工技术学报, 2015, 30(9): 79-86. Wang Beibei, Zheng Qionglin, Zhang Jiepin, Li Yan. Research on Voltage Controlled Variable Capacitor in the Passive Lossless Snubber for Soft-switching Circuits. Transactions of China Electrotechnical Society, 2015, 30(9): 79-86.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I9/79

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