高压保护开关缓冲电路参数优化设计  

Parameter optimization design of snubber circuit for high voltage protection switch

作　　者：李志恒 马少翔 张鸿淇 朱帮友 张明 于克训 潘垣 Li Zhiheng;Ma Shaoxiang;Zhang Hongqi;Zhu Bangyou;Zhang Ming;Yu Kexun;Pan Yuan(International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineeringand Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学,电气与电子工程学院强电磁工程与新技术国家重点实验室,磁约束聚变与等离子体国际合作联合实验室,武汉430074

出　　处：《强激光与粒子束》2024年第2期58-69,共12页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2017YFE0300104);国家自然科学基金项目(51821005)。

摘　　要：目前的高压保护开关缓冲电路参数设计缺乏相关理论设计方法,同时缓冲电路方案由于设计过程中并未考虑分布电容影响,因此均为等参数设计方案,这种方法均压效果不够理想。为了解决目前参数设计中存在的问题,首先建立了含缓冲电路和杂散电感的MOSFET模型并对其关断过程进行了分析,从而得到了抑制电压尖峰的缓冲电路理论设计方法及表达式。针对串联均压未考虑分布电容的问题,通过构造等电位点,建立了含有分布电容的等效电路并进行分析,根据电荷方程等式得到了缓冲电路非等参数设计方法及表达式,该参数设计方法可以补偿分布电容造成的电压分布不均,并更好地指导高压保护开关的均压方案设计。为了验证参数设计的合理性进行了仿真分析,结果表明,最终得到的整体设计方案可以满足尖峰抑制以及均压的设计要求。The ion source and electron gyrotron of the fusion auxiliary heating system are prone to failure and expensive.To protect them,it is necessary to study the high voltage switch scheme.The parameter design methods of high voltage protection switch snubber circuit are lack of relevant theoretical design methods currently,and the snubber circuit schemes are isoparametric design schemes because the influence of distributed capacitance is not taken into account in the design process.The voltage-balancing effect of this method is not ideal.To solve the problems existing in the current parameter design,we have established the MOSFET model with snubber circuit and stray inductor and analyze its turn-off process,thus to obtain the theoretical design method and expression of snubber circuit for suppressing voltage spike.Taking the distributed capacitance into consideration in series voltage-balancing and constructing the isoelectric point,we have established and analyzed the equivalent circuit,and obtained the non-equal parameter design method and expression of snubber circuit according to the charge equation.This parameter design method can compensate the uneven voltage distribution caused by distributed capacitance and guide the voltage-balancing scheme design of high voltage protection switch better.To verify the rationality of the parameter design,we have a carried out,simulation analysis.which shows that the overall design scheme can meet the design requirements of peak suppression and voltage-balancing.

关 键 词：高压开关 缓冲电容 缓冲电阻 分布电容 均压 

分 类 号：TM832[电气工程—高电压与绝缘技术]