Parameter optimization design of snubber circuit for high voltage protection switch
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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。针对于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。Abstract: The ion source and electron gyrotron of the fusion auxiliary heating system are prone to failure and expensive. In order 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. In order to solve the problems existing in the current parameter design, we establish the MOSFET model with snubber circuit and stray inductor firstly and analyze its turn-off process, thus the theoretical design method and expression of snubber circuit for suppressing voltage spike are obtained. In order to solve the problem that the distributed capacitance is not considered in series voltage-balancing, by constructing the isoelectric point, we establish and analyze the equivalent circuit with distributed capacitance, and obtain 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. In order to verify the rationality of the parameter design, the simulation analysis is carried out. The simulation results show that the overall design scheme can meet the design requirements of peak suppression and voltage-balancing.
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图 1 电压钳位型均压电路原理图
Figure 1. Schematic diagram of voltage clamp voltage-balancing circuit
图 2 电压钳位型均压电路工作原理图
Figure 2. Working principle diagram of voltage clamp voltage-balancing circuit
图 8 考虑分布电容和缓冲电路的串联MOSFET等效电路
Figure 8. Equivalent circuit of series MOSFET considering distributed capacitor and snubber circuit
图 15 等参数缓冲电路的两管电压波形图
Figure 15. Two-tube voltage waveform of isoparametric snubber circuit
图 16 非等参数缓冲电路的两管电压波形图
Figure 16. Two-tube voltage waveform of non-isoparametric snubber circuit
表 1 拓扑工作模式
Table 1. Topology working mode
Pattern T1 T2 Module voltage Single tube current Function 1 on on 0 i1/2 Over-current balancing 2 on off 0 i1 Conduction discharge 3 off off V1 0 Current shutoff 4 off on 0 i1 Conduction discharge 
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表 2 MOSFET工作模式
Table 2. Working mode of MOSFET
Operation mode Cgs Cgd Cds Channel condition Vgs＞Vth and Vds≤Vgs-Vth Ohmic Cgs Cgd2 Cds2 Constant resistance Rds(on) Vgs＜Vth Cut off Cgs Cgd1 Cds1 Open circui
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