单开关谐振脉冲电源的过电压抑制  

Overvoltage Suppression of Single Switch Resonant Pulse Power Supply

作　　者：梁启宇 王永刚 邱胜顺 LIANG Qiyu;WANG Yonggang;QIU Shengshun(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Zhihui Healthcare Equipment Branch,Shanghai Electric Holdings Group Co.,Ltd.,Shanghai 200233,China)

机构地区：[1]上海理工大学机械学院,上海200093 [2]上海电气控股集团有限公司智惠医疗装备分公司,上海200233

出　　处：《电子科技》2024年第6期17-28,共12页Electronic Science and Technology

基　　金：国家自然科学基金青年基金(51707122);国家重点研发计划(2019YFC0119100)。

摘　　要：单开关谐振电路只需使用一个开关即可产生高压脉冲,然而当开关在谐振电流为正关断时会产生关断过电压,使开关损坏。为解决该问题,可在开关两端并联RCD(Resistance-Capacitance-Diode)吸收电路或在变压器原边并联R-D(Resistance-Diode)续流支路。但在高压脉冲条件下,这两种过电压抑制电路在不同负载下的带载特性以及效果优劣不明确。文中对比分析了两种电路的过电压抑制机理、参数选择依据、过电压抑制效果和元器件功耗。结果表明,含R-D支路的电源开关过电压与漏感电流和支路电阻R成正比,若R较大,其过电压系数大于含RCD吸收电路的电源。若R较小,元器件功率损耗较大。在高压脉冲电源中,RCD吸收电路的电容不需要在开关导通时将电放完。由于漏感限制,谐振脉冲电路在短路时电流不会过大而烧毁开关。同时,在驱动容性介质阻挡放电时电流能够自动反向,可实现零电流关断。The single-switch resonant circuit can generate high-voltage pulses using only one switch,however,when the switch is turned off at a positive resonant current,a turn-off overvoltage is generated,which damages the switch.To solve this problem,the RCD(Resistance-Capacitance-Diode)snubber circuit is paralleled with the switch or the R-D(Resistance-Diode)freewheeling branch is paralleled with the primary side of the transformer.However,under high-voltage pulse conditions,the loading characteristics and effects of the two overvoltage suppression circuits under different loads are still unclear.This study compares and analyzes the overvoltage suppression mechanism,parameter selection basis,overvoltage suppression effect and the components power loss of the two circuits.The results show that the overvoltage of the power supply switch with R-D branch is proportional to the leakage inductance current and the resistance R of the branch.If R is larger,its overvoltage coefficient is larger than that of the power supply with RCD absorption circuit.And if R is smaller,the components power loss is large.In a high-voltage pulse power supply,the capacitance of the RCD snubber circuit does not need to discharge the power.Due to the limitation of leakage inductance,when the resonant pulse circuit is short-circuited,the current is not too large to burn the switch.When driving the capacitive dielectric barrier discharge,the current can be reversed automatically to achieve zero current shutdown.

关 键 词：单开关谐振电路 高压脉冲功率 脉冲变压器 开关关断过电压 过电压抑制电路 零电流关断 Pspice参数化仿真 介质阻挡放电 

分 类 号：TN787[电子电信—电路与系统] TM832[电气工程—高电压与绝缘技术]