陡化前沿Marx发生器中开关过电压的研究  

Investigation on Over Voltage of the Spark Gap Switch in a Wave Erection Marx Generator

作　　者：高景明[1] 刘永贵[1] 刘金亮[1] 杨建华[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《高电压技术》2009年第1期75-81,共7页High Voltage Engineering

基　　金：国家高技术发展计划项目(编号略)~~

摘　　要：为了解陡化前沿Marx发生器单级放电回路中影响气体火花开关过电压的因素,在理论分析了过电压幅值后进行了实验研究。分析认为:消除级间元件的耦合电容与增大开关电极对地的分散电容是设计陡化前沿Ma-rx发生器的关键;10级陡化前沿Marx发生器放电模型的计算分析表明,开关电极对地分散电容还应具备一定的数值才能实现快前沿高压脉冲的建立。基于以上分析设计制作的10级陡化前沿Marx发生器充电40 kV时,在90Ω负载上得到了电压幅值约为210 kV,电流约为2.3 kA,脉冲前沿时间约为4 ns的高压脉冲,验证了分析的正确性。最后分析了发生器工作在SF6气体中分别采用电感隔离充电与电阻隔离充电时发生器输出脉冲波形的差异,并对陡化前沿Marx发生器的进一步优化设计给出了一些实用的建议。The factors affecting over voltage of the spark gap switch in a single discharging circuit of wave erection Marx generator is theoretically analyzed. It is found from the viewpoint of the influence on the amplitude of over voltage that eliminating the coupling stray capacitance between stages and increasing the stray capacitance between electrodes and ground are critical for the design of wave erection Marx generators; moreover, in the simulation about the equivalent discharging circuit of a 10-stage wave erection Marx generator, the stray capacitance between electrodes and ground should also be of proper value for the erection of fast rise-time high-voltage pulse. Based on the analysis above, a 10-stage wave erection Marx generator is designed and constructed, producing a high voltage pulse of 210 kV, 2.3 kA and rise time of about 4 nanoseconds on a 90 Ω dummy load, with a charging voltage of 40 kV. The experimental results verify the analysis basically. When the generator working in SF6, the divergences of output pulse waveforms between inductively isolated charging configuration and resistively isolated charging configuration are analyzed preliminarily, and then the further optimized design of wave erection Marx generators is proposed.

关 键 词：陡化前沿 MARX发生器 气体火花开关 过电压 分散电容 电阻隔离 电感隔离 

分 类 号：TN782[电子电信—电路与系统]