为了提高脉冲形成线的输出耐压,采用组叠的方式将多个单级脉冲形成线进行串叠,可实现脉冲功率系统的小型化设计。基于多级薄膜介质线脉冲形成叠加技术,研究了气体火花间隙开关对多级脉冲形成线输出波形的影响。介绍了开关的设计原则,分析了开关抖动、开关电感、开关电阻对多级脉冲形成线输出特性的影响,并且从实验上研究了开关的导通特性对脉冲形成线输出波形的影响。实验结果表明: 开关抖动会引起脉冲输出波形平顶时间减小,并且开关触发抖动会引起绝缘介质上的过电压条件,从而影响系统的绝缘设计; 开关电感会使脉冲前沿变缓,平顶宽度变窄,后沿存在扭曲变形,存在拖尾现象; 开关电阻的存在会降低输出效率。

A multi-stage stacked Blumlein line commutated by individual gas switches is designed. Comparative analysis of gas switch effect on the output waveform for the multi-stage Blumlein line is carried out. The switch jitter and electrical characteristics strongly influence the performance of the line and the stresses on the dielectric. The effects of switch jitter, inductance, the resistive decay during closure, and the closed-state resistance on the output pulse are explored for stacked Blumlein lines using SPICE simulations. Furthermore, the impact of switch operation on a four-stage stacked Blumlein line is studied experimentally.