Research on improving the repetition-rate stability of triggered gas gap switch under millisecond charging conditions
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摘要: 毫秒（ms）充电的PFN-Marx型脉冲驱动源在轻量化、小型化实现方面具有较大潜力，为实现其长寿命稳定可靠运行，需解决的关键技术之一是提升气体触发开关重频稳定性。研制了一套基于电晕稳定开关工作原理的气体触发开关，以解决ms充电条件下开关工作电压分散性大、触发电极烧蚀过快的难题。围绕该开关开展了结构设计、静电场仿真、触发器研制、触发开关工作范围、时延及其抖动等研究，解决了ms充电条件下开关发生自击穿或触而未发概率高的问题。实验研究结果表明：所设计触发开关在工作气体SF6、气压0.6 MPa的条件下，开关最高工作电压达到90 kV，在开关工作电压84 kV、重频20 Hz、串内脉冲数500个、开关不换气的条件下，连续累计测试开关寿命10万次，期间仅出现1次自击穿，自击穿率＜0.01‰，初步实现了电触发开关具有一定工作范围和寿命的设计目标。Abstract:
Background The PFN-Marx pulse driver with millisecond charging holds significant potential for achieving lightweight and miniaturized systems. To ensure its long-life, stable, and reliable operation, the development of a triggered gas gap switch represents a key technological challenge.Purpose This study aims to address issues related to the large dispersion in operating voltage and the rapid erosion of the trigger electrode under millisecond charging conditions.Methods Based on the operating mechanism of the corona-stabilized switch, a corona-based gas-triggered switch was developed. Investigations were conducted on its structural design, electrostatic field simulation, trigger source development, operational voltage range, time delay, and jitter characteristics. These efforts resolved the problem of frequent self-breakdown or trigger failure under millisecond charging.Results Experimental results demonstrate that, using SF6 as the working gas at a pressure of 0.6 MPa, the maximum operating voltage of the triggered switch reaches 90 kV. Under conditions of 84 kV operating voltage, 20 Hz repetition frequency, 500 pulses per burst, and without gas replacement, the switch was tested continuously for 100,000 pulses. Only one self-breakdown incident occurred during this period, resulting in a self-breakdown rate of less than 0.01‰.Conclusions The triggered switch developed in this study meets the design requirements and effectively resolves the instability issues under millisecond charging conditions, thereby providing a foundation for future engineering applications.-
Key words:
- triggered switch /
- PFN-Marx /
- millisecond charging /
- corona-stabilized switch /
- pulse power
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图 6 环形电晕触发开关静电场仿真模型及电场分布云图
Figure 6. Simulation model of E-field of the annular corona trigger switch
图 7 开关电极表面场强分布
Figure 7. The electric field distribution on the surface of the switching electrode
图 9 无触发极触发开关自击穿电压
Figure 9. Self-breakdown voltage of the switch without trigger electrode
图 10 有触发极触发开关自击穿电压
Figure 10. Self-breakdown voltage of the switch with trigger electrode
图 11 重复频率对开关工作电压影响
Figure 11. Influence of repetition-rate on the working voltage of the switch
图 13 不同气压下触发开关工作范围
Figure 13. Working range of the switch under different SF6 pressures
图 14 开关工作欠压比对触发脉冲幅值的影响
Figure 14. Influence of the under-voltage ratio of the switch operation on the amplitude of the trigger pulse
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