辉光放电触发赝火花开关实验研究

Experimental investigation on pseudospark switch with glow discharge trigger

设计了一种辉光放电触发赝火花开关,进行了He气介质下的放电实验研究。测得了耐受电压和气压关系,结果表明:随着气压的升高,开关耐受电压减小;开关电极孔径为3mm、电极间距为4mm时的耐受电压约是电极孔径和电极间距均为3mm时的85%。在电极孔径和电极间距均为3mm时,研究了辉光放电电流、气压、触发电压等参数对开关时延、抖动的影响。结果显示:当辉光放电电流大于0.45mA、气压为7～30Pa、触发电压达到一定值,开关就能比较稳定地触发,时延短、抖动小。在辉光放电触发下,实现了开关耐受30.5kV、时延223.2ns的输出,并实现了开关抖动小于1ns的稳定输出。

A type of glow discharge triggered pseudospark switch is designed, and experimental investigation of the switch filled with He is presented. The relationship between hold-off voltage and gas pressure is measured, which shows that as gas pressure increases, hold-off voltage declines. The hold-off voltage of the pseudospark switch with 3 mm borehole diameter and 4 mm electrode distance is about 85% of that of the switch with the borehole diameter and electrode distance of 3 mm. When the borehole diameter and electrode distance are 3 mm, the influences of parameters on the time delay and jitter of the pseudospark switch is researched, such as glow discharge current, gas pressure and trigger voltage. When glow discharge current is more than 0.45 mA, gas pressure ranges in 7~30 Pa and trigger voltage attains a certain value, the switch can be triggered stably with little time delay and jitter. Stable output of the switch with hold-off voltage of 30.5 kV, time delay of 223.2 ns and jitter less than 1ns is realized under the glow discharge trigger.