低抖动快前沿高电压重复率触发器
Repetitive trigger generator with low jitter and fast rise time
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摘要: 介绍了一种低抖动、快前沿高电压重复率触发器，输出参数为：重复率可达100 pulse/s，输出时延约225 ns，抖动约1 ns，前沿约26 ns，脉宽约70 ns，高阻负载上电脉冲的峰值可达-40 kV，重复率为50 pulse/s时，峰值可达-51 kV，单次工作时的峰值可达-60 kV。该触发器主要由控制单元、高压供电单元与脉冲形成单元构成，脉冲形成单元采用了低电感电容对负载快放电的结构，建立开关为氢闸流管。实验发现,氢闸流管存在微导通状态，开关的通道电阻及维持的时间与开关极间的电势差有关;电势差越高，通道电阻越小，微导通状态维持的时间越长。此外,氢闸流管的导通性能受灯丝加热电源的影响明显，当加热电压较低时，氢闸流管导通缓慢，延时与抖动较大，当加热电压过高时，氢闸流管易于发生自击穿。Abstract: A repetitive trigger generator with low jitter and fast rise time is introduced and the principles of designing and choosing the units in the trigger generator are given. The trigger generator is composed with control unit, charging unit and pulse forming unit. The pulse forming unit is a capacitor-fast-discharging trigger with hydrogen thyratron. The repetitive rate of trigger can reach 100 pps (pulses per second), the delay time is about 225 ns, the jitter is about 1 ns, the rise time is about 26 ns and the FWHM (full-width at half-magnitude) is about 70 ns. The amplitude of electrical pulse on the load with high impedance is about -40 kV at 100 pps, -51 kV at 50 pps, -60 kV at single shot, respectively. The micro-closing of hydrogen thyratron is discussed. As the anode voltage increases
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Key words:
- repetitive trigger generator /
- electrical pulse trigger /
- fast rise time /
- low jitter /
- pulsed power
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