基于冷阴极触发管的重频高压脉冲源设计

Design of the Repetition-rate High Voltage Pulsed Power by Cold Cathode Trigger Tube

为满足爆轰物理实验、X光机以及Marx脉冲功率装置等触发系统的需求,设计了一种输出幅度在8~15 k V、重复频率1~40 Hz工作的重频高压脉冲源。采用固定频率脉宽调制（PWM）控制器TL494集成电路,构建高压电源给储能电容提供所需能量;在手动触发、光触发（单次和重频）以及电触发三种触发脉冲信号的作用下驱动IGBT半导体开关,经脉冲变压器变换后控制冷阴极触发管迅速导通,致使储能电容上的能量在75Ω负载上瞬间产生放电,得到一路幅度大于15 k V、脉冲前沿小于13 ns、脉宽大于500 ns的高压脉冲和一路幅度大于150 V、前沿小于8.3 ns、脉宽大于1μs的同步脉冲,系统抖动时间绝对值小于10 ns。通过实验结果验证了所采用的设计原理及方法的可行性,并给出了重频工作下高压脉冲源输出的实验结果。

To fulfill the demand of the trigger system of detonation physics experiment, X-ray system and Marx pulse power system, a high voltage pulse trigger with output voltage of 8~15 kV and repetitive frequency of 1~40 Hz is designed. Based on the PWM TL494 integration circuit with fixed frequency, the high voltage power supply was established and supplied the energy to the storage capacitor. The storage capacitor discharged through IGBT and cold cathode trigger tube with manual trigger, optical trigger and electric trigger signal, two in-phase pulses were gotten, the pulse of one channel is with more than15 kV output voltage, less than 13 ns fall time, more than 500 ns pulse width, and another pulse is with more than 150 V output voltage, less than 8.3 ns fall time, more than 1 μs pulse width and jitter less than 10 ns. The experimental results validate the feasibility of the designed theory and method.