基于移相控制技术的纳秒级高压窄脉冲电源研究

Design of high voltage pulsed power generator based on technology of phase-shifted control

设计了一种基于移相控制充电电路的纳秒级高压窄脉冲50k V电源,与传统的变压器加全桥整流组合开环控制相比,本方案的优点是,不仅可实现对Marx电路进行恒压限流充电控制,而且可对高压窄脉冲的幅值和频率进行调节。为降低发生器在放电时对前级电路造成的影响,利用电感值较大的特制电感进行前后级隔离。实验结果和污染物处理数据表明,在输入电压500V、串联100级电路时可以产生50k V、上升沿宽90ns的高压窄脉冲,并对污染物有较好的处理效果。

This paper presents a design of 50 k V pulsed power generator based on technology of phase-shift with closed-loop control,which can make the pulse voltage with steep front and keep the direct voltage stability with no more burr voltage. Compared with the traditional design which is composed of transformer and full bridge rectifier with open-loop control,this kind of design can make the voltage and frequency variable. The whole power system based on phase-shift-bridge input is composed of 100 stages,and each stage consists of IGBT switch,fast recovery diode and capacitor. In charging process,each capacitor is charged through preceding stage circuit,and the switches close meanwhile. In discharging process,each capacitor is connected through switches,which improve the pulse voltage. Moreover,the inductor acts as an isolator between the DC input and the high voltage pulse output.The experimental results show that,when the input voltage is 500 V,the proposed generator with series connected100 Marx units can generate output pulse with 50 k V-voltage and 90ns-rise time.