一种脉宽可调的陡化后沿高压脉冲发生器

Pulse width adjustable pulse generator with steepened falling edge

磁开关因其独特的饱和导通机制而在脉冲功率技术领域应用广泛,利用磁开关饱和前后电感差异大的特点,可以将其用作撬断开关来陡化脉冲后沿。利用金属氧化物压敏电阻的稳压特性,能在负载上得到具有一定平顶的脉冲准方波,进而可通过改变磁开关的伏秒积来进行脉宽调整。提出一种脉宽可调的高压脉冲发生器技术方案,利用压敏电阻产生高压脉冲准方波,用磁开关作为撬断开关来陡化脉冲后沿,并通过改变磁开关复位电流的大小来控制磁开关的复位深度,进而实现脉宽可调。首先进行了理论分析及软件模拟研究,然后基于模拟结果开展了初步实验研究。初步实验得到的负载电压波形后沿小于30 ns,脉宽可调范围大约30%,验证了磁开关的后沿陡化效果以及用于脉宽调整的可行性。

The magnetic switch is used widely in the field of pulsed power technology due to its special saturation conduction mechanism,and it can be used as a pry off switch to steepen the falling edge.A high-voltage pulse quasi square wave with a certain flat top can be obtained on load based on the voltage clamping effect of metal-oxide varistor,which enables the adjustment of the pulse width by changing the volt-second integration of the magnetic switch.This paper presents a high voltage pulse generator with adjustable pulse width.With the use of varistor to generate high-voltage pulse quasi-square wave,and the magnetic switch as a pry off switch to steep the falling edge,by changing the magnetic switch reset current to control the reset depth of magnetic switch,it achieves adjustable pulse width.This paper presents theoretical analysis as well as simulation research and the preliminary experimental research based on the simulation result.In the preliminary experiment,the falling edge of the voltage waveform obtained on load is less than 30 ns and the pulse width modulation range is about 30%.