基于雪崩三极管的快前沿脉冲功率源研究

Study of fast rising pulsed power generator based on avalanche transistors

雪崩三极管是一种比较理想的、同时具有快速响应和高峰值功率的器件,可以很方便地产生具有ns或亚ns上升前沿的高功率脉冲。研制了三种不同电路构型的雪崩三极管脉冲源,对比了不同级数情况下的电路输出性能,并考察了不同电缆长度对脉冲输出的影响,其中电缆储能电路的电压脉冲可以分为0.4ns快上升以及缓慢上升的阶段,而电容储能电路的电压脉冲只有0.4ns的快上升阶段,表明电缆中存在的波过程对雪崩导通过程的建立有较大影响,进而影响电路输出性能。

Avalanche transistor is a kind of ideal semiconductor device which can provide fast response and high pulse power at the same time,it can conveniently produce high power pulse with nano/subnanosecond rising edge.In this paper,three different types of circuits based on avalanche transistors are made.The performances of these circuits with different stages are compared.Besides,the effect of cable length on the pulse output is studied.The experiment results show that the pulse rising edge of circuit with cable as energy storage component can be divided into a fast rising stage(0.4ns)followed by a much slower stage,while the output of circuit with capacitor as energy storage component only has the 0.4ns fast rising stage,which indicate that the wave propagation in the cable affect the occurrence of an avalanche,therefore affecting the circuit output performance.