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在Marx脉冲功率发生器中,开关是最重要的组件,其特性直接影响输出脉冲上升沿。提出一种利用BJT(Bipolar Junction Transistor)集电极与发射极间的雪崩击穿特性的新型开关器件代替传统开关的方法,可实现Marx输出上升沿小于5ns的脉冲电压,可代替传统Marx发生器中的气体开关。介绍不同型号的BJT集电极与发射极间雪崩击穿特性,根据实验结果,以适合小型Marx发生器的BJT开关特性为主要依据选用合适的BJT。目前没有雪崩击穿的仿真元件,只能用PSPICE建立BJT的集电极与发射极间击穿仿真模型代替实际BJT的雪崩击穿,并以此来辅助Marx脉冲发生器的设计。
In the Marx pulse power generator, the switch is the most important component, its characteristics directly affect the output pulse rising edge. A new switching device using avalanche breakdown characteristics between collector and emitter of BJT (Bipolar Junction Transistor) instead of the traditional switch can be achieved pulse output voltage is less than 5ns Marx output pulse can replace the traditional Marx generator Gas switch. The avalanche breakdown characteristics between different types of BJT collector and emitter are introduced. Based on the experimental results, the suitable BJT is selected based on the BJT switching characteristics of a small Marx generator. At present there is no avalanche breakdown of the simulation components, only the establishment of PSPICE BJT collector and emitter breakdown simulation model instead of the actual BJT avalanche breakdown, and in order to complement the Marx pulse generator design.