带截尾开关的高频纳秒脉冲功率源设计

Design on High-frequency Nanosecond Pulse Power Source with Truncated Switches

为了获得具有快速上升、下降沿的高频纳秒脉冲,对传统雪崩单管电路的改进电路进行了试验,验证了改进电路能加快充电速度的可行性。设计了两种10级Marx型纳秒级正脉冲发生器,发生器采用磁环隔离的驱动方案,主电路拓扑结构中采用二极管代替传统Marx电路中的所有电阻。在100Ω的阻性负载下进行放电实验,最终重频工作状态下输出峰值上千伏的纳秒脉冲,输出端负载加截尾开关后脉冲的下降沿缩短至3 ns。实验结果表明,改进后的发生器有更高的输出幅值和工作频率,磁环隔离的驱动方案确保了每级雪崩管同时触发导通并且产生具有纳秒上升沿的快脉冲,二极管替代传统Marx电路的所有电阻加快了电容的充电速度、提升了脉冲发生器的工作效率,负载并联截尾开关后脉冲后沿更快,实验结果良好。

In order to obtain a high-frequency nanosecond pulse with a fast rising and falling edge, the traditional avalanche single-tube pulse circuit was tested and the feasibility of this circuit was verified to speed up the charging speed. Designing two ten-stage nanosecond Marx type generator with positive pulse, the driving scheme of generator was that magnetic rings were used to isolate, in the topological structure of the main circuit, diodes were used to instead of all resistors which were used in traditional Marx circuit. The discharge experiment was carried out under a resistive load of 100Ω. Finally, the output voltage of the high-repetition nanosecond pulse reaching 1 kV, the output of the load in parallel truncated switches could further shorten the falling edge of the output pulse to 3ns. The experimental results show that the improved generator has higher output amplitude and operating frequency, the driving scheme of generator is using magnetic rings to isolate, thus ensures each avalanche transistors to trigger simultaneously and produce fast pulse with nanosecond rising edge. Diodes which are used to replace all resistors have accelerated the charging speed and improved the working efficiency of the pulse generator, the falling edge is faster when the output of the load in parallel truncated switches, the experimental results are good.