Design of all-solid-state modularized Marx circuit and synchronous combining of pulses
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摘要: 选用雪崩三极管作为开关器件，详细讨论了设计和优化Marx电路的方法；将Marx电路进行模块化改进，设计了一种新型四路同步叠加立体结构，并得出了叠加倍数与模块数量的理论关系式。最终，利用+300 V直流电源供电，通过四路输出幅值为-2.6 kV的Marx模块叠加，在50 阻性负载上得到了幅值-5.0 kV、半高脉宽5.3 ns、脉冲能量约2.0 mJ的高斯型脉冲，时延抖动小于100 ps，重复频率达10 kHz，叠加效率达96.2%。调节直流偏置电压为200~300 V，并配合模块数量的增减，可调节脉冲幅值为1.6~5.0 kV。Abstract: In this paper, utilizing avalanche transistors as switching devices, the methods of designing and optimizing Marx circuit were discussed in detail. Modular improvement was implemented to the Marx circuit and a novel stereo structure of synchronous four-module combining was designed. The theoretical relation of the combining ratio and the combined modules were derived. Using a +300 V DC power and combining four -2.6 kV Marx modules, Gaussian pulses were obtained on a 50 resistive load with -5.0 kV magnitude, 5.3 ns half peak width, 2.0 mJ single-pulse energy. It was realized to stably work under a repetitive frequency of 10 kHz and the time delay jitter was measured less than 100 ps. The four-module combining efficiency was calculated up to 96.2 %. If changing the DC bias voltage between 200 V and 300 V and varying the number of combined modules, the final output magnitude would be regulated from 1.6 kV to 5.0 kV.
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