A 4 MV pre-triggered Marx generator charged with series resistor has been designed. For better output property, higher charging efficiency and lower voltage difference between stages, the study conducted the analytic solution of its constant current charging(CCC) process. The results show that the voltage differences between different stages of capacitors are in direct proportion to charging resistance, capacitance and charging speed, but are independent of time) the charging efficiency improves with time, but is independent of charging speed. This solution is universally applicable. The simulation of CCC for the Marx generator was done with PSpice, and the results agree with the analytic solution. Compared to constant voltage chargingCCVC) with 10 kΩ charging resistors, 400 nF capacitors and 10 kV/s charging speed, the charging efficiency of CCC is 90%, double that of CVC and the charging time is only one third.%设计了一种输出电压为4 MV的超前触发型Marx发生器,为了进一步优化采用电阻充电的Marx发生器输出特性,提高系统的充电效率并且减小级间充电电压不均匀性,对Marx发生器恒流充电过程进行了解析求解.结果表明:各级间充电电压差为与充电电阻、电容和充电速率成正比,与时间无关的定值,充电时间越长电压效率越高,且与电压变化率无关.该结论具有普遍适用性.结合我们设计的4 MV超前触发型Marx发生器回路,利用PSpice对Marx发生器的恒流充电过程进行了模拟,得到了自洽的结果,并且与恒压充电进行了对比.当充电电阻为10 kΩ.各级电容为400 nF.充电速率为10 kV/s时,恒流充电能量效率达到90％,约为恒压充电能量效率的2倍,充电时间为恒压充电的1/3.
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