The instantaneous overvoltages from the load side can cause damages of high-power thyristors in conventional pulsed power supply topologies, especially in cases of numerous pulse-forming units that operate together with discharge time intervals. The instantaneous overvoltages from the load side, which leads to high reverse recovery currents in high-power thyristors, can be induced by load mutations in the electromagnetic launching field. This paper establishes circuit models of PPS topologies, and investigates effects of the initial voltage of the energy-storage capacitor, the discharge time intervals, and the load resistance on the reverse recovery currents in high-power thyristors. To overcome the shortcomings of conventional PPS topologies, an improved PPS topology is developed. The improved PPS topology applies coupling inductor and resistance-capacitance snubber techniques, which can absorb the surge energy from the load side and reduce the reverse recovery currents in high-power thyristors. The simulation technique has been applied to validate theoretical analysis and the proposed model.

中文翻译：

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脉冲电源中大功率晶闸管反向恢复电流的研究

在传统的脉冲电源拓扑中，来自负载侧的瞬时过电压会导致大功率晶闸管损坏，尤其是在有许多脉冲形成单元与放电时间间隔一起运行的情况下。来自负载侧的瞬时过电压会在电磁发射场中引起负载突变，从而导致大功率晶闸管中产生较高的反向恢复电流。本文建立了PPS拓扑的电路模型，并研究了储能电容器的初始电压，放电时间间隔和负载电阻对大功率晶闸管反向恢复电流的影响。为了克服常规PPS拓扑的缺点，开发了改进的PPS拓扑。改进的PPS拓扑采用耦合电感器和电阻电容缓冲技术，可以吸收来自负载侧的浪涌能量，并减少大功率晶闸管中的反向恢复电流。仿真技术已被用于验证理论分析和所提出的模型。