主要探讨了夹断开关对“荧光-1”实验装置输出电流特性的影响，利用Pspice软件对其在装置中起到的作用进行功能建模并分析其参数影响，同时开展初步调试实验并分析多组夹断开关导通性能及其同步性对负载电流的影响。仿真与实验结果表明：夹断开关可有效改善负载电流脉宽，可使脉宽从原有3 μs展宽至100 μs，其导通电阻与电感参数均能明显影响电流幅值与脉宽。由实验波形结合仿真可知，夹断开关实际导通电阻约4 mΩ,两支路耦合电感分别约为60，125 nH，调试结果验证了夹断开关功能建模的正确性及其对脉宽展宽的有效性。

“Yingguang-1” is a multi-bank program-discharged pulsed power device to investigate the formation, confinement and instability of the high temperature and high density field reversed configuration (FRC) plasma injector for the magnetized target fusion (MTF), which was constructed at the Institute of Fluid Physics (IFP) in 2014. This paper discusses the influence of the crowbar switch on the load current in “Yingguang-1” device by function modeling the crowbar switch with the software Pspice and conducting the preliminary test experiment. The function circuit modeling of the crowbar switch employed in the program-discharged power system, is accurately presented for the first time. The simulation and experiment results show that the crowbar switch can improve the load current’s duration effectively and both its closed resistance and inductances can affect the load current’s amplitude and duration obviously. As the closing resistance decreases, the current’s duration becomes broader, however, the current’s amplitude remains the same. As the coupling inductance connecting to the theta pinch main power system decreases, the duration becomes broader. The approximate 4 mΩ closing resistance and 60 nH with 125 nH coupling inductances in the actual crowbar switch have been determined by the simulation based on the measured current. The test results prove that the function modeling of the crowbar switch is correct and it broadens the current duration effectively.