晶闸管关断特性在增强型轨道发射系统中的影响分析

基于一种增强型轨道炮负载特性，从机理上分析了大功率晶闸管关断特性在增强型轨道发射系统中的影响。研究结果表明，增强型轨道炮发射过程中脉冲成形网络部分电能得不到有效利用，分析原因是增强型轨道炮的初始电感较大，导轨电流具有梯形波特性，从而使发射初始阶段后膛电压具有较高的幅值，导致该阶段放电的脉冲成形单元存储的电能没有释放完全，大功率晶闸管就因承受了反向电压而关断。通过对增强型轨道炮系统仿真和发射试验验证了上述结论。根据增强型轨道发射系统中脉冲成形网络的实际状况，对剩余电能再利用的方法进行了探讨。研究结论对大功率晶闸管在增强型轨道发射系统中的工程应用具有指导作用。

Analysis on the Influence of Turn-off Characteristics of Thyristor on Augmented Railgun

Based on the load characteristic of an augmented railgun, the influence of turn-off characteristics of high power thyristor is analyzed. The research shows that part of electric energy in pulse forming network cannot be used effectively in the process of launching experiment. The major reason is that the initial inductance of augmented railgun is larger and the rail current is of trapezoidal wave. Thus the breech voltage of augmented railgun is higher at the initial phase of launch, leading to the situations when the high power thyristor is shut off due to reverse voltage and the stored electric energy of pulse forming unit is not released entirely during discharging. The above conclusions are verified by the simulation and experiment of augmented railgun. According to the actual state of the pulse forming network in augmented railgun, the reuse of remaining energy is discussed. The research conclusion has a guiding role for the application of high power thyristor in augmented railgun system.