大功率固态调制器的仿真研究

 设计了大功率固态调制器的新型固态脉冲开关模块。通过分析电力电子仿真软件Saber中绝缘栅双极晶体管(IGBT)物理模型的概念和等效电路，结合实验数据建立了IXDH20N120型IGBT的模型，研究了Saber环境下，不同参数条件和拓扑结构对调制器电路输出特性的影响。仿真结果表明：动态均压网络在有效地保护开关的同时，可以减少IGBT的开关损耗；电路中器件离散性与系统分布参数会造成调制器输出波形质量下降，效率降低。并对调制器在负载打火情况下，因严重不均流而损坏器件故障的机理作了分析，实验证明仿真结果和分析与实际相符。

Simulation study of high power solid-state modulator

Solid state pulse switch modules are developed for high power modulator.Internal semiconductor physical process and equivalent circuit of insulated gate bipolar transistor(IGBT) are analyzed.Based on power electronics simulation software Saber and its modeling tool,physical model of discrete chip IGBT IXDH 20N120 is implemented.With this model,output performance of pulse switch modules and solid state modulator with different circuit parameters and topologies is simulated.It turns out that dynamic voltage balance network could effectively protect switch modules and reduce IGBT switch's power loss.On the other hand,random changes of trigger signal transmission delay time and stray capacitor in the circuit worsen the modulator's output pulse quality and efficiency.The modulator's damage under load arc situation is also studied.Simulation results are consistent with those of experiments.