高功率固态脉冲调制器关键技术研究

Research on the key technology of high-power solid-state pulse modulator

为了满足自由电子激光装置对于直线加速器微波功率源更新更高的性能指标,设计了基于绝缘栅双极性晶体管(IGBT)模块为开关的大功率固态调制器系统。调制器采用感应叠加拓扑结构,设计输出峰值脉冲功率13 MW,脉冲电压130 kV,脉冲电流100 A。详细介绍了大功率调制器的单元电路以及单元模块中关键的辅助电路,包括开关管的保护电路、阻尼吸收回路、去磁电路和补偿电路。利用软件对调制器系统进行模拟仿真,并对可能出现的模块差异性进行比较。结果表明,感应叠加型固态脉冲调制器技术是可行的。

Background： For construction of free-electron laser （FEL） apparatus, we designed a high-power solid-state modulator system based on the module of insulated gate bipolar transistor （IGBT） switch. Purpose： To meet the higher performance requirements of linear accelerator microwave power source for the FEL. Methods： The module circuit of the high-power modulator is introduced, as well as the critical auxiliary circuit including protection circuit of IGBT, damping circuit, demagnetization circuit and compensating circuits. Results： The whole modulator system is simulated by using software and the module differences that may occurred. The modulator with inductive adder topology can generate a 130 kV, 100A and 13 MW pulse power. Conclusions： The results show that the inductive adder pulse modulator technology is feasible.