为回旋行波管设计了全固态近方波Marx高压脉冲调制器, 设计参数: 输出电压70 kV, 输出电流15 A, 工作频率0~2 kHz可调, 脉宽200 μs可调, 功率容量可以达到百kW级。设计利用串联IGBT作为控制开关, 利用FPGA通过光纤传输的方式对IGBT进行逻辑控制、电路保护和监测, 补偿单元利用FPGA控制IGBT自动补偿的方式对顶部压降进行补偿, 使得输出电压平顶度达到±1%。对电路各个部分进行仿真及测试。结果验证此设计方案的可行性, 可以提高回旋管电源的稳定性和工作频率, 减小调制器体积及维护成本, 并为高压测试提供了实验基础。

This paper designs a high voltage rectangle pulse Marx modulator for gyro-TWT. The output voltage is 70 kV, the output current is 15 A, the frequency could be changed in 2 kHz, the pulse width could be changed in 200 μs and the power capacity is up to hundreds kW level. The Marx modulator takes two IGBTs in series as the controlling switches. The FPGA board is used in controlling the switches and protecting and monitoring circuits. The delay compensation circuits are also controlled automatically by FPGA board and make the output pulse flat-top ±1%. The prototype simulation and experiments of solid-state Marx modulator have been completed and proved the feasibility of the design. The result is useful to provide a stable and high frequency rectangle pulse, reduce the volume and the maintenance charge and be the foundation of high voltage experiments.