Abstract:

The hardware design of solid-state anode high-voltage power supply in electron cyclotron resonance heating system (ECRH) is presented. The anode power supply uses the method that combined high-frequency pulse width modulation (PWM) and phase shift modulation (PSM) control technology. The former in the supply uses the SG3525 to control the IGBT to complete the high frequency invert. The latter is made up of a total of 59 modules connected in series. The output voltage of each module is basically stabilized by feedback of the first stage module output voltage. DSP controls the number of PSM module on and off and the 59th module BUCK circuit duty cycle to achieve the output voltage of the superimposed output, and the output voltage can be adjusted within the full range of 35kV with accuracy less than 0.1kV, the output current up to 200mA, modulation frequency more than 1kHz. The anode power supply has three operating modes, and the rising edge time of the waveform can be adjusted within 3ms. The results tested from dummy load and ECRH experimental platform show that its performance is stable, and the hardware design method is feasible.

Key words: Gyrotron, Electron cyclotron resonance heating, Pulse step modulation, High voltage power supply, Hardware circuit

摘要：

介绍了电子回旋共振加热(ECRH)系统中全固态阳极高压电源的硬件设计方法。阳极电源采用高频PWM和PSM控制技术相结合的方法。前级使用SG3525来控制IGBT完成高频逆变，后级由59个模块串接输出而成，通过反馈第一级模块输出电压，实现每个模块输出电压的基本稳定；后级输出电压通过DSP控制PSM模块的通断个数以及第59个模块BUCK电路的占空比，实现输出电压的叠加输出，让输出电压能在35kV内全范围调节，输出电流最大为200mA，调制频率达1kHz以上。输出波形有3种工作模式，波形前沿时间能在3ms内调节。经过在假负载及ECRH实验平台上的测试，电源性能稳定，证明该硬件设计方法可行。

关键词: 回旋管, 电子回旋共振加热, 脉冲步进调制, 高压电源, 硬件电路