中性束注入器抑制极电源技术研究

Research on the Technology of the Power Supply for NBI Suppressed Grid

中性束注入（NBI）器抑制极电源是中性柬电源系统的组成部分，输出电压能根据实验情况在1-5kV内可调且脉冲式输出，脉冲波形的前后沿时间不大于20μs。采用串联谐振变换技术和移相脉宽调制技术设计高压直流平台，然后使用真空四极管进行调制，满足波形上的参数需要。对有关主电路和控制方法进行了分析说明。初步实验证明该设计调整性能好，抗过载与短路能力增强，能在脉冲负载状态下运行，具有较好的NBI实验应用前景。

The power supply of Neutral Beam Injector （NBI） Suppressed grid is an integral part of the NBI power system. Its output voltage can be changed in the range of 1 to 5 kV with pulsed load based on the experimental desire, the rise time and the fall time of pulse are not more than 20 μs. The project presen- ted in the paper implement the high-voltage DC platform by the technology of phase-shifted PWM and se- ries resonant converter, and then the vacuum tetrode is applied to modulate. The main circuit topology and control method are analyzed. The preliminary experimental results show its eminent dynamic performance, and the capacity for anti-overload and short circuit proof have been enhanced, it can be opera- ted under pulsed load conditions and with better practical prospect in NBI experiment.