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为了提高兆瓦级中性束注入器束流引出成功率及品质,利用IGBT能快速开关及其高载流能力的特点研制了全固态抑制极电源。该电源主要由10个500 V/20 A的模块电路依次串联组成,每个模块由隔离变压器、整流滤波、IGBT管及其驱动电路、续流二极管及辅助供电组成。各模块间通过光纤由嵌入式系统STM32实现参数设置、控制和保护监测。同时对抑制极电源与加速极电源及三电极加速器之间的连接及保护方式进行分析,在极间打弧状态,并满足最小抑制时间13 ms的情况下,优化计算得到储能电容最小值为500μF及串接保护电阻为200?。通过测试,可得电源单独输出电压达到5 kV,峰值电流40 A,能在20μs内快速保护关断。同时在中性束引出系统中使用新旧抑制极电源开展对比实验,结果表明:全固态抑制极电源束流引出成功率增加20%以上,达到系统设计要求。
In order to improve the success rate and quality of the MW-class neutral beam injector, an all-solid-state suppressor power supply was developed by using IGBT’s fast switching and its high current carrying capacity. The power supply is mainly composed of 10 500 V / 20 A module circuits in series. Each module is composed of isolation transformer, rectifier filter, IGBT tube and its driving circuit, freewheeling diode and auxiliary power supply. Each module through the optical fiber embedded system STM32 parameter settings, control and protection monitoring. At the same time, it analyzes the connection and protection mode of the pole power supply, the accelerating pole power supply and the three-electrode accelerator, and in the case of arc between poles and the minimum inhibitory time of 13 ms, the minimum value of the storage capacitor is 500μF and series protection resistance of 200 ?. Through the test, the output voltage of the power supply alone reaches 5 kV and the peak current is 40 A, which can quickly protect the switch-off within 20 μs. At the same time, a contrast experiment was carried out on the neutral beam extraction system using both old and new suppression pole power supply. The results show that the success rate of all solid state suppression pole power beam extraction increased by more than 20%, which meets the system design requirements.