Development of dual front-stage voltage fast pulsed power supply
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摘要: 针对强流重离子加速器装置（HIAF）离子源束流快速切换需求，设计并研制了一台快切束脉冲电源。根据兼顾电流快速变化和平顶稳定度的要求，提出了基于高低压双前级电压快切换的实现方案，分析了电路工作原理，计算了关键参数，讨论了适应电压突变的控制方法。根据电源模块化原则研制了16 kW整机并在真实磁铁负载进行了测试。结果表明，电源在13 mH电感上输出570 A，误差小于±1×10−4，重复频率3 Hz，上升下降时间小于30 ms，平顶900 ms内可调，电源设计方案合理可行。Abstract: A fast pulsed power supply is developed to meet the requirements of High Intensity heavy-ion Accelerator Facility (HIAF) ion source. Based on front-stage voltage fast switching method, we proposed a circuit topology ensuring fast rising of current and flat top stability. In this paper the circuit is analyzed, the essential parameters of the circuit are calculated, and the control method is established for adapting abruptly-changed voltage. A 16 kW power supply based on the principle of modular manufacturing was tested on real magnet load. The results show the value of flat top current reaches 570 A, the error is less than ±1×10−4, the repetition frequency reaches 3 Hz, the rise time and fall time is less than 30 ms, the flat top time can be set within 900 ms.
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Key words:
- fast switching /
- pulsed power supply /
- front-stage voltage /
- abrupt-changed /
- modularized
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图 3 快切束电源输出电流和负载两端电压波形示意图
Figure 3. Output current and voltage diagram of fast switching power supply
图 5 切换点低压回路与高压回路示意图
Figure 5. Schematic diagram of low voltage loops and high voltage loop at switch point
图 8 570 A平顶阶段300 ms电流误差
Figure 8. Error of output current during 300 ms flat top time at 570 A
表 1 HIAF ECR 90度磁铁切束电源设计指标
Table 1. Specifications of HIAF ECR 90° magnet power supply
maximum
current/Arise
time/msflat top
time/msfall
time/msflat top
errorfrequency/
HzDC output
power/kWload resistance/
mΩload inductance/
mH570 ＜30 100～900 ＜30 ＜±1×10−4 ＜3 ＜16 48.8 13 
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表 2 设计指标与测试结果对比
Table 2. Comparative analysis of power supply parameters
maximum current/A rise time/ms flat top time/ms fall time/ms flat top error frequency/Hz DC output power/kW design 570 ＜30 100～900 ＜30 ＜±1×10−4 ＜3 ＜16 test result 570 25.4 100～200 21.8 ＜±9.26×10−5 1～3 ＜15.8
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