Design of power supply for pulsed magnetic window system
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摘要: 为满足脉冲磁窗技术对磁体激励电流的需求(平台期时间1~10 ms可调，最小值约24 kA)，研究了一种能量利用率高、能库小的多电容器组分时放电电源。设计了脉冲电源的拓扑结构，基于仿真分析了电源参数与电流纹波、电容器组路数之间的关系，及其对放电回路参数变化的敏感性，给出了6路电容器组分时放电的优化结构，并通过实验进行了验证。实验过程中通过晶闸管串联提高了其关断的可靠性，通过二极管三串两并的方式解决了重频模式下二极管承受反向电压能力下降的问题，进一步提高了电源放电的可靠性。Abstract: A novel pulsed power supply with high energy efficiency using multiple capacitor banks discharging sequentially is investigated to generate the demanded pulsed current (flattop time 1-10 ms, minimum 24 kA) for the pulsed magnetic window technology. The electrical topology is designed and the relationships of power supply parameters, discharging branches and current ripples as well as their sensitivities to the variation of circuit loop parameters are analyzed. An optimized structure of six discharging branches is proposed and validated by the experiments. The turn-off reliability of the main discharging switches are improved by making them in series. The ability to endure the reverse voltage of crowbar diode when turning off is enhanced by a crowbar module consisting of two branches in parallel with three tandem diodes in each branch.
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Key words:
- pulsed power supply /
- capacitor discharge /
- flattop /
- power thyristor /
- crowbar diode
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图 1 电容器组分时放电电源的拓扑结构
Figure 1. Topology of the power supply using capacitor banks discharging sequentially
图 6 输出电流对回路参数变化的敏感性分析
Figure 6. Sensitivity analysis of output current to load variation
图 7 阻尼电感对功率晶闸管电流上升率的影响
Figure 7. Influence of damping inductor on current rising rate of thyristors
图 10 某次晶闸管关断失败时的阴极电压与负载电流波形
Figure 10. Cathode voltage and load current when thyrsitor failed to turn off
图 11 降低晶闸管关断过程中反向电压峰值的措施和过流保护措施
Figure 11. Methods to reduce the reverse voltage of thyristor when turning off and overcurrent protection measure
图 12 两只晶闸管串联关断时的反向电压
Figure 12. Methods to reduce reverse voltage of thyristor when turning off and overcurrent protection measure
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