Abstract:

The charging characteristic of the capacitor charging power supply was analyzed with practical series resonant topology. The method that setting two current taps and regulating PWM switching frequency was putted forward with close loop controlling algorithm to charge the multi-group capacitor banks with constant current. A capacitor charging power supply with the max output current 6.5A and the max output voltage 2000V is designed. Experimental results show that, this power supply can charge the four capacitor banks to any four different voltages in 1 minute with charging accuracy less than 1%, and meet the requirements of J-TEXT ohmic field power system.

Key words: Constant current charging, Series resonant, CCPS

摘要：

分析了实际串联谐振电容充电电源的充电特性，提出通过设置两个电流档位，闭环调节PWM开关频率，实现了对多组电容器组恒流充电。设计了最大输出电流为6.5A，最大输出电压为2000V的电容充电电源。测试结果表明，该电源可以在1分钟内将四组电容器组同时充至2000V以内不同的任意电压，充电精度小于1%，能够满足J-TEXT加热场电源运行需求。

关键词: 恒流充电, 串联谐振, 电容器充电电源