双谐振拓扑高压脉冲电容器充电电源

High voltage pulse capacitor charging power supply based on double resonant topology

脉冲电容的充电电源是脉冲功率技术中的关键设备,为研究更高精度的高压脉冲电容充电电源,基于一种较为新颖的双谐振拓扑结构,通过推导传递函数,分析了其电压和电流传输特性。根据双谐振电路存在两个谐振点的特性,提出基于双谐振变换器的充电电源充电方式,即充电阶段采用串联谐振工作模式,到高压保持阶段通过频率调制降低开关频率至接近第二谐振点,实现对脉冲电容自放电压降的动态补偿,从而保证高压充电电源充电精度的同时,极大地提高脉冲电容的高压稳定度。为验证所提出方式的可行性,基于Matlab/simulink搭建仿真模型,分别对串联谐振全桥变换器和双谐振全桥变换器两种拓扑结构进行仿真,实验结果验证了所提出双谐振拓扑的频率调制方式的可行性。

The pulse capacitor charging power supply is a key device in the pulse power technology. To study the higher precision high voltage pulse capacitor charging power supply, the paper analyzes the transfer function and its voltage and current transfer characteristics based on a novel double resonance topology. There are two resonance points in the double resonance circuit. According to this characteristic, a frequency modulation control method is proposed. That is, the charging phase and the high voltage holding phase, the first phase adopts the series resonant working mode, and the high voltage holding phase reduces the switching frequency to approach the second resonance point, thereby realizing dynamic compensation of the pulse capacitor self-discharge voltage drop, so that the charging accuracy and a large increase in high voltage stability of pulse capacitance at the same time can be ensured. Based on Matlab/simulink, the simulation model is built to verify the correctness of the frequency modulation method of the proposed dual resonance topology.