一种考虑开关暂态的电容器充电电源仿真模型

A Simulation Model of Capacitor Charging Power Supply Considering Transient Switching Interference

串联谐振式充电电源工作在高频开关状态,由电源主电路传导至测量电路、控制电路的干扰不仅要考虑开关频率干扰,也要考虑开关暂态干扰。提出了一种利用输出电流波形幅值计算谐振回路中集总参数的方法;通过列写高频变压器简化二端口网络入端阻抗方程,改进并建立了包含分布电容的高频高压变压器模型;验证了一种可模拟半导体开关反向恢复过程的数学模型,该模型通过计算器件反向恢复过程中的p区多余存储电荷,来判断反向恢复过程中的不同阶段并进行过程拟合。利用所建电源模型对工作频率为20 kHz的40 kW/10 kV充电电源开关暂态过程进行了仿真,并和充电电源样机实测数据进行了对比。模型仿真结果可良好吻合实验结果,为分析和减小高频高压充电电源传导干扰提供指导作用。

The inverter and rectifier of series resonant capacitor charging power supply （CCPS） work in high-frequency switching state, so for the electromagnetic interferences （EMI）, which flow from the main circuit of CCPS to measuring and control circuits, the switching frequency interference as well as the transient switching interference should be considered. A method to calculate the lumped parameters in resonant circuit by use of output current amplitude data is proposed： by means of writing input impedance equation of simplified two-port network of high-frequency transformer a high frequency and high voltage transformer model including stray capacitance is built and improved;a mathematical model that can simulate the reverse recovery process （RRP） of semiconductor switches is verified, and through calculating the amount of surplus storage charge in p-region during RRP of semiconductor switches this mathematical model judges different stages during the recovery process and performs process fitting. Using the built model the transient switching interference from the CCPS, whose working frequency is 20kHz, rated capacity is 40kW and rated voltage is 10kV, is simulated and simulation results are contrasted with the measured data of the prototype of CCPS. Contrast result shows that the simulation results of the built model confirm to experimental results well, so this research is available for reference to the analysis and reduction of EMI from high frequency and high voltage CCPS.