电动汽车交流充电器中PFC级的多模式控制

Multi Control Mode of PFC Stage in Alternating Current Charger for Electric Vehicle

研究一种用于电动汽车交流充电器中功率因数校正(PFC)级的多模式控制(MCM)策略。分析了所采用的交错并联Boost拓扑的工作模态及MCM策略的思想和具体实施方法。使用PSIM软件进行仿真研究。通过3.3 kW的硬件电路实验表明,采用MCM的交错并联Boost PFC级具有宽负载范围内高效的优点,变换器的峰值效率为98.2%,25%～100%负载的效率均在97%以上,尤其25%～50%负载的效率比市面上常用产品的效率高2%左右。该电路还具有输入、输出电流纹波小,电磁干扰(EMI)滤波器要求不高等特点。

A multi control mode (MCM) strategy of power factor correction (PFC) stage in alternating current charger for electric vehicles is presented.Operation modes of interleaved Boost topology utilized in this research are discussed. The idea and implementation of MCM are analyzed.The simulaiton research is analyzed in PSIM.Based on 3.3 kW hardware circuits, it is demonstrated that MCM interleaved paralleling Boost PFC features high efficiency of wide load range,with 98.2% peak efficiency and at least 97% efficiency between 25%~100% load.Especially, the efficiency between 25%-50% load is about 2% higher than normal products on market.This converter takes advantages of smaller input and output current ripple and easy electro-magnetic interference(EMI) filter design.