用于电动汽车无线充电系统的功率因数校正电路设计

Design of APFC Circuit for Wireless Charging System of Electric Vehicle

电动汽车无线充电系统在物理结构上分为地面充电桩和车载充电器两部分。地面充电桩首先将220V交流电整流为直流电,实现第一级AC/DC变换,再经高频逆变产生交流电,实现第二级DC/AC变换,最后通过松耦合变压器将电能无线传输给车载充电器,实现第三级AC/DC变换。为减小无线充电系统对电网的冲击和谐波污染,对地面充电桩的第一级AC/DC变换设计了有源功率因数校正电路,分析了功率因数校正的原理,介绍了功率因数校正电路的设计过程,仿真和实验结果表明所设计的因数校正电路有效可行。

The wireless charging system of electric vehicle is divided into two parts, one is the ground charging pile and the other is vehicle charger. The ground charging pile firstly converts 220 V AC into DC, realizes the first stage AC/DC conversion, then generates AC by high frequency inverter, realizes the second stage DC/AC conversion, and finally transmits the electric energy wirelessly to the vehicle charger through loosely coupled transformer, realizes the third stage AC/DC conversion. In order to reduce the impulse and harmonic pollution of the wireless charging system to the power grid, the active power factor correction(APFC) circuit was designed for the first stage AC/DC conversion of the ground charging pile. The principle of APFC circuit was analyzed. The design process of APFC circuit was introduced. Simulation and experimental results show that the APFC circuit is effective and feasible.