数字化交错并联BOOST PFC在车载充电机中的研究

Study on Digital Interleaved Parallel BOOST PFC in Vehicle Charger

为了减少电动汽车充电时对电网的谐波污染,必须对充电设备进行功率因数较正。针对3k W的电动汽车车载充电机,前级PFC电路采用了交错并联Boost PFC拓扑和数字平均电流法的双闭环控制设计方案。着重分析了主电路拓扑结构、器件设计以及数字化的控制策略。最后,通过MATLAB仿真与3.2k W样机验证,数字控制的交错并联Boost PFC电路实现功率因数为1,输出电压纹波与输入电流纹波均低于5%,满足车载充电的同时减少电网的谐波污染。

In order to reduce harmonic pollution on the grid when electric vehicle is charging, electric Vehicle Charger must have power factor correction. In terms of electric vehicle charger rated power 3 kW, the interleaved parallel Boost PFC topology and the double closed -loop control based on digital average current control were selected to carry out PFC circuit. The design process of the PFC circuit including device parameters configuration and control strategy was investigated in this paper. Finally, according to the MATLAB simulation and a 3.2kW experimental prototype, the circuit implementation power factor of the interleaved parallel Boost PFC circuit by digital control was 1, and the output voltage and input current ripple was both less than 5%, which meet the vehicle charging requirement and meanwhile reduce the harmonic pollution.