Design and Simulation of EV Charging Device Based on Constant Voltage-Constant Current PFC Double Closed-Loop Controller

摘要

Electrical vehicle has low emissions, high efficiency and other merits. In this paper, an efficient charging device program based on constant current-constant voltage charging, PFC, and Dual Closed-Loop control is proposed. Firstly, at the beginning of the charging stage, constant current charging method can keep the charging current from being too large. When the charge process comes to an end, constant voltage charging method can avoid the battery over charge. So, a constant current-constant voltage charging method is used to guarantee both the charging time and the battery working condition. And then, half-bridge isolated DC-DC converter which can achieve the function of electrical isolation and circuit switch control is presented. Secondly, to improve the charging efficiency, the main circuit takes advantage of Dual Closed-Loop control. Based on the output side of the current and voltage sampling, the information is fed back to the switch. Thirdly, PFC is added to the main circuit. It can improve the power factor of the circuit and reduce the harmonic distortion of the input current, so that the harmonic pollution caused by the charging process can be reduced. Finally, in the PSIM simulation and research on the main circuit, the simulation results show that the charging scheme has the good value of application.