Design of PFC in Wireless Charging System for Electric Vehicle

A power factor correction (PFC) circuit is constructed, based on average period compensation method(APCM) in this paper. The cut-off frequency 2kHz and 10Hz are closed for current loop and voltage loop, and the phase margin of each loop is 80 degrees. By contrasting the THD of fundamental wave calculated to the 40th and the peak value of voltage ripple wave, PI values and transfer functions of both current loop and voltage loop are got. Then the input current and output voltage in PFC steady operation are simulated, and results are in accord with the small-signal model. In Simulink, the output capacitance is charged in advance and saturation controller is adopted, by which the overshoot of output voltage decreases by 6.3%, and the THD of input current is only 3.76%, which meet the demands for power-factor correction in wireless charging system for EV.