A power factor correction circuit in the control circuit

The present invention provides a control circuit of a power factor correction circuit, comprising: a multiplier for multiplying the voltage sense signal Vs and the feedback signal Vf, and outputs a first signal I1; the waveform generating circuit produces a filtered the second signal I2 capacitive current associated, and the second signal I2 and the current sense signal is PFC main switch to generate a control signal for controlling the main switch state by the first signal I1. To the input current Ip PFC circuit and a total filtering current Ic sum and by controlling the main switch is turned on and off, i.e., alternating phase of the input current Iin and the input voltage Vin side of the same, so as to eliminate the phase filter capacitor caused difference, resulting in a phase Iin and Vin is not the same.