Patent ID: 9692294
Date: 2017-06-27
CPC Classifications: H02M,Y02B,Y02P

Claim:
1. A control circuit in a power factor correction circuit, comprising a voltage sampling module, an output feedback module, a multiplier, a waveform generation module, a control signal generation module, and a drive control module, wherein: the voltage sampling module is configured to sample an input voltage Vdc of the power factor correction (PFC) circuit, and output a voltage sampling signal Vs; the output feedback module is configured to sample an output electric parameter of the PFC circuit, compare a sampled output electric parameter with a pre-set value, and output a feedback signal Vf according to a comparison result; the multiplier is configured to multiply the voltage sampling signal Vs by the feedback signal Vf, and output a first signal I the waveform generation module is configured to generate a second signal I the control signal generation module is configured to output a control signal according to a current sampling signal Is of a main switch of the PFC circuit, the first signal I the drive control module is configured to drive the main switch according to the control signal output by the control signal generation module, and control a conducting duration of the main switch.