PFC control circuit and method

The invention discloses a PFC (Power Factor Correction) control circuit and method, and relates to the technical field of PFC control. The PFC control circuit rectifies alternating current of commercial power through an input rectifier module to obtain direct current; the input voltage sampling module is used for collecting direct current to obtain direct current voltage; an input current sampling module is used for collecting inductive current; acquiring a current output voltage under the action of the current duty ratio through an output voltage sampling module; the control module controls the second MOS tube to be switched off or switched on according to the voltage target value and the voltage set value, so that the first MOS tube or the second MOS tube correspondingly reduces or boosts the direct current voltage; according to the voltage target value, the current output voltage, the inductive current, the direct-current voltage and the current duty ratio, the duty ratio of the next moment is obtained, so