Patent ID: 8513926

Claim:
A power factor correction circuit comprising: an inductor receiving an input voltage and supplying an output voltage; a power switch connected to the inductor and controlling an inductor current flowing to the inductor; and a power factor correction controller differentiating a stabilization period during which the output voltage is constantly maintained from a start-up period during which the output voltage is increased before being stabilized, controlling the switching operation of the power switch according to a first control structure during the stabilization period, controlling the switching operation of the power switch according to a second control structure during the start-up period, and controlling the switching operation of the power switch according to the second control structure during a predetermined correction delay period from a time that the stabilization period starts, the first control structure and the second control structure being different control structures, the second control structure providing a control response for the output voltage that is faster than a control response for the output voltage that is provided by the first control structure.