Patent ID: 6388429
Filing Date: 2002-05-14
Classification: G05F,H02M,Y02B,Y02P

Abstract:
For use with a power factor corrector (PFC) operable in a discontinuous conduction mode (DCM) and having a controllable switch, a controller, comprising:a current mode control circuit adapted to sense a current of said PFC and develop a current control signal based thereon; and a drive circuit adapted to drive said controllable switch, including: a voltage compensation circuit adapted to receive a signal representing an output voltage of said PFC and develop an intermediate signal therefrom, and a modulator, coupled to said voltage compensation circuit, adapted to develop a drive signal for said controllable switch based on said intermediate signal and a sum of said current control signal and a ramp signal, said drive circuit thereby capable of reducing a duty cycle of said controllable switch based thereon to reduce input current distortion in said PFC.