Patent ID: 8085021
Filing Date: 2011-12-27
Classification: H02M,Y02B

Abstract:
1. A switching controller for a power factor correction converter, the switching controller comprising: a switching-control circuit for generating a switching signal; a current-command circuit for receiving a line-effective voltage, a line-reference current, a first error signal, and a sense voltage to provide a second error signal to said switching-control circuit; a light-load detection circuit coupled to said switching-control circuit for generating a power-saving signal by detecting said first error signal; a programmable feedback circuit coupled to said light-load detection circuit for generating a programming current in response to load conditions of said power factor correction converter; a modulator coupled to said light-load detection circuit for generating said first error signal; and an over-voltage detection circuit coupled to said programmable feedback circuit and said modulator for modulating said first error signal and coupled to said switching-control circuit for disabling said switching signal.