Patent ID: 7057440
Filing Date: 2006-06-06
Classification: H02M,Y02B,Y02P

Abstract:
1. A multiplier-divider circuit for a PFC controller, comprising: a first multiplier-input terminal, for accepting a first multiplier signal; a second multiplier-input terminal, for accepting a second multiplier signal; a divisor-input terminal, for accepting a divisor-signal; a constant current source, for providing a constant current; a pulse generator, for generating a pulse-signal, an inversed pulse-signal, a sawtooth-signal, a sample-signal and a clear-signal; a first multiplier-divider stage, having a first input, a second input, a third input and an output, wherein said first input of said first multiplier-divider stage is connected to said first multiplier-input terminal, said second input of said first multiplier-divider stage is connected to said constant current source, and said third input of said first multiplier-divider stage is coupled to said divisor signal; a second multiplier-divider stage, having a first input, a second input, a third input and an output, wherein said first input of said second multiplier-divider stage is connected to said output of said first multiplier-divider stage, said second input of said second multiplier-divider stage is connected to said second multiplier-input terminal, and said third input of said second multiplier-divider stage is coupled to said divisor signal; and an output terminal, connected to said output of said second multiplier-divider stage.