Patent ID: 7012413

Claim:
A current-controlled frequency-modulated power factor corrector having an input that receives an input current at an input voltage and providing an output voltage at an output thereof, comprising: an electromagnetic interference (EMI) filter, coupled to said input, that receives said input current; a rectifier, coupled to said EMI filter, that provides a rectified value of said input current and said input voltage; a converter, coupled to said rectifier, that includes a power switch; and a controller that regulates said output voltage and modulates a switching frequency of said power switch, comprising: a sensing circuit that detects a sense current representative of said input current to said power factor corrector, a frequency modulation circuit, coupled to said sensing circuit, that provides a signal that causes at least one of: an increase of said switching frequency of said power switch when said input current increases, and a decrease of said switching frequency of said power switch when said input current decreases, and a pulse width modulation control circuit, coupled to said sensing circuit and said frequency modulation circuit, that supplies a drive signal to said power switch, a frequency of said drive signal being modulated as a function of said sense current and said signal from said frequency modulation circuit.