Patent ID: 8698419
Filing Date: 2014-04-15
Classification: H05B

Abstract:
1. A circuit for driving a light-emitting diode (LED) light source, said circuit comprising: a converter operable for receiving an input voltage and an input current and powering said LED light source, that comprises a switch controlled by a driving signal, and operable for providing a first sense signal indicating a current through said LED light source; a saw-tooth signal generator, coupled to said converter, operable for generating a saw-tooth signal based on said driving signal; and a controller, coupled to said converter and said saw-tooth signal generator, operable for generating said driving signal based on signals comprising said saw-tooth signal and said first sense signal to adjust said current through said LED light source to a target level and to correct a power factor of said driving circuit by controlling an average current of said input current to be substantially in phase with said input voltage.