Patent ID: 7863825
Filing Date: 2011-01-04
Classification: H05B,Y02B

Abstract:
1. An LED driver circuit for providing desired luminance with constant current, said LED driver circuit comprising: a full bridge rectifier having at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, said first bridge arm and said fourth bridge arm being connected in parallel with said third bridge arm and said second bridge arm in opposite directions respectively, connection of said first bridge arm and said fourth bridge arm and connection of said second bridge arm and said third bridge arm being connected in series, said third bridge arm and said fourth bridge arm comprising a plurality of LEDs; and a constant current sink circuit coupled to a first connecting point of said third bridge arm and said fourth bridge arm, a second connecting point of said first bridge arm and said second bridge arm and a third connecting point between said LEDs of said third bridge arm.