Patent ID: 8531128
Filing Date: 2013-09-10
Classification: H05B,Y02B

Abstract:
1. A light emitting diode driver for driving a plurality of color strings each having at least one light emitting diode, wherein the plurality of color strings are coupled in series, and wherein the plurality of color strings is coupled to a power supply, the driver comprising: a plurality of capacitors, wherein at least one capacitor is coupled in parallel to each one of the plurality of color strings; a plurality of inductors; and a plurality of switches, wherein each of the plurality of switches is coupled to a first one of the plurality of inductors through a first terminal of the switch and coupled to a second one of the plurality of inductors through a second terminal of the switch, wherein each set of one switch and at least two inductors is further coupled in parallel to one of the plurality of color strings, and further wherein the first terminal of each of the plurality of switches is coupled to the power supply through a first diode, and the second terminal of each of the plurality of switches is coupled to ground through a second diode, wherein each switch is configured to shunt power away from a corresponding one of the plurality of color strings in parallel with the switch and return at least a portion of the shunted power through the first diode back to the power supply at a node between the power supply and a voltage supply; and a controller configured to provide control signals to the plurality of switches to route power among the plurality of color strings to obtain a desired output color from the plurality of color strings.