Patent ID: 8823285

Claim:
A device comprising: a power supply; a light emitting device; and a boost converter having an input node electrically coupled to the power supply and having an output node, with the light emitting device electrically coupled between the output node and a reference node, wherein the boost converter comprises, a switch electrically coupled in a current shunting path between the input node and the reference node, wherein the switch is configured to shunt current from the power supply around the light emitting device, and a controller configured to control a duty cycle of the switch to provide a pulse width modulated electrical current through the switch and a continuous electrical current through the light emitting device, wherein the controller is configured to control the duty cycle of the switch to provide the pulse width modulated electrical current as a pulsed current through the switch while providing the continuous electrical current through the light emitting device as a non-pulsed current through the light emitting device.