Patent ID: 7638954
Filing Date: 2009-12-29
Classification: H05B

Abstract:
1. A light emitting diode drive apparatus comprising: at least one light emitting diode; a choke coil; a switching drive circuit which includes a switching element and a control circuit block, the switching element determining whether a current is applied or not applied to the light emitting diode, the control circuit block controlling on/off timing of the switching element to control the current flowing into the light emitting diode; and a rectifier which supplies a back electromotive force generated in the choke coil to the light emitting diode, wherein an anode terminal of the light emitting diode is connected to a voltage source, one end of the choke coil is connected to a cathode terminal of the light emitting diode, an anode terminal of the rectifier diode is connected to other end of the choke coil, a cathode terminal of the rectifier diode is connected to the anode terminal of the light emitting diode, and the switching drive circuit is connected between the other end of the choke coil and a reference potentials, wherein the choke coil is provided in a path between the light emitting diode and the switching element not through the rectifier diode.