Patent ID: 8736192
Filing Date: 2014-05-27
Classification: H05B,Y02B

Abstract:
1. An apparatus for driving a light emitting diode (LED) device having a plurality of LED channels, each LED channel having a plurality of LEDs connected in series, the apparatus comprising: a power converter for converting an input voltage into an output voltage to output the output voltage to an output terminal, the output terminal connected to first terminals of the plurality of LED channels; a plurality of current controllers connected to second terminals of the plurality of LED channels, respectively, each current controller controlling a current of a corresponding LED channel; a detection controller for determining a detection time based on voltages of the second terminals of the plurality of LED channels, wherein open-circuited states of the plurality of LED channels can be detected at the detection time; and a state detector for detecting the open-circuited states of the plurality of LED channels based on voltages of the second terminals of the plurality of LED channels at the detection time.