Patent ID: 8519642
Filing Date: 2013-08-27
Classification: H05B

Abstract:
1. An LED light emitting device including a plurality of LED channels including a plurality of LEDs, comprising: a transformer configured to convert an input voltage and supply an output voltage to the plurality of LED channels; a controller configured to control the transformer according to a first feedback signal for interrupting power supply to the plurality of LED channels when a dimming off state in which currents are not supplied to the plurality of LED channels occurs or when a state in which the maximum channel voltage of a plurality of channel voltages corresponding to voltages applied to the plurality of LED channels, respectively, is an overvoltage and a defective state in which the plurality of LED channels include an open state are maintained during a predetermined threshold period; and an LED driver configured to generate information on the dimming off state and information on the defective state, the LED driver comprising a first feedback signal generator that includes a first photo diode emitting beams corresponding to a first sink current and a second sink current, and a first photo transistor in which a current corresponding to an amount of beam emitted by the first photo diode flows, wherein the LED driver is connected to a secondary side of the transformer, the controller is connected to a primary side of the transformer insulated from the secondary side, and the first feedback signal is generated according to the information on the dimming off state and the information on the defective state.