Patent ID: 8581508
Filing Date: 2013-11-12
Classification: H02M,H05B,Y02B

Abstract:
1. An light emitting device (LED) driving apparatus comprising: a light emitting unit having at least one LED; a rectifier rectifying an alternate current (AC) voltage applied from external power; a power supply unit supplying driving power to the light emitting unit, and having an inductor connected to an output terminal of the light emitting unit; a switch controller receiving a voltage outputted from the rectifier to generate a reference voltage in proportion to the voltage outputted from the rectifier, and comparing the reference voltage with an input voltage generated by detecting a current flowing in the inductor, and controlling an on or off operation of a switch so as to proportion a waveform connecting peaks of the current flowing in the inductor to a waveform represented from the input voltage by turning the switch off at a point of time at which the voltages coincide with each other; and a switch connected to the switch controller to control power inputted from the light emitting unit.