Patent ID: 8466632

Claim:
A light emitting device (LED) device comprising: at least one LED; a triac dimmer for receiving an AC voltage and adjusting an angle of the AC voltage; a ballast for receiving the adjusted AC voltage from the triac dimmer and for generating an AC voltage pulse; a bridge diode unit for generating a DC voltage pulse to be supplied to the at least one LED by using the AC voltage pulse and such that a DC current is provided to the at least one LED; a dimming signal generator for receiving the AC voltage pulse from the ballast and for generating a pulsating dimming signal for compensating an output of the triac dimmer, wherein the dimming signal generator includes a Zener diode for limiting a pulse height of the dimming signal, and wherein the Zener diode is connected between a first output terminal of the ballast and a second output terminal of the ballast; and an LED drive controller for receiving the pulsating dimming signal and for controlling the DC current passing through the at least one LED such that the adjusted AC voltage of the triac dimmer is applied to the DC current provided to the LED drive controller for generating the pulsating dimming signal.