Patent ID: 8044603

Claim:
A light emitting diode driving device, the light emitting diode driving device is electrically coupled to an alternating current voltage source and a light source, wherein the alternating current voltage source outputs an alternating current voltage, the light emitting diode driving device comprising: a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source; a feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a feedback signal according to the loading state; a protection unit electrically coupled to the feedback unit to receive the feedback signal for comparing the feedback signal with a reference voltage built in the protection unit and outputting a switch signal; a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal; a timing unit electrically coupled to the alternating current voltage source to fetch the alternating current voltage and perform a synchronous operation with the alternating current voltage for outputting a timing synchronous signal; and a control unit electrically coupled to the timing unit and the protection unit to receive the timing synchronous signal and perform a modulation operation with the timing synchronous signal for outputting a timing modulation signal.