Patent ID: 8704451
Filing Date: 2014-04-22
Classification: H05B

Abstract:
1. A driving circuit of a light emitting diode (LED), comprising: an alternating current (AC) power, having a first end and a second end, and providing an AC signal through the first end and the second end; a rectifier, having a third end, a fourth end and a fifth end, wherein the third end and the fourth end are respectively coupled to the first end and the second end, and the rectifier outputs a driving signal through the fifth end; a power converter, having a sixth end coupled to the fifth end, and the power converter comprising an LED, and outputting a first signal positive correlated with a current passing through the LED through a seventh end; a waveform sampler, having an eighth end and a ninth end, wherein the eighth end is coupled after the AC power and before the rectifier, and the waveform sampler outputs a second signal directly proportional to the AC signal through the ninth end; and a control circuit, having a tenth end, and coupled between the ninth end of the waveform sampler and the seventh end of the power converter, and outputting a control signal to the power converter through the tenth end.