Patent ID: 8847511
Filing Date: 2014-09-30
Classification: H05B,Y02B

Abstract:
1. A light emitting diode (LED) driving circuit, suitable for driving an LED load, comprising: an AC voltage source, providing an AC voltage; a bridge rectifier, coupled to the AC voltage source and configured to rectify the AC voltage so as to generate a corresponding DC voltage between a first output terminal and a second output terminal of the bridge rectifier; a first and a second diodes, wherein a cathode terminal of the first diode and an anode terminal of the second diode are jointly coupled to the first output terminal of the bridge rectifier; a first, a second and a third inductors, wherein a first terminal of the first inductor and a second terminal of the second inductor are jointly coupled to the second output terminal of the bridge rectifier, a second terminal of the first inductor is coupled to a cathode terminal of the LED load, a first terminal of the second inductor is coupled to an anode terminal of the first diode, a first terminal of the third inductor is coupled to a cathode terminal of the second diode, and a second terminal of the third inductor is coupled to an anode terminal of the LED load; a first and a second transistors, wherein a gate of the first transistor and a gate of the second transistor respectively receive a first control signal and a second control signal, a second source/drain of the first transistor and a first source/drain of the second transistor are jointly coupled to the first output terminal of the bridge rectifier, and a second source/drain of the second transistor is coupled to the cathode terminal of the LED load; and a first and a second capacitors, wherein a first terminal of the first capacitor is coupled to a first source/drain of the first transistor, a first terminal of the second capacitor is coupled to the anode terminal of the LED load, and a second terminal of the first capacitor and a second terminal of the second capacitor are jointly coupled to the cathode terminal of the LED load.