Patent ID: 8884538
Filing Date: 2014-11-11
Classification: H05B,Y02B

Abstract:
1. A light-emitting diode (LED) driving circuit for driving at least one LED, the LED driving circuit comprising: a power factor correction (PFC) circuit for controlling a power factor of the LED driving circuit, the PFC circuit at least comprising: an inductor, a first end of the inductor being connected to a positive end of a power supply source, the inductor being configured to extract an inductor current and providing energy to at least one LED; a switch connected to a second end of the inductor, the switch being conducted according to a driving signal; a current detection circuit connected to the switch for detecting a inductor current information; and a time detection circuit connected to the switch for detecting an energy discharging time during which the inductor current decreases to zero from the peak value; and a driving controller connected to the switch, the current detection circuit, and the time detection circuit, the driving controller being configured to output the driving signal to the switch according to the inductor current information and the energy discharging time.