Patent ID: 9148920
Filing Date: 2015-09-29
Classification: H05B,Y02B

Abstract:
1. A light emitting diode driving apparatus configured to drive a light emitting diode load, the driving apparatus comprising: a driving circuit, coupled to the light emitting diode load, the driving circuit providing a driving voltage to one terminal of the light emitting diode load according to a pulse-width modulation driving signal; a feedback circuit, coupled to the other terminal of the light emitting diode load, the feedback circuit generating a feedback voltage according to a voltage on the other terminal of the light emitting diode load; and a control chip, coupled to the driving circuit and the feedback circuit, the control chip generating the pulse-width modulation driving signal and adjusting a duty cycle of the pulse-width modulation driving signal in response to the feedback voltage, wherein if the control chip determines that the control chip continues outputting the pulse-width modulation driving signal with a threshold duty cycle for a period of time, and the period of time exceeds a preset period of time, the control chip determines a current leakage phenomenon occurs on the light emitting diode load and stops generating the pulse-width modulation driving signal.