Patent ID: 8664884
Filing Date: 2014-03-04
Classification: H05B,Y02B

Abstract:
1. A feedback control circuit adapted for controlling a converting circuit to convert a power from a power source to drive an LED (Light-Emitting Diode) module, the feedback control circuit comprising: a feedback unit for receiving a feedback signal in response to a state of the LED module for generating a pulse width control signal, the feedback unit having a dimming adjusting unit used for generating a dimming adjusting signal according to a time sequence of a dimming signal; and a pulse width control unit for generating at least one control signal according to the pulse width control signal for controlling the converting circuit to perform power conversion operation; wherein the dimming signal is changed between a first state and a second state, and the pulse width control signal is modulated by the dimming adjusting signal within a period right after the dimming signal is changed from the second state to the first state, so as to increase a duty cycle of the at least one control signal with a predetermined value.