Patent ID: 9035560
Filing Date: 2015-05-19
Classification: H05B

Abstract:
1. An LED (Light-Emitting Diode) driving control circuit for controlling a converting circuit to convert a power from a power source into an output voltage to drive an LED module which has a plurality of LED strings, the LED driving control circuit comprising: a voltage detecting circuit comprising a plurality of detection circuits, wherein each of the detection circuits is coupled to a terminal of a corresponding LED string in the LED module for determining whether the terminal is higher than or lower than a preset value, thereby generating a determination result, and each of the detection circuits generates a feedback signal in response to the determination result; and a feedback control circuit controlling the converting circuit to modulate the output voltage according to the feedback signal, wherein each of the detection circuit comprises a switch, a current source and a waveform modulation circuit, and the switch is coupled with the current source in series, and a control end of the switch is coupled to the terminal of the corresponding LED string, and an input end of the waveform modulation circuit is coupled to a connecting node between the switch and the current source and generates the feedback signal at a first logical level or a second logical level in response to that a state of the switch.