Patent ID: 8624517
Filing Date: 2014-01-07
Classification: G09G,H05B

Abstract:
1. A light emitting diode (LED) dimming drive device, comprising a plurality of dimming control circuits each comprising one dimmer switch, the dimmer switch being adapted to control a corresponding LED path to be switched on or off, the LED dimming drive device further comprising: a delay setting circuit, being configured to set a different delay time for each of the dimming control circuits; wherein each of the dimming control circuits further comprises: a clock delay circuit, being configured to receive a pulse width modulation (PWM) signal, count the time according to the delay time, and output the PWM signal to the dimmer switch when the delay time expires; each of the dimming control circuits further comprises: a first discharge suppression circuit connected with the dimmer switch, being configured to cut off a discharging circuit presented by a parasitic capacitor of the dimmer switch to the clock delay circuit when the LED path is switched off.