Patent ID: 8692476
Filing Date: 2014-04-08
Classification: H05B

Abstract:
1. A boost circuit for an LED (Light Emitting Diode) backlight driver circuit, the boost circuit having an input node, an output node, and a plurality of external power components having an inductor, a first diode, a switch, and a first capacitor, wherein the boost circuit further comprises: a PWM (Pulse Width Modulation) chip for generating a PWM signal, a VCC pin of the PWM chip coupled to the input node; a second capacitor for filtering out a direct current component of the PWM signal, one end of the second capacitor coupled to an output pin of the PWM chip; and a signal processing circuit having one terminal coupled to the second capacitor, another terminal thereof coupled to a gate of the switch, and the signal processing circuit is used to adjust the filtered PWM signal for generating corresponding high levels and low levels to the gate of the switch, for directly controlling on and off of the switch.