Patent ID: 7999493
Filing Date: 2011-08-16
Classification: H05B,Y02B

Abstract:
1. A primary-side driving control circuit for backlight of Liquid Crystal Display (LCD) panel, comprising: a transformer, which has a primary-side and a secondary-side, converting the energy received on the primary-side to output on the secondary-side to drive a light source module; a power switch element, which is coupled to an input power source and the primary-side of the transformer, transmitting the power from the input power source to the primary-side of the transformer; a Pulse Width Modulation (PWM) controller, which has at least one feedback control terminal and an input signal control terminal, as well as at least one output terminal, wherein the PWM controller generates output signals on the at least one output according to the signals received on the at least one feedback control terminal and the input signal control terminal; an isolation device, which has an input terminal and an output terminal, in which the input terminal receives the output signals from the PWM controller, and outputs an isolation signal on the output terminal; and a High/Low side driver, which is coupled to the isolation device and the power switch element, controlling the power switch element to transmit the energy of the input power source to the primary-side of the transformer based on the isolation signal; wherein the output terminal of the PWM controller is coupled to the input terminal of the isolation device through a diode.