Patent ID: 7518317
Filing Date: 2009-04-14
Classification: H05B

Abstract:
1. A backlight driving and control circuit with an isolated power factor correction structure, for driving and controlling the operation of a light emitting component, comprising: a power stage, for providing a power supply; a driver stage, having a first power factor correction unit for correcting a power factor of said power supply and outputting a DC power and an inverter for converting said DC power into a high-voltage power output and driving the operation of said light emitting component, and said inverter and said first power factor correction unit constitute a circuit structure of an electric isolation without being grounded jointly; and a control/dimming stage, having a second power factor correction unit, a DC transformer unit, and an AD board, and said second power factor correction unit, said primary winding of said DC transformer unit and said first power factor correction unit constitute a circuit structure grounded jointly, and said power stage forms a circuit structure of an electric isolation, and said AD board is installed at a secondary winding of said DC transformer unit and constitute a circuit structure jointly grounded with said inverter, for directly controlling and dimming said inverter of said driver stage, and dimming said light emitting component and controlling the ON/OFF of said light emitting component.