Muncy, Geissler, Olds & Lowe, PLLC
Backlight driving and control circuit with an isolated power factor correction structure
A backlight driving and control circuit with an isolated power factor correction structure includes a power stage for providing a power supply; a driver stage having a first power factor correction unit for correcting the power factor of the power supply and outputting DC power; an inverter for converting a middle-voltage DC power into a high-voltage power output and driving the operation of a backlight light emitting component; and a control/dimming stage having a second power factor correction unit, a DC transformer unit, and an AD board installed at a secondary winding of the DC transformer unit and grounded jointly with the inverter. With the invention, the power factor correction unit can be electrically isolated from the power stage, and the AD board can directly control/dim the inverter of the driver stage to change the operating status of the backlight light emitting component.
Zippy Technology Corp.
H H
H05B H05B
additional inventional
Ying-Nan Chin-Biau Chin-Wen
Cheng Chung Chou