| 摘要 |
Disclosed is a power supply device for LCD backlight converter in which a Zener diode is placed between an input of power adapter and an input of backlight converter, and a p-type MOSFET is placed between the power adapter and a cell to be used as a switch. When the power adapter provides power, the voltage level of the power is decreased by the Zener diode. When the cell provides power, the power provided to backlight converter is approximately equal to the power stored in the cell. The ratio of the input voltage of power adapter to the input voltage of the cell is decreased to extend supplying period of the cell.
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