Patent ID: 8040072

Claim:
A power supply for a plasma display panel (PDP), the power supply comprising: a transformer including a primary coil coupled to an input power source and a secondary coil coupled to an output terminal; a first switch coupled to the primary coil of the transformer, a duty cycle of the first switch controlling a voltage of the output terminal; first and second resistors coupled to the output terminal in series; a third resistor having a first terminal coupled to a node common to the output terminal and the first resistor; a second switch having a first terminal coupled to a second terminal of the third resistor and having a second terminal coupled to a node common to the first and second resistors, the second switch being controlled based on an accumulated driving time of the PDP; and a switching controller configured to receive a feedback voltage that varies according to an on/off state of the second switch, and configured to control the duty cycle of the first switch.