Patent ID: 7221334

Claim:
An energy recovery circuit of a plasma display panel including X-electrode lines and Y-electrode lines formed alternately side by side, discharging cells formed on areas where the X-electrode lines and the Y-electrode lines and address electrode lines cross each other, and a panel capacitor formed between the electrode lines, said energy recovery circuit comprising: a first controlling switch connected between the panel capacitor and a power source supplying unit and switched according to an external control signal to control the energy recovered in the power source supplying unit to be supplied to the panel capacitor; and a second controlling switch connected between the panel capacitor and the power source supplying unit and switched according to an external control signal to control the energy recovery from the panel capacitor to the power source supplying unit; a transformer connected between the first controlling switch and the second controlling switch and the panel capacitor so that resonance current flows on a primary inductor by the first controlling switch and the second controlling switch, and induced current induced by the resonance current flowing on a secondary inductor flows to a direction compensating the resonance current through the first controlling switch and the second controlling switch.