Patent ID: 7852289

Claim:
A plasma display panel driving circuit that drives a plasma display panel which is a capacitive load, comprising: a pulse generating unit that generates a specified pulse voltage applied to the capacitive load; and a power recovery unit that recovers an electric power from the capacitive load by a resonance operation with the capacitive load, and supplies the recovered power to the capacitive load, wherein the power recovery unit includes: a recovery capacitor that has a capacity that is larger than a capacity of the capacitive load, and accumulates the recovered power; a recovery inductor that resonates with the capacitive load; a recovery switch element that connects the recovery capacitor to the capacitive load and a recovery inductor, and forms a channel that passes a current accompanied by a resonant operation of the capacitive load and the recovery inductor; a counterflow preventive diode that blocks a flow of current in the recovery switch element in a reverse polarity direction; and a protective diode that forms a closed current channel including the recovery inductor, the recovery switch element, and the protective diode when the counterflow preventive diode is changed from an ON state to an OFF state, wherein an anode of the protective diode is connected to a connection point of the counterflow preventive diode and the recovery switch, and a cathode of the protective diode is connected to a power source for providing a specified voltage to be applied to sustain electrodes of the plasma display panel.