PURPOSE: A power supply device for a plasma display panel which transfers surplus power source to a power supply part are provided to stably supply surplus power source regardless of a reset period, address period and sustain period. CONSTITUTION: A power source converting portion(110) changes a commercial AC source into a fixed DC power supply. The first power source feed port(120) switches the DC power supply and supplies the fixed drive power. The first power source feed port comprises a fixed inductance. A driving part(130) switches the drive power and supplies to the plasma display panel.
