Patent ID: 7358932

Claim:
A driving circuit of a plasma display panel comprising: a panel capacitor having an X-side and a Y-side; a voltage clamping circuit comprising: a first switch having a first end coupled to a first voltage source and a second end coupled to the X-side of the panel capacitor; a second switch having a first end coupled to a second voltage source and a second end coupled to the X-side of the panel capacitor; a third switch having a first end coupled to a third voltage source and a second end coupled to the Y-side of the panel capacitor; a fourth switch having a first end coupled to a fourth voltage source and a second end coupled to the Y-side of the panel capacitor; and an energy recovery unit coupled between the X-side of the panel capacitor and the Y-side of the panel capacitor for charging and discharging the panel capacitor, the energy recovery unit comprising: a variable voltage source; a fifth switch having a first end coupled to the X-side of the panel capacitor and a second end coupled to the variable voltage source; a sixth switch having a first end coupled to the second end of the fifth switch and a second end; a seventh switch having a first end coupled to the Y-side of the panel capacitor and a second end coupled to the second end of the fifth switch; a first diode having an anode coupled to the X-side of the panel capacitor and a cathode coupled to the second end of the sixth switch; and a second diode having an anode coupled to the Y-side of the panel capacitor and a cathode coupled to the second end of the sixth switch; wherein the fifth switch provides an energy-forward current path for the X-side of the panel capacitor, the sixth switch and the first diode provide an energy-backward current path for the X-side of the panel capacitor, the seventh switch provides an energy-forward current path for the Y-side of the panel capacitor, and the sixth switch and the second diode provide an energy-backward current path for the Y-side of the panel capacitor.