Abstract: An overvoltage protection power supply circuit for preventing an overvoltage from being applied directly to the flat panel display elements when the overvoltage is induced by a power supply, said overvoltage protection power supply circuit comprising a voltage regulating circuit for receiving an unregulated DC voltage and outputting a regulated DC voltage; a DC to AC voltage converting circuit for receiving the regulated DC voltage and converting the same to an AC voltage for driving flat panel display elements; a rectifying circuit for rectifying the output voltage of said inverting circuit; an overvoltage check circuit for identifying the existence of an overvoltage condition; and a switching circuit for determining a voltage on an adjusting terminal of said voltage regulating means, said switching circuit being controlled by said overvoltage check means whereby the output voltage from said DC to AC voltage converting circuit is fedback to said adjusting terminal of said voltage regulating means via said re