Patent ID: 7468875

Claim:
A power supply control device that sets a main power supply OFF when malfunctions occur to portions targeted for examination, comprising: an addressing voltage generation portion that outputs an addressing voltage to a plasma display panel and a detection unit; a sustaining voltage generation portion that outputs a sustaining voltage to the plasma display panel and the detection unit, and further outputs a specified examination voltage to the detection unit; a standby voltage generation portion that outputs a first erasing voltage, a second erasing voltage, and a scanning voltage to the plasma display panel and the detection unit; the detection unit receives the addressing voltage, the sustaining voltage, the specified examination voltage, the first erasing voltage, the second erasing voltage, and the scanning voltage, and determines if any of the received voltages have abnormal values when the main power supply is set to ON; a power switching circuit that sets the main power supply to OFF when the detection unit detects at least one abnormal value from any of the voltages and sets the main power supply to ON again after a predetermined time; and a switching control unit that controls the power switching circuit: the number of abnormal value detections that is individually set for the addressing voltage, the sustaining voltage, the specified examination voltage, the first erasing voltage, the second erasing voltage and the scanning voltage is stored in advance, and is used to determine if a malfunction has occurred in a corresponding portion targeted for examination; and if the number of abnormal values detected from one of the addressing voltage, the sustaining voltage, the specified examination voltage, the first erasing voltage, the second erasing voltage and the scanning voltage reaches the number of abnormal value detections set, the power switching circuit is prohibited from setting the main power supply to ON again after a predetermined time has elapsed since the power switching circuit set the main power supply to OFF; the addressing voltage and the number of abnormal value detections related to the sustaining voltage that are stored in the switching control unit is set to 2; the number of abnormal value detections related to the specified examination voltage, the first erasing voltage, the second erasing voltage and the scanning voltage that are stored in the switching control unit is set to a number greater than 2.