Patent ID: 7800870
Filing Date: 2010-09-21
Classification: H02H,H03K

Abstract:
1. A power protection apparatus comprising: a switch unit connected in series in a power supply line from a power source to a DC regulator; a first short-circuit detector for detecting a short circuit based on an output voltage value of the DC regulator obtained by making the switch unit conductive for predetermined time and, after that, interrupting the switch unit; a resetting unit, when the output voltage of the power source drops to a predetermined voltage, for resetting operation of the first short-circuit detector; a second short-circuit detector for detecting a short circuit based on a value of current flowed in the switch unit when the switch unit is conductive; and a switch interrupting unit, when the short circuit is detected by the second short-circuit detector, for forcedly interrupting the switch unit regardless of a state of the switch unit controlled by the first short-circuit detector.