Patent ID: 8004285
Filing Date: 2011-08-23
Classification: B60L,G01R,H02P,Y02T

Abstract:
1. A leakage detection device of a vehicle-mounted power supply system, in which a leakage in the power supply system is detected by a leakage detection section, the power supply system comprising: a battery for a direct current; an electric power conversion circuit that converts a direct current power of the battery to an alternating current power by turning on/off a plurality of switching elements, and outputs the converted alternating current power to an AC motor; a positive line and a negative line that connect the battery and the electric power conversion circuit; and a contactor that is provided on the positive line or the negative line, wherein the leakage detection section comprises: a switching element control section that outputs a switching signal for detecting the leakage to the switching elements in the electric power conversion circuit; AC voltage applying means that applies an AC voltage to a voltage applying point on the positive line or the negative line in the power supply system; voltage measurement means that measures a voltage at a voltage measurement point located between the AC voltage and the voltage applying point; and leakage detection means that turns on all of the switching elements in the electric power conversion circuit while the contactor is turned off, and detects whether or not the leakage exists in the power supply system on the basis of a voltage value at the voltage measurement point with all of the switching elements being turned on and the contactor being turned off.