REVERSE-CONNECTION PROTECTION CIRCUIT AND FAILURE DETECTION METHOD FOR REVERSE-CONNECTION PROTECTION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To reduce a loss in the case that a high-voltage DC power supply is normally connected and securely protect a voltage conversion circuit in the case that the high-voltage DC power supply is reversely connected.;SOLUTION: There is provided a reverse-connection protection circuit 100 of a high-voltage DC power supply for a voltage conversion circuit CV of converting voltage between the high-voltage DC power supply HB and a low-voltage DC power supply LB. The reverse-connection protection circuit comprises: a normally open type contactor CO provided on an electric path between a positive electrode of the high-voltage DC power supply and the voltage conversion circuit; a contactor controller CC that receives power supply from the low-voltage DC power supply and, on the basis of current from the high-voltage DC power supply, performs open/close control on the contactor; a first voltage detection unit VD1 for detecting a voltage supplied to the voltage conversion circuit by the high-voltage DC power supply; a second voltage detection unit VD2 for detecting a voltage supplied to the contactor controller by the high-voltage DC power supply; and a failure detection unit for detecting a failure at the contactor on the basis of a state of the contactor's open/close control by the contactor controller and the voltages detected by the first voltage detection unit and the second voltage detection unit.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT