FAULT DETECTION CIRCUIT, FAULT DETECTION METHOD, AND POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To detect respective faults of power sources and a plurality of power conversion devices in a power supply system which supplies power from the power conversion devices connected to the power sources.SOLUTION: An input voltage and an output voltage of one power conversion device are measured after the power conversion device is disconnected from a feed bus by one of switches inserted between respective power conversion devices and the feed bus, and another power conversion device is disconnected from the feed bus by another switch, and respective input voltages and output voltages are compared with a prescribed threshold to determine which is faulty among power sources or the power conversion devices.