Converter fault detection device and converter fault detection method

摘要

PROBLEM TO BE SOLVED: To provide a converter failure detection device that can detect a failure of a converter by positively producing a situation to detect the failure of the converter.SOLUTION: A control device 40 detects a failure of a switching element Q1 of an upper arm side based on a voltage VL and a voltage VH by making the voltage VL and the voltage VH the same by turning off a switching element Q2 of a lower arm side, while turning on the switching element Q1 of the upper arm side, when a vehicle has stopped, afterwards turning off the switching element Q1 of the upper arm side and the switching element Q2 of the lower arm side, and in addition turning off system relays SMRB and SMRG, and operating afterwards a DC/DC converter 30.