FAILURE DETECTION DEVICE FOR ONBOARD POWER SUPPLY DEVICE, AND ONBOARD POWER SUPPLY DEVICE

摘要

In a failure detection device, a signal output portion outputs an inspection instruction signal for instructing a plurality of abnormality detection circuits to perform an operation that is to be performed in case of abnormality, via a shared signal line. A signal distribution portion transmits the inspection instruction signal output from the signal output portion to the shared signal line to the abnormality detection circuits through a plurality of branch signal lines. A determination portion determines whether or not each of the abnormality detection circuits has failed, based ON signals output from the plurality of abnormality detection circuits when the signal output portion has output the inspection instruction signal via the shared signal line.