SWITCH FAILURE DIAGNOSIS DEVICE AND ELECTRIC STORAGE APPARATUS

摘要

A switch failure diagnosis device for using in a current path between an electric device and an electric storage device includes plural switches, a switch terminal voltage detector, and a controller. The switches are connected parallel to each other in the current path. The switch terminal voltage detector outputs a switch terminal voltage detection signal. The controller is configured to select the switches at different time in sequence and input an open instruction signal to each switch at the time when the switch is selected, and to determine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.

主权项

1. A switch failure diagnosis device for using in a current path between an electric device and an electric storage device, the switch failure diagnosis device comprising:
a plurality of switches connected parallel to each other in the current path between the electric device and the electric storage device; a switch terminal voltage detector configured to output a switch terminal voltage detection signal corresponding to a voltage across the switches; and a controller configured to:
select the switches at different time in sequence and input an open instruction signal to each switch at a time when the switch is selected; anddetermine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.