Control device for an onboard power supply unit and onboard power supply device

摘要

The present invention enables the supply of current based on a current storage unit located further toward a low-voltage side than a predetermined position in a vehicle-mounted power supply unit to a low-potential side path even if an abnormality continues to occur on the high-potential side than the predetermined position. A vehicle-mounted power supply unit control apparatus (2) has a bypass conduction path (72) serving as a path for supplying power from a first position (P1) between power storage units in a vehicle-mounted power supply unit (91) to a second conduction path (82). a bypass relay (74) interposed within the bypass line path (72), and a protective relay (54) disposed between current storage units at a position further high potential side than the first position (P1). , is arranged. A control unit (20) switches between a first switching control for switching on the protective relay '(54) and switching off the bypass relay' (74) and a second switching control for switching off the protective relay '(54) and turning on the bypass relay '(74) um.