Abstract: In a vehicle power-supply system, a backup power-supply device includes a low-voltage DC/DC converter, a backup battery, and switching mechanisms. A bidirectional switch unit is provided between a high-voltage DC/DC converter and a connecting point on a connecting wire and passes or interrupts a current flowing between the high-voltage DC/DC converter and the connecting point. A bidirectional switch unit is provided between the connecting point and a connecting point on a connecting wire and passes or interrupts a current flowing between the connecting point and the connecting point. A unidirectional switch unit is provided between the connecting point and the low-voltage DC/DC converter on the connecting wire and passes or interrupts a current flowing from the connecting point to the low-voltage DC/DC converter.

Abstract: In a vehicle power supply system, when a main power supply device is normal, a backup controller turns on a switch circuit and turns off a switch circuit to supply power from the main power supply device to a load unit LD1 and a load unit, and can travel a vehicle in a normal mode which is in a normal driving state. On the other hand, when the main power supply device is abnormal, the backup controller supplies power from the backup battery to the load unit and does not supply power from the backup battery to the load unit by turning on the switch circuit and turning off the switch circuit, and can travel the vehicle in the limit mode in which the functions are more limited than in the normal mode.

Abstract: In a vehicle power-supply system, a backup power-supply device includes a low-voltage DC/DC converter, a backup battery, and switching mechanisms. A bidirectional switch unit is provided between a high-voltage DC/DC converter and a connecting point on a connecting wire and passes or interrupts a current flowing between the high-voltage DC/DC converter and the connecting point. A bidirectional switch unit is provided between the connecting point and a connecting point on a connecting wire and passes or interrupts a current flowing between the connecting point and the connecting point. A unidirectional switch unit is provided between the connecting point and the low-voltage DC/DC converter on the connecting wire and passes or interrupts a current flowing from the connecting point to the low-voltage DC/DC converter.

Abstract: A vehicle power supply system includes a power supply path, and an ECU detaching a fault occurrence portion occurring in a part of the power supply path from the power supply path based on a set value lower than a lowest operation voltage of a load and a voltage related to the power supply path. The set value is set within a normal range of the voltage related to the power supply path. The power supply path includes a plurality of electrical connection units connected to the load and a plurality of connection wirings connecting each of the electrical connection units in a loop shape. In a case that a part of voltages related to each of the connection wirings is equal to or less than the set value, the control unit supplies power to the load via another part of the voltages related to each of the connection wirings.

Abstract: In a vehicle power supply system, when a main power supply device is normal, a backup controller turns on a switch circuit and turns off a switch circuit to supply power from the main power supply device to a load unit LD1 and a load unit, and can travel a vehicle in a normal mode which is in a normal driving state. On the other hand, when the main power supply device is abnormal, the backup controller supplies power from the backup battery to the load unit and does not supply power from the backup battery to the load unit by turning on the switch circuit and turning off the switch circuit, and can travel the vehicle in the limit mode in which the functions are more limited than in the normal mode.

Abstract: A vehicle power supply system includes a power supply path, and an ECU detaching a fault occurrence portion occurring in a part of the power supply path from the power supply path based on a set value lower than a lowest operation voltage of a load and a voltage related to the power supply path. The set value is set within a normal range of the voltage related to the power supply path. The power supply path includes a plurality of electrical connection units connected to the load and a plurality of connection wirings connecting each of the electrical connection units in a loop shape. In a case that a part of voltages related to each of the connection wirings is equal to or less than the set value, the control unit supplies power to the load via another part of the voltages related to each of the connection wirings.