| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular power supply device and power supply control method, capable of preventing generation of insufficient charging of a low-voltage battery connected to a subsequent stage of a DC-DC converter.SOLUTION: The vehicular power supply device includes: a first battery 1 that supplies a high voltage to a high-voltage system through switches RL1 to RL3 for power feeding; a DC-DC converter 2 that is directly connected to the first battery 1 and supplied with electric power from the first battery 1; a second battery 3 that is supplied with electric power from the DC-DC converter 2 and supplies a low voltage to a low-voltage system through an ignition switch IG-SW; and a controller 4 that is directly connected to the second battery 3 and controls start and stop of the DC-DC converter 2 when it is detected that the ignition switch IG-SW is in such a state as to be not powered to a low-voltage system and charges the second battery 3 in such a state as to switch the switches RL1 to RL3 for power feeding. |
