Vehicle power supply device

A vehicle power supply device comprising:

• a battery that supplies direct-current power to a high-voltage load unit and a low-voltage load unit having a lower voltage than a voltage of the high-voltage load unit;
• an alternating-current power supply connector that is connected to an alternating-current power supply unit supplying alternating-current power to the battery;
• an AC/DC converter that converts, into direct-current power, the alternating-current power being supplied to the battery from the alternating-current power supply unit;
• a bidirectional DC/DC converter that boosts a voltage of the direct-current power converted by the AC/DC converter to output the direct-current power to the battery and steps down a voltage of the direct-current power being supplied to the low-voltage load unit from the battery;
• a first direct-current power supply connector that is connected to a first direct-current power supply unit supplying direct-current power;
• a second direct-current power supply connector that is connected to a second direct-current power supply unit supplying direct-current power having a higher voltage than a voltage of the first direct-current power supply unit;
• and
• a controller that controls the AC/DC converter and the bidirectional DC/DC converter, wherein
• when the alternating-current power is supplied from the alternating-current power supply unit, the controller charges the battery with direct-current power converted by the AC/DC converter and boosted by the bidirectional DC/DC converter and supplies, to the low-voltage load unit, the direct-current power converted by the AC/DC converter,
• when the direct-current power is supplied from the first direct-current power supply unit, the controller charges the battery with direct-current power boosted by the bidirectional DC/DC converter and supplies, to the low-voltage load unit, the direct-current power from the first direct-current power supply unit without passing through the bidirectional DC/DC converter,
• when the direct-current power is supplied from the second direct-current power supply unit, the controller charges the battery with the direct-current power from the second direct-current power supply unit without passing through the bidirectional DC/DC converter and supplies, to the low-voltage load unit, direct-current power of the battery that has been stepped down by the bidirectional DC/DC converter, and
• when no electric power is supplied from the alternating-current power supply unit, the first direct-current power supply unit, and the second direct-current power supply unit, the controller is capable of supplying the direct-current power to the high-voltage load unit from the battery without passing through the bidirectional DC/DC converter and supplies, to the low-voltage load unit, the direct-current power of the battery that has been stepped down by the bidirectional DC/DC converter.