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    • 3. 发明专利
    • Power control unit and power supply control method
    • JP4984320B2
    • 2012-07-25
    • JP2007004831
    • 2007-01-12
    • トヨタ自動車株式会社
    • 克実 土田
    • H02M3/155B60R16/033B62D5/04H02M3/28
    • PROBLEM TO BE SOLVED: To provide a device and a method for power supply control wherein in a system for supplying power from multiple batteries to an electrical load, a backup power supply function is realized by a low-voltage system battery and regenerative power from the electrical load is appropriately treated. SOLUTION: The power supply control device includes a voltage step-up circuit, a voltage step-down circuit, and a control unit. The voltage step-down circuit steps down power supplied from a high-voltage system battery to a predetermined voltage and supplies it to an electrical load. The voltage step-up circuit steps up power supplied from a low-voltage system battery to a predetermined voltage and supplies it to the electrical load. The control unit controls the operation of the step-down circuit and the step-up circuit. The step-up circuit has a switching element. The switching element is provided on the power supply line connecting the low-voltage system battery and the electrical load. When a predetermined condition is met, the control unit controls and brings the switching element into conduction and thereby causes power on the electrical load side to flow back to the low-voltage system battery through the step-up circuit. COPYRIGHT: (C)2008,JPO&INPIT