| 摘要 |
A power-supply unit includes a plurality of cells for supplying power to a load, a capacitor connected in parallel to the plurality of cells, at least one voltage detector which detects a terminal voltage across each of the plurality of cells, a selecting device for selecting a first combination from predetermined combinations of at least one of the plurality of cells in accordance with the terminal voltage, wherein the selected first combination of cells can supply a maximum voltage for charging the capacitor without exceeding a withstand voltage of the capacitor, and a controller for charging the electric double layer capacitor with the selected first combination of cells. A method of charging an electric double layer capacitor provided in the power-supply unit is also disclosed.
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