| 摘要 |
In an electric power source for supplying an electric power from a battery to an electric power line with boosting a voltage generated by the battery so that the electric power of boosted voltage is supplied to the electric power line, a main switch device prevents the electric power supply into the electric power line from the electric power source and the electric power supply from the electric power line into the electric power source in a case in which the boosted voltage to be supplied to the electric power line is less than a target voltage not less than a voltage of the electric power line, while allowing the electric power supply into the electric power line from the electric power source when the boosted voltage to be supplied to the electric power line is not less than the target voltage.
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