PURPOSE: To save power consumption by supplying a charging current to a battery at the time of stopping a current value smaller than a charging current at the time of driving if a command of stopping a DC driver is instructed.
CONSTITUTION: When stopping a DC driver 20 is instructed, a switch 50 cuts off a battery 30 from the driver 20, and an instruction depended constant current unit 80 supplies a charging current to the battery 30 at the time of stopping. Here, the charging current at the time of stopping is set smaller than the value of a charging current at the time of driving. Thus, if the value of the charging current is small, a calorific value of an AC/DC converter 10 is small, and hence it is not necessary to supply power to a cooler 60 so as to cool it. In this manner, the power consumption of a battery backup DC supplying apparatus can be saved.
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