| 摘要 |
PROBLEM TO BE SOLVED: To maintain reliability and a relatively inexpensive configuration regarding a backup power-supply device capable of supplying a DC voltage to a load even when an AC power supply fails. SOLUTION: The backup power-supply device includes a main power-supply part 1, charging part 2, and battery 3 so as to be used as a substitute for the AC power supply 10 while generating an AC voltage by starting an engine when the AC power supply 10 fails. The backup power-supply device includes a current detection part 4 for detecting a current when supplying a DC current from the battery 3 to the load 7, a charging stop means, which holds a detection signal generated by the current detection part 4 in a holding part 12 while inputting it to the charging part 2 so as to stop a charging action of the charging part 2 on the battery 3 until the held state is released, and a power-failure detection part 8 that resets the holding part 12 along with stopping the engine by detecting power-restoration of the AC power supply 10 after starting the engine for driving an AC generator 20 by detecting a power failure of the AC power supply 10. COPYRIGHT: (C)2008,JPO&INPIT
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