초록 ▼

A backup power-supply device is provided. The backup power-supply device can supply a DC power to an electric appliance when an external power source electrically connected to the electric appliance is interrupted. The backup power-supply device can sustain supplying the DC power for at least three

A backup power-supply device is provided. The backup power-supply device can supply a DC power to an electric appliance when an external power source electrically connected to the electric appliance is interrupted. The backup power-supply device can sustain supplying the DC power for at least three to five minutes so that the operation of the electric appliance will not be interrupted during the power outage.

대표청구항 ▼

[What is claimed is:] [1.]an input terminal electrically connected to said external power source for receiving power from said external power source;an output terminal electrically connected to said second receptacle of said power supply;a power-accumulating unit for accumulating the backup power th

[What is claimed is:] [1.]an input terminal electrically connected to said external power source for receiving power from said external power source;an output terminal electrically connected to said second receptacle of said power supply;a power-accumulating unit for accumulating the backup power therein when said electric appliance is under said normal power-supply state and releasing said backup power when said external power source fails to supply power;a charger electrically connected between said input terminal and said power-accumulating unit for charging said power-accumulating unit when said electric appliance is under said normal power-supply state;a DC/DC converter electrically connected between said power-accumulating unit and said output terminal for converting a low-level direct current signal outputted from said power-accumulating unit into a high-level direct current signal provided for said electrical appliance through said output terminal and said second receptacle of said power supply; anda detecting circuit electrically connected to said input terminal, said charger, and said DC/DC converter and detecting the power-supply state from said external power source for turning on said DC/DC converter and having said DC/DC converter release said backup power to said electric appliance when said external power source fails to supply power.