Patent ID: 7026726

Claim:
An uninterruptible power supply device comprising: a power supply circuit for supplying electric power from an external power source to electronic equipment; a rechargeable battery for storing the power from the power source, said rechargeable battery supplying the power stored therein to the electronic equipment, in place of said power supply circuit, when supply of the power from the power source is interrupted and also the electronic equipment is on; control means operating on the power supplied from the power source or said rechargeable battery, said control means controlling charging of said rechargeable battery in accordance with a charge state of said rechargeable battery and also controlling the power supply from said rechargeable battery to the electronic equipment; a power interruption detection section for outputting a power interruption signal to the electronic equipment and/or said control means when the power supply from the power source is interrupted; and timer means for stopping supply of the power to said control means after a lapse of a fixed time period from generation timing of the power interruption signal or from reception of a shut-down signal from the electronic equipment, wherein said control means updates and stores status of said rechargeable battery if the fixed time period is not yet elapsed, and does not newly store the status of said rechargeable battery if the fixed time period has elapsed.