Power supply backup device for use in portable electronic apparatus

U.S. Patent Number: 5347163

Abstract: The present invention provides a power supply backup device for a portable electronic apparatus having a main battery and an auxiliary battery for supplying power when a voltage of the main battery drops. The power supply backup device comprises a backup battery for supplying power at a time of an exchange of at least one of the main battery and the auxiliary battery, a mechanism for detecting a removal of the main battery and the auxiliary battery respectively from the apparatus, and a mechanism for switching over a circuit for connecting the backup battery with the apparatus so as to supply power from the backup battery when the detecting mechanism detects the removal of at least one of the main battery and the auxiliary battery.

Inventors: Yoshimura; Yutaka (Nara, JP)

Assignee: Sharp Kabushiki Kaisha (Osaka, JP)

Application Number: 07/827,948

Issued: 1994-09-13

Expired: 2006-09-13

Classes: 307/66 ; 307/150

Field of search: 307/64,66,150 365/228,229

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