Power supply backup device for use in portable electronic appara

Details Power supply backup device for use in portable electronic appara Power supply backup device for use in portable electronic appara

1992-01-31

1994-09-13

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307150, H02J 700

Patent

active

053471636

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.

REFERENCES:
patent: 4451742 (1984-05-01), Aswell
patent: 4694237 (1987-09-01), Hanson
patent: 4956462 (1990-10-01), Crawford
patent: 5079741 (1992-01-01), Kimura
patent: 5148042 (1992-09-01), Nakazoe
patent: 5177371 (1993-01-01), Faulk

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