Power supply assembly for portable phone

Details Power supply assembly for portable phone Power supply assembly for portable phone

1998-02-20

2000-12-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455572, H04B 138

Patent

active

061672890

ABSTRACT:
A portable phone has an internal battery and an external battery pack is releasably attachable to the phone. A control unit in the phone controls connection of the respective batteries to a phone power input, depending on the detection of the external battery voltage. Whenever an external battery is present with a voltage above a predetermined minimum value, the external battery will be connected to the phone power input to provide power to operate the phone, so that the internal battery lifetime is extended. When the external battery voltage falls below the minimum value, or the external battery is removed, the unit automatically switches to internal battery power, so that the external battery can be changed without interrupting power supply to the phone, if the phone is on or during a call.

REFERENCES:
patent: 5440221 (1995-08-01), Landau et al.
patent: 5613229 (1997-03-01), Baranowski et al.
patent: 5684384 (1997-11-01), Barkat et al.
patent: 5686808 (1997-11-01), Lutz
patent: 5701597 (1997-12-01), Nakanishi et al.
patent: 5768371 (1998-06-01), Snyder
patent: 5860015 (1999-01-01), Olson
patent: 5862493 (1999-01-01), Barkat et al.

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