Method and device for controlling the power source of a portable

Details Method and device for controlling the power source of a portable Method and device for controlling the power source of a portable

1997-12-05

2000-05-02

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455572, 455404, H04B 138, H04M 100, H04M 1100

Patent

active

060583207

ABSTRACT:
A portable radio telephone or transceiver in which power source control is effected to prevent cases in which the telephone cannot be used due to lack of battery charge, and is made up of: a voltage detector 1 that detects the voltage of a battery 2 and outputs battery voltage information 11; memory 5 that stores voltage 51, which is a voltage at which the remaining charge of a battery is nearly exhausted, and voltage 521 higher than voltage 51, to enable the battery to operate the radio transceiver for at least one calling operation; key input detector 4 that detects the key input and outputs key input information 41; processor 3 which compares voltage 52 with battery voltage information 11 and outputs switch control signal 31 which operates to disconnect the battery from the main circuit when voltage information 11 is less than voltage 52; and switch 8 that disconnects the battery from main circuit 7 in accordance with switch control signal 31.

REFERENCES:
patent: 4509201 (1985-04-01), Sekigawa et al.
patent: 5095308 (1992-03-01), Hewitt
patent: 5155428 (1992-10-01), Kang
patent: 5278995 (1994-01-01), Hwang
patent: 5438612 (1995-08-01), Norimatsu
patent: 5633862 (1997-05-01), Suzuki et al.
patent: 5640441 (1997-06-01), Serrano et al.
patent: 5907795 (1999-05-01), Hwang

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