External power supply control system for cellular phone

Details External power supply control system for cellular phone External power supply control system for cellular phone

2005-06-28

2005-06-28

Trost, William (Department: 1745)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S343500, C455S343200, C363S049000, C363S050000, C323S285000

Reexamination Certificate

active

06912411

ABSTRACT:
An external power source control system for a portable telephone includes: a regulator5connected at an input thereof to a battery power source1or an external power source2and outputting a power supply voltage; a one-shot pulse generating circuit6generating a one-shot pulse when the external power source2is connected to the portable telephone; a reset circuit7outputting a reset signal when the power supply voltage reaches a predetermined threshold level; and a controller maintaining an output of the power supply voltage from said regulator5, based on the one-shot pulse, and canceling the maintenance of the output of the power supply voltage from said regulator5, based on a predetermined instruction indicating that the power is not necessary.

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patent: 4-117140 (1992-04-01), None
patent: 09-130325 (1997-05-01), None
patent: 10-28069 (1998-01-01), None

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