Charger for portable terminal equipment having on-hook/off-hook

Details Charger for portable terminal equipment having on-hook/off-hook Charger for portable terminal equipment having on-hook/off-hook

1993-08-03

1999-01-19

Ramirez, Nestor

Electricity: battery or capacitor charging or discharging

Means to identify cell or battery type

320110, H01M 1046

Patent

active

058617299

ABSTRACT:
A charger for portable terminal equipment, capable of distinguishing a nickel-hydride battery pack and a nickel-cadmium battery pack and of detecting an on-hook/off-hook condition even when the nickel-hydride battery pack is used. The charger includes a charging circuit, a pair of third charging terminals connected to the charging circuit and adapted to be selectively connected to either a pair of first charging terminals of the nickel-hydride battery pack or a pair of second charging terminals of the nickel-cadmium battery pack, and a third auxiliary terminal adapted to be selectively connected to either a first auxiliary terminal of the nickel-hydride battery pack or a second auxiliary terminal of the nickel-cadmium battery pack. The charger further includes a device for comparing a voltage at the third auxiliary terminal with a first reference voltage and detecting the on-hook condition or the off-hook condition of the portable terminal equipment, and a device for comparing the voltage at the third auxiliary terminal with a second reference voltage lower than the first reference voltage and distinguishing the nickel-hydride battery pack and the nickel-cadmium battery pack.

REFERENCES:
patent: 4006396 (1977-02-01), Bogut
patent: 4792743 (1988-12-01), Tsujino et al.
patent: 4849682 (1989-07-01), Bauer et al.
patent: 5200686 (1993-04-01), Lee
patent: 5237257 (1993-08-01), Johnson et al.
patent: 5332957 (1994-07-01), Lee
patent: 5506490 (1996-04-01), DeMuro
patent: 5576610 (1996-11-01), Patino et al.
patent: 5646501 (1997-07-01), Fishman et al.
patent: 5656917 (1997-08-01), Theobald

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