Power supply interface

Details Power supply interface Power supply interface

1993-11-30

1994-09-27

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Miscellaneous systems

Power packs

307149, H02J 700

Patent

active

053509498

ABSTRACT:
The present invention relates to a power supply interface for a mobile telephone powered from a battery whose terminal voltage is greater than the maximum supply voltage of the mobile telephone. The invention is characterized by a resistive cable (4) which is wound helically and which is connected between an electrical contact (5) on a voltage supply source and an electronic unit mounted in a housing (6). The electronic unit includes a voltage regulator which delivers a controlled output voltage. The resistance of the cable shall exhibit certain conditions and shall have a length which is adapted to the resistance such that when at maximum load the mobile telephone will only be heated to a moderate extent; a maximum temperature of about 50.degree. C., preferably 35.degree. C., is intended.

REFERENCES:
patent: 3896364 (1975-07-01), Reister
patent: 4654882 (1987-03-01), Ikeda
patent: 4829224 (1989-05-01), Gandelman et al.
patent: 4831321 (1989-05-01), Cooper
patent: 4870698 (1989-09-01), Katsuyama et al.
patent: 4916729 (1990-04-01), Usui
patent: 5019767 (1991-05-01), Shirai et al.
patent: 5036532 (1991-06-01), Metroka et al.
patent: 5121504 (1992-06-01), Toka

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