Circuit arrangement for providing power for an IC chip in a tele

Details Circuit arrangement for providing power for an IC chip in a tele Circuit arrangement for providing power for an IC chip in a tele

1990-02-05

1991-05-07

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, H04M 1900, H04M 1908

Patent

active

050143085

ABSTRACT:
A battery-less telephone subset retains data in its processor memory with a storage capacitor which is kept charged by three controlled charge circuits which deliver power from the line to the capacitor under various line conditions and phone states. The first charge circuit charges the circuit initially, the second charge circuit then charges the capacitor (6.8 v) while all subsets remain on-hook (line voltage 50 v). When a second subset goes off-hook and the line voltage drops (to about 10 v), the capacitor is charged by the third charge circuit at a lower voltage (3.5 v) that is nevertheless sufficiently high to maintain the first subset's on-hook functions. Preferably, the third circuit is controlled by the subset's line switch control circuit, thereby minimizing the number of required components.

REFERENCES:
patent: 4532382 (1985-07-01), Pommer, II
patent: 4547629 (1985-10-01), Corless
patent: 4591666 (1986-05-01), Boeckmann
patent: 4636588 (1987-01-01), Nakayama et al.
patent: 4647787 (1987-03-01), Pommer, II

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