Battery charging circuit

Details Battery charging circuit Battery charging circuit

1975-12-05

1977-09-13

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

179 25R, 320 23, 363 16, G05F 156, H02J 706

Patent

active

040485510

ABSTRACT:
A single channel carrier system for telephone service is disclosed including at the remote terminal a battery charger for charging a battery which powers the carrier electronics at the remote terminal. A ringing generator and supervisory circuits are disclosed to provide normal telephone supervison on the carrier-derived channel.
The battery charger includes a dc-to-dc converter to increase the rate of battery charging and an interface unit to minimize the effect on the telephone line by the charger. In one embodiment, the interface unit disconnects the charger to permit leakage testing of the line.

REFERENCES:
patent: 3510584 (1970-05-01), Krasin et al.
patent: 3701937 (1972-10-01), Combs
patent: 3771039 (1973-11-01), Stewart
patent: 3899754 (1975-08-01), Brolin

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