Title: Battery charging circuit

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.

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Other info:

Inventors: Bosik, Barry Sheldon (Parsippany, NJ, US)

Application Number: 638164
Filing Date: 1975-12-05
Publication_date: 1977-09-13
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 320/140 320/DIG24, 363/16, 370/485
Other Classes:
US Patent Ref:

3510584	May, 1970	Krasin et al.	179/2.
3701937	Oct, 1972	Combs	321/2.
3771039	Nov, 1973	Stewart	320/2.
3899754	Aug, 1975	Brolin	332/11.

Other Refs:
Primary Examiner: Hickey, Robert J.
Assistant Examiner:
Attorney: Nimtz; Robert O.