H - Electricity – 04 – M
Patent
H - Electricity
04
M
325/30, 379/63
H04M 19/00 (2006.01) H04M 19/08 (2006.01)
Patent
CA 1175488
D-23,772 POWER SUPPLY CONTROL CIRCUIT FOR SUBSCRIBER CARRIER TELEPHONE SYSTEM by James A. Stewart Abstract of Disclosure A control circuit that is responsive to voltage conditions on a cable pair transmission line for selectively disabling a battery charging circuit operating off of line current comprises a resistor and storage capacitor C2 connected in series across the line; a timing capacitor C1 connected between the cathode of a PUT (programmable unijunction transis- tor) and one wire of the line; and a zener diode between the PUT anode and one wire for establishing a conduction threshold for the PUT. The resistor and primary conduction path of a first bipolar transistor, hav- ing its base connected to the PUT anode, are connected in series between the other wire of the line and the charging circuit so that startup our- rent for the latter may be used for charging C2 when the charging circuit is disabled. Means is also included for driving the PUT gate voltage low and turning on the PUT in response to both high and low voltage condi- tions on the line. This dumps the C2 charge into C1, which discharges slowly for holding the charging circuit disabled. A second bipolar tran- sistor senses the charge voltage on C1 for decreasing the PUT gate vol- tage when the PUT conducts and for increasing it immediately prior to enabling the charging circuit to draw line current in order to prevent on-off cycling of the latter on a long cable pair.
398090
Gte Automatic Electric Incorporated
R. William Wray & Associates
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