H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/63
H04M 19/00 (2006.01) H04M 19/06 (2006.01)
Patent
CA 1179079
ABSTRACT OF THE DISCLOSURE A control circuit that is responsive to voltage con- ditions 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 con- nected in series across the line; a timing capacitor C1 connected between the cathode of a PUT (programmable unijunc- tion transistor) and one wire of the line; and a zener diode between the PUT anode and one wire for establishing a con- duction threshold for the PUT. The resistor and primary conduction path of a first bipolar transistor, having 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 current for the latter may be used for charging C2 when the charging circuit is disabled. A device is also included for driving the PUT gate voltage low and turning on the PUT in response to both high and low voltage conditions on the line. This dumps the C2 charge into C1, which discharges slowly for holding the charging circuit disabled. A second bipolar transistor senses the charge voltage on C1 for decreasing the PUT gate voltage 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.
398566
Gte Automatic Electric Incorporated
R. William Wray & Associates
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