Telephone subscriber loop overvoltage protection integrated circ

Details Telephone subscriber loop overvoltage protection integrated circ Telephone subscriber loop overvoltage protection integrated circ

1985-11-01

1987-02-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 60, 361 91, 361119, H02H 904

Patent

active

046444378

ABSTRACT:
An overvoltage protection circuit for communications systems for protecting equipment from power crosses on electric utility lines. A timed latch circuit is used to activate a plurality of steering SCR's which crowbar the overvoltage. The utilization of a latch circuit to activate the steering arrangement, instead of the conventional technique of using actual overvoltage line current, allows smaller devices to be used, thus reducing both circuit size and circuit power dissipation.

REFERENCES:
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patent: 4106070 (1978-08-01), Gordon et al.
patent: 4156263 (1979-05-01), Comerford et al.
patent: 4254442 (1981-03-01), Dijkmans et al.
patent: 4282555 (1981-08-01), Suedberg
patent: 4377832 (1983-03-01), Toney et al.
patent: 4408248 (1983-10-01), Bulley et al.
patent: 4456940 (1984-06-01), Hammerberg et al.
patent: 4475012 (1984-10-01), Coulmance
patent: 4589047 (1986-05-01), Gaus et al.

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