Automatically resetting protection arrangement for a telephone s

Details Automatically resetting protection arrangement for a telephone s Automatically resetting protection arrangement for a telephone s

1989-04-28

1992-09-08

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 56, 361 91, 361119, 379412, H02H 904, H02H 320

Patent

active

051463849

ABSTRACT:
A protection arrangement for coupling a two-wire line to a SLIC includes surge protecting triacs between each wire and ground, and normally closed contacts coupling the wires to the SLIC. The triacs are triggered via varistors coupled to the wires on the SLIC side of the contacts, which are opened in response to over-voltages on the line, as detected via a diode bridge and threshold circuit. The triacs are thereby not triggered during over-voltage conditions so that their power dissipation is reduced during such faults, whereas they respond rapidly to surge conditions which accordingly need not be handled by the contacts.

REFERENCES:
patent: 4106070 (1978-08-01), Gordon et al.
patent: 4408248 (1983-10-01), Bulley et al.
patent: 4467310 (1984-08-01), Jakab
patent: 4695916 (1987-09-01), Satoh et al.
patent: 4709296 (1987-11-01), Hung et al.
patent: 4849846 (1989-07-01), Hung et al.
Review of the Electrical Communication Laboratories, vol. 33, No. 2, 1985, Circuit Design of Surge Protector for 200 kb/s Ping-Pong Transmission Equipment, Kajiwara et al., p. 367 and p. 368.

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