Circuit arrangement for protecting electronic interface circuit

Details Circuit arrangement for protecting electronic interface circuit Circuit arrangement for protecting electronic interface circuit

1989-05-04

1991-03-26

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379331, 361119, H04M 70

Patent

active

050035886

ABSTRACT:
Thyristors utilized as protective elements receive trigger current by way of a respective semiconductor switch having a control electrode thereof coupled to a supply battery. The supply battery thus need only supply the sum of control currents for respective semiconductor switches whereas the current required by the protective thyristors is provided by the interfering source, for example, by a stroke of lightning.

REFERENCES:
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patent: 3590346 (1971-06-01), Bilo
patent: 3614474 (1971-10-01), Hahn
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patent: 4213066 (1980-07-01), Rogers
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patent: 4377832 (1983-03-01), Toney et al.
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patent: 4661979 (1987-04-01), Jakab
patent: 4695916 (1987-09-01), Satoh
Modern Electronic Devices: Circuit Design and Application, M. Rosenstein et al., Reston Publishing Comp. Inc., Reston, Va., 1985, pp. 99, 100, 306, 307.
"Low-Level Over-Voltage Protect Circuit", A. N. Luce et al., IBM Tech. Disclosure Bulletin, vol. 13, No. 2, Jul. 1970, p. 509.

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