Remote feed circuit in communication systems

Details Remote feed circuit in communication systems Remote feed circuit in communication systems

1994-12-13

1996-08-06

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 38, 307139, 340664, 34082506, 361 72, 361119, H01H 8320

Patent

active

055436692

ABSTRACT:
In communication systems, a dc voltage source can be connected via a first and a second winding of an input transformer and a subscriber line to every communication terminal equipment device by using an electronic switch. In case of an overload, the turn-off duration, i.e. the time until the disconnect of the dc voltage source is influenced dependent on a load-generated loop current by using an integrating element and a comparator. As a result thereof, short turn-off durations and, consequently, significantly reduced thermal loads on the electronic switch occur given substantial overloads. The present invention allows the use of electronic switches having a lower maximum load.

REFERENCES:
patent: 4206443 (1980-06-01), Britton
patent: 4264787 (1981-04-01), Yachabach et al.
patent: 4983955 (1991-01-01), Ham Jr. et al.
patent: 5392349 (1995-02-01), Elder
Natzadapter Elector, Oct., 1983, pp. 10-27 to 10-29.
Electronik 15/25.7 pp. 99-102 Integreirte Strommessung und Uberlastxchutz.

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