Active impedance line feed circuit with improved ground fault pr

Details Active impedance line feed circuit with improved ground fault pr Active impedance line feed circuit with improved ground fault pr

1984-03-12

1986-02-18

George, Keith E.

179 16F, 179 77, 179170NC, H04M 174, H04M 176, H04M 1900

Patent

active

045714606

ABSTRACT:
A typical active impedance line feed circuit includes tip and ring amplifiers being controlled to exhibit a.c. impedance and d.c. resistance characteristics for the purpose of supplying energizing current for tip and ring leads of a two wire communication line. Protection from excessive heat generation in an instant of a ground fault on the communication line is provided by a d.c. amplifier having an input resistively connected to the tip and ring leads and an output connected via a resistive unidirectional current path to an input of the ring amplifier. A ground fault occurrence causes the resistive unidirectional current path to become conductive and reduces the current flow in the ring lead by causing the output voltage of the ring amplifier to vary in the direction of ground potential. The output of the d.c. amplifier is also useful for improving circuit tolerance of longitudinal interference.

REFERENCES:
patent: 4281219 (1981-07-01), Cowpland et al.
patent: 4322586 (1982-03-01), Mein et al.
patent: 4323734 (1982-04-01), Kimzey
patent: 4375015 (1983-02-01), Chambers, Jr.
patent: 4385336 (1983-05-01), Takeshita et al.
patent: 4388500 (1983-06-01), Regan
patent: 4472608 (1984-09-01), Beirne
patent: 4473719 (1984-09-01), Embree et al.
patent: 4476350 (1984-10-01), Aull et al.
"A High Voltage IC for a Transformerless Trunk and Subscriber Line Interface", Aull et al., IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 281-286.

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