Feeding bridge with d.c.-compensation for both directions of the

Details Feeding bridge with d.c.-compensation for both directions of the Feeding bridge with d.c.-compensation for both directions of the

1979-07-09

1980-11-18

Brigance, Gerald L.

179 70, 179 18FA, H04M 1908

Patent

active

042347637

ABSTRACT:
A bridge circuit comprising an isolation transformer having six primary windings which are connected so that the voice currents do and the supply currents do not generate, for either direction of current flow, a resulting flux in the core of the transformer. The bridge comprises two transistor circuits which prevent the voice currents from flowing through a supply source connected to the bridge and also balance the bridge circuit so that the influence of longitudinal noise signals which are produced in a transmission line connected to the bridge circuit are suppressed. The direction of the feed current in the transmission line can be reversed by means of the transistor circuits.

REFERENCES:
patent: 3300588 (1967-01-01), Flowers
patent: 3959718 (1976-05-01), Hasegawa
patent: 4027235 (1977-05-01), Macrander et al.
patent: 4056691 (1977-11-01), Freimanis et al.
patent: 4087647 (1978-05-01), Embree et al.
patent: 4088843 (1978-05-01), Rogers et al.
patent: 4103112 (1978-07-01), Korsky
patent: 4110636 (1978-08-01), Diskmans
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4178485 (1979-12-01), Cowpland et al.

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