Transformerless digital-line battery feed circuit

Details Transformerless digital-line battery feed circuit Transformerless digital-line battery feed circuit

1997-11-06

1998-12-29

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

320162, 320163, 320165, 379413, 379402, 379403, 379377, 379399, H04B 336

Patent

active

058545506

ABSTRACT:
A transformerless battery feed circuit for a digital telecommunications line (100) presents a high impedance to digital signals and a low impedance to direct current, and provides a constant-voltage feed with current limiting. The battery feed circuit comprises a pair of transformerless controlled current sources, one for each lead (T,R) of the line, each taking the form of a high-gain transistor (Q1, Q2) having a collector coupled to a source of power (e.g., a battery V1), a base resistively coupled to the power source and capacitively coupled to its corresponding lead, and an emitter coupled to its corresponding lead. The battery feed circuit further comprises a pair of control circuits, one for each current source, each taking the form of a transistor (Q3, Q4) having a collector coupled to the base of the corresponding high-gain transistor, a base resistively coupled to the emitter of the corresponding high-gain transistor and to the power source, and an emitter coupled to the corresponding lead.

REFERENCES:
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4419542 (1983-12-01), Embree et al.
patent: 4612417 (1986-09-01), Toumani
patent: 4656661 (1987-04-01), Carbrey
patent: 4736415 (1988-04-01), McNeill et al.
patent: 4803721 (1989-02-01), Schingh
patent: 5444777 (1995-08-01), Condon et al.
patent: 5528688 (1996-06-01), Schorr

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