Constant current circuits

Details Constant current circuits Constant current circuits

1986-11-12

1987-12-29

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323349, 379413, G05F 328

Patent

active

047163585

ABSTRACT:
A constant current circuit includes a first constant current source including a transistor and a resistor, and a second source also including a resistor and a transistor which is controlled via a differential amplifier to produce a second constant current equal to the first. The differential amplifier has inputs connected to tapping points of similar potential dividers coupled between the current sources. The circuit is particularly applicable for supply d.c. sealing current via center-tapped transformer windings to the two balanced wire pairs of a four-wire transmission line.

REFERENCES:
patent: 3370222 (1968-02-01), Haagen-Smit et al.
patent: 3934099 (1976-01-01), Elder, Jr.

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