Voltage regulator control circuit for a subscriber line interfac

Details Voltage regulator control circuit for a subscriber line interfac Voltage regulator control circuit for a subscriber line interfac

1987-10-16

1989-01-24

LaRoche, Eugene R.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379387, H04M 1900

Patent

active

048005894

ABSTRACT:
A Subscriber Line Interface Circuit (SLIC) having a voltage regulator for application thereto of a DC supply voltage V.sub.B and connected at the output terminals to an audio transmission line to provide a line current I.sub.L and voltage V.sub.L for a given resistance load R.sub.L on the line, is provided with a control circuit which, by picking up appropriate current and voltage values from the interface circuit, outputs a voltage value which is the equal of the difference between an optimum supply voltage V.sub.BF and the supply voltage V.sub.B. The control circuit output is connected to the voltage regulator to minimize the voltage V.sub.BFK applied to the interface circuit as the transmission line resistance load R.sub.L varies, thus minimizing the power dissipated through the interface circuit.

REFERENCES:
patent: 4476350 (1984-10-01), Aull et al.

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