Telephone line power utility circuit

Details Telephone line power utility circuit Telephone line power utility circuit

1993-06-01

1995-10-24

Hofsass, Jeffery A.

Telephonic communications

Subscriber line or transmission line interface

For line length compensation

379394, 379404, 379398, 363 21, 323266, 323343, H04M 1900

Patent

active

054616719

ABSTRACT:
A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current resistance, the telephone line power utility circuit including a DC-DC converter connected with the line terminal device for supplying the direct-current power to the line terminal device, the DC-DC converter having an input direct-current resistance; and a central processing unit (CPU), connected with the DC-DC converter, for obtaining a maximum input direct-current resistance of the DC-DC converter to increase the efficiency of receiving power of the DC-DC converter by allowing the direct-current resistance of the line terminal device, viewed from the telephone line-side, to satisfy a predetermined standard, controlling the duty ratio of the primary side switching element, and/or switching the taps of the primary side winding of the transformer of the DC-DC converter, such that the direct-current power supplied through the telephone line can effectively be used as a power source for the line terminal device.

REFERENCES:
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patent: 4429186 (1984-01-01), Gortner
patent: 4431869 (1984-02-01), Sweet
patent: 4454466 (1984-06-01), Ritter
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patent: 4961220 (1990-10-01), Tentler et al.
patent: 5034871 (1991-07-01), Okamoto et al.
patent: 5144544 (1992-09-01), Jenneve et al.
patent: 5181240 (1993-01-01), Sakuragi et al.
patent: 5208432 (1993-05-01), Han
patent: 5289359 (1994-02-01), Ziermann

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