Telephone line sourced power supply

Details Telephone line sourced power supply Telephone line sourced power supply

1994-05-13

1996-09-03

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, 379 58, 379 93, H04M 1900

Patent

active

055531385

ABSTRACT:
In a telecommunication unit attached to a telephone line, power is provided by taking power from the telephone line when the unit is off-hook. When the unit remains on-hook, power is maintained to circuitry in the unit by a charge stored in a capacitor. When the capacitor's charge is reduced to a level no longer able to sustain operation of the unit, the unit is briefly taken off-hook, allowing the capacitor to recharge. Charge control of the capacitor is performed either by discrete circuitry or by a microcontroller, and further includes logic provisions preventing the unit from remaining off-hook for an unduly long period of time.

REFERENCES:
patent: 4803719 (1989-02-01), Ulrich
patent: 4961220 (1990-10-01), Tentler et al.
patent: 5014308 (1991-05-01), Fox
patent: 5160851 (1992-11-01), McAndrews
patent: 5220597 (1993-06-01), Horiuchi
patent: 5289359 (1994-02-01), Ziermann
patent: 5327493 (1994-07-01), Richmond et al.
Freer et al., "Local-Battery Charging over Subscribers' Lines", Jul. 1973, pp. 73-76, The Post Office Electrical Engineers' Journal, vol. 66, part 2.

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