Electric source circuit for telephone sets

Details Electric source circuit for telephone sets Electric source circuit for telephone sets

1985-02-27

1987-01-13

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379387, 379413, H04M 1900

Patent

active

046365885

ABSTRACT:
An output voltage of a first diode deriving out an office line voltage, and an output voltage of a second diode deriving out the voltage of a back-up battery are combined and then smoothed by a smoothing capacitor. The smoothed voltage is supplied to a control circuit. A voltage limiting circuit is connected to the input side of the first limiter for limiting the upper limit of the smoothed voltage. A switch circuit is provided which is rendered conductive at the time of talking and the at the time of sending out a dial pulse for combining the office line voltage with the combined voltage. A voltage limiting circuit is also provided which is enabled only at the time of talking and at the time of sending out a dial pulse for limiting the upper limit of the combined voltage.

REFERENCES:
patent: 4360710 (1982-11-01), Chaput et al.
patent: 4532382 (1985-07-01), Pommer II
patent: 4560841 (1985-12-01), Pierrel

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