Ringer power generator circuit for carrier subscriber station te

Details Ringer power generator circuit for carrier subscriber station te Ringer power generator circuit for carrier subscriber station te

1977-08-25

1979-05-01

Claffy, Kathleen H.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By dynamoelectric machine converter

179 17E, 363 19, H04J 100, H04M 126

Patent

active

041525469

ABSTRACT:
A ringer-power generator circuit is provided in which ring pulses cause positive and negative output voltages of a swinging choke regulator to be alternately connected to one of the tip and ring lines of a handset; and cause a control circuit to be alternately connected to and disconnected from a supply voltage. The control circuit has an RC timing circuit which delays initial turn on of the regulator to prevent bell tapping, and includes a transistor, diodes and timing circuit which control maximum output power and maximum output voltage of the regulator for causing the latter to essentially operate as a voltage limited high impedance source.

REFERENCES:
patent: 3302130 (1967-01-01), Minks
patent: 3510584 (1970-05-01), Krasin et al.
patent: 3886321 (1975-05-01), Krasin et al.
patent: 3904833 (1975-09-01), Beene et al.
patent: 3927266 (1975-12-01), Stewart et al.
"Transistor Manual", General Electric Co., Seventh Edition, 1969, p. 52.

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