Ringing signal generation circuit with protection against overvo

Details Ringing signal generation circuit with protection against overvo Ringing signal generation circuit with protection against overvo

1990-06-06

1994-03-15

Dwyer, James L.

Telephonic communications

Centralized switching system

Having protective circuit

379252, 379253, 379418, 379412, H04M 304

Patent

active

052951855

ABSTRACT:
A ringing signal generation circuit contains a direct current power source, a transformer, a control transistor, a rectifying and smoothing circuit, an invertor circuit, and an invertor controlling circuit. The direct current power source generates a direct current voltage. The transformer contains a primary winding and a base-driving winding in a primary side, and a secondary winding in a secondary side. The control transistor is connected in series to the primary winding and the direct current power source, and controls a current flowing in the primary winding. The rectifying and smoothing circuit rectifies and smooths a current generated in the secondary winding. The invertor circuit for converting a direct current output of the rectifying and smoothing circuit into an alternating current. The invertor controlling circuit controls the invertor circuit. Further, an overvoltage detecting circuit is provided for detecting an overvoltage in the secondary winding; and a current supply stopping circuit is provided for stopping a supply of the current to the primary winding.

REFERENCES:
patent: 3155777 (1964-11-01), Owen
patent: 3229040 (1966-01-01), Drake et al.
patent: 3665109 (1972-05-01), Shaffer
patent: 3723662 (1973-03-01), Macrander
patent: 4309736 (1982-01-01), Lissillous
patent: 4914560 (1990-04-01), Oh et al.
patent: 5003588 (1991-03-01), Wingerath

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