Line interruption circuit for use in a telephone set

Details Line interruption circuit for use in a telephone set Line interruption circuit for use in a telephone set

1981-02-13

1983-06-14

Rubinson, G. Z.

179 90K, H04M 144

Patent

active

043884997

ABSTRACT:
A circuit comprising a line interruption arrangement for producing dial pulses, comprising a series arrangement of a semiconductor switching element and a control device connected between a first and a second line terminal, the first and second terminals being provided to enable connection to a subscriber's line. To limit the current in the subscriber's line while using a minimum of components, the control circuit comprises a current detection device which is connected to the control electrode of the semiconductor switching element to drive the semiconductor switching element into saturation when the line current is below a predetermined value and to drive the semiconductor switching element out of saturation when the line current is above the said predetermined value.

REFERENCES:
patent: 4079211 (1978-03-01), Janssen
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4329546 (1982-05-01), Montessi et al.

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