Protection circuit for battery feed circuit

Details Protection circuit for battery feed circuit Protection circuit for battery feed circuit

H - Electricity

02

H

317/12.4

H02H 3/20 (2006.01) H02H 9/02 (2006.01) H04M 3/18 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1333189

A protection circuit for a battery feed circuit used in a switching system. The protection circuit is comprised of: a supervising circuit for detecting an abnormal current flowing through a battery feed resistor; and a voltage limiting circuit for clamping a voltage across the battery feed resistor when the abnormal current is detected. Further, a control circuit is employed for stopping an operational amplifier when the abnormal current is detected. The operational amplifier constitutes a conventional battery feed circuit and is connected, at the output thereof, with the base of a battery feed transistor connected between a subscriber's line and the battery feed resistor.

569417

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