Control point circuit

Details Control point circuit Control point circuit

H - Electricity

04

M

379/34

H04M 3/00 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 1072696

CONTROL POINT CIRCUIT ABSTRACT OF THE DISCLOSURE The disclosure relates to a control point circuit for use in a telephone exchange for energizing and de- energizing a control element such as a control relay in response to set and reset input pulses. The control point circuit comprises a transformer having a centertapped primary forming set, reset, and common inputs for receiving the set and reset input pulses and a secondary coupled to a constant control voltage. The control point circuit also includes a comparator having a first input coupled to the transformer secondary, an output coupled to the control relay to be energized and de-energized and a second input coupled to the comparator output for receiving first and second reference voltages which are related in magnitude to the constant control voltage to maintain the comparator in the set state or reset state indefinitely until a reset or set input pulse is received. A received input pulse causes an induced voltage within the transformer secondary which augments the control voltage to change the relation in magnitude between the reference voltages and the control voltage to cause the comparator to change states in response to the received set and reset input pulses. When the com- parator is in the set state, the control relay is energized and when the comparator is in the reset state, the control relay is de-energized.

277941

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