Ring trip circuit having a simple trip detecting circuit of a hi

Details Ring trip circuit having a simple trip detecting circuit of a hi Ring trip circuit having a simple trip detecting circuit of a hi

1996-07-26

1998-01-27

Zele, Krista M.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379350, 379377, 379382, H04M 100

Patent

active

057129100

ABSTRACT:
In a ring trip circuit, a trip detecting circuit includes a low pass filter connected to opposite ends of a first resistor detecting an AC ringing signal, a diode bridge connected to an output of the low pass filter, a first series circuit connected to an output of the diode bridge and composed of a Zener diode and a light emitting diode of a first photocoupler, so that a phototransistor of the first photocoupler outputs a trip detection signal to a circuit which can be driven with a different power supply. A zero-crossing point detecting circuit has a second series circuit connected to the opposite ends of the first resistor and composed of a second resistor, a second Zener diode and a light emitting diode of a second photocoupler, so that a phototransistor of the second photocoupler outputs a zero-crossing point detection signal to a circuit which can be driven with a different power supply. A ringing signal supplying relay control circuit receives the trip detection signal and the zero-crossing point detection signal, for generating a switching signal at a zero-crossing point of the AC ringing signal.

REFERENCES:
patent: 3829619 (1974-08-01), Close et al.
patent: 4524245 (1985-06-01), Littlefield
patent: 5140631 (1992-08-01), Stahl

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