Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1978-01-10
1979-06-12
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 56, H02H 320
Patent
active
041582144
ABSTRACT:
A circuit for protecting a telephone junctor from excessive alternating or direct current voltage includes a diode bridge connected to the junctor. A first threshold detector connected to the diode bridge detects excessive positive voltages and a second threshold detector connected to the diode bridge detects excessive negative voltages. The output of the two threshold detectors are applied to a temporization circuit which inhibits an over-voltage indication signal from being generated by transient over-voltages. The temporization circuit also sustains an over-voltage indication signal when the signal waveform of an alternating-current over-voltage passes through zero. A circuit responsive to an over-voltage indication signal inhibits application of power to the junctor circuit.
REFERENCES:
patent: 3243658 (1966-03-01), Blackburn
patent: 3311907 (1967-03-01), Teal
patent: 3537757 (1970-11-01), Griffin
Bolus Daniel M. A. F.
Chevillon Jean-Pierre
Comte Jean-Charles
Philippe Pierre D. P.
International Standard Electric Corporation
Lenkszus Donald J.
Moose Jr. Harry E.
Raden James B.
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