Hazardous voltage protection circuit

Details Hazardous voltage protection circuit Hazardous voltage protection circuit

1979-12-31

1981-04-28

Brigance, Gerald L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

179184, 361 91, 361110, H04M 100

Patent

active

042647878

ABSTRACT:
A circuit for protecting telephone lines from AC hazardous voltages. The circuit includes an amplitude discriminator triggered at a predetermined voltage level connected to the telephone lines, and providing an output pulse for each zero voltage crossover of the hazardous voltage. A digital pulse counter counts a predetermined number of output pulses from the amplitude discriminator, which in turn operates a switch after the predetermined number of pulses are counted, opening the telephone lines between the central office and the telephone instrument until the hazardous voltage has been removed from the lines.

REFERENCES:
patent: 3558830 (1971-01-01), Bender
patent: 3836790 (1974-09-01), Becker
patent: 3925624 (1975-12-01), Earle et al.
patent: 3944889 (1976-03-01), Conway
patent: 4079211 (1978-03-01), Janssen
patent: 4145579 (1979-03-01), Angner et al.
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4194230 (1980-03-01), Danford

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