Optically isolated line voltage sensing circuit

Details Optically isolated line voltage sensing circuit Optically isolated line voltage sensing circuit

1996-09-06

1999-09-28

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324119, 324133, G01R 1900, G01R 1914, G01R 1922

Patent

active

059594489

ABSTRACT:
A linear optocoupler is employed to provide a signal which is a galvanically isolated reproduction of the magnitude of an A.C. line voltage and another galvanically isolated signal indicative of a change in the polarity of the line voltage for enabling safe monitoring of a change the A.C. voltage. Actuation of an automatic transfer switch to substitute an emergency source of power for a normal source that has failed may be achieved with the emergency power waveform used to replicate the normal power waveform.

REFERENCES:
patent: 2038277 (1936-04-01), Gent
patent: 2081839 (1937-05-01), Rankin
patent: 3312895 (1967-04-01), Garbuny
patent: 3829774 (1974-08-01), Cerveny
patent: 4527118 (1985-07-01), Koslar
patent: 4788493 (1988-11-01), Liptak

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