Apparatus for monitoring an AC variable

Details Apparatus for monitoring an AC variable Apparatus for monitoring an AC variable

1977-06-21

1979-05-01

Heyman, John S.

Oscillators

Relaxation oscillators

328141, 331 1A, 331 25, 340661, 328148, H03K 518, H03K 520, H03B 304

Patent

active

041526562

ABSTRACT:
Apparatus for the rapid monitoring of an alternating (a-c) variable with respect to amplitude, frequency and phase which includes a generator circuit for forming, from an actual a-c voltage imaging the monitored a-c variable, a reference a-c voltage of predetermined amplitude and frequency which is linked to the former in rigid phase relationship, and comparators for comparing individual signals of the generator circuit with the instantaneous values of the actual value a-c voltage, permitting recognition of disturbances in a time which is substantially shorter than one period of the a-c variable monitored.

REFERENCES:
patent: 3796962 (1974-03-01), Hekimian
patent: 3893042 (1975-07-01), Whitman et al.
patent: 3956710 (1976-05-01), Seitz et al.
patent: 4007429 (1977-02-01), Cadalura et al.

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