Frequency abnormality detecting circuit

Details Frequency abnormality detecting circuit Frequency abnormality detecting circuit

1987-04-24

1988-11-08

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78Z, G01R 3320

Patent

active

047836229

ABSTRACT:
A frequency abnormality detecting circuit for detecting the frequency abnormality of an AC power source, comprises a waveform shaping circuit for shaping an output waveform (detection waveform) of the AC power source, which is an object to be detected; a frequency demultiplier for demultiplying an output of the waveform shaping circuit at least by one period of the dection waveform; a counter for counting an output pulse of a reference oscillator by the leading edge of an output pulse of the demultiplier; a memory circuit such as a read only memory (ROM) for storing bit data using output data of the counter as an address; an OR gate for performing an OR operation of an output of the memory circuit; a switch device for inputting the output of the memory circuit into the OR gate; and a flip-flop for operating in synchronism with the output pulse of the frequency demultiplier using an output of the OR gate as data input.

REFERENCES:
patent: 4123704 (1978-10-01), Johnson
patent: 4442406 (1984-04-01), Voss
patent: 4564837 (1986-01-01), Awano
Radio Gijutsu Sha Co., Ltd., "Digital IC Practical Circuit Manual", Jul. 10, 1974, pp. 416-417.

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