Motor generator shutdown circuit for extended ridethrough

Prime-mover dynamo plants – Plural prime mover – Plural prime movers with fluid interconnection

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Details

307 86, 361 52, H02H 346

Patent

active

045216924

ABSTRACT:
This invention relates to device for detecting a threshold value of the frequency of an input signal. A gate signal is generated from the input signal, whose period has a relationship to the frequency of the input signal. A counter counts pulses from an oscillator having a predetermined rate. The gate signal enables the counter for a predetermined period of time and samples the count at the end of the period of time to determine whether the threshold value has been attained, the count stored in the counter being indicative of the frequency of the input signal.

REFERENCES:
patent: 3315148 (1967-04-01), Grillo
patent: 3990007 (1976-11-01), Hohhof
patent: 3993984 (1976-11-01), Penrod

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