Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-12-13
1978-08-15
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78D, 324186, 324187, G01R 2302
Patent
active
041076001
ABSTRACT:
In a system for converting information in the form of an AC frequency to digital data, a binary number having a magnitude proportional to the frequency is derived by generating a stream of pulses at a known clock rate and counting the number of pulses occurring during a specified period of the AC frequency. A high degree of accuracy is achieved by varying the clock rate as a function of the frequency of the AC signal such that an optimum numeric count is reached. The counter counts the duration of the first half period of the first cycle of the AC signal at a first fixed clock rate. The most significant bits of the generated count are input as a scaling factor to a binary rate multiplier which increases the clock rate in proportion to the magnitude of the scaling factor. The duration of the first half period of the succeeding cycle of the AC signal is then counted at the new rate. The scaling factor and second generated count may be input to a microprocessor which computes the frequency of the AC signal according to stored formulae. An overflow latch may be provided to store counter overflow and provide a signal to the microprocessor that the frequency of the input signal is below a minimum usable range.
REFERENCES:
patent: 3731194 (1973-05-01), Favin
patent: 3787802 (1974-01-01), Brahman
patent: 4020418 (1977-04-01), Burrage
patent: 4025868 (1977-05-01), Miki et al.
General Electric Company
Johnson, Jr. James W.
Lawrence Derek P.
Tokar M.
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