Apparatus for automatically recognizing a frequency of a power s

Details Apparatus for automatically recognizing a frequency of a power s Apparatus for automatically recognizing a frequency of a power s

1993-02-22

1995-02-21

Snow, Walter E.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 7648, G01R 2310

Patent

active

053919823

ABSTRACT:
An apparatus for recognizing a frequency of an electric power being applied to an electric/electronic device for preventing an error operation of the electric/electronic device generated when the frequency of power supply to be applied differs from the operating frequency determined at the time of manufacture of the electric/electronic device. The apparatus has a power transformer for transforming commercial alternating current power supply to a driving voltage of the device, a period detecting section for shaping a wave form of output of the power transformer, and simultaneously generating a period detecting signal at every period of that output wave form, and a control section for counting a number of times said period detecting signal is generated during a predetermined time period, whereby the frequency of the applied power supply on basis of the number of times.

REFERENCES:
patent: 3697781 (1972-10-01), McLean
patent: 3710262 (1973-01-01), Sorenson
patent: 4760536 (1988-07-01), Curtis
patent: 4769611 (1988-09-01), Frierdich
patent: 4800508 (1989-01-01), Frederich
patent: 4928052 (1990-05-01), Fujioka et al.
patent: 4993052 (1991-02-01), Hammelsbacher
patent: 5253179 (1993-10-01), Rickett

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