Electrical pulse counters – pulse dividers – or shift registers: c – Systems – With programmable counter
Patent
1989-08-01
1991-02-12
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
With programmable counter
328140, 307524, 318599, 377 2, G06M 302, G01R 2315
Patent
active
049930524
ABSTRACT:
A digitally-operating electrical appliance or equipment which is adapted to automatically handle power-supply or line frequencies of 50 Hz or 60 Hz. A full wave of the power-supply frequency is utilized for the generating of a waveform having a pulse referenced thereto. A pulse sequence which is generated independently of the power-supply frequency and is of an essentially higher frequency than the former is counted into a counter, and the content of the counter is thereafter discriminated at a threshold value of about 55 Hz. Depending upon the obtained result, a first signal is generated which is associated with the frequency of 50 Hz, or a second signal is generated which is associated with the frequency of 60 Hz, wherein the signals correspondingly switch a frequency divider to either a dividing ratio of 50:1 or 60:1 such that at the output of the frequency divider, independently of the power-supply frequency, there are generated pulses of a constant frequency for the synchronized power supply of the appliance.
REFERENCES:
patent: 3867614 (1975-02-01), White
patent: 4052676 (1977-10-01), Crittenden
patent: 4276468 (1981-06-01), Nagamoto et al.
patent: 4339722 (1982-07-01), Sydor et al.
patent: 4438405 (1984-03-01), Yazawa et al.
patent: 4769611 (1988-09-01), Frierdich
patent: 4823060 (1989-04-01), Doemen
Diehl GmbH & Co.
Heyman John S.
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