Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1985-05-15
1988-01-19
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 42, 377 55, 377111, 364483, 340347NT, G01R 2106, H03M 156
Patent
active
047208414
ABSTRACT:
A circuit for providing an indication of watt-hours from a voltage input that is an analog of watts comprises a source of a high-frequency square wave and a precision triangular wave at a frequency that is derived from the high-frequency square wave by frequency division. A time interval is derived by selecting a period between a time when the triangular wave crosses zero volts and the time at which the amplitude of the triangular wave equals the analog input voltage. A count of the number of cycles of the high-frequency signal during that interval provides a measure of the value of the input voltage, and a continuing count of that number of cycles provides a time-integrated value of the count. When the input signal is analogous to watts, the integrated output provides a measure of watt-hours.
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"Combined ADC-DAC" by Bares et al., IBM Technical Disclosure Bulletin, vol. 10, No. 9, Feb. 1968.
Heyman John S.
Johnston A. Sidney
Square D Company
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