Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1989-08-15
1990-12-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324141, 364483, G01R 712, G01R 2106, G01R 21133
Patent
active
049806343
ABSTRACT:
An electric power measuring system wherein the current and voltage components are converted to respective digital signals which are multiplied and integrated to obtain a measurement of total power consumed. The current signal is developed by an A-to-D converter of the successive-approximation type, but differing from conventional such converters in employing two (or more) DACs in the feedback path where the analog feedback signal is developed for comparison with the analog current measurement signal. The two DACs are interconnected in such a way that the feedback signal is proportional to the square of the digital signal produced by the successive-approximation register (SAR). The final digital signal is developed by squaring the digital output of the SAR. The result is increased resolution at the low-level end of the scale, making it possible (in the particular embodiment) to achieve 1% accuracy at 1% of full scale, as well as 1% accuracy at 100% of full scale.
REFERENCES:
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patent: 4556870 (1985-12-01), Brokaw et al.
patent: 4594576 (1986-06-01), Fujii
patent: 4628257 (1986-12-01), Kusters et al.
patent: 4716361 (1987-12-01), Sheffer
patent: 4794369 (1988-12-01), Haferd
Analog Devices Inc.
Burns William J.
Eisenzopf Reinhard J.
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