Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1981-05-19
1984-06-26
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324130, G01R 2106, G01R 102
Patent
active
044568789
ABSTRACT:
An electronic watthour meter including a pulse width modulation circuit for converting a voltage signal proportional to the load voltage across the power supply lines to a pulse width duty cycle signal and a current-to-voltage converter for converting a current signal proportional to the load current across the power supply lines to a voltage signal. A multiplication circuit issues the product of the voltage signals under the control of the pulse width duty cycle signal as a pulse signal proportional to the instantaneous power consumption of the power supply lines. A filter circuit integrates the pulse signal of the multiplication circuit as an integrated voltage signal. A voltage-to-frequency converter converts the integrated voltage signal to a pulse signal proportional to the consumption power of the power supply lines. An automatic compensation circuit integrates the pulse signal of the voltage-to-frequency converter as a feedback signal to the input of the voltage-to-frequency converter thereby eliminating the inherent offset voltage caused by the pulse width modulation circuit, the current-to-voltage converter and the voltage-to-frequency converter.
REFERENCES:
patent: 3070786 (1962-12-01), MacIntyre
patent: 3955138 (1976-05-01), Milkovic
German DE-Z, "Internationale Elektron Rundschau", 1968, Nr. 12, S. 330.
German DE-Z: "Landis & Gyr-Mitteilungen", 19, 1972, Heft. 1, S. 9-16.
German DE-Z, "Siemens-Zeitschrift", 47, 1973, Heft 4, S. 280-283.
Karlsen Ernest F.
Tokyo Shibaura Denki Kabushiki Kaisha
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