Electronic type watthour meter including automatic measuring-err

Details Electronic type watthour meter including automatic measuring-err Electronic type watthour meter including automatic measuring-err

1992-02-21

1993-09-28

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324103R, 340637, 364483, G01R 1132, G06G 716

Patent

active

052489353

ABSTRACT:
An electronic type watthour measuring apparatus equipped with an automatic measuring-error correcting circuit. The electronic type watthour measuring apparatus includes: a power-to-voltage (W/V) converter for converting electrical power supplied from a power source into a voltage signal corresponding to the electrical power; a voltage-to-frequency converter for converting the voltage signal derived from the W/V-converter into a frequency signal corresponding to the voltage signal and indicative of the electrical power with an error; a calculator for calculating a difference between the frequency of the frequency signal and a frequency of a reference signal derived from a reference watthour meter while measuring the same electrical power from the power source; and a controller for controlling the voltage signal outputted from the W/V-converter based on the difference in the frequencies of both the frequency signal and reference signal so as to eliminate the error contained in the electric power measured by the electronic type watthour measuring apparatus.

REFERENCES:
patent: 4165485 (1979-08-01), Takahashi
patent: 4224671 (1980-09-01), Sugiyama et al.
patent: 4534045 (1985-08-01), Collier
patent: 4920312 (1990-04-01), Maruyama

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