Wide-range high-accuracy electric energy meter

Abstract

The invention relates to the technical field of electric energy meters, and provides a wide-range high-accuracy electric energy meter. The wide-range high-accuracy electric energy meter comprises a single-chip central processing unit and an electric energy meter metering unit, wherein the electric energy meter metering unit consists of a current sampling unit, a voltage sampling unit, an external clock unit, a wide-range metering chip and a peripheral circuit thereof; output ends of the current sampling unit and the voltage sampling unit are connected with an input end of the wide-range metering chip respectively; the wide-range metering chip is connected with the external clock unit; and an output end of the wide-range metering chip is connected with the single-chip central processing unit. In the electric energy meter, current sampling is performed by shared manganin and mutual inductor or two mutual inductors on hardware to meter current of a live wire; and an automatic current tracking technology is applied on software, the range is changed by controlling channel selection through a single-chip, the limitation to the dynamic range of the metering chip is broken through, the aim of expanding the range is fulfilled, and the development trend of wide range and high accuracy for single-phase / three-phase electric energy meter is met.

Description

technical field [0001] The invention relates to the technical field of electric energy meters, in particular to a single / three-phase wide-range high-precision electric energy meter. Background technique [0002] At present, the current range of common electric energy meters in the market generally requires the maximum current to be 4 times or more than eight times higher than the basic current. The best solution is to use a wide-range metering chip to achieve wide-range metering. This method is severely restricted by the dynamic range of the metering chip. It cannot guarantee high precision in the entire current range and cannot fully meet the market demand for wide-range high-precision electric energy meters. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings in the above-mentioned prior art, and provide a single / three-phase wide-range high-precision electric energy meter, which uses manganese copper and transformers o...

AI Technical Summary

Problems solved by technology

[0002] At present, the current range of common electric energy meters in the market generally requires the maximum current to be 4 times or more than eight times higher than the basic current. The best solution is to use a wide-range metering chip to achieve wide-range metering. This method is severely restricted by the dynamic range of the metering chip. It cannot guarantee high precision in the entire current range and cannot fully meet the market demand for wide-range high-precision electric energy meters.

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