Electric-vector included angle measurement circuit and electric energy meter

Abstract

The invention belongs to the electric energy metering field and provides an electric-vector included angle measurement circuit and an electric energy meter. According to the invention, a first quasi zero crossing point time coordinate data generation module and a second quasi zero crossing point time coordinate data generation module are used to detect and correct approximated zero crossing point time coordinate data of a sinusoidal signal and outputs quasi zero crossing point time coordinate data respectively. An electric-vector included angle calculator is used to calculate electric-vector included angles of two quasi zero crossing point time coordinate data so as to obtain electric-vector included angle data. An electric-vector included angle measurement result does not influenced by a used sinusoidal signal zero crossing point time coordinate obtaining method and a sampling number of an analog-to-digital converter so that the electric-vector included angle measurement result satisfies a precision measurement requirement.

Description

technical field [0001] The invention belongs to the field of electric energy measurement, in particular to an electric vector angle measurement circuit and an electric energy meter. Background technique [0002] Electric vector angle, that is, the phase angle difference between sinusoidal electrical signals, is a very important parameter in electrical measurement. In the field of electric energy measurement, accurate measurement of electric vector angle is helpful to realize fast correction of electric energy meter. In the prior art, the digital circuit for measuring the electric vector angle is all by detecting the zero-crossing jump data in the sinusoidal signal data stream output by the analog-to-digital converter, and approximately considering the time of the detected zero-crossing jump data The coordinates are the time coordinates of the zero-crossing point of the sinusoidal signal, and then calculate the time difference between the zero-crossing points of the two sinu...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of electric vector included angle measuring circuit, aim at solving the influence of the time coordinate acquisition method of adopted sinusoidal signal zero-crossing point and the number of analog-to-digital converter sampling points in the prior art, the electric vector included angle measurement result The accuracy cannot meet the precision measurement requirements

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