Electric energy metering system and method with magnetic field immunity

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By using a dual-core multi-winding current transformer and an active compensation control loop, the accuracy problem of power metering equipment under magnetic field interference was solved, achieving high-precision and miniaturized power metering.

CN120522450BActive Publication Date: 2025-11-18YANTAI DONGFANG WISDOM ELECTRIC

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Patent Information

Application Number: CN202511028386.1
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2025-07-25
Publication Date: 2025-11-18
Estimated Expiration: 2045-07-25

Application Information

Patent Timeline

25 Jul 2025

Application

CN202511028386.1

18 Nov 2025

Publication

CN120522450B

IPC: G01R22/10; G01R15/18; G01R15/00

CPC: G01R22/10; G01R22/061; G01R15/186; G01R15/00

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Application Domain

Voltage/current isolation

Technology Topics

Control engineering Transformation unit

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AI Technical Summary

Technical Problem

Existing electricity metering equipment lacks metering accuracy under magnetic field interference, and existing shielding measures suffer from problems such as large size, complex process, and low yield.

Method used

A dual-core, multi-winding current transformer is used, combined with external magnetic field detection, active compensation control, and a miniature power amplifier to construct a current compensation control loop. External magnetic field interference is canceled out through differential winding detection and reverse magnetic flux.

Benefits of technology

It achieves high-precision power metering, has a simple structure, is easy to produce, has a reduced equipment size, effectively suppresses magnetic field interference, and ensures metering accuracy.

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Abstract

The application discloses a kind of electric energy metering system and method with magnetic field anti-interference ability, belong to electric energy metering technical field.The system includes current connection terminal, multi-winding current transformer, first analog-digital conversion unit, voltage connection terminal, voltage division conversion unit, second analog-digital conversion unit and electric energy metering unit, further include external magnetic field detection unit, active compensation control unit and micro power amplifier.The multi-winding current transformer of the application adopts the structure of double magnetic core+multi-winding, which can effectively detect magnetic field interference current, and also can realize accurate compensation, and has the advantages of simple structure, small size, etc.The active compensation control unit of the application accurately extracts interference signals through multi-stage feedback filter and four-stage comb filter, and combines active compensation control, which can effectively suppress the interference components in the difference current and ensure the accuracy of measurement.

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