Tmr current acquisition self-calibration error compensation method, device, equipment and medium

By using a built-in reference signal source and digital signal processing technology, the error of the TMR current sensor is dynamically compensated, solving the problem of sensor accuracy decay, achieving high accuracy and long-term stability, and reducing maintenance frequency.

CN121831657BActive Publication Date: 2026-06-19STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Patent Information

Application Number
CN202610312297.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-16
Publication Date
2026-06-19
Estimated Expiration
2046-03-16

AI Technical Summary

Technical Problem

Existing TMR current sensors lack an adaptive calibration mechanism, which leads to a continuous deterioration in measurement accuracy throughout their lifespan, affecting the reliability of monitoring data.

Method used

By dynamically injecting reference signals through a built-in standard signal excitation source module, and combining high-precision sampling circuits and digital signal processing technology, the signal differences are analyzed in real time to establish a multi-dimensional error vector and a dynamic compensation matrix, thereby achieving adaptive error compensation.

Benefits of technology

It achieves a measurement accuracy of ±0.1% throughout its entire life cycle, eliminates the effects of material time-varying and environmental interference, improves the long-term stability and environmental adaptability of the sensor, and reduces the need for on-site calibration.

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Abstract

This invention relates to a method, apparatus, device, and medium for self-calibration error compensation in TMR current acquisition. The method dynamically injects a reference signal into the TMR current acquisition circuit through a built-in standard signal excitation source module; synchronously acquires the mixed response of the original signal and the reference signal; separates the original signal and the reference signal in the mixed response using digital signal processing technology to obtain the measured values ​​of the original signal and the reference signal; analyzes the difference between the measured values ​​of the reference signal and the reference signal in real time, establishes a multi-dimensional error vector, and obtains a dynamic error compensation matrix. The dynamic error compensation matrix includes a compensation amplitude term, a compensation phase term, and a compensation harmonic distortion term, with adaptive weight coefficients for each term determined based on the signal-to-noise ratio, phase difference, and frequency, respectively; and dynamically corrects the measured value of the original signal based on the dynamic error compensation matrix to achieve adaptive error compensation. Compared with existing technologies, this invention has advantages such as the ability to achieve adaptive calibration.
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