Self-calibration method of tunneling magnetoresistive (TMR) sensor and TMR sensor array for current measurement

Through the dual Wheatstone bridge structure and the self-calibration method of TMR sensor array, the measurement error problem of traditional TMR sensors under the influence of environmental factors is solved, and high-precision and stable magnetic field and current measurement are achieved.

CN120490937APending Publication Date: 2025-08-15广西电网有限责任公司桂林供电局
0 Cites 2 Cited by

Patent Information

Application Number
CN202510577322.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-06
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

Traditional TMR sensors are affected by environmental factors in high sensitivity, low power consumption and high accuracy measurements, resulting in measurement errors, especially in long-term stability and self-calibration challenges.

Method used

The dual Wheatstone bridge structure is adopted, and the output voltage ratio of the bridge to be tested and the reference bridge is calculated, combined with the known reference magnetic field, the self-calibration of the TMR sensor is realized, and errors caused by factors such as temperature, magnetic field fluctuations, humidity changes and mechanical vibration are eliminated; the TMR sensor array is constructed, and multiple sensor units are used to form an array to improve spatial resolution and fault tolerance.

Benefits of technology

The stability and high-precision measurement of TMR sensors in complex environments are realized, and the self-calibration module adjusts the compensation for deviations caused by environmental factors in real time, improving the accuracy of measurement and the system's response capabilities.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a self-calibration method of a TMR (Tunnel Magnetoresistive) sensor and a TMR sensor array for current measurement, and relates to the technical field of quantum current sensors. According to the method, a double Wheatstone bridge structure is adopted, a to-be-measured bridge is used for measuring a to-be-measured magnetic field, and a reference bridge is used for measuring a known reference magnetic field; the self-calibration of the TMR sensor is realized by calculating the ratio of the output voltages of the two bridges, so that measurement errors caused by environmental factors such as temperature, humidity and mechanical vibration are eliminated; moreover, the invention provides a TMR sensor array for current measurement, the application of the TMR sensor array further enhances the adaptive capacity of the TMR sensor array in a complex environment, and the array is formed by a plurality of TMR sensor units, so that not only can the spatial resolution of measurement be improved, but also the fault-tolerant capability of the system can be improved through redundancy configuration, and the system reliability is improved. The array structure enables the TMR sensor to perform accurate measurement at a plurality of measurement points at the same time to obtain accurate measurement current.
Need to check novelty before this filing date? Find Prior Art