A Temperature- and Aging-Compensated TMR Current Sensor with ±0.13% Sensitivity Variation from -40°C to 120°C

📋 论文概要

该论文提出了一种基于TMR的接触式电流传感器，通过灵敏度稳定环路和内置应力传感器分别补偿温度和老化引起的灵敏度漂移。实验结果表明，在-40°C至120°C范围内灵敏度变化仅为±0.13%，老化漂移降低至0.1%。

💡 主要创新点

• 提出灵敏度稳定环路，连续调整TMR灵敏度，使残余漂移仅依赖于片上曲率校正电流参考。
• 内置应力传感器，用于进一步补偿电流参考源因老化引起的漂移。

🏷 关键词

📄 原文摘要

Abstract This paper presents a TMR-based contactless current sensor that mitigates sensitivity drift due to temperature and aging. The proposed sensitivity stabilization loop continuously adjusts the TMR sensitivity, making residual drift dependent only on the on-chip curvature- corrected current reference (IREF). A built-in stress sensor is used to further compensate the aging-induced drift of IREF. These techniques achieve ±0.13% sensitivity variation from -40°C to 120°C and reduce the aging drift to 0.1% at 25°C. High-precision contactless current sensors have gained increasing adoption in power inverters, electricity metering, and battery management systems owing to their inherent safety, reliability, and galvanic isolation. A low-noise, low-offset, and linear sensor interface with excellent energy efficiency is an essential prerequisite. For industrial applications, even more important is that sensors must not only ensure minimal sensitivity drift (<1%) across

👥 作者与机构

Tianxiang Qu, Nan Wang, Kaiwen Zhou, Jiayao Liu, Longxi Xiang, Mingqian Sun, Zhiliang Hong, Xiaoyang Zeng, Jiawei Xu

Fudan University, Shanghai, China