中圖分類號：TP212.6 文獻標志碼：A DOI: 10.16157/j.issn.0258-7998.256811
中文引用格式： 陳啟慧，謝志遠，劉繼志. 基于FPGA高精度磁通門傳感器的設計與校準研究[J]. 電子技術應用，2025，51(12)：56-61.
英文引用格式： Chen Qihui，Xie Zhiyuan，Liu Jizhi. Research on the design and calibration of high-precision fluxgate sensor based on FPGA[J]. Application of Electronic Technique，2025，51(12)：56-61.

Research on the design and calibration of high-precision fluxgate sensor based on FPGA

Abstract： Aiming at the problem of significant nonlinear error of traditional fluxgate sensor in wide range current measurement, a collaborative correction method based on field programmable gate array (FPGA) high-precision time difference detection and polynomial dynamic compensation is proposed. In this study, by establishing the mapping relationship between the positive and negative saturation time difference of the magnetic core and the measured current, a digital FPGA processing architecture is constructed to capture the saturation time difference in real time, and a polynomial compensation model including nonlinear effects is established. The experimental results show that this sensor can precisely detect complex and weak leakage currents. The determination coefficient R2 of the compensation model is 0.999 976, which is 0.11 percentage points higher than that of the linear model. The root mean square error is reduced by 85.4 %. Through hardware-algorithm collaborative optimization, the accuracy drift in industrial field environment is effectively suppressed, which provides a high-precision and low-cost solution for device-level current monitoring of smart grid.

Key words : FPGA；fluxgate sensor；time difference method；nonlinear compensation