Journal
SENSORS
Volume 19, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s19081882
Keywords
giant magnetoresistance (GMR); spin-valve; current measurement; AC modulation
Funding
- Ministry of Science and Technology, Taiwan (ROC) [MOST 106-2221-E-151-025, MOST 106-2221-E-027-060]
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A non-contact current measurement device comprised of a GMR sensor and a ferrite ring core was investigated. The sensor chip employed a high-sensitivity spin-valve full-bridge GMR sensor of which the direct output has non-negligible hysteresis and a limited linear range. By applying an AC modulation current to modulate the output of the GMR sensor, the hysteresis was reduced, and the linear range was over +/- 0.5 A. The resolution for DC and quasi-static current measurement was 0.1 mA at a 10 Hz bandwidth. The output in proportion to the measured current was obtained either by demodulating the current-sensitive AC signal or by employing the filtered output of the intrinsically nonlinear spin-valve response. The proposed current sensing scheme is suitable for quasi-static current measurement from DC to over 100 Hz.
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