Title :
A Giant Magneto Resistive (GMR) Effect Based Current Sensor With a Toroidal Magnetic Core as Flux Concentrator and Closed-Loop Configuration
Author :
Xiaoguang Yang ; Hang Liu ; Yuanyuan Wang ; Youhua Wang ; Guoya Dong ; Zhenghan Zhao
Author_Institution :
Province-Minist. Joint Key Lab. of Electromagn. Field & Electr. Apparatus Reliability, Hebei Univ. of Technol., Tianjin, China
Abstract :
This paper presents a novel current sensor, which includes a giant magnetoresistance (GMR) chip, a toroidal magnetic core, and a feedback winding on the core. The mathematical model of the sensor was built, which was used to analyze the influence factors of the closed-loop current sensor. The closed-loop configuration with the magnetic core and the feedback winding improved the sensitivity of the sensor, eliminated the offset and drift related to temperature of the chip, and greatly reduced the error caused by magnetic hysteresis phenomenon. The simulation and test results showed that the novel current sensor has very low linear error (less than ± 0.7%). The designed sensor can measure frequency of currents up to 100 kHz. The current sensor has high linearity with the range from 10 mA to 20 A.
Keywords :
electric current measurement; giant magnetoresistance; magnetic cores; magnetic hysteresis; magnetic sensors; closed-loop configuration; current 10 mA to 20 A; current sensor; feedback winding; flux concentrator; frequency 100 kHz; giant magnetoresistance chip; giant magnetoresistive effect; linear error; magnetic hysteresis; mathematical model; sensor sensitivity; toroidal magnetic core; Current measurement; Integrated circuits; Magnetic cores; Magnetic hysteresis; Sensitivity; Toroidal magnetic fields; Windings; Closed-loop; Giant magnetoresistance (GMR); current sensor; toroidal magnetic core;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2286396
