A Giant Magneto Resistive (GMR) Effect Based Current Sensor With a Toroidal Magnetic Core as Flux Concentrator and Closed-Loop Configuration

作者：Yang, Xiaoguang^*; Liu, Hang; Wang, Yuanyuan; Wang, Youhua; Dong, Guoya; Zhao, Zhenghan

来源：IEEE Transactions on Applied Superconductivity, 2014, 24(3): 9000305.

DOI：10.1109/TASC.2013.2286396

• Closed-loop
• current sensor
• Giant magnetoresistance (GMR)
• toroidal magnetic core

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.

• 出版日期2014-6
• 单位河北工业大学