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A current sensor based on the giant magnetoresistance effect: design and potential smart grid applications
Yong Ouyang1, Jinliang He, Jun Hu
1State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China. ouyy07@gmail.com
Sensors (Basel, Switzerland)
|December 4, 2012
Summary
This study presents a cost-effective giant magnetoresistance (GMR) current sensor for smart grids. The GMR sensor offers high sensitivity and linearity for real-time grid monitoring.
Area of Science:
- Electrical Engineering
- Materials Science
Background:
- Advanced sensing is crucial for smart grid implementation.
- Giant Magnetoresistance (GMR) effect offers significant potential for magnetic measurement applications.
Purpose of the Study:
- To design and characterize a GMR current sensor for smart grid applications.
- To evaluate the sensor's performance in terms of static, dynamic, and thermal properties.
Main Methods:
- Utilized a commercial analog GMR chip for sensor design.
- Conducted comprehensive characterization of sensor performance, including sensitivity, linearity, frequency response, and thermal stability.
Main Results:
- The GMR sensor demonstrated a sensitivity of 28 mV/A and linearity of 99.97% within the 0 to ±5 A range.
- Achieved a frequency response of -1.5 dB at 10 kHz and minimal amplitude change (0.0335%/°C) with thermal compensation.
Conclusions:
- The GMR current sensor exhibits excellent performance, cost-effectiveness, and suitability for smart grid real-time monitoring.
- Its high sensitivity, linearity, small size, and low cost make it a promising solution for smart grid measurements.
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