A Novel Open-Loop Current Sensor Based on Multiple Spin Valve Sensors and Magnetic Shunt Effect with Position...

Area of Science:

• Electrical Engineering
• Materials Science
• Physics

Background:

• Current measurement demands high precision and wide ranges, particularly in emerging fields.
• Existing sensors face limitations in simultaneously achieving both wide range and high accuracy.
• Spin sensing technology offers potential for sensitive magnetic field detection.

Purpose of the Study:

• To develop a novel current sensor design for wide-range and high-precision measurements.
• To integrate spin sensing, magnetic shunting, and data fusion for enhanced performance.
• To address limitations of current sensor technologies in demanding applications.

Main Methods:

• Utilized spin valve sensors to detect magnetic fields from signal current.
• Employed a soft magnetic shunt structure to attenuate magnetic fields for sensor compatibility.
• Implemented a multi-sensor data fusion algorithm (averaging) with four spin valve sensors.
• Investigated error calibration for current-carrying wire displacement and tilt.

Main Results:

• Extended the detection current range by 6.8 times.
• Achieved a sensitivity of 61.6 mV/V/A.
• Demonstrated excellent linearity of 0.55%.
• Exhibited robust measurement performance and strong anti-interference capability.

Conclusions:

• The proposed current sensor design effectively integrates spin sensing, magnetic shunting, and data fusion.
• The sensor achieves a significant improvement in both measurement range and precision.
• This technology offers a viable solution for high-precision, wide-range current measurement in new energy vehicles and precision metering.