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A study on cable current detection for new energy charging stations based on TMR sensor arrays
Jicheng Yu1, Siyuan Liang2, Changxi Yue1
1China Electric Power Research Institute, Wuhan, 430074, China.
Scientific Reports
|June 12, 2026
Summary
A new tunnel magneto-resistance (TMR) sensor array offers accurate, non-contact, real-time current measurement for electric vehicle charging cables. This innovation enhances charging station performance, safety, and economic viability.
Area of Science:
- Electrical Engineering
- Materials Science
- Sensor Technology
Background:
- Accurate current measurement is crucial for AC charging station performance, economics, and safety.
- Existing methods may lack precision or non-contact capabilities for real-time monitoring.
Purpose of the Study:
- To design and validate a tunnel magneto-resistance (TMR) sensor array for non-contact, real-time current monitoring in electric vehicle charging cables.
Main Methods:
- Development of a TMR sensor array specifically for charging cable current detection.
- Experimental validation comparing the array's performance against a single TMR sensor.
- Testing the sensor array's real-time monitoring capability across various electric vehicle models.
Main Results:
- The TMR sensor array demonstrated superior performance compared to a single TMR sensor.
- Optimal detection accuracy was achieved at a 3 cm distance from the charging cable.
- The sensor array successfully monitored real-time current for ten different electric vehicle brands and models.
Conclusions:
- The proposed TMR sensor array provides a reliable, high-precision, and stable solution for non-contact, real-time charging cable current detection.
- This technology can significantly improve the design, manufacturing, and operation of AC charging stations.
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