A study on cable current detection for new energy charging stations based on TMR sensor arrays

Accurately measuring current in charging station cables is pivotal to the design, manufacturing, and operation of AC charging stations, as it directly dictates their performance, economic viability, and safety. Addressing this need, this paper designed a tunnel magneto-resistance (TMR) sensor array for the non-contact, real-time monitoring of current in new energy vehicle charging cables. The experimental results validate the superior performance of the designed TMR sensor array over a single TMR sensor, with optimal detection accuracy achieved at a distance of 3 cm from the cable. Furthermore, the sensor successfully monitored real-time current across ten distinct brands and models of new energy vehicles. These findings demonstrate that the proposed array offers a reliable solution for real-time cable current detection with its high precision, stability, and non-contact nature.