Non-Invasive Integrated Device for Multi-Core Cable Current Measurement Based on TMR Sensor Array

Current information serves as the foundation for monitoring and controlling power systems. Convenient acquisition of multi-core cable current information is crucial. Therefore, miniaturized and easy-to-install non-invasive sensing devices have become a hot research topic in the field of current measurement. Currently, magnetic sensors are small in size, but the backend processing modules are relatively large, which brings inconvenience to current measurement. Integrated technology is needed to reduce the size of the backend processing module. Consequently, this paper proposes an integrated solution for non-invasive current sensing devices. It designs an integrated device consisting of tunneling magnetoresistance (TMR) differential sensor array, an instrumentation amplifier, a data acquisition board, and a Raspberry Pi. The performance of the integrated device is verified through experiments.