The goal of this project was to develop a low-cost, wireless sensor that measures the AC current, voltage, and real power of wall outlet electrical devices. To reduce sensor cost, size, and power dissipation, a PCB-printed induction coil was used for non-intrusive current measurement.
The inductive current sensing scheme enabled >10x reduction in sensor thickness and 10-100x decrease in sensor power dissipation, compared to conventional plug load sensors that utilize resistive current sensing.
Publication (PDF): Lorek, M. C., Chraim, F., & Pister, K. S. (2015, November). Plug-through energy monitor for plug load electrical devices. In SENSORS, 2015 IEEE (pp. 1-4). IEEE.