Modeling and Optimization of Magnetic Energy Harvesters with Field Shaping Capacitors for Energy Ethernet Applications

This paper presents a comprehensive circuit analysis method for the operation of magnetic energy harvesters with field shaping capacitors (FSC) feeding constant voltage load. The Chan model is used to model the saturation behaviour of the magnetic core and then a circuit model for the magnetic energy harvester with nonlinear inductance is constructed. Detailed analysis on the circuit operation and state transitions are provided. A mathematical model is established to replace the circuit model so that the optimization of the system parameters, such as number of turns, load voltage, could be carried out numerically. Simulation results are followed subsequently to demonstrate the effectiveness of the proposed circuit model.