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Simulation of a resonant inductive wireless charger

A detailed finite element simulation of an inductive resonant wireless power transfer system is presented. This simulation is based on the BQTesla development board for validation and allows an analysis on the system and its limitations. The power transfer efficiency is influenced by the coupling factor of the coils, which in turn depends on the position and geometry of the coils relative to each other. The materials used in the shielding of the coils also play a significant role in determining the coupling factor. From this point the model can be used to simulate various situations, for example increased air gap between coils, different angles at which the coils are placed, different materials and geometries. These changes can also influence the resonant frequency and their influence can be quantified.