Specialized receivers for three-phase contactless energy transfer desktop applications

In this paper, a new contactless energy transfer (CET) desktop application is presented. The CET desktop uses a matrix of hexagon spiral windings embedded underneath its surface, to transfer power to CET enabled consumer electronics devices placed on the table. To improve efficiency and limit stray magnetic fields, clusters of only three primary coils, located closest to the receiving devices, are excited. The coils are excited with out-of-phase currents to further reduce stray magnetic fields. Due to the design of the CET desktop the power transfer efficiency is not constant but varies throughout the surface of the table. Using the design and evaluation process presented in this paper, different secondary coil configurations can be designed and evaluated to find topologies best suited for different electronic devices. The evaluation process is simulated for two different receiver coil assemblies, and from the results it is shown that receiver coil configurations with multiple small coils have the ability to stabilize the power transfer efficiency in the CET desktop.