User-Defined Power Distribution for Capacitive Wireless Power Transfer With Multiple Receivers

Capacitive power transfer allows for wireless charging of multiple devices at once. In a typical system, the amount of power delivered to the different devices is determined by their position and distance to the transmitter. However, it can be beneficial to prioritize the charging of the devices. For example, if a critical device has a low battery status, the system should be able to prioritize the charging of this specific receiver above other nearly fully charged devices, even if the position or distance of this receiver is not optimal. In this work, we present a methodology to realize a user-defined power distribution to an arbitrary number of receivers within a capacitive wireless power transfer system. It applies admittance inverters in each receiver to regulate the power delivery. The results are numerically validated in the simulation program LT Spice on an illustrative system.