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Development of compact wireless power transfer (WPT) systems for chargingminiature randomly oriented electronic devices is quite a challenge.Traditionally, WPT systems based on resonant magnetic coupling utilizeface-to-face aligned transmitter and receiver coils providing sufficientefficiency at relatively large distances. However, with the presence of angularreceiver misalignment in a such system, the mutual coupling decreases resultingin a low power transfer efficiency. Here we develop a compact WPT system forwireless charging of miniature receivers vertically oriented with respect tothe transmitter. As a transmitter, we employ a butterfly coil that provides astrong tangential component of the magnetic field. Thus, a vertically orientedreceiver located in the magnetic field can be charged wirelessly. We performnumerical and experimental studies of the WPT system power transfer efficiencyas a function of the distance between the transmitter and the receiver. Themisalignment and rotation dependencies of power transfer efficiency are alsoexperimentally studied. We demonstrate the power transfer efficiency of 60 %within transfer distance of 4 mm for a vertically oriented receiver with anoverall dimension of 20 mm X 14 mm at the frequency of 6.78 MHz.

Miniature Wireless Power Transfer System for Charging Vertically Oriented Receivers