The disclosure describes techniques to improve power transfer efficiency of a wireless charger through a coil alignment mechanism. A transmitter coil of a wireless charger is configured with step motors and gears, and can travel in a radial motion and towards or away from a central point to align with the receiver coil of a device across the charging surface. Further, the transmitter coil can also be moved in a direction perpendicular with respect to the charging surface which can help optimize the distance from the receiver coil. Charging efficiency and stability between the transmitter and receiver coils are measured using signal strength of packets.
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Yang, Liyu; Jia, Liang; Lakshmikanthan, Srikanth; Hwang, George; Mehta, Srenik; Shone, Rob; and Apte, Rahul, "Motorized coil wireless charger with coil alignment mechanism", Technical Disclosure Commons, (June 11, 2019)