Analysis, Experimental Results, and Range Adaptation of Magnetically Coupled Resonators for Wireless Power Transfer

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Wireless power technology offers the promise of cutting the last cord, allowing users to seamlessly recharge mobile devices as easily as data is transmitted through the air. Initial work on the use of magnetically coupled resonators for this purpose has shown promising results. The authors present new analysis that yields critical insight into design of practical systems, including the introduction of key figures of merit that can be used to compare systems with vastly different geometries and operating conditions. A circuit model is presented along with a derivation of key system concepts such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes under-coupled.