??The technology to transfer power wirelessly in a variety of fields has attracted people's attention recently because it increases the convenience of many devices. There are many methods of wireless power transfer including microwaves, magnetic resonance, electric resonance, and electromagnetic induction. The method we applied is that of electromagnetic induction. We can more easily supply devices with large reserves of power by means of this method than with other techniques of power transfer. We discuss here the relationship between efficiency and the figure-of-merit in a secondary-side resonance circuit and propose a matching technique to achieve maximum efficiency.
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