Recently, technologies of wireless power transfer (WPT) using magnetic field resonance coupling have been studied and developed for consumer electrical appliances, and charging systems of electric vehicles, among other applications. This paper reports on recent advances and applications in wireless power transfer on power-magnetics. First, advanced technologies of direct-current (DC)-resonance WPT which has an ability of generating electromagnetic field resonance from DC power source using switching power conversion circuit are described. Second, recent advances in electromagnetic field analysis for WPT are described. Finally, advanced technologies of optimum design and the layouts of transmitting and receiving coils are introduced.
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