Patent ID: 8531059

Claim:
A wireless power transfer system, comprising: a supply-side power supply coil; a supply-side magnetic resonance coil; a load-side power supply coil; and a load-side magnetic resonance coil, wherein said supply-side magnetic resonance coil is excited with electromagnetic induction, by supplying transmission electric powers of frequencies equal to magnetic resonance frequencies of said supply-side magnetic resonance coil and said load-side magnetic resonance coil to said supply-side power supply coil by means of an oscillator, thereby transferring an electric power from said supply-side magnetic resonance coil and said load-side magnetic resonance coil, wirelessly, with applying a magnetic resonance phenomenon between said supply-side magnetic resonance phenomenon between said supply-side magnetic resonance coil and said load-side magnetic resonance coil, so as to output the transmission electric power transferred to said load-side magnetic resonance coil by said load-side power supply coil with the electromagnetic induction, and wherein a distance between said supply-side magnetic resonance coil and said load-side power supply coil is shorter than a distance between said supply-side magnetic resonance coil and said load-side magnetic resonance coil, and is longer than a distance between said load-side power supply coil and said load-side magnetic resonance coil.