A power feeding apparatus, power receiving apparatus, wireless power feeding system, and method for wireless transfer of power are provided. The power feeding apparatus includes an impedance detector, a controller, a power transmitter, a variable matching circuit, and a signal transmitter. The controller is configured to provide first control information and second control information based on an impedance detected by the impedance detector. The power feeding apparatus' variable matching circuit is configured to change a variable diameter of a power feeding coil according to the first control information. The power receiving apparatus includes a power receiver, a signal receiver, and a variable matching circuit. The power receiving apparatus' variable matching circuit is configured to change a variable diameter of a power feeding coil according to the second control information provided by the power feeding apparatus.

Title
Power feeding apparatus, power receiving apparatus, wireless power feeding system and method for wireless transfer of power
Leistungsversorgungsvorrichtung, Leistungsempfangsvorrichtung, drahtloses Leistungsversorgungssystem und Verfahren zur drahtlosen Leistungsübertragung
Appareil dalimentation de puissance, appareil de réception de puissance, système dalimentation de puissance et procédé pour transfert de puissance sans fil
Application Number
EP20110002756 20110401
Publication Number
2375568 (A2)
Application Date
April 1, 2011
Publication Date
October 12, 2011
Inventor
MURAYAMA YUJI
JP
MIYAMOTO TAKASHI
JP
KOZAKAI OSAMU
JP
Assignee
SONY
JP
IPC
H03F 01/56
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