Title:
WIRELESS POWER FEEDER, WIRELESS POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/090701
Kind Code:
A1
Abstract:
This wireless power feeder (110) according to one embodiment of the present invention is a wireless power feeder for supplying power, without contact therewith, to a wireless power receiver (120) having a power-receiving resonant circuit (122) that contains a power-receiving coil (7) and a power-receiving capacitor (8), the wireless power feeder (110) being provided with: a power-feeding coil (1); a resonant current detector (6) for detecting the resonant current of the power-receiving resonant circuit (122); and a control circuit (111) for causing power to be supplied from the power-feeding coil (1) to the power-receiving coil (7) on the basis of the magnetic field resonance phenomenon between the power-feeding coil (1) and the power-receiving coil (7), by supplying the power-feeding coil (1) with an alternate current, and for associating the frequency of the alternate current with the frequency of the resonant current detected by the resonant current detector (6). Therein: the power-feeding coil (1) does not substantially configure a resonant circuit; the resonant current detector (6) has a detection resonant circuit (112) including a detection coil (6a) and a detection capacitor (6c), and detects the resonant current of the power-receiving resonant circuit (122) on the basis of the magnetic field resonance phenomenon between the detection coil (6a) and the power-receiving coil (7); the coiling region of the detection coil (6a) in the resonant current detector (6) is smaller than the coiling region of the power-feeding coil (1); and the detection coil (6a) in the resonant current detector (6) is positioned in a manner such that the coiling center axis thereof forms an angle of 80-100°C in relation to a magnetic field vector formed by the power-feeding coil.
Inventors:
URANO Takashi (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
Application Number:
JP2011/078813
Publication Date:
July 05, 2012
Filing Date:
December 13, 2011
Export Citation:
Assignee:
TDK Corporation (1-13-1, Nihonbashi Chuo-k, Tokyo 72, 〒1038272, JP)
ＴＤＫ株式会社 (〒72 東京都中央区日本橋一丁目１３番１号 Tokyo, 〒1038272, JP)
ＴＤＫ株式会社 (〒72 東京都中央区日本橋一丁目１３番１号 Tokyo, 〒1038272, JP)
International Classes:
H02J17/00
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (SOEI PATENT AND LAW FIRM, Marunouchi MY PLAZA 9th fl. 1-1, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
Claims:
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