Title:
NON-CONTACT ELECTRIC POWER FEEDING SYSTEM AND METAL FOREIGN-OBJECT DETECTION APPARATUS FOR NON-CONTACT ELECTRIC POWER FEEDING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/002063
Kind Code:
A1
Abstract:
A metal foreign-object detection apparatus (7) for a non-contact electric power feeding system comprises an antenna coil (AT2), an oscillation circuit (7a) for making high-frequency current flow through the antenna coil (AT2), and a detection circuit (7b) for detecting changes in the voltage or current to be observed at either the oscillation circuit or the antenna coil. The oscillation circuit (7a) comprises components set to design values that will make oscillation be generated in oscillation conditions ranging from the condition just after an oscillation is started being generated, to just before the condition becomes a stable oscillation-continuing condition. The metal foreign-object detection apparatus (7) detects, with the detection circuit (7b), stopping of the oscillation or attenuation of the oscillation amplitude of the oscillation circuit (7a), on the basis of changes in the electrical characteristics of the antenna coil (AT2) due to a metal foreign-object being placed on an electric power feeding apparatus (1).
Inventors:
ABE, Hideaki (1048, Oaza-Kadoma, Kadoma-sh, Osaka 86, 〒5718686, JP)
Application Number:
JP2011/061636
Publication Date:
January 05, 2012
Filing Date:
May 20, 2011
Export Citation:
Assignee:
PANASONIC ELECTRIC WORKS CO., LTD. (1048, Oaza-Kadoma Kadoma-sh, Osaka 86, 〒5718686, JP)
パナソニック電工 株式会社 (〒86 大阪府門真市大字門真１０４８番地 Osaka, 〒5718686, JP)
パナソニック電工 株式会社 (〒86 大阪府門真市大字門真１０４８番地 Osaka, 〒5718686, JP)
International Classes:
H02J17/00; H02J7/00
Attorney, Agent or Firm:
ONDA, Hironori et al. (12-1, Ohmiya-cho 2-chome Gifu-sh, Gifu 31, 〒5008731, JP)
Claims:
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