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1. (WO2013118482) POWER TRANSMISSION COIL

Pub. No.:    WO/2013/118482    International Application No.:    PCT/JP2013/000597
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Tue Feb 05 00:59:59 CET 2013
IPC: H01F 38/14
H02J 17/00
Applicants: PANASONIC CORPORATION
パナソニック株式会社
Inventors: WERNER, Steffen
ヴェルナー シュテフェン
IWAMIYA, Hiroki
岩宮 裕樹
MIYAKE, Eiji
三宅 英司
Title: POWER TRANSMISSION COIL
Abstract:
Provided is a power transmission coil that can suppress the effects when the dimensions of the coil bodies are incorrect, and the positions of both coils are offset. There are a first planar coil having an inner diameter (Di) and a second planar coil that is placed opposite the first planar coil and has an outer diameter (Do). The value of the outer diameter (Do) of the second planar coil divided by the inner diameter (Di) of the first planar coil is the outer-to-inner diameter ratio (Do/Di). The rate of change of the coupling coefficient between the first planar coil and the second planar coil is the rate of change (Δk) of the coupling coefficient. In the correlation relationship between the outer-to-inner diameter ratio (Do/Di) and the rate of change (Δk) of the coupling coefficient, the inner diameter (Di) of the first planar coil and the outer diameter (Do) of the second planar coil are determined to be less than the value of the outer-to-inner diameter ratio (Do/Di) when the gradient of the correlation relationship is rapidly increasing.