Power feeding coil unit and wireless power transmission device
First Claim
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1. A power feeding coil unit for wirelessly feeding power, comprising:
- a first power feeding coil and a second power feeding coil that are apposed, the first power feeding coil and the second power feeding coil generate a first magnetic flux;
a first auxiliary coil on a rear side of the first power feeding coil, the first auxiliary coil generates a second magnetic flux interlinking with the first power feeding coil; and
a second auxiliary coil on a rear side of the second power feeding coil, the second auxiliary coil generates a third magnetic flux interlinking with the second power feeding coil, whereinthe first magnetic flux interlinks with the first power feeding coil and the second power feeding coil due to a magnetic field generated by the first power feeding coil and a magnetic field generated by the second power feeding coil,an axial direction of the first auxiliary coil is nonparallel to an axial direction of the first power feeding coil,an axial direction of the second auxiliary coil is nonparallel to an axial direction of the second power feeding coil, anda direction of circulation of the second magnetic flux and the third magnetic flux are opposite to a direction of circulation of the first magnetic flux.
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Abstract
A power feeding coil unit includes a first power feeding coil and a second power feeding coil that generate a first magnetic flux, a first auxiliary coil that generates a second magnetic flux interlinking with the first power feeding coil, and a second auxiliary coil that generates a third magnetic flux interlinking with the second power feeding coil. An axial direction of the first auxiliary coil is nonparallel to an axial direction of the first power feeding coil, and an axial direction of the second auxiliary coil is nonparallel to an axial direction of the second power feeding coil. A direction of circulation of the second and third magnetic fluxes are opposite to a direction of circulation of the first magnetic flux.
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Citations
16 Claims
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1. A power feeding coil unit for wirelessly feeding power, comprising:
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a first power feeding coil and a second power feeding coil that are apposed, the first power feeding coil and the second power feeding coil generate a first magnetic flux; a first auxiliary coil on a rear side of the first power feeding coil, the first auxiliary coil generates a second magnetic flux interlinking with the first power feeding coil; and a second auxiliary coil on a rear side of the second power feeding coil, the second auxiliary coil generates a third magnetic flux interlinking with the second power feeding coil, wherein the first magnetic flux interlinks with the first power feeding coil and the second power feeding coil due to a magnetic field generated by the first power feeding coil and a magnetic field generated by the second power feeding coil, an axial direction of the first auxiliary coil is nonparallel to an axial direction of the first power feeding coil, an axial direction of the second auxiliary coil is nonparallel to an axial direction of the second power feeding coil, and a direction of circulation of the second magnetic flux and the third magnetic flux are opposite to a direction of circulation of the first magnetic flux. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification
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Current AssigneeTDK Corporation
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Original AssigneeTDK Corporation
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InventorsChiyo, Noritaka, Kamono, Takeshi, Suzuki, Mitsunari
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Primary Examiner(s)NGUYEN, TUYEN T
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Application NumberUS14/549,094Publication NumberTime in Patent Office747 DaysField of Search307/104, 336/65, 336/200, 336/232, 336/170, 336/173, 336214-215US Class Current1/1CPC Class CodesH01F 27/24 Magnetic coresH01F 27/30 Fastening or clamping coils...H01F 27/38 Auxiliary core members; Aux...H01F 27/42 Circuits specially adapted ...H01F 3/10 Composite arrangements of m...H01F 37/00 Fixed inductances not cover...H01F 38/00 Adaptations of transformers...H01F 38/14 Inductive couplings for wir...H02J 50/10 using inductive couplingH02J 50/70 involving the reduction of ...
