Coil unit, power transmission device, external power feeding apparatus, and vehicle charging system
First Claim
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1. A coil unit comprising:
- a resonant coil establishing an electromagnetic field resonant coupling with an externally provided external resonant coil,said resonant coil including an outer side coil extending along a circumference of a first winding center and centered at about said first winding center, and an extension extending from said outer side coil into a region surrounded by said outer side coil,said resonant coil, which is formed such that an anti-node of the resonant coil that is an area of an anti-node of AC current flowing through said resonant coil, is located at said extension when the electromagnetic field resonant coupling is established between said external resonant coil and said resonant coil.
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Abstract
A coil unit includes a resonant coil establishing electromagnetic field resonant coupling with an external resonant coil provided external to a vehicle. The resonant coil includes an outer side coil extending along a circumference of a first winding center, centered about the first winding center, and an extension extending from the outer side coil into a region surrounded by the outer side coil. The resonant coil is formed such that an anti-node of the resonant coil that is an area of an anti-node of AC current flowing through the resonant coil, is located at the extension when electromagnetic field resonant coupling is established between the external resonant coil and the resonant coil.
48 Citations
11 Claims
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1. A coil unit comprising:
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a resonant coil establishing an electromagnetic field resonant coupling with an externally provided external resonant coil, said resonant coil including an outer side coil extending along a circumference of a first winding center and centered at about said first winding center, and an extension extending from said outer side coil into a region surrounded by said outer side coil, said resonant coil, which is formed such that an anti-node of the resonant coil that is an area of an anti-node of AC current flowing through said resonant coil, is located at said extension when the electromagnetic field resonant coupling is established between said external resonant coil and said resonant coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle power charging system comprising:
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a vehicle including a coil unit, the coil unit including a resonant coil establishing an electromagnetic field resonant coupling with an external resonant coil provided externally to said vehicle, said resonant coil including an outer side coil extending along a circumference of a first winding center and centered at about said first winding center, and an extension extending from said outer side coil into a region surrounded by said outer side coil, said resonant coil, which is formed such that an anti-node of the resonant coil that is an area of an anti-node of AC current flowing through said resonant coil, is located at said extension when the electromagnetic field resonant coupling is established between said external resonant coil and said resonant coil, wherein a distance between the anti-node of said resonant coil and a center of said vehicle is smaller than a distance between said first winding center and the center of said vehicle, and an external power feeding apparatus including the coil unit.
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Specification