Contactless power transmission device, and power feeder and power receiver for use in the same
First Claim
1. A contactless power transmission device for transmitting power between a power feeder and a power receiver via electromagnetic induction, whereinthe power feeder includes:
- a housing base member,a primary coil provided on the housing base member and configured to generate magnetic flux,a cover attached to the housing base member and configured to cover the primary coil,a capacitance sensor including a detection electrode between the primary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode,a high-dielectric member embedded in the cover and having a permittivity higher than that of a material for the cover, andwherein the cover has an upper portion configured to cover an upper portion of the primary coil and a side portion configured to cover a side portion of the primary coil,the detection electrode is provided between the upper portion of the cover and the primary coil and between the side portion of the cover and the primary coil, andthe high-dielectric member is embedded in the upper and side portions of the cover.
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Accused Products
Abstract
A power feeder of a contactless power transmission device includes a housing base member, a primary coil provided on the housing base member and configured to generate magnetic flux, a cover attached to the housing base member and configured to cover the primary coil, a capacitance sensor including a detection electrode between the primary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode, and a high-dielectric member embedded in the cover and having a permittivity higher than that of a material for the cover.
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Citations
11 Claims
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1. A contactless power transmission device for transmitting power between a power feeder and a power receiver via electromagnetic induction, wherein
the power feeder includes: -
a housing base member, a primary coil provided on the housing base member and configured to generate magnetic flux, a cover attached to the housing base member and configured to cover the primary coil, a capacitance sensor including a detection electrode between the primary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode, a high-dielectric member embedded in the cover and having a permittivity higher than that of a material for the cover, and wherein the cover has an upper portion configured to cover an upper portion of the primary coil and a side portion configured to cover a side portion of the primary coil, the detection electrode is provided between the upper portion of the cover and the primary coil and between the side portion of the cover and the primary coil, and the high-dielectric member is embedded in the upper and side portions of the cover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A contactless power transmission device for transmitting power between a power feeder and a power receiver via electromagnetic induction, wherein
the power receiver includes: -
a housing base member, a secondary coil provided on the housing base member and configured to generate electromotive force depending on magnetic flux received from the power feeder, a cover attached to the housing base member and configured to cover the secondary coil, a capacitance sensor including a detection electrode between the secondary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode, and a high-dielectric member embedded in the cover and having a permittivity higher than that of the cover, and wherein the cover has an upper portion configured to cover an upper portion of the primary coil and a side portion configured to cover a side portion of the primary coil, the detection electrode is provided between the upper portion of the cover and the primary coil and between the side portion of the cover and the primary coil, and the high-dielectric member is embedded in the upper and side portions of the cover.
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10. A power feeder for feeding power to a power receiver of a contactless power transmission device via electromagnetic induction when the power feeder and the power receiver are positioned to face each other, the power feeder comprising:
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a housing base member; a primary coil provided on the housing base member and configured to generate magnetic flux; a cover attached to the housing base member and configured to cover the primary coil; a capacitance sensor including a detection electrode between the primary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode; and a high-dielectric member embedded in the cover and having a permittivity higher than that of a material for the cover, wherein the cover has an upper portion configured to cover an upper portion of the primary coil and a side portion configured to cover a side portion of the primary coil, the detection electrode is provided between the upper portion of the cover and the primary coil and between the side portion of the cover and the primary coil, and the high-dielectric member is embedded in the upper and side portions of the cover.
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11. A power receiver for receiving power from a power feeder of a contactless power transmission device, the power receiver comprising:
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a housing base member; a secondary coil provided on the housing base member and configured to generate electromotive force depending on magnetic flux received from the power feeder; a cover attached to the housing base member and configured to cover the secondary coil; a capacitance sensor including a detection electrode between the secondary coil and the cover, and configured to detect foreign matter around the cover based on a change in capacitance detected using the detection electrode; and a high-dielectric member embedded in the cover and having a permittivity higher than that of the cover, wherein the cover has an upper portion configured to cover an upper portion of the primary coil and a side portion configured to cover a side portion of the primary coil, the detection electrode is provided between the upper portion of the cover and the primary coil and between the side portion of the cover and the primary coil, and the high-dielectric member is embedded in the upper and side portions of the cover.
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Specification