COIL UNIT AND APPARATUS FOR DETECTING FOREIGN MATTER
First Claim
1. A coil unit, which is used for a contactless power transmission from power feeding side to power receiving side, comprising a coil for power transmission and an apparatus for detecting foreign matter,wherein, the apparatus for detecting foreign matter comprises a plurality of resonators comprising a resonance coil and a resonance capacitor, and an excitation coil for exciting the plurality of resonators,wherein, the plurality of resonators are disposed so as to cover at least an area interlinking with a magnetic flux generated by the coil for power transmission and to decrease an influence of mutual inductance.
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Accused Products
Abstract
The present invention aims to provide a coil unit for improving an accuracy in detecting foreign matter and an apparatus for detecting foreign matter which improves the accuracy in detecting foreign matter when a power is transmitted in a contactless manner. A power feeding coil unit L100 (a coil unit) of the present invention is provided with a power feeding coil L1 (a coil for power transmission) and an apparatus D100 for detecting foreign matter. The apparatus D100 for detecting foreign matter is provided with a plurality of resonators R1 having a resonator coil M1 and a resonator capacitor C1 and also an excitation coil E1 for exciting the plurality of resonators R1. The plurality of resonators R1 are disposed to cover at least an area interlinking with a magnetic flux generated by the power feeding coil L1 and to decrease an influence of mutual inductance.
15 Citations
7 Claims
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1. A coil unit, which is used for a contactless power transmission from power feeding side to power receiving side, comprising a coil for power transmission and an apparatus for detecting foreign matter,
wherein, the apparatus for detecting foreign matter comprises a plurality of resonators comprising a resonance coil and a resonance capacitor, and an excitation coil for exciting the plurality of resonators, wherein, the plurality of resonators are disposed so as to cover at least an area interlinking with a magnetic flux generated by the coil for power transmission and to decrease an influence of mutual inductance.
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2. A coil unit, which is used for a contactless power transmission from power feeding side to power receiving side, comprising a coil for power transmission and an apparatus for detecting foreign matter,
wherein, the apparatus for detecting foreign matter comprises a plurality of resonators comprising a resonance coil and a resonance capacitor, and an excitation coil for exciting the plurality of resonators, wherein, the plurality of resonators are disposed in rows and columns so as to cover at least an area interlinking with a magnetic flux generated by the coil for power transmission, wherein, the plurality of resonators adjacent with each other in a column direction or a row direction are disposed in layers so that the plurality of resonators do not overlap with each other when viewed from a direction perpendicular to a surface and the distances from the resonators to the excitation coil are different from each other.
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5. An apparatus for detecting foreign matter, which is used for detecting foreign matter, comprising a plurality of resonators comprising a resonance coil and a resonance capacitor, and an excitation coil for exciting the plurality of resonators, the plurality of resonators are disposed in rows and columns in an in-plane direction,
wherein, the plurality of resonators adjacent with each other in a column direction or a row direction are disposed in layers so that the plurality of resonators do not overlap with each other when viewed from a direction perpendicular to a surface and the distances from the resonators to the excitation coil are different from each other.
Specification