Controlling current flow path in wireless electric vehicle charging systems for mitigating RF radiated emissions
First Claim
1. A power transfer device of a wireless electric vehicle charging (WEVC) system, the power transfer device comprising:
- a ferrite material and at least one electrically conductive coil, the ferrite material and the at least one electrically conductive coil configured to wirelessly transfer energy from an electromagnetic field comprising first electromagnetic radiation emissions; and
at least one shield structure positioned on a side of the ferrite material opposite the at least one electrically conductive coil and comprising a plurality of electrically conducting regions and one or more electrically insulating regions,wherein the electromagnetic field induces currents in the at least one shield structure, the currents generating second electromagnetic radiation emissions,wherein the one or more electrically insulating regions are located between two or more of the plurality of electrically conducting regions, andwherein the plurality of electrically conducting regions and the one or more electrically insulating regions are arranged in a pattern that generates the second electromagnetic radiation emissions with an opposite phase from the first electromagnetic radiation emissions and substantially cancels at least a portion of the first electromagnetic radiation emissions that do not contribute to the energy transfer via the first electromagnetic field and the at least one electrically conductive coil.
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Accused Products
Abstract
This disclosure provides systems, methods and apparatus for mitigating electromagnetic radiation emissions. In one aspect, a power transfer device of a wireless electric vehicle charging (WEVC) system is provided. The power transfer device includes a ferrite material and at least one electrically conductive coil. The ferrite material and the at least one coil are configured to wirelessly transfer energy either from or to a second power transfer device of the WEVC system. The power transfer device further includes at least one shield comprising a plurality of electrically conducting regions and one or more electrically insulating regions. The plurality of electrically conducting regions and one or more electrically insulating regions are configured to mitigate electromagnetic radiation emissions from the WEVC system that do not contribute to the wireless power transfer between the at least one electrically conductive coil and the second power transfer device.
17 Citations
22 Claims
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1. A power transfer device of a wireless electric vehicle charging (WEVC) system, the power transfer device comprising:
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a ferrite material and at least one electrically conductive coil, the ferrite material and the at least one electrically conductive coil configured to wirelessly transfer energy from an electromagnetic field comprising first electromagnetic radiation emissions; and at least one shield structure positioned on a side of the ferrite material opposite the at least one electrically conductive coil and comprising a plurality of electrically conducting regions and one or more electrically insulating regions, wherein the electromagnetic field induces currents in the at least one shield structure, the currents generating second electromagnetic radiation emissions, wherein the one or more electrically insulating regions are located between two or more of the plurality of electrically conducting regions, and wherein the plurality of electrically conducting regions and the one or more electrically insulating regions are arranged in a pattern that generates the second electromagnetic radiation emissions with an opposite phase from the first electromagnetic radiation emissions and substantially cancels at least a portion of the first electromagnetic radiation emissions that do not contribute to the energy transfer via the first electromagnetic field and the at least one electrically conductive coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power transfer device of a wireless electric vehicle charging (WEVC) system, the power transfer device comprising:
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means for wirelessly transferring energy from an electromagnetic field comprising first electromagnetic radiation emissions; means for enhancing coupling with the electromagnetic field; and means for mitigating electromagnetic radiation emissions that do not contribute to said wirelessly transferring energy, the mitigating means comprising a plurality of electrically conducting regions and one or more electrically insulating regions and positioned on a side of the coupling enhancing means opposite the wirelessly transferring energy means, wherein the electromagnetic field induces currents in the means for mitigating electromagnetic radiation emissions that do not contribute to said wirelessly transferring energy radiation, the currents generating second electromagnetic radiation emissions, wherein the one or more electrically insulating regions are located between two or more of the electrically conducting regions, and wherein the plurality of electrically conducting regions and one or more electrically insulating regions are arranged in a pattern that generates the second electromagnetic radiation emissions with an opposite phase from the first electromagnetic radiation emissions and substantially cancels at least a portion of the first electromagnetic radiation emissions that do not contribute to the energy transfer via the first electromagnetic field and the at least one electrically conductive coil. - View Dependent Claims (13, 14)
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15. A method of mitigating electromagnetic radiation emissions from a wireless electric vehicle charging (WEVC) system, the method comprising:
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providing wireless power to a power transfer device comprising a ferrite material and at least one electrically conductive coil, the ferrite material and the at least one coil configured to wirelessly transfer energy from an electromagnetic field, the electromagnetic field comprising first electromagnetic radiation emissions, the power transfer device further comprising at least one shield structure positioned on a side of the ferrite material opposite the at least one electrically conductive coil, wherein the at least one shield structure comprises a plurality of electrically conducting regions and one or more electrically insulating regions, wherein the electromagnetic field induces currents in the at least one shield structure, the currents generating second electromagnetic radiation emissions, wherein the one or more electrically insulating regions are located between two or more of the electrically conducting regions, and wherein the plurality of electrically conducting regions and or more electrically insulating regions are arranged in a pattern that generates the second electromagnetic radiation emissions with an opposite phase from the first electromagnetic radiation emissions and substantially cancels at least a portion of the first electromagnetic radiation emissions that do not contribute to wireless energy transfer via the electromagnetic field and the at least one electrically conductive coil. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of mitigating electromagnetic radiation emissions from a wireless electric vehicle charging (WEVC) system, the method comprising:
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wirelessly transferring energy, via a first power transfer device comprising a ferrite material, at least one electrically conductive coil, and at least one shield structure, the at least one shield structure positioned on a side of the ferrite material opposite the at least one electrically conductive coil and comprising a plurality of electrically conducting regions and one or more electrically insulating regions, wherein the one or more electrically insulating regions are located between two or more of the electrically conducting regions, and the energy wirelessly transferring from an electromagnetic field, the electromagnetic field comprising first electromagnetic radiation emissions and the electromagnetic field inducing currents in the at least one shield structure, the currents generating second electromagnetic radiation emissions; wherein the plurality of electrically conducting regions and the one or more electrically insulating regions are arranged in a pattern that generates the second electromagnetic radiation emissions with an opposite phase from the first electromagnetic radiation emissions and substantially cancels at least a portion of the first electromagnetic radiation emissions that do not contribute to wireless energy transfer via the electromagnetic field and the first power transfer device. - View Dependent Claims (22)
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Specification