System and method for reducing leakage flux in wireless electric vehicle charging systems
First Claim
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1. An apparatus for collecting leakage magnetic flux of a wireless field in a wireless power transfer system, comprising:
- a wireless power receiver configured to couple to a wireless field generated by a wireless power transmitter, wherein a portion of the wireless field comprises the leakage magnetic flux; and
a leakage collector comprising a ferromagnetic material having a predetermined geometry and composition and configured to absorb or redirect at least a portion of the leakage magnetic flux away from an outer edge of an electric vehicle, wherein the leakage collector is positioned at a first distance from the wireless power receiver within the wireless field and wherein a width of the leakage collector varies from a first width to a second width, and wherein the first width is narrower than the second width.
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Abstract
A method and apparatus for reducing leakage magnetic flux in wireless vehicle charging systems are disclosed. A wireless power receiver may be configured to couple to a wireless field generated by a wireless power transmitter. A portion of the wireless field may comprise the leakage magnetic flux. A leakage collector comprising a ferromagnetic material may be positioned at a distance from the wireless power receiver within the wireless field and may be configured to absorb or redirect at least a portion of the leakage magnetic flux away from an outer edge of an electric vehicle.
39 Citations
39 Claims
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1. An apparatus for collecting leakage magnetic flux of a wireless field in a wireless power transfer system, comprising:
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a wireless power receiver configured to couple to a wireless field generated by a wireless power transmitter, wherein a portion of the wireless field comprises the leakage magnetic flux; and a leakage collector comprising a ferromagnetic material having a predetermined geometry and composition and configured to absorb or redirect at least a portion of the leakage magnetic flux away from an outer edge of an electric vehicle, wherein the leakage collector is positioned at a first distance from the wireless power receiver within the wireless field and wherein a width of the leakage collector varies from a first width to a second width, and wherein the first width is narrower than the second width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 31, 32, 33)
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12. A method for collecting leakage magnetic flux of a wireless field in a wireless power transfer system, comprising:
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coupling, via a wireless power receiver, to the wireless field generated by a wireless power transmitter, wherein a portion of the wireless field comprises the leakage magnetic flux; and absorbing or redirecting at least a portion of the leakage magnetic flux away from an outer edge of an electric vehicle via a leakage collector, the leakage collector comprising a ferromagnetic material having a predetermined geometry and composition and positioned at a first distance from a wireless power receiver within the wireless field, wherein a width of the leakage collector varies from a first width to a second width, and wherein the first width is narrower than the second width. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 34, 35, 36)
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22. An apparatus for collecting leakage magnetic flux of a wireless field in a wireless power transfer system, comprising:
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means for coupling to a wireless field generated by a wireless power transmitter, wherein a portion of the wireless field comprises the leakage magnetic flux; and means for absorbing or redirecting at least a portion of the leakage magnetic flux away from an outer edge of an electric vehicle, the pair of absorbing means having a predetermined geometry and composition, wherein a width of the absorbing means varies from a first width to a second width, and wherein the first width is narrower than the second width. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 37, 38, 39)
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Specification