Counter wound inductive power supply
First Claim
1. A contactless power supply for providing power to at least one remote device, comprising:
- a primary coil array including more than two inductive primaries;
a driving circuit adapted to selectively drive a first inductive primary of the primary coil array and a second inductive primary of the primary coil array,wherein the first inductive primary provides an electromagnetic flux when driven with a first time-varying current, the first inductive primary defining a first centerline axis;
wherein the second inductive primary provides an electromagnetic flux when driven with a second time-varying current, the second inductive primary defining a second centerline axis coaxial with the first centerline axis; and
a power transfer surface to receive the at least one remote device thereon, wherein the first and second inductive primaries are subjacent the power transfer surface and wherein the first and second centerline axes are generally parallel to the power transfer surface, the first and second inductive primaries being operable to define a cumulative magnetic flux in a region of the power transfer surface between the first and second inductive primaries.
4 Assignments
0 Petitions
Accused Products
Abstract
A contactless power supply is provided. The contactless power supply includes two or more primary coils for generating a region of cooperative magnetic flux generally therebetween. A portable device having a secondary coil can be positioned proximate this region of magnetic flux to receive wireless power from the contactless power supply. The spaced-apart primary coils can be wound in alternating directions about a common axis and driven in phase, or can be wound in a single direction about a common axis and driven approximately 180 degrees out of phase. The contactless power supply can include a plurality of primary coils in an adjustable array to accommodate multiple portable devices each with different secondary configurations and power consumption needs.
23 Citations
37 Claims
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1. A contactless power supply for providing power to at least one remote device, comprising:
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a primary coil array including more than two inductive primaries; a driving circuit adapted to selectively drive a first inductive primary of the primary coil array and a second inductive primary of the primary coil array, wherein the first inductive primary provides an electromagnetic flux when driven with a first time-varying current, the first inductive primary defining a first centerline axis; wherein the second inductive primary provides an electromagnetic flux when driven with a second time-varying current, the second inductive primary defining a second centerline axis coaxial with the first centerline axis; and a power transfer surface to receive the at least one remote device thereon, wherein the first and second inductive primaries are subjacent the power transfer surface and wherein the first and second centerline axes are generally parallel to the power transfer surface, the first and second inductive primaries being operable to define a cumulative magnetic flux in a region of the power transfer surface between the first and second inductive primaries. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for providing wireless power to a remote device, comprising:
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providing a contactless power supply including; a power transfer surface to receive the remote device thereon, and a primary coil array subjacent the power transfer surface and including more than two horizontally disposed inductive primaries; and driving first and second inductive primaries of the primary coil array with respective time-varying currents to provide the remote device with a first cumulative magnetic flux in a region between the first and second inductive primaries of the primary coil array, wherein the first inductive primary provides an electromagnetic flux when driven with a first time-varying current, the first inductive primary defining a first centerline axis; wherein the second inductive primary provides an electromagnetic flux when driven with a second time-varying current, the second inductive primary defining a second centerline axis coaxial with the first centerline axis. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A contactless power supply system comprising:
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a remote device including an inductive secondary; and a contactless power supply including; a power transfer surface to receive the remote device thereon, a primary coil array including more than two inductive primaries subjacent the power transfer surface and defining a centerline axis generally parallel to the power transfer surface, and a driving circuit adapted to selectively drive a first inductive primary of the primary coil array and a second inductive primary of the primary coil array, wherein the inductive secondary is orthogonal to the first and second inductive primaries, and wherein the first and second inductive primaries are operable to generate a cumulative magnetic flux in the region of the power transfer surface occupied by the orthogonal inductive secondary. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method for providing wireless power to a remote device including an inductive secondary, the method comprising:
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providing a power transfer surface to receive the remote device thereon; providing a first primary coil array subjacent the power transfer surface and including more than two spaced-apart inductive primaries wound about a first centerline axis, the first centerline axis being generally parallel to the power transfer surface; driving a first inductive primary of the first primary coil array with a current in a first direction; and driving a second inductive primary of the first primary coil array with a current in a second direction, wherein the inductive secondary is generally orthogonal to the first and second inductive primaries of the first primary coil array, and wherein the first and second inductive primaries of the first primary coil array are generally tangentially aligned with the inductive secondary to provide a cumulative magnetic flux to the inductive secondary. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification