Low inductance pad winding using a matched winding of multiple spirals
First Claim
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1. An apparatus comprising:
- a first charging coil comprising a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings;
a second charging coil comprising a second conductor wound with respect to the first charging coil where each coil of the second charging coil is arranged between each winding of the first charging coil, wherein the first charging coil and second charging coil are connected in parallel; and
a ferrite structure positioned adjacent to the first charging coil and the second charging coil,wherein the first charging coil and the second charging coil are wound in a same direction, andwherein each charging coil comprises an inner starting point located closer to the center point than each successive winding of the charging coil, and wherein the inner starting point for each charging coil is a same radius from the center point and the inner starting point of the first charging coil is separated from the inner starting point of the second charging coil in a direction radially around the center point.
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Abstract
An apparatus for wireless power charging includes a first charging coil with a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings. A second charging coil includes a second conductor wound with respect to the first charging coil where each coil of the second charging coil is arranged between each winding of the first charging coil. The first charging coil and second charging coil are connected in parallel. A ferrite structure is positioned adjacent to the first charging coil and the second charging coil.
11 Citations
20 Claims
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1. An apparatus comprising:
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a first charging coil comprising a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings; a second charging coil comprising a second conductor wound with respect to the first charging coil where each coil of the second charging coil is arranged between each winding of the first charging coil, wherein the first charging coil and second charging coil are connected in parallel; and a ferrite structure positioned adjacent to the first charging coil and the second charging coil, wherein the first charging coil and the second charging coil are wound in a same direction, and wherein each charging coil comprises an inner starting point located closer to the center point than each successive winding of the charging coil, and wherein the inner starting point for each charging coil is a same radius from the center point and the inner starting point of the first charging coil is separated from the inner starting point of the second charging coil in a direction radially around the center point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20)
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17. An apparatus comprising:
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a first charging coil comprising a conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings; one or more additional charging coils, each charging coil comprising a conductor wound with respect to the first charging coil where each coil of an additional charging coil is arranged between each winding of the first charging coil, wherein the first charging coil and additional charging coils are connected in parallel, wherein the first charging coil and the second charging coil are wound in a same direction, and wherein each charging coil comprises an inner starting point located closer to the center point than each successive winding of the charging coil, wherein the inner starting point for each charging coil is positioned a same radius from the center point, wherein the inner starting point for each charging coil is spaced around a starting point circle equidistant from the inner starting point for other charging coils, the starting point circle centered about the center point, wherein the first charging coil and the one or more additional charging coils are connected in parallel, wherein the first charging coil and the one or more additional charging coils are substantially planar; and a ferrite structure positioned adjacent to the first charging coil and the one or more additional charging coils, at least one side of the ferrite structure is planar and is positioned adjacent to the first charging coil and the one or more additional charging coils.
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18. A system comprising:
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a first charging coil comprising a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings; one or more additional charging coils, each charging coil comprising a conductor wound with respect to the first charging coil where each coil of an additional charging coil is arranged between each winding of the first charging coil, wherein the first charging coil and additional charging coils are connected in parallel; wherein the first charging coil and the second charging coil are wound in a same direction, and wherein each charging coil comprises an inner starting point located closer to the center point than each successive winding of the charging coil, and wherein the inner starting point for each charging coil is a same radius from the center point and the inner starting point of the first charging coil is separated from the inner starting point of the second charging coil in a direction radially around the center point; a ferrite structure positioned adjacent to the first charging coil and the one or more additional charging coils, the charging coils and ferrite structure comprising a charging pad; and
one ofa resonant converter connected to the charging pad and providing power to the charging pad; and a secondary circuit that receives power from the charging pad and conditions the power for a load. - View Dependent Claims (19)
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Specification