Multiple coils for wireless power
First Claim
1. A wireless power transfer device comprising:
- a first coil of wire comprising a first winding to receive electrical current and emit a first electromagnetic field; and
a second coil of wire comprising a second winding to receive electrical current and emit a second electromagnetic field having a weaker electromagnetic field than the first electromagnetic field, the wireless power transfer device to;
combine the first electromagnetic field and the second electromagnetic field to form a combined electromagnetic field; and
transmit power wirelessly through a first external surface of the wireless power transfer device to a receiving device with the combined electromagnetic field, wherein the combined electromagnetic field comprises a faster decay over distance through a second external surface than through the first external surface.
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Accused Products
Abstract
A wireless power transfer device and method including a first coil of wire having a first winding to receive electrical current and emit a first electromagnetic field, a second coil of wire having a second winding to receive electrical current and emit a second electromagnetic field, the second electromagnetic field weaker than the first electromagnetic field. A combined electromagnetic field of the first electromagnetic field and the second electromagnetic field to transmit power wirelessly through a first external surface of the wireless power transfer device to a receiving device, and decay faster over distance through a second external surface of the wireless power transfer device than through the first external surface.
9 Citations
25 Claims
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1. A wireless power transfer device comprising:
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a first coil of wire comprising a first winding to receive electrical current and emit a first electromagnetic field; and a second coil of wire comprising a second winding to receive electrical current and emit a second electromagnetic field having a weaker electromagnetic field than the first electromagnetic field, the wireless power transfer device to; combine the first electromagnetic field and the second electromagnetic field to form a combined electromagnetic field; and transmit power wirelessly through a first external surface of the wireless power transfer device to a receiving device with the combined electromagnetic field, wherein the combined electromagnetic field comprises a faster decay over distance through a second external surface than through the first external surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of wireless power transfer, comprising:
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emitting a first electromagnetic field via a first coil in a power transfer device; and emitting a second electromagnetic field via a second coil weaker than the first electromagnetic field; combining the first electromagnetic field and the second electromagnetic field to form a combined electromagnetic field; and transmitting power wirelessly with the combined electromagnetic field through a first external surface of the power transfer device to a receiving device, wherein the combined electromagnetic field decays faster over distance through a second external surface than through the first external surface. - View Dependent Claims (19, 20, 21, 22)
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23. A method of manufacturing a power transfer device to wirelessly transmit power to a receiving device, comprising:
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disposing a first coil in a chassis of a housing of the power transfer device, the first coil to receive electrical current and emit a first electromagnetic field; and disposing a second coil in the chassis, the second coil to receive electrical current and emit a second electromagnetic field weaker than the first electromagnetic field, wherein a combined electromagnetic field of the first electromagnetic field and the second electromagnetic field to; transmit power wirelessly through a first external surface of the power transfer device to a receiving device; and decay faster over distance through a second external surface of the power transfer device than through the first external surface. - View Dependent Claims (24, 25)
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Specification