Wireless Power Transfer Using Multiple Coil Arrays
First Claim
1. A wireless power device comprising:
- a first coil configured to receive a time-varying current that flows in the first coil in a first direction; and
a second coil coupled to the first coil in such a way that the time-varying current flows in the second coil in a second direction, wherein the first direction is opposite from the second direction, and the first coil is configured to magnetically couple with the second coil.
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Accused Products
Abstract
In one embodiment of a wireless power transmitter, two coils are magnetically coupled together by placing both coils on a magnetic layer. A power circuit generates an AC signal of a defined voltage magnitude that causes a current to flow through the first coil, which generates a magnetic field having a first polarity. The second coil is coupled to the first coil. Current flows through the second coil and generates a magnetic field having a second polarity that is opposite from the first polarity. Because the magnetic field generated by each coil has a different polarity, the magnetic fields attract and form a strong magnetic field that flows from the first coil to the second coil. The strong magnetic field can transfer greater amounts of power to a receiver in comparison to coil configurations that emit magnetic fields in the same direction that repel one another.
27 Citations
34 Claims
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1. A wireless power device comprising:
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a first coil configured to receive a time-varying current that flows in the first coil in a first direction; and a second coil coupled to the first coil in such a way that the time-varying current flows in the second coil in a second direction, wherein the first direction is opposite from the second direction, and the first coil is configured to magnetically couple with the second coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless power device comprising:
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a power source configured to generate a first time-varying current; a first coil configured to receive the first time-varying current from the power source, wherein the first time-varying current flows in the first coil in a first direction; a second coil coupled to the first coil in such a way that the first time-varying current flows in the second coil in a second direction, wherein the first direction is opposite from the second direction; a third coil configured to receive a second time-varying current, wherein the time varying current flows in the third coil in a third direction and the third direction is opposite from the second direction; a fourth coil coupled to the third coil in such a way that the second time-varying current flows in the fourth coil in a fourth direction, wherein the fourth direction is opposite from the third direction and the first direction; a magnetic layer configured to magnetically couple the first coil and the second coil, and to magnetically couple the third coil and the fourth coil; and an air gap in the magnetic layer, wherein the air gap separates the first coil from the third coil and the second coil from the fourth coil. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A wireless power device comprising:
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a first coil wound in a first direction such that the first coil is configured to generate a first magnetic field having a first polarity; and a second coil coupled to the first coil, wherein the second coil is wound in a second direction and is configured to generate a second magnetic field having a second polarity, wherein the first polarity is opposite from the second polarity, and the first coil is configured to magnetically couple with the second coil. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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Specification