Localized charging, load identification and bi-directional communication methods for a planar inductive battery charging system
First Claim
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1. A planar battery charging system, comprising:
- a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and
a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when placed on said charging surface, said secondary winding being provided with electromagnetic shielding on the side of said winding opposite from the side to be placed on the charging surface;
wherein the relative dimensions of the primary windings and the secondary winding are chosen to meet the conditions that (a) the area enclosed by the secondary winding is greater than the area enclosed by a primary winding, (b) the secondary winding or said shielding will always fully enclose a primary winding when a secondary winding is placed on said charging surface, and (c) a single primary winding generates sufficient power to charge a said battery.
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Abstract
Methods and principles are described for systematizing localized charging, load identification and bi-directional communication in a planar battery charging system. Also described is control circuitry for selectively energizing a primary winding when a load is placed on the platform. The optimization of the size of the receiver winding compared to the transmitter winding is discussed, while the associated communication methods include techniques for load identification, compatibility checks, hand-shaking and communication of charging status.
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Citations
25 Claims
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1. A planar battery charging system, comprising:
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a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when placed on said charging surface, said secondary winding being provided with electromagnetic shielding on the side of said winding opposite from the side to be placed on the charging surface; wherein the relative dimensions of the primary windings and the secondary winding are chosen to meet the conditions that (a) the area enclosed by the secondary winding is greater than the area enclosed by a primary winding, (b) the secondary winding or said shielding will always fully enclose a primary winding when a secondary winding is placed on said charging surface, and (c) a single primary winding generates sufficient power to charge a said battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A planar battery charging system, comprising:
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a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when placed on said charging surface, wherein when a said secondary winding is placed on said charging surface only a single primary winding is excited to generate magnetic flux to charge said battery. - View Dependent Claims (11, 12, 13)
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14. A planar battery charging system, comprising:
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a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when placed on said charging surface; and a matrix switching array for selectively exciting individual primary windings. - View Dependent Claims (15, 16, 17)
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18. A planar battery charging system, comprising:
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a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when placed on said charging surface; and data communication means for enabling data communication between the primary side and the secondary side. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification