Magnetic inductive charging with low far fields
First Claim
1. A charging station apparatus for wirelessly transmitting electrical power to mobile electronic devices (MEDs), comprising:
- a planar charging surface;
a first prescribed even number of series-interconnected bank A source coils;
a second prescribed even number of series-interconnected bank B source coils; and
source electronics for energizing the bank A and bank B source coils, wherein,whenever energized, each source coil generates an alternating electromagnetic flux field in a direction perpendicular to the charging surface,the bank A source coils and bank B source coils are alternately energized in a repeating duty cycle, andthe bank A source coils and bank B source coils are interleaved so that the MEDs can have any two-dimensional orientation with respect to the charging surface.
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Accused Products
Abstract
A charging station wirelessly transmits power to mobile electronic devices (MEDs) each having a planar-shaped receiver coil (RC) and a capacitor connected in parallel across the RC. The station includes a planar charging surface, a number of series-interconnected bank A source coils (SCs), a number of series-interconnected bank B SCs, and electronics for energizing the SCs. Each SC generates a flux field perpendicular to the charging surface. The bank A and bank B SCs are interleaved and alternately energized in a repeating duty cycle. The coils in each bank are also alternately wound in a different direction so that the fields cancel each other out in a far-field environment. Whenever an MED is placed in close proximity to the charging surface, the fields wirelessly induce power in the RC. The MEDs can have any two-dimensional orientation with respect to the charging surface.
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Citations
14 Claims
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1. A charging station apparatus for wirelessly transmitting electrical power to mobile electronic devices (MEDs), comprising:
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a planar charging surface; a first prescribed even number of series-interconnected bank A source coils; a second prescribed even number of series-interconnected bank B source coils; and source electronics for energizing the bank A and bank B source coils, wherein, whenever energized, each source coil generates an alternating electromagnetic flux field in a direction perpendicular to the charging surface, the bank A source coils and bank B source coils are alternately energized in a repeating duty cycle, and the bank A source coils and bank B source coils are interleaved so that the MEDs can have any two-dimensional orientation with respect to the charging surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification