Controlling field distribution of a wireless power transmitter
First Claim
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1. A transmitter for wireless power transfer to a receiver, comprising:
- a transmit antenna configured to generate a first field for wirelessly transferring power, the first field at a power level sufficient to charge the receiver; and
at least one parasitic antenna configured to modify a distribution of the first field, the at least one parasitic antenna comprising a loop configured to be selectively open-circuited when the receiver is positioned substantially within the loop or be selectively closed-circuited when the receiver is positioned substantially outside the loop, the at least one parasitic antenna configured to generate a second field that opposes the first field based on an induced current in the at least one parasitic antenna when the loop of the at least one parasitic antenna is closed-circuited.
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Abstract
Exemplary embodiments are directed to control of field distribution of a wireless power transmitter. A transmitter may include a transmit antenna configured to generate a field. The transmitter may further include least one parasitic antenna proximate the transmit antenna and configured to modify a distribution of the generated field.
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Citations
20 Claims
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1. A transmitter for wireless power transfer to a receiver, comprising:
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a transmit antenna configured to generate a first field for wirelessly transferring power, the first field at a power level sufficient to charge the receiver; and at least one parasitic antenna configured to modify a distribution of the first field, the at least one parasitic antenna comprising a loop configured to be selectively open-circuited when the receiver is positioned substantially within the loop or be selectively closed-circuited when the receiver is positioned substantially outside the loop, the at least one parasitic antenna configured to generate a second field that opposes the first field based on an induced current in the at least one parasitic antenna when the loop of the at least one parasitic antenna is closed-circuited. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for wireless power transfer to a receiver, comprising:
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generating a first field for wirelessly transferring power with a wireless transmit antenna of a transmitter, the first field at a power level sufficient to charge the receiver; open-circuiting a parasitic antenna when the receiver is within an associated loop, where the parasitic antenna is configured to modify a distribution of the first field; and short-circuiting the parasitic antenna if the receiver is not within the associated loop, the parasitic antenna configured to generate a second field that opposes the first field based on an induced current in the parasitic antenna when the associated loop is short-circuited. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A device for wireless power transfer to a receiver, comprising:
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means for generating a first field for wirelessly transferring power, the first field at a power level sufficient to charge the receiver; and means for modifying a distribution of the first field configured to be selectively open-circuited when the receiver is positioned substantially within the means for modifying or be selectively closed-circuited when the receiver is positioned substantially outside the means for modifying, wherein the means for modifying generates a second field that opposes the first field based on an induced current in the means for modifying when the means for modifying is closed-circuited. - View Dependent Claims (19, 20)
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Specification