MULTIFILAMENT TRANSMITTER COUPLER WITH CURRENT SHARING
First Claim
1. A wireless power transmitter for generating a magnetic field, the wireless power transmitter comprising:
- a first coupler loop, coupled between a first electrical connection and a second electrical connection, the first electrical connection and the second electrical connection capable of receiving a driving signal and configured to allow the driving signal applied across the first electrical connection and the second electrical connection to cause a first current to flow in the first coupler loop and generate a first magnetic field component; and
a second coupler loop, coupled between the first electrical connection and the second electrical connection, the first electrical connection and the second electrical connection further configured to allow the driving signal applied across the first electrical connection and the second electrical connection to cause a second current to flow in the second coupler loop and generate a second magnetic field component, wherein the first current is different from the second current.
1 Assignment
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Accused Products
Abstract
A wireless power transmitter that provides wireless power via a magnetic field includes electrical connections for a driving signal and a plurality of coupler loops that divide the current generated by the driving signal. The transmitter can be tuned to provide a distributed magnetic field that is more evenly distributed over the transmitter pad. The currents through different coupler loops can be controlled by the relative impedances of the coupler loops. The coupler loops can take on various shapes, such as substantially concentric circular paths and they may overlap. Impedances can be designed using one or more capacitances. Capacitance between coupler loops can be provided. Feed capacitors might be provided at the electrical connections.
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Citations
30 Claims
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1. A wireless power transmitter for generating a magnetic field, the wireless power transmitter comprising:
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a first coupler loop, coupled between a first electrical connection and a second electrical connection, the first electrical connection and the second electrical connection capable of receiving a driving signal and configured to allow the driving signal applied across the first electrical connection and the second electrical connection to cause a first current to flow in the first coupler loop and generate a first magnetic field component; and a second coupler loop, coupled between the first electrical connection and the second electrical connection, the first electrical connection and the second electrical connection further configured to allow the driving signal applied across the first electrical connection and the second electrical connection to cause a second current to flow in the second coupler loop and generate a second magnetic field component, wherein the first current is different from the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wireless power transmitter, comprising:
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circuitry configured to generate a driving signal; a pair of electrical connections comprising a first electrical connection and a second electrical connection; a transmitter pad coupled to the pair of electrical connections to receive the driving signal; a first coupler loop along a first path enclosed within the transmitter pad, coupled between the first electrical connection and the second electrical connection; a second coupler loop along a second path enclosed within the transmitter pad, coupled between the first electrical connection and the second electrical connection, the second coupler loop being electrically in parallel with the first coupler loop and separated from the first coupler loop along a loop longitude sufficient to generate distinguishable magnetic field components among the first coupler loop and the second coupler loop; and tuning elements that tune a resonance of the first coupler loop and the second coupler loop independently of each other. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of providing power wirelessly to devices having wireless power receivers and positioned to wirelessly receive power via a magnetic field, the method comprising:
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receiving a driving signal across a pair of electrical connections comprising a first electrical connection and a second electrical connection; apportioning current of the driving signal to a first coupler loop and a second coupler loop, the first coupler loop being along a first path connecting the first electrical connection and the second electrical connection and the second coupler loop being along a second path connecting the first electrical connection and the second electrical connection; generating a first magnetic field component when a first current flows in the first coupler loop; and generating a second magnetic field component when a second current flows in the second coupler loop, wherein the second path is sufficiently distinct from the first path that the first magnetic field component and the second magnetic field component are distinguishable to a wireless power receiver, wherein the first current is different than the second current. - View Dependent Claims (25, 26, 27)
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28. A wireless power transmitter, comprising:
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means for generating a driving signal; means for conveying a driving signal current; first means for emitting a first magnetic field; second means for emitting a second magnetic field; means for supporting the first means for emitting along a first path and the second means for emitting along a second path separated from the first path sufficient to generate distinguishable magnetic field components as between the first means for emitting and the second means for emitting; means for partitioning the driving signal current between the first means for emitting and the second means for emitting; and means for tuning a resonance of the first means for emitting and the second means for emitting independently of each other. - View Dependent Claims (29, 30)
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Specification