Wireless energy transfer
First Claim
Patent Images
1. A wireless power system comprising:
- a source resonator and a power supply coupled to the source resonator to provide power to the source resonator, the source resonator having a resonant frequency ω
1, an intrinsic loss rate Γ
1, and an intrinsic quality factor Q1=ω
1/(2Γ
1); and
a device resonator and a load coupled to the device resonator to receive power from the device resonator, the device resonator having a resonant frequency ω
2, an intrinsic loss rate Γ
2, and an intrinsic quality factor Q2=ω
2/(2Γ
2),wherein the source resonator and the device resonator are configured to resonantly and wirelessly couple electromagnetic power from the source resonator to the device resonator over a range of distances D between the source resonator and the device resonator using non-radiative electromagnetic induction having a coupling coefficient κ
, and wherein the intrinsic loss rates satisfy κ
/√
{square root over (Γ
1Γ
2)}>
2 over the range of distances D between the source resonator and the device resonator,wherein Q1>
100 and Q2>
100, andfurther comprising a current probe configured to measure a current in at least one of the resonators.
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Abstract
Disclosed is an apparatus for use in wireless energy transfer, which includes a first resonator structure configured to transfer energy non-radiatively with a second resonator structure over a distance greater than a characteristic size of the second resonator structure. The non-radiative energy transfer is mediated by a coupling of a resonant field evanescent tail of the first resonator structure and a resonant field evanescent tail of the second resonator structure.
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Citations
34 Claims
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1. A wireless power system comprising:
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a source resonator and a power supply coupled to the source resonator to provide power to the source resonator, the source resonator having a resonant frequency ω
1, an intrinsic loss rate Γ
1, and an intrinsic quality factor Q1=ω
1/(2Γ
1); anda device resonator and a load coupled to the device resonator to receive power from the device resonator, the device resonator having a resonant frequency ω
2, an intrinsic loss rate Γ
2, and an intrinsic quality factor Q2=ω
2/(2Γ
2),wherein the source resonator and the device resonator are configured to resonantly and wirelessly couple electromagnetic power from the source resonator to the device resonator over a range of distances D between the source resonator and the device resonator using non-radiative electromagnetic induction having a coupling coefficient κ
, and wherein the intrinsic loss rates satisfy κ
/√
{square root over (Γ
1Γ
2)}>
2 over the range of distances D between the source resonator and the device resonator,wherein Q1>
100 and Q2>
100, andfurther comprising a current probe configured to measure a current in at least one of the resonators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for providing wireless power to a load, the method comprising:
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providing a source resonator and a power supply coupled to the source resonator to provide power to the source resonator, the source resonator having a resonant frequency an intrinsic loss rate Γ
1, and an intrinsic quality factor Q1=ω
1/(2Γ
1); andproviding a device resonator coupled to the load to provide power to the load, the device resonator having a resonant frequency ω
2, an intrinsic loss rate Γ
2, and an intrinsic quality factor Q2=ω
2 (2Γ
2),resonantly and wirelessly coupling electromagnetic power from the source resonator to the device resonator using non-radiative electromagnetic induction having a coupling coefficient κ
, and wherein the intrinsic loss rates satisfy κ
/√
{square root over (Γ
1Γ
2)}>
2 over a range of distances D between the source resonator and the device resonator,wherein Q1>
100 and Q2>
100, andfurther comprising measuring a current in at least one of the resonators. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification