WIRELESS ENERGY TRANSFER
First Claim
Patent Images
1. A wireless power system comprising:
- a source module 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), the source resonator comprising at least one loop of conductive material; and
a device module comprising a device resonator and a load coupled to the device resonator to receive power from the device resonator and 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), the device resonator comprising at least one loop of conductive material,wherein the device module is configured to be movable relative to the source module over a range of distances D between the source module and the device module,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 using non-radiative electromagnetic induction having a coupling coefficient κ
, and wherein the intrinsic loss rates satisfy κ
/√
{square root over (Γ
1Γ
2)}>
1 over the range of distances D, andwherein the power provided to the load from the device resonator defines a work drainage rate Γ
w, and wherein the work drainage rate Γ
is configured to be set such that Γ
w=Γ
2√
{square root over (1′
+wp·
(κ
2/Γ
1·
Γ
2))} for some value of the coupling coefficient κ
in the range of distances D, wherein wp is a parameter satisfying wp>
1.
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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.
7 Citations
26 Claims
-
1. A wireless power system comprising:
-
a source module 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), the source resonator comprising at least one loop of conductive material; anda device module comprising a device resonator and a load coupled to the device resonator to receive power from the device resonator and 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), the device resonator comprising at least one loop of conductive material,wherein the device module is configured to be movable relative to the source module over a range of distances D between the source module and the device module, 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 using non-radiative electromagnetic induction having a coupling coefficient κ
, and wherein the intrinsic loss rates satisfy κ
/√
{square root over (Γ
1Γ
2)}>
1 over the range of distances D, andwherein the power provided to the load from the device resonator defines a work drainage rate Γ
w, and wherein the work drainage rate Γ
is configured to be set such that Γ
w=Γ
2√
{square root over (1′
+wp·
(κ
2/Γ
1·
Γ
2))} for some value of the coupling coefficient κ
in the range of distances D, wherein wp is a parameter satisfying wp>
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification