Wireless energy transfer
AssigneeMit
InventorsAristeidis Karalis, Andre B. Kurs, Robert Moffatt, John D. Joannopoulos, Peter H. Fisher, Marin Soljacic
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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.
Claims27
A source assembly for use with a wireless power system including 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 ω2, an intrinsic loss rate Γ2, and an intrinsic quality factor Q2=ω2/(2Γ2)>100, the source assembly comprising:
- a source resonator having a resonant frequency ω1, an intrinsic loss rate Γ1, and an intrinsic quality factor Q1=ω1/(2Γ1)>100;
- and
- a current probe configured to measure a current in the source resonator,
- 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 K.
A device assembly for use with a wireless power system including 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 ω1, an intrinsic loss rate Γ1, and an intrinsic quality factor Q1=ω1/(2Γ1)>100, the device assembly comprising:
- a device resonator having a resonant frequency ω2, an intrinsic loss rate Γ2, and an intrinsic quality factor Q2=ω2/(2Γ2)>100;
- and
- a current probe configured to measure a current in the device resonator,
- 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.
A vehicle configured for use with a wireless power system including 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 ω1, an intrinsic loss rate Γ1, and an intrinsic quality factor Q1=ω1/(2Γ1)>100, the vehicle comprising:
- a device resonator having a resonant frequency ω2, an intrinsic loss rate Γ2, and an intrinsic quality factor Q2=ω2/(2Γ2)>100;
- a load coupled to the device resonator to receive power from the device resonator;
- and
- a current probe configured to measure a current in the device resonator,
- 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.
Dependencies are inferred from the claim text.