Wireless energy transfer

摘要

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.

主权项

1. An energy transferring system, comprising:
a source-side resonator for receiving an energy, wherein the source-side resonator has a first resonant frequency; an intermediate resonant module having a second resonant frequency substantially the same with the first resonant frequency, wherein the energy on the source-side resonator is coupled to the intermediate resonant module, such that non-radiative energy transfer is performed between the source-side resonator and the intermediate resonant module, and the coupling between the source-side resonator and the intermediate resonant module corresponds to a first coupling coefficient; and a device-side resonator having a third resonant frequency substantially the same with the second resonant frequency, wherein the energy coupled to the intermediate resonant module is further coupled to the device-side resonator, such that non-radiative energy transfer is performed between the intermediate resonant module and the device-side resonator, and the coupling between the intermediate resonant module and the device-side resonator corresponds to a second coupling coefficient; wherein the coupling between the source-side resonator and the device-side resonator corresponds to a third coupling coefficient, wherein the source-side resonator, the intermediate resonant module, and the device-side resonator are movable relative to one another, and wherein: the source-side resonator has a resonant frequency ω1, an intrinsic loss rate Γ1, and an intrinsic quality factor Q1=ω1/(2Γ1); the device-side resonator has a resonant frequency ω2, an intrinsic loss rate Γ2, and an intrinsic quality factor Q2=ω2/(2Γ2); the intermediate resonant module has a resonant frequency ω3, an intrinsic loss rate Γ3, and an intrinsic quality factor Q3=ω3/(2Γ3), the first coupling coefficient is κ1 and the second coupling coefficient is κ2, and wherein the intrinsic loss rates satisfy κ1/√{square root over (Γ1Γ3)}>1 and κ2/√{square root over (Γ3Γ2)}>1 for a range of distances between the source-side resonator, the intermediate resonant module, and the device-side resonator.