High efficiency metasurface-based multi-scale wireless power transfer
AssigneeUniversity of Florida Research Foundation, Inc.
InventorsYong Kyu Yoon, Woosol Lee
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Abstract
The present disclosure provides wireless power transfer systems and methods. One such system includes a transmitter comprising a transmitter coil coupled to a power source and a transmitter metasurface slab positioned on a front side of the transmitter coil that is configured to amplify and focus a magnetic field generated by the transmitter coil towards a receiver in a non-contact manner. In such a system, the receiver comprises a receiver coil coupled to a load and a receiver metasurface slab positioned on a front side of the receiver coil configured to amplify and focus a magnetic field generated by the transmitter coil towards the receiver coil in a non-contact manner. Other systems and methods are also provided.
Claims20
A wireless power transfer system comprising:
- a transmitter comprising (i) a transmitter coil coupled to a power source and (ii) a transmitter metasurface slab positioned on a front side of the transmitter coil that is configured to amplify and focus a magnetic field generated by the transmitter coil towards a receiver in a non-contact manner;
- and
- the receiver comprising (i) a receiver coil coupled to a load and (ii) a receiver metasurface slab positioned on a front side of the receiver coil configured to amplify and focus a magnetic field generated by the transmitter coil towards the receiver coil in a non-contact manner,
- wherein the receiver metasurface slab is configured to operate in a magnetic resonance coupling wireless power transfer mode at a near-field frequency band and operate in a radiative wireless power transfer mode at a far-field frequency band for wireless power transfer based on a current distance between the receiver and the transmitter,
- wherein the transmitter metasurface slab and the receiver metasurface slab each comprise an array of metasurface unit cells,
- wherein the receiver metasurface slab has a capacitor connected to each of the metasurface unit cells in parallel, wherein a value of the capacitor is selected to tune a resonant operating frequency of the receiver to the near-field frequency band, wherein for the selected value of the capacitor, the receiver metasurface slab operates in both the magnetic resonance coupling wireless power transfer mode at the near-field frequency band and the radiative wireless power transfer mode at the far-field frequency band for wireless power transfer,
- wherein a dimension of the receiver coil determines a resonant operating frequency of the receiver for the far-field frequency band.
A method for wireless power transfer communications comprising:
- providing a transmitter comprising a transmitter coil coupled to a power source;
- positioning a transmitter metasurface slab positioned on a front side of the transmitter coil, wherein the transmitter metasurface slab is configured to amplify and focus a magnetic field generated by the transmitter coil towards a receiver in a non-contact manner;
- providing the receiver, wherein the receiver comprises a receiver coil coupled to a load;
- and
- positioning a receiver metasurface slab on a front side of the receiver coil, wherein the receiver metasurface slab is configured to amplify and focus a magnetic field generated by the transmitter coil towards the receiver coil in a non-contact manner,
- wherein the receiver metasurface slab is configured to operate in a magnetic resonance coupling wireless power transfer mode at a near-field frequency band and operate in a radiative wireless power transfer mode at a far-field frequency band for wireless power transfer based on a current distance between the receiver and the transmitter,
- wherein the receiver metasurface slab comprises an array of metasurface unit cells,
- wherein the receiver metasurface slab has a capacitor connected to each of the metasurface unit cells in parallel, wherein a value of the capacitor is selected to tune a resonant operating frequency of the receiver to the near-field frequency band, wherein for the selected value of the capacitor, the receiver metasurface slab operates in both the magnetic resonance coupling wireless power transfer mode at the near-field frequency band and the radiative wireless power transfer mode at the far-field frequency band for wireless power transfer,
- wherein a dimension of the receiver coil determines a resonant operating frequency of the receiver for the far-field frequency band.
Dependencies are inferred from the claim text.