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Coupling invariant inductive link for wireless power delivery to a retinal prosthesis.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    This study introduces a novel inductive link with constant coupling, improving wireless power transfer stability despite a reduced coupling coefficient. This design offers a more robust solution for applications like retinal implants.

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    Area of Science:

    • Electrical Engineering
    • Biomedical Engineering
    • Wireless Power Transfer

    Background:

    • Inductive links are crucial for wireless power and data transfer, typically requiring high coupling or resonance for optimal performance.
    • Performance of traditional inductive links degrades with variations in link parameters or load, complicating driving circuit design.
    • Existing inductive coupling methods face challenges with stability and efficiency under dynamic operating conditions.

    Purpose of the Study:

    • To investigate an inductive link design that maintains constant coupling, even with variations in the system or external load.
    • To evaluate the performance trade-offs of achieving invariant coupling, specifically addressing the reduction in coupling coefficient.
    • To explore the potential of this new inductive link for specialized applications, such as powering medical implants.

    Main Methods:

    • Developed a novel inductive link architecture designed for invariant coupling.
    • Quantified the reduction in coupling coefficient compared to traditional inductive links (a 66% decrease observed).
    • Analyzed the performance benefits of constant coupling under varying environmental and load conditions.

    Main Results:

    • The proposed inductive link demonstrates stable performance due to its constant coupling feature.
    • The invariant coupling advantage compensates for the reduced coupling coefficient and large coil separation.
    • The design shows resilience against performance drops typically seen in traditional links.

    Conclusions:

    • The developed inductive link offers a more robust and stable wireless power transfer solution compared to conventional designs.
    • The invariant coupling characteristic makes it suitable for applications demanding consistent performance, such as powering retinal implants.
    • This approach mitigates the complexities associated with driving circuits in variable inductive link scenarios.