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Updated: Apr 8, 2026

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A Fast-Charging Inductive-Capacitive Dual-Mode Orthogonal Orientation-Independent Switched-Mode Wireless Power

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    This study introduces a novel dual-mode wireless power transfer (WPT) system for batteryless implantable medical devices (IMDs). The system significantly accelerates charging time and enhances robustness, enabling faster and more reliable power delivery to critical medical implants.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Materials Science

    Background:

    • Batteryless implantable medical devices (IMDs) face challenges in power delivery due to size constraints, orientation variability, and signal attenuation.
    • Existing wireless power transfer (WPT) systems struggle with slow energy accumulation and link instability for IMDs.

    Purpose of the Study:

    • To develop an efficient and robust WPT system for batteryless IMDs.
    • To improve charging speed and reliability for medical implants.

    Main Methods:

    • A novel Inductive-Capacitive dual-mode WPT system combining a split rectifier (REC) architecture with temporal energy combining.
    • Implementation of an orthogonal coil-fed cuboid receiver for orientation-independent operation.
    • Integration of a load-isolating switch (LIS) to minimize leakage during startup.

    Main Results:

    • Achieved approximately 3.4x faster charging compared to prior art (TEG/solar).
    • Demonstrated a 4x reduction in charging time with a 4x60-stage split-rectifier compared to a 240-stage conventional design.
    • Minimum input power sensitivity of -26 dBm (2.5 μW) and operation with input amplitudes down to ~30 mV.

    Conclusions:

    • The proposed WPT system offers a compact, fast-starting, and spatially robust solution for powering IMDs.
    • The dual-mode inductive-capacitive approach enhances charging efficiency and link stability.
    • This technology has the potential to advance the capabilities of batteryless IMDs.