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    Area of Science:

    • Electrical Engineering
    • Power Electronics
    • Integrated Circuits

    Background:

    • Wireless Power Transfer (WPT) systems require efficient and adaptable power transmitters.
    • Existing WPT transmitters often lack automatic reconfiguration capabilities, limiting their performance under varying load conditions.
    • Integrated circuit design for WPT necessitates optimizing efficiency, chip area, and transient response.

    Purpose of the Study:

    • To develop a fully integrated reconfigurable transmitter for wireless power transfer applications operating at 13.56 MHz.
    • To enable automatic switching between half-bridge and full-bridge modes based on secondary side operating conditions.
    • To enhance end-to-end (E2E) efficiency and reduce the secondary chip area while maintaining a fast load transient response.

    Main Methods:

    • Design and implementation of a transmitter IC using a 0.18 μm CMOS process.
    • Integration of a primary equalizer-assisted control system.
    • Development of a control strategy for automatic reconfiguration based on sensed secondary side parameters.
    • Utilizing constant off-time and hysteretic control techniques.

    Main Results:

    • Demonstrated instant load transient response.
    • Achieved increased end-to-end (E2E) efficiency compared to previous designs.
    • Reduced the secondary chip area by 10%.
    • The reconfigurable transmitter operates at 13.56 MHz.

    Conclusions:

    • The proposed reconfigurable transmitter offers significant improvements in efficiency and form factor for wireless power transfer.
    • Automatic mode switching enhances adaptability to different operating conditions.
    • The design achieves a favorable trade-off between efficiency, chip area, and operating range.