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This study introduces a new coil technique for wireless power transfer (WPT) that maintains high efficiency even with coil misalignment and size differences. The method uses an auxiliary coil to optimize magnetic flux, ensuring robust power delivery in various conditions.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Wireless Power Transfer

Background:

  • Inductively-coupled wireless power transfer (WPT) systems often suffer from reduced efficiency due to coil misalignment and size mismatches between the transmitter (Tx) and receiver (Rx).
  • Existing techniques struggle to maintain high transfer efficiency across diverse operational conditions, limiting practical WPT applications.

Purpose of the Study:

  • To present a multifunctional coil technique that significantly enhances transfer efficiency in WPT systems.
  • To address and overcome the challenges posed by misalignment and varying coil size ratios between Tx and Rx coils.
  • To achieve robust and efficient wireless power transfer adaptable to real-world scenarios.

Main Methods:

  • Incorporation of an auxiliary coil on the transmitter (Tx) side, coupled to the primary coil.
  • Utilizing a varactor on the auxiliary coil to control induced current and generate optimal magnetic flux.
  • Adaptive adjustment of magnetic flux based on alignment conditions and Rx coil size to maximize coupling.

Main Results:

  • Achieved near-null-free operation across varying misalignment conditions and for different Rx coil sizes.
  • In size-symmetric systems, efficiency reached 98.1% (perfect alignment) and remained above 60% with 135% misalignment.
  • In size-asymmetric systems (Rx coil 1/4 Tx coil size), efficiency was 96.1% (perfect alignment) and stayed above 60% with 95% misalignment.
  • Demonstrated superior performance and tolerance compared to previous methods with minimal added components.

Conclusions:

  • The proposed multifunctional coil technique offers a practical and highly efficient solution for wireless power transfer.
  • The system exhibits unprecedented tolerance to misalignment and Rx coil size variations, making it suitable for diverse applications.
  • Minimal additional components ensure a high quality factor (Q), further contributing to overall system efficiency.