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Updated: Feb 25, 2026

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An Adaptive Impedance Matching Network with Closed Loop Control Algorithm for Inductive Wireless Power Transfer.

Zhidong Miao1, Dake Liu2, Chen Gong3

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Sensors (Basel, Switzerland)
|August 2, 2017
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Summary

This study introduces an adaptive impedance matching network (IMN) for inductive wireless power transfer (IWPT) systems. The novel IMN enhances power transfer efficiency and output stability despite varying coil distances.

Keywords:
adaptive IMN controlefficiencyimpedance matching network (IMN)inductive wireless power transfer (IWPT)output power

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Area of Science:

  • Electrical Engineering
  • Wireless Power Transfer Technologies

Background:

  • Inductive wireless power transfer (IWPT) systems face challenges in maintaining efficiency and stable output power with changing coil distances.
  • Existing systems often struggle with performance degradation due to variations in coil coupling and impedance mismatches.

Purpose of the Study:

  • To develop and present a novel adaptive impedance matching network (IMN) for IWPT systems.
  • To improve power transfer efficiency and output power stability by automatically adapting to coil distance variations.

Main Methods:

  • Implementation of an adaptive IMN within an IWPT system operating at 125 kHz.
  • Utilization of a closed-loop control algorithm to continuously adjust capacitors for impedance matching and output power regulation.
  • Testing the system's performance under varying coupling coefficients (0.05 to 0.8) for a 2 W load.

Main Results:

  • The adaptive IMN system demonstrated significant improvements in power transfer efficiency compared to series resonant and fixed IMN IWPT systems.
  • Efficiency gains reached up to 31.79% and 60% across a wide range of coupling coefficients.
  • The system successfully maintained stable output power of 2 W despite coil distance variations.

Conclusions:

  • The proposed adaptive IMN is an effective solution for enhancing the performance of IWPT systems.
  • Automatic impedance matching and power control are crucial for robust wireless power transfer.
  • This technology offers a pathway to more reliable and efficient wireless charging solutions.