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This study introduces an indirect impedance matching method for wireless charging systems with variable coil spacing. The new approach enhances efficiency and stabilizes output voltage without real-time parameter identification.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Wireless Power Transfer

Background:

  • Real-time coil spacing variations in wireless charging (UAVs, electric boats, trams) challenge traditional impedance matching.
  • Direct methods struggle with timely and accurate mutual inductance identification, hindering system efficiency.

Purpose of the Study:

  • To propose an indirect impedance matching method that bypasses parameter identification for improved wireless charging efficiency.
  • To enhance system efficiency and stabilize output voltage in dynamic wireless power transfer applications.

Main Methods:

  • Developed an indirect impedance matching method based on controlling real-time voltage gain, independent of mutual inductance.
  • Implemented a single-sided detuning design for inverter soft switching to boost efficiency.
  • Proposed a compound control strategy for a series-series-compensated topology with dual-side power control.

Main Results:

  • Achieved a peak DC-to-DC efficiency of 91.58% at an optimal output resistance of 28.9 Ω.
  • Demonstrated a 7% efficiency improvement at an output resistance of 100 Ω using the proposed strategy.
  • Validated the effectiveness through a hardware prototype.

Conclusions:

  • The indirect impedance matching method effectively addresses challenges in dynamic wireless charging.
  • The compound control strategy enhances both efficiency and output voltage stability.
  • This approach offers a robust solution for variable-spacing wireless power transfer systems.