Novel coil design and analysis for high-power wireless power transfer with enhanced Q-factor

Area of Science:

• Electrical Engineering
• Electromagnetics
• Power Electronics

Background:

• Power transfer efficiency (PTE) is vital for wireless power transfer (WPT).
• The quality factor (Q) of the WPT coil is a key determinant of PTE.
• High AC losses in inner coil turns limit Q and PTE.

Purpose of the Study:

• To propose a novel method for improving the Q of WPT coils.
• To reduce AC losses in planar spiral coils for enhanced WPT.
• To achieve a higher Q factor for increased power transfer efficiency.

Main Methods:

• Investigated resistance reduction techniques by varying trace pitch, width, and thickness.
• Developed inductance and resistance models for numerical analysis.
• Performed electromagnetic (EM) simulations and fabricated a prototype for verification.

Main Results:

• The proposed coil design achieved a 19.24% increase in Q factor at 85 kHz.
• Numerical analysis results showed good agreement with EM simulations.
• Experimental validation confirmed the efficacy of the novel coil structure.

Conclusions:

• The presented resistance reduction technique effectively enhances WPT coil Q.
• Optimizing trace parameters is a viable strategy for improving planar spiral coils.
• The method offers a pathway to higher PTE in WPT applications.