Abstract

Overview

Wireless charging technologies for electric vehicles present certain advantages over traditional wired methods by enhancing mobility, reducing safety risks associated with high voltage cables, and decreasing the costs and environmental impact of power adapters and battery waste. This paper conducts a comparative study on multiple coil geometries used in wireless power transfer.

Findings

• Analyzed efficiency, coupling coefficient, mutual inductance, and magnetic flux density production of different coil geometries.
• Determined that coil geometry, current excitation, and shielding techniques significantly affect magnetic flux leakage in the Wireless Electric Vehicle Charging (WEVC) system.
• Proposed an analytical framework for a WEVC system using electromagnetic resonance coupling.
• Investigated safety considerations, focusing on the effects on humans in various scenarios during the charging process.

Conclusion

The study reveals that WEVC systems can achieve high levels of power transfer, concurrently increasing magnetic flux leakage around the coils. Safety distances for humans and animals were established based on specific coil arrangements and shielding methods. Specific safety thresholds for SAR levels were identified under various conditions, adhering to the Non-Ionizing Radiation Protection (ICNIRP) standards, confirming distances deemed safe for public exposure and providing guidelines for safe human proximity during EV charging sequences.