Abstract

Overview

Wireless charging technology is designed to address several limitations associated with the traditional wired methods of charging electric vehicles, such as restricted mobility, safety hazards with high voltage cables, cost issues, and environmental concerns due to increased battery waste.

Methodology and Findings

• The study conducts a comparative analysis of different coil geometries within wireless power transfer systems, focusing on their efficiency, coupling coefficient, mutual inductance, and magnetic flux density.
• It was found that coil geometry, current excitation, and shielding strategies significantly impact magnetic flux leakage in a Wireless Electric Vehicle Charging (WEVC) system.
• An analytical framework using electromagnetic resonance coupling was proposed to evaluate the safety of the WEVC system.
• Exposure measurements were taken at various distances from the coils using 3-D FEA ANSYS Maxwell Software. The findings highlight that magnetic flux leakage is greater when the power transfer is high.

Safety and Conclusion

The study establishes safe distances for human and animal presence during vehicle charging processes. Safe distances vary depending on coil type, excitation current, and use of shielding. Notably, at distances greater than 600 mm, the exposure to non-ionizing radiation is within safe, regulated limits according to ICNIRP standards.