Safety and efficiency of the wireless charging of electric vehicles

Abstract

Wireless power transfer is a promising method to address the concerns over charging an electric vehicle. Since wireless charging stations operate without large cables or above-ground stations, they can be conveniently installed in public locations without the risk of vandalism or weather-inflicted damage, improving the lifespan of the electric vehicle charging station. In order for wireless charging stations to become widespread, possible health effects regarding exposure to the strong electromagnetic fields present during wireless power transfer must be investigated. This work examines, first, the potential human safety hazards, second, the electronic device interference, and, third, the thermal heating effects of wireless charging systems. A 3.3 kW wireless power transfer prototype was built in order to examine these effects. Changes in the wireless power transfer efficiency due to the coil misalignment were also investigated using an automated three-axis platform. Design considerations for electric vehicle wireless charging systems and safety recommendations are presented.

A critical review on wireless charging for electric vehicles

“…Nevertheless, conducting objects, i.e. cans, between the coils can be a safety concern due to the increase in temperature caused by eddy currents [242]. Consequently, such charging systems require foreign object detection as presented in Chapter 2.6 to interrupt power transfer immediately in the event of a foreign object entering into the space between the charging pads.…”

The Spatio-Temporal Analysis of the Use and Usability Problems of EV Workplace Charging Facilities

“…Ev is still in an early technology adoption stage; it has not yet taken the role of main stream of major daily transportation option [51]. We cannot confidently approve the preposition of "WPC adds flexibility to work day and shall double the daily range" [9].…”

Dc Transformer Compensation for Efficiency Improvement of Electric Vehicles Wireless Charging Systems

“…In the design of DC transformer, it needs to reduce the leakage inductance between the primary and secondary windings [21], while in the design of LLC resonant converter, the leakage inductance between the primary and secondary can be used as resonant inductance [22]. Therefore, in the design of LLC-DC transformer, the values of the leakage inductance should be taken into account.…”