High-Power Wireless Charging Of Heavy Duty EVs: Techniques, Challenges And Limitations
by John M. Miller and John Wolgemuth, Momentum Dynamics, Malvern, Penn., How2Power Today, Dec 15 2017
Focus:
Commercial high-power wireless charging equipment for light duty (LD) electric vehicles (EVs)
has been available for several years. Suppliers now offer wireless EV supply equipment in power
ratings from 3.7 kW to 11.1 kW, and up to 22-kW developmental systems that are designed per SAE
J2954. Also in development is a sister standard, SAE J2954/2 Wireless Power Transfer of Heavy
Duty Plug-In Electric Vehicles and Positioning Communication, which addresses wireless charging
up to 200 kW. This 20-page article evaluates the practical and safety-related limitations to
designing high-power WPT systems for heavy duty (HD) EVs. It begins by reviewing the operation
of WPT systems for EVs and identifies the performance metrics to be evaluated in this article.
These include the limitations on coefficient of coupling (k) for the coupler; thermal
constraints on the current density in the Litz cable given air cooling; safety considerations
related to electromagnetic field intensity at the surface of the ground assembly coil; and
practical limits set by insulation materials. Key parameters are calculated for designing a
series-series (S-S) compensated WPT system, a circuit model for this system is presented, and
simulation results are presented and discussed.
What you’ll learn:
- How to understand the performance and safety requirements of high-power wireless charging for heavy duty electric vehicles
- How to understand the design challenges and design techniques associated with wireless charging at power levels above 100 kW
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