Wireless charging advances with selection of 85-kHz charging frequency

  • 03-Dec-2013 04:01 EST
From 6-27-12 article by Ashley.jpg

Delphi has developed a concept for a parking lot or driveway wireless charging station.

An SAE International volunteer task force working on a standard for wireless charging of electric vehicles has agreed on the frequency (85 kHz) and the power levels that should be used. “After three years of international collaboration and investigation within the team, consensus has been reached on a nominal common frequency of operation for the light-duty vehicle guideline,” said Jesse Schneider, Chair of the J2954 Task Force for Wireless Power Transfer (WPT) of Light Duty, Electric, and Plug-in Vehicles. “A common frequency of operation for WPT is essential.” Made up of OEMs, WPT suppliers, industry experts, and government representatives, the task force also nailed down the power transfer levels: the first one is identified as WPT1 and has a maximum transfer level of 3.7 kW; for WPT2 it is 7.7kW; and for WPT3 it is 22 kW. The task force plans to complete by early 2014 a Technical Information Report (TIR) on these and other “interoperability” aspects of wireless vehicle charging (e.g., coil geometries and alignment), according to Schneider, who serves as Fuel Cell, EV, Hydrogen and Standards Development Manager at BMW of North America. He said the TIR will be followed by publication of an updated J2954 standard within a year or two. For more information, or to join the task force, contact SAE’s Pat Ebejer at pebejer@sae.org.

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