Audi wireless charging

Audi wireless charging

SAE International announced approval of the “SAE TIR J2954 Wireless Power Transfer for Light-Duty Plug-In/ Electric Vehicles and Alignment Methodology,”.

Thankfully this decision/proclamation comes well before mass adoption of the tech, unlike in the DC fast charging space where we find a CHAdeMO vs CCS vs Tesla situation.

The SAE TIR J2954 protocol requires the use of the 85 kHz (81.39 - 90 kHz) frequency, and defines four classes/power levels (new higher levels will be added later):

  • 3.7kW (WPT 1) specified in TIR J2954
  • 7.7kW (WPT 2) specified in TIR J2954
  • 11kW (WPT 3) to be specified in revision of J2954
  • 22kW (WPT 4) to be specified in revision of J2954
The documentation will be available on May 31. The standard won't be officially finalized by 2018, although we think the paper this month will basically set the direction of the tech.

"With wireless charging quickly becoming mainstream for consumer electronic devices in low power applications, standardization is needed for commercialization of high power wireless power transfer (WPT) of PH/EVs.

In order to achieve a basis for the start of commercialization for WPT, it is important to define criteria for safety and electromagnetic limits, efficiency and interoperability targets, as well as a test setup for the acceptance of WPT – all of which is addressed in SAE TIR J2954.

SAE TIR J2954 is the first step in standardization and was developed by SAE International’s PH/EV Wireless Power Transfer committee, established in 2010."

"TIR J2954 WPT compatible systems have been built by automakers and suppliers and are currently under test with a cross-industry team with the US Department of Energy, Idaho and Argonne National Labs. The test data, first in the bench and later in the vehicle, will be used to finalize the Standard by 2018 to support the roll out of this technology.

For more information about “SAE TIR J2954 Wireless Power Transfer for Light-Duty Plug-In/ Electric Vehicles and Alignment Methodology,” visit

Jesse Schneider (the Chair of SAE International’s Wireless Power Transfer committee and is the Fuel Cell, Electric Vehicle and Standards Development Manager at BMW North America) said:

Wireless power transfer, using SAE TIR J2954 is a game changer for PH/EVs. This first in a series of documents will enable consumers to simply park their vehicles into spaces equipped with TIR J2954 equipment and walk away without doing anything to charge their PH/EV.

Standardization of both the vehicle and ground infrastructure WPT has started with SAE TIR J2954. The frequency band, safety, interoperability, EMC/ EMF limits as well as coil definitions from SAE TIR J2954 enable any compatible vehicle to charge wirelessly from its WPT home charger, work, or a shopping mall WPT charger, etc. with the same charging ability.

All of this makes it possible to seamlessly transfer power over an air gap with high efficiencies. SAE TIR J2954 WPT automates the process for charging and extends the range for the vehicle customer only by parking in the right spot.”

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