Researchers complete bench testing to validate SAE wireless charging standard

EV wireless charging diagram 9-28-10

Researchers from Idaho National Laboratory (INL), along with the DOE and several automotive companies, have completed bench testing to support SAE Technical Information Report (TIR) J2954, a guideline for wireless charging that was published earlier this year.

The SAE’s TIR J2954 is designed to ensure the performance and safety of Wireless Power Transfer (WPT) systems, as well as interoperability between components from different vendors.

INL researchers tested wireless charging systems from Toyota, WiTricity, and Qualcomm. Interoperability between wireless power classes (up to 7.7 kW) and different topologies (Double D from Qualcomm and Circular Topologies) was demonstrated, with efficiencies exceeding 85-90% under aligned conditions.

TIR J2954 also covers Electromagnetic Compatibility (EMC) and Electromagnetic Field (EMF) validation of WPT systems, in order to maintain safe exposure levels for humans and medical devices.

“Idaho National Laboratory has successfully validated SAE TIR J2954 on the bench, which gives confidence in the interoperability, safety and performance values,” said Richard “Barney” Carlson, an INL engineer who managed the test program. “J2954 standardization enables any compatible vehicle to pull into a wireless power space and have automated charging without doing anything except parking. Automated wireless charging can be done in conjunction with autonomous parking.”

The results of the INL tests will be published in 2017, and a J2954 standard will be published in 2018.



Source: SAE International

  • WQ @ CeeTech Inc.

    This is good. Hope the efficiency be higher in the future.

  • Ramon A. Cardona

    Good concept but with 10-15% less efficiency and a large on the surface unit not usable in public and an obstacle in private garages, not to mention added equipment in EV’s plus added costs, sorry, I do not see this happening any time soon.

    • Electric Bill

      “… and a large on the surface unit usable”, etc… sorry, that is gibberish. I suspect you left out a word somewhere, but whatever it was I cannot guess what it was you intended to say.

      As for efficiency losses, regardless of design you will have some losses, and any design that requires you to be outside the car to connect it to a charger precludes its compatibility with any system that will allow the car to charge at opportune times such as at stoplights, stop signs, drive-thrus, or public parking stalls that are vandal-resistant. Any public installation with a long thick copper cable is vulnerable to theft or vandalism; charging pads are, by nature, more resistant to such abuses.

      Any system that makes it possible to pick up a few seconds of charge here and fhere throughout the day in a metropolis with ubiquitous charge spots will make it possible to drive a vehicle with a much smaller, lighter, less expensive battery pack, and still not be harried by “range anxiety”.

      When EVs can be cheaper, less expensive, lighter/nimbler, free of the need for long charging stops even when doing lots of non-stop driving, that is when NO ONE will have any excuse NOT to drive electric.l,, and the need for ICE cars will quickly die.

      At some point “efficiency” will become an irrelevant concept. When we, as a society, can have such a surplus of energy due to ubiquitous solar collectors, electricity can eventually become second-thought, like air or water. Energy efficiency is only significant when there is scarcity— such as when we rely on finite fossil fuels to power us through the day. We need to have a goal of a future where energy is just as free as the air we breathe, and the air we breathe is as clean as it was during pre-industrial days.

      Keep in mind that life changed in, profound ways the day PV energy dropped to mere pennies per watt— in the ’70’s, solar cells cost nearly $100./watt and has continued to drop steadily since then; it was expected it would never get cheaper than about $1/ Watt. The fact that it has continued to drop even further is the game changer that allows is to think of energy in very different ways, and to decentralize energy for much more practical use.