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Hyundai-Kia America and Mojo Mobility partnering on wireless fast-charging project

Hyundai-Kia America Technical Center, Inc., (HATCI) and Mojo Mobility, Inc., a wireless power technology company, have been awarded funding from the US Department of Energy’s (DOE) Office of Energy Efficiency and Renewable Energy (EERE) Vehicle Technologies (VT) program to research and develop a system for wireless fast-charging an electric vehicle at up to a 19.2 kW power transfer rate. The two have already been partnering on a DOE-funded project on high-efficiency, low-EMI and positioning-tolerant wireless charging of EVs.

Mojo Mobility’s Near Field Power technology is able to meet charging power levels ranging from 1 W to 90 W and higher for mobile devices and up to 20 kW for electric vehicles. The wireless charging systems are capable of transferring their high power without need for precise alignment between the charger and the vehicle.

Initial system design. Click to enlarge.

HATCI and Mojo Mobility are developing, implementing and demonstrating a wireless power transfer (WPT) system on a test fleet of Kia Soul EVs (earlier post) over three phases, at HATCI in Superior Twp., Michigan, and Mojo Mobility in Santa Clara, California.

  • During Phase One, the partnership developed a wireless power transfer system that has more than 85% grid-to-vehicle efficiency and is capable of transferring in excess of 10 kW to the vehicle for fast charging. The new system will allow misalignment between the energy transmitter on the ground and the energy receiver on the vehicle, making it easier and more convenient for day-to-day usage.

  • In Phase Two, the partnership collaborated to integrate a compact system optimized for the Soul EV and demonstrate full operation at a record 92% efficiency.

  • Real-world performance data will be gathered in the third and final phase of the project using five Kia Soul EVs and corresponding energy transmission units. This final phase will test the systems’ durability, interoperability, safety, and performance.


KMA and Mojo Mobility have not yet announced when the system will be available for purchase.




There has been considerable discussion on another forum as to the overall efficiency of wireless charging solutions, with some claiming that they still use the car charging system and thereby incur a further energy penalty.

Just like DC fast chargers, AFAIK they bypass the in car charger, but I have not been able to track down conclusive references to the point.

One of the participants in the discussion is a person from Plugless Power ( Evatran ) and I have requested confirmation from him that this is the case.

I will post the reply here if and when he replies.

Until then, has anyone got anything solid?

BTW, here is Evatran's spec sheet.
I could not spot anything there:

One thing which caught the eye of an EE was that the power factor is 0.65, which means that ( apparently ) the efficiency is a lot better than it would be if itwere a more usual for other purposes 1.0.


Please qualify "low-EMI".



The term will be precise, as they have laid down standards for the emissions in regulations.

I don't have them to hand, but you should be able to track them down if you are interested enough.

Presumably they have to be in the ball park of the existing 3.4kw tightly aligned wireless offerings from Evatran and Qualcomm.

One thing which caught the eye of an EE was that the power factor is 0.65, which means that ( apparently ) the efficiency is a lot better than it would be if itwere a more usual for other purposes 1.0.

Eh?  Power factor is the ratio of watts to volt-amps.  A power factor of 1.0 is much more efficient than 0.65, especially given that upstream iron losses in transformers are proportional to VA and not W.



Here's my new take on this issue: Any comments?

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