Sightings of cool technology at SAE’s WCX2017 World Congress

Charging EVs wirelessly
This wireless charging mat which is a bit over two-feet square can put out up to 20 kW. The mat was devised by the Dept. of Energy’s Oak Ridge National Laboratory. The wireless charging platform developed meets the safety protocols of wireless charging standards. The wireless charging standard is SAE J2954, though the standard has yet to be finalized. Oak Ridge researcher Veda Prakash Galigekere said the mat shown here can operate at either 20 kHz or 85 kHz, the resonant charging frequency the SAE standard dictates. The challenging part of devising coils like this, says Galigekere, is getting them to meet the stringent electromagnetic field regulations that apply while maintaining high power transfer height, efficiency, and density. ORNL has also transmitted 20 kW to a Toyota RAV4 EV with over 98 % coil-to-coil efficiency.
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