The ORNL research team recently made significant progress in wireless charging technology for electric vehicles. A 20-kilowatt wireless charging system has a charging efficiency of 90% and charging speed is three times that of commonly used plug-in electric vehicle equipment, which will help speed up the promotion of electric vehicles.

According to the Science and Technology Daily News on April 5, according to a report recently organized by the Physicists Organization Network, Madou Chensawari, head of the power electronics team at Oak Ridge National Laboratory, said: "We have achieved the concept verification of the laboratory for the past few years. Great progress. This technology is currently being combined with physical engineering, design, and scale to integrate into a number of Toyota cars, in preparation for making this technology more relevant to market needs."

The 20-kilowatt wireless charging system for cars used by the team developed in just three years has a unique structure that includes inverter power supplies, isolation transformers and coupling technology for vehicle-side electronics. In the demonstration, the researchers integrated a separate converter system into a Toyota RAV4 electric vehicle equipped with a 10 kWh battery for charging.

Since higher power levels are essential for larger cars, such as trucks and buses, researchers are targeting the 50-kilowatt wireless charging system as a next-ditch effort, and they will work with commercially available plug-in fast chargers. The power levels are matched to provide the same charging speed or to increase consumer acceptance of electric vehicles.

Industry partners that promote the development of this technology include Toyota, Cisco, Evatran, and Clemson University's International Automotive Research Center. The US Office of Energy Efficiency and Renewable Energy Automotive Technology has provided some funding for this competitive project to support the “Everywhere Challenge Plan for Electric Vehicles” proposed by the Department of Energy. Its purpose is to make electric vehicles an affordable, more convenient, and cleaner vehicle for consumers in 2022.

David Smith, vehicle system project manager, said: "Compared with plug-in charging methods, wireless power transmission is a typical paradigm shift during the charging process of electric vehicles, providing consumers with an independent, safe, efficient and convenient choice. Today's technology shows that it will be a stepping stone for vehicles to be charged during the journey and to the road of electrification.” (Reporter Hua Ling)

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