Wireless charging for electric vehicles with 120 kW: as fast as at the gas station?

Scientists from the Department of Energy National Laboratory, Oak Ridge demonstrated 120-kilowatt wireless charging system for motor vehicles - six times more powerful than ORNL prior art and a big step in the direction of reducing the charging time. Scientists hope that one day it will be possible to charge electric vehicles on the "gas" stations as fast as they do at the gas station right now with conventional cars on gasoline engine. Wireless installation transmits 120 kilowatts of power with 97% efficiency, which is comparable with conventional high-energy fast charging wire.

Wireless charging for electric vehicles with 120 kW: as fast as at the gas station?

In the laboratory, scientists have shown how to transfer energy through a six-inch air gap between the two magnetic coils and charge the battery.

As will be fueled cars?

Researchers from ORNL created and demonstrated the world's first 20-kilowatt wireless charging system which is modified for applications such as commercial trucks. "It was important to keep the same size or smaller, that were in the previous iteration, to encourage commercial adoption," says project manager Veda Galigekere.

"We decided coils a design problem with the system is not heated and does not create any security issues. Any energy loss during transmission is minimal. "

To dial a 120 kilowatt, a team from ORNL created a new coil design that is optimized using the latest silicon carbide power electronics for easy and compact system. The system architecture takes energy from the network and converts it into a high frequency alternating current which generates a magnetic field transmitting energy through a large air gap. Once the energy is transferred to the secondary coil, it is converted back to DC and stored in the vehicle batteries.

Further goals - to develop a system for the transmission of 350-400 kW and reduce charging time to 15 minutes.

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