Dengyo, Volvo Wirelessly Transmit 10kW of Electricity to Distance of 4m

Jul 8, 2012
Hideyoshi Kume, Nikkei Electronics
Nihon Dengyo Kosaku and Volvo Technology Japan succeeded in wirelessly transmitting more than 10kW of electricity to a distance of 4m or more.
Nihon Dengyo Kosaku and Volvo Technology Japan succeeded in wirelessly transmitting more than 10kW of electricity to a distance of 4m or more.
[Click to enlarge image]
The rectenna was made by combining eight rectennas whose output is about 1.3kW each.
The rectenna was made by combining eight rectennas whose output is about 1.3kW each.
[Click to enlarge image]

Nihon Dengyo Kosaku (Dengyo) Co Ltd and Volvo Technology Japan developed a wireless power transmission system for electric vehicles (EVs).

This time, they employed a method that uses microwaves and succeeded in wirelessly transmitting more than 10kW of electricity to a distance of 4-6m.

The system was realized by developing a high-efficiency "rectenna." A rectenna is a device made by combining an antenna and a rectifier, and it converts electromagnetic waves into direct-current electricity. This time, Dengyo and Volvo Technology Japan developed a rectenna that has a high output power of 10kW and a high conversion efficiency of about 84%. The efficiency is twice as high as those of the rectennas that Dengyo developed in the past.

The output power per area is 3.2kW/m2 or higher, which Dengyo claims is the "world's highest output." The frequency of the microwave is 2.45GHz.

Volvo Technology Japan was established by Sweden-based AB Volvo in 2012 in Tokyo as its R&D base in Asia. The Volvo Group plans to apply the newly-developed wireless power transmission technology to commercial vehicles such as buses and trucks, Volvo Technology Japan said.

動画 The experiment (0:51)

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