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Researchers Achieve 80+% Efficiency For Long-Distance Wireless Charging

Researchers Achieve 80+% Efficiency For Long-Distance Wireless Charging

Researchers at Aalto University in Finland have achieved a new milestone in wireless charging. Efficiency had always dropped dramatically as the distance between wireless power transmitter and receive increased. The Aalto researchers, however, achieved 80+% efficiency at a distance of 7” between the transmitter and receiver antennas.

To do this, the team developed a new dynamic theory of wireless charging. They increased efficiency by suppressing radiation resistance. This was accomplished through adjusting currents to have equal amplitudes and opposite phases, in the two circular antennas of 2.8” diameters.

The results create the potential to expand the range of distances of compact wireless power-transfer devices. This could have interesting applications for highly-sealed lighting applications, as well as electric vehicle wireless charging.

The research was published in the journal Physical Review

Image: Nam Ha-Van/Aalto University


author avatar
David Shiller
David Shiller is the Publisher of LightNOW, and President of Lighting Solution Development, a North American consulting firm providing business development services to advanced lighting manufacturers. The ALA awarded David the Pillar of the Industry Award. David has co-chaired ALA’s Engineering Committee since 2010. David established MaxLite’s OEM component sales into a multi-million dollar division. He invented GU24 lamps while leading ENERGY STAR lighting programs for the US EPA. David has been published in leading lighting publications, including LD+A, enLIGHTenment Magazine, LEDs Magazine, and more.


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