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
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