2023-07-25 08:32:00
Engineers at Aalto University have created a new system that could enable more efficient wireless power transmission over greater distances.
Currently, wireless charging requires a device to be placed on a pad or dock, which isn’t much more convenient than wired charging. The intention is to achieve a load without the need for contact with any surface.
Current wireless charging technologies use magnetic induction to transfer power over short distances, but this limits the charger’s range and the amount of power that can be transferred.
It is noteworthy that a device to be marketed has not yet been developed. The Aalto team has only developed a new dynamic theory from two loop antennas.
By adjusting the currents in the antennas, they were able to suppress radiation resistance in the loops and increase efficiency. Even when placed 18 cm apart, the energy transfer efficiency remained high at over 80%.
“We wanted to balance the effective energy transfer with the radiation loss that always happens over greater distances,” said Nam Ha-Van, lead author of the study. “It turns out that when the currents in the loop antennas have equal amplitudes and opposite phases, we can cancel the radiation loss, thus increasing efficiency.”
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