Wireless Charging Breakthrough: Over 80% Efficiency for Long Distance
Wireless Charging Breakthrough: Over 80% Efficiency for Long Distance
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Wireless Charging Breakthrough: Over 80% Efficiency for Long Distance
Wireless Charging Technology Sees a Revolutionary Breakthrough with Efficiency Exceeding 80% for Long-Distance Transmission.
Engineers at Aalto University in Finland have developed an enhanced long-distance wireless charging method that marks a significant advancement in the field by deepening the theoretical understanding of wireless power transmission through improved interaction between transmitting and receiving antennas, utilizing the phenomenon of “radiation suppression.” This surpasses traditional induction methods.
While short-distance charging through induction pads is highly efficient due to the close-range transfer of electrical energy using magnetic fields, efficiency sharply declines when charging over longer distances. New research demonstrates that this high efficiency can be maintained over extended distances by suppressing the radiation resistance of the circular antennas used for both transmitting and receiving power.
Previously, this laboratory had also pioneered an omnidirectional wireless charging system, allowing devices to charge in any direction. They have now expanded upon this work with a novel wireless charging dynamic theory and created a method for analyzing any wireless power transmission system, enabling a more comprehensive evaluation of power transmission efficiency, both at short and long distances, a feat never before achieved.
They then tested the charging between two circular antennas and determined that radiation suppression is a mechanism that contributes to improving transmission efficiency. The research reveals that at distances approximately five times the size of the antennas and using the optimal frequency range within 100 megahertz, transmission efficiency exceeding 80% can be achieved.
Researchers note that this wireless power transmission is not only vital for small smart devices like smartphones but also holds potential benefits for biomedical implants and similar devices. The latest research results have recently been published in the “Applied Physics Reviews” journal.
Nam Ha-Van, a postdoctoral researcher at Aalto University, said, “We aim to effectively balance energy transmission and long-distance radiation losses. It turns out that when the current in the circular antennas has equal amplitudes and opposite phases, we can counteract radiation losses, thereby enhancing efficiency.”
“All of this represents a significant breakthrough in the field of wireless charging and offers promising applications for various electronic devices and medical implants.”
