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Recently, researchers at St.
Petersburg University in Russia launched a new wireless power transmission system that can maintain 80% power transmission efficiency within a distance of 20 cm, and the transmission efficiency during the period increases with the increase of distance
.
The research results can be used in areas where
wireless charging over the air is required.
According to the Physicists Network, the new wireless power transfer system is based on the principle of resonant coupling, similar to an opera singer making a strong sound powerful enough to transmit energy to a wine glass with the same resonant frequency, causing it to shatter
.
Because magnetic fields are weakly coupled to most other objects, including the human body, wireless power transfer systems use magnetic field coupling to further reduce unintended interactions
.
The researchers reduced power losses in power transmission in two ways, thereby improving the efficiency of
wireless power transfer systems.
First, the traditional copper ring
is replaced by a "high dielectric constant and low loss dielectric resonator".
Second, unlike the commonly used magnetic dipole mode, the researchers used the magnetic quadrupole mode, which reduces radiation loss
.
The researchers said that in the future, it is planned to further improve the efficiency of the wireless power transfer system and reduce the size of the resonator to be closer to practical applications
.
Recently, researchers at St.
Petersburg University in Russia launched a new wireless power transmission system that can maintain 80% power transmission efficiency within a distance of 20 cm, and the transmission efficiency during the period increases with the increase of distance
.
The research results can be used in areas where
wireless charging over the air is required.
According to the Physicists Network, the new wireless power transfer system is based on the principle of resonant coupling, similar to an opera singer making a strong sound powerful enough to transmit energy to a wine glass with the same resonant frequency, causing it to shatter
.
Because magnetic fields are weakly coupled to most other objects, including the human body, wireless power transfer systems use magnetic field coupling to further reduce unintended interactions
.
The researchers reduced power losses in power transmission in two ways, thereby improving the efficiency of
wireless power transfer systems.
First, the traditional copper ring
is replaced by a "high dielectric constant and low loss dielectric resonator".
Second, unlike the commonly used magnetic dipole mode, the researchers used the magnetic quadrupole mode, which reduces radiation loss
.
The researchers said that in the future, it is planned to further improve the efficiency of the wireless power transfer system and reduce the size of the resonator to be closer to practical applications
.
