Device Based On Resonant Magnetic Coupling Transfers Power at 5-Meter Distance

Published By : 19 Apr 2014 | Published By : QYRESEARCH

Researchers have developed a wireless charging device that can simultaneously charge as many as 40 phones even when the device is 5 meters away. 

This impressive device is all thanks to professor Chun T. Rim of the Nuclear and Quantum Engineering and his team at KAIST, Daejeon, Korea, who demonstrated through this study a vital improvement in the distance that electric power can be transmitted wirelessly. 

The underlying technique behind this charging device is resonant magnetic coupling and is called Dipole Coil Resonant System (DCRS). 

The first such attempt to transfer electric power in a wireless manner was done by the MIT in 2007 when they introduced a system on resonant magnetic coupling, the CMRS. This system used a magnetic field to transfer electric power wirelessly up to a distance of up to 2 meters. Since then, the field of wireless power transfer has attracted huge attention from researchers. The DCRS technology has taken CMRS to another level.    

This device is scalable, slim and is measured 20 cm in height, 10 cm in width and 3 m in length and is significantly smaller than the CMRS. In its initial stages of testing, the device has demonstrated a low Q factor, the measure of goodness of a resonant circuit, of 100 and works well even at frequency as low as 100 kHz. 

The device was also studied in a number of variant experimental conditions such as at the frequency of 20 kHz, where the device dissipated a power of 1,403 W at a distance of 3 meters 471 watts at 4 meters and 209 watts at 5 meters. For a consistent power dissipation of 100 watts, the device showed power efficiency of 9.2 % at 5 meters, 18.7% at 4 meters and 36.9% at 3 meters.  
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