Wireless power transmission at 5 meters

Wires from numerous electronic devices to power outlets litter many apartments. We have to make a dozen outlets in each room so that the wires are not so noticeable. But if the invention of a group of physicists from the South Korean university KAIST goes into mass production, then one outlet in each room will suffice. All devices will receive power from a single hub, which transmits energy over a distance of 5 meters.

Currently, the most advanced technology of energy transfer is the magnetic resonance system (Coupled Magnetic Resonance System, CMRS), developed at the Massachusetts Institute of Technology in 2007. It provides current transfer at a distance of 2.1 meters. Since that time and until now, nothing new has been invented in this area, and the CMRS itself has come up against some restrictions that did not allow it to go into mass production: for example, the complex configuration of coils, large dimensions, high transmission frequency and too high sensitivity to external interference, such as human presence.

Scientists from South Korea have developed a new transmitter of electricity - a resonant system of dipole coils (Dipole Coil Resonant System, DCRS), operating at a distance of up to 5 meters between the receiver and transmitter. At first glance, the system is devoid of many of the CMRS drawbacks; rather compact 10x20x300 cm coils are used here, which can be easily installed in the apartment walls.
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General DCRS configuration

As the experiment showed, at a frequency of 20 kHz, the maximum output power was 1403 W at a distance of 3 meters, 471 W at 4 m and 209 W at 5 m. When working with a power of 100 W, the efficiency is 36.9% at 3 m, 18, 7% at 4 m and 9.2% at 5 m. That is, the technology completely allows you to power even modern large LCD TVs (40 W) at a distance of 5 meters using wireless transmission. Another thing is that 400 watts will be “pumped out” of the power grid, but no wires.

Even with low efficiency, the technology is still useful in some exceptional situations. For example, in March of this year, a group of Korean physicists managed to transfer 10 watts to control equipment, similar to that installed at the Fukushima nuclear power plant, at a distance of 7 meters.