Wireless charger

The entanglement of wires and sockets every time the electronic devices are charged may soon fall back into the past as US researchers at the Massachusetts Institute of Technology (MIT) have sketched a relatively simple system. Wireless transmission to a laptop or MP3 digital music player is located between 3 and 5 meters away.

(Photo: playfuls.com) The key to this idea of ​​wireless charging is a resonance - a physical phenomenon that causes an object to vibrate when there is energy at a certain frequency. According to the explanation of Associate Professor Marin Soljacic at MIT, two vibrating objects at the same frequency tend to combine very well, just like on instruments, when creating melodies on an instrument, music The other instrument with the same resonance sound will receive that melody and shake. Instead of using sound vibrations, the MIT electric charging system exploits the resonance of electromagnetic waves.

Electromagnetic radiation includes radio waves, infrared rays and X-rays. Systems that use electromagnetic radiation, such as radio antennas, are not suitable to transmit energy with high efficiency because they spread energy. In all directions, waste a large amount of energy (energy) into space. To overcome this problem, the MIT team studied a special group of non-radiating objects with long-lasting resonance. When introduced into these objects, energy stays around them without escaping into the air. Energy flows (like ' tails ') can be several meters long and flicker on the surface. ' When placing another resonant object of the same frequency near these' tails ', energy can spread from one object to another, ' Soljacic, an assistant professor at the Industrial Physics Forum. organized by the American Institute of Physics in San Francisco on November 14.

Therefore, a simple copper-based antenna with long-term resonance design can transfer energy to a laptop with a dedicated resonant antenna at the same frequency. The excess or falling energy during transmission for the device will be absorbed again. The MIT-based transmission system can transmit wireless energy over a distance of 3 to 5 meters, which is not harmful to human health, can be used in rooms or batteries for mobile robots. work in the factory.

The idea of ​​providing wireless power just recently is not a new initiative but the new feature is that MIT scientists have overcome the technical barriers as well as proved the safety and feasibility of technology - the thing that 19th century physicists could not overcome.

Q.HU