Science Daily February 1, 2022
Using electromagnetics researchers in Finland have developed a free-positioning wireless power transfer technology that can direct power to individual devices without needing plugs, tracking devices , or complex computing. Devices can be charged while they are moving. Multiple transmitters (Txs) are placed in a pad-like area, and the transmitter coils are optimally excited to enable robust and efficient power transfer to movable receivers within the charging area. The configuration enables almost continuous magnetic flux path from a set of Tx coil(s) to another set of Tx coil(s) through the receiver coil ferrite core ensuring efficient power transfer throughout the whole Tx coverage area. The position and orientation of the receiver is detected only from the Tx-side measurements. In experiments the prototype showed DC-to-DC efficiency of 91% with only 1% variation in most of the Rx positions. According to the researchers with a bit more development this technology could even charge electric cars on the road…read more. Open Access TECHNICAL ARTICLEÂ