Science Daily July 27, 2021
A transmitter traditionally must first detect a device presence and position to be able to send energy in its direction. Researchers in Finland have designed a proof-of-concept device which creates power transfer channels in all directions, automatically tuning channels when receiving devices are in motion. Because of self-tuning, the device does not need complex electronics to connect with receivers embedded in devices and it can be moved freely within a wide charging range. By winding the coils in a specific way, they created two kinds of electromagnetic fields: one going outwards and the other around. These fields couple the receiver and transmitter to achieve efficient power transfer. They measured the transmitter high efficiency at 90% at up to 20 centimeters distance, however the efficiency decreases at longer distances. As the efficiency is dependent on the size of the transmitter and receiver, it can be improved with right engineering. Whereas this is a successful proof of concept safety tests and improvements need to be done…read more. TECHNICAL ARTICLEÂ