A research group led by Professor Keihiro Kawahara of the University of Tokyo devised and implemented a new transmitter structure, and demonstrated that devices at any location in the room can be charged wirelessly.Realization of an IoT system that does not run out of batteries is expected.
The Internet of Things (IoT) is an interconnection network between peripheral objects, and with the development of this IoT, the number of electronic devices with various functions is increasing.Currently, batteries and power cables are used to supply energy to many of these devices, but the cost of battery replacement and the complexity of wiring increase with the number of devices, so safe, autonomous, and efficient power supply is possible. It has become important.
Conventionally, wireless charging that covers a wide three-dimensional space has been difficult, but in 2017, the "quasi-static cavity resonator (QSCR)" was announced, and it is possible to generate an AC magnetic field that does not easily interfere with living organisms. It became so.However, this method has problems such as the need to install a huge conductor rod in the center of the room and the bias in the magnetic field strength distribution in the space.
Therefore, the research group focused on the point that the current on the metal plate flows in multiple directions, and devised a new approach called "Multimode QSCR" that can generate multiple magnetic field distributions.In this method, a power transmission mechanism is embedded in the wall or floor to generate an AC magnetic field that is distributed in a three-dimensional manner, so highly efficient wireless charging to the entire room is performed without installing a structure such as a conductor rod in the room. Can.This time, we implemented Multimode QSCR in a room with a size of 3m x 3m, and succeeded in sending power to receivers placed at various positions in the room.
The results of this research will enable power transmission of several tens of watts over a wide range, and are expected to be applied to IoT systems that do not run out of batteries in the future.
