Wireless charger development history

- Jul 09, 2018-

As early as the 1930s, Michael Faraday discovered that the surrounding magnetic field changed.


The current will generate current in the wire. In the 1890s, Serbian scientist Nikola Tesla applied for the original patent.


But unfortunately, research in this area has been delayed for a century. The biggest obstacle is that transmission efficiency is too low and dangerous. Electromagnetic radiation is only suitable for transmitting information and is not suitable for transmitting energy. Because radiation is non-directional, energy is wasted in useless space. It has been envisaged to use directional electromagnetic radiation, such as lasers, but it is not very operably and dangerous.


Professor Xu Shuyuan from the Department of Electronic Engineering of the City University of Hong Kong successfully developed the "Wireless Battery Charging Platform" in the early years. It can put several electronic products on a charging platform, without external wires, and automatically charge and charge through low-frequency electromagnetic fields. Time is no different from traditional chargers. However, this technology still requires the product to be in contact with the charger. It mainly uses the near-field electromagnetic coupling principle.


Researchers at the Massachusetts Institute of Technology have made new progress in wireless transmission of power. They used a power source two meters away to light up a 60-watt bulb.Solyicic's design, non-radiative wireless energy transmission has a distance limit, the smaller the receiver, the shorter the distance. He calculated that laptop-sized objects could receive wireless energy transmission within a few meters. "This way, by installing a single source in each room, you can power the entire home laptop."