Wireless charger development history

As early as the 1830s, Maikeer·fala discovered that the changes in the surrounding magnetic fields

Chemical will generate electricity in the wire. In the 1890s, Serbian scientist Nikola Tesla applied for the first patent.

Unfortunately, research in this area has been delayed for a century. The biggest obstacle is that the transmission is inefficient and dangerous. Electromagnetic radiation is only suitable for transmitting information and is not suitable for transmitting energy. Because radiation has no orientation, energy will be wasted in useless space. Some people envisage the use of directional electromagnetic radiation, such as lasers, but its operability is not strong and very dangerous.

Professor Xushuyuan of the Department of Electronic Engineering of City University of Hong Kong successfully developed a "wireless battery charging platform" in the early years. Several electronic products can be placed on a charging platform without external wires and automatically charged through low-frequency electromagnetic fields. The charging time is no different from traditional charger. However, this technology still requires the product to contact the charger. It mainly uses the near field electromagnetic coupling principle.

Researchers at the Massachusetts Institute of Technology in the United States have made new advances in wireless transmission of electricity. They used a power source two meters away to light a 60-watt light bulb.

Suoliyaqiqi's design, non-radiation wireless energy transmission has a distance limit, the smaller the receiver, the shorter the distance. He calculated that objects the size of a laptop could receive wireless energy transmission within a few meters, "so that a launch source can be installed in each room to power the laptop of the entire house. "

Suoliyaqiqi hopes to increase efficiency to 70 % to 80 % through the use of different materials and improved technologies. They believe the improved device will provide wireless charging for laptops, mobile phones and other devices within three to five years.