The historical development of wireless charging technology

- Jan 15, 2018 -

The historical development of wireless charging technology


In 1890, the physicist and electrical engineer, Nicola Tesla (NikolaTesla), had done a wireless transmission test to achieve AC power generation. The international unit system of magnetic induction is also named after his name. Wireless transmission method is Tesla's concept of the earth as a conductor, the earth's ionosphere as the outer conductor by magnifying the transmitter to the radial wave oscillation mode, establish the frequency resonance of about 8Hz between the earth and the ionosphere, and then use the surface electromagnetic wave transmission energy around the earth. But because of the lack of financial resources, the bold idea of Tesla has not been realized. Although posterity has fully proved the feasibility of this scheme theoretically, the world has not yet realized the great harmony, and it is impossible to broadcast the energy and get free in the world. Therefore, a great scientific ideas that aborted.


In June 7, 2007, the research team at the Massachusetts Institute of Technology published the research on the web site of the American journal Science. The research team applied the resonance to the transmission of electromagnetic waves, and succeeded in catching the electromagnetic waves. The copper coil was used as the electromagnetic resonator, and a coil was attached to the power transmission side. The other group was receiving the electric power. After sending out the electromagnetic wave of a certain frequency, the transmission is transmitted through the electromagnetic field to the receiver. The technology, what they call "wireless power", has been successfully powered by a 60 watt light bulb two meters away. The technology's farthest transmission distance is only 2.7 meters, but researchers believe the power can be recharged in this range. And only a single power supply can be supplied to the electrical appliances in the whole house.


In February 2014, computer manufacturer DELL joined the A4WP camp. At that time, the top executives at the camp said that it would upgrade technology and support DELL's computer manufacturers' super core for wireless charging. The traditional laptop computers on the market, most of the power supply exceeds 50 watts, but the super pole uses Intel's low-power processor, and it will become the first batch of notebook computers that use wireless charging. Before that, wireless charging technology has been related to "small" mobile devices, such as smart phones, small size tablets, and so on. However, one of the three camps wireless charging A4WP (Wireless Power Consortium), announced that its technology standard has been upgraded to support the charging power to 50 watts, means that the notebook computer, tablet and other large power equipment, also can realize the wireless charging.


In October 2017, the mobile phone family supporting wireless charging has welcomed 3 new members: iPhone 8, iPhone 8 Plus and iPhone X -- they all support the Qi wireless charging standard, which aims to bring more convenience to users, and the phone itself looks cool.


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