Development History of Wireless Chargers

 In 1890, physicist and electrical engineer Nikola Tesla (NikolaTesla) has already done a wireless transmission test. The International System of Units of Magnetic Induction is also named after him. The wireless transmission method conceived by Tesla is to use the earth as the inner conductor and the earth's ionosphere as the outer conductor, and establish a low-frequency resonance of about 8 Hz between the earth and the ionosphere by amplifying the transmitter in a radial electromagnetic wave oscillation mode. Use surface electromagnetic waves around the earth to transmit energy. But because of lack of financial resources, Tesla's bold vision has not been realized. Although future generations have fully confirmed the feasibility of this scheme in theory, the world has not yet achieved the same, and it is impossible to broadcast energy and obtain it for free worldwide. Therefore, a great scientific idea is still dead.

       On June 7, 2007, the research team of the Massachusetts Institute of Technology published the research results on the website of the American magazine Science. The research team applied resonance to the transmission of electromagnetic waves and successfully "grabbed" the electromagnetic waves. A copper coil was used as an electromagnetic resonator. One coil was attached to the transmitting power side, and the other was receiving the power side. After the transmitting side sends out an electromagnetic wave of a certain frequency, the electromagnetic field diffuses to the receiving side, and the power is wirelessly transmitted. The technology they call "wireless power" has been tested many times and has been able to successfully power a 60-watt light bulb two meters away. The longest transmission distance of this technology can only reach 2.7 meters, but the researchers believe that the power supply can already charge the battery within this range. And only need to install a power supply, you can power the electrical appliances throughout the house.

     In February 2014, computer manufacturer Dell joined the A4WP camp. At that time, camp-related senior officials said they would upgrade the technology to support wireless charging of ultrabooks from computer manufacturers such as Dell. Most of the traditional notebook computers on the market have more than 50 watts of power, but Ultrabooks use Intel ’s low-power processors and will be the first laptops to use wireless charging. Prior to this, wireless charging technology has been only relevant to "small" mobile devices such as smartphones and small-sized tablets. However, A4WP ("Wireless Charging Alliance"), one of the three major wireless charging camps, has announced that its technical standards have been upgraded and the supported charging power has been increased to 50 watts, which means that high-power devices such as laptops and tablets can also Realize wireless charging.

       In October 2017, the mobile phone family supporting wireless charging ushered in three new members: iPhone 8, iPhone 8 Plus and iPhone X-they all support the Qi wireless charging standard, the purpose is to bring users greater Convenient, the phone itself also looks cooler.

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