Historical development of wireless charging technology
In 1890, physicist and electrical engineer Nikola Tesla had already done a wireless transmission test to achieve AC power generation. The international system of magnetic induction intensity is also named after him. The wireless transmission method conceived by Tesla is to use the Earth as an internal conductor and the Earth's ionosphere as an external conductor. By amplifying the transmitter in a radial electromagnetic wave oscillation mode, a low-frequency resonance of about 8Hz is established between the Earth and the ionosphere. Then use the electromagnetic waves around the surface of the earth to transmit energy. However, due to lack of financial resources, Tesla's bold ideas have not been realized. Although later generations have completely confirmed the feasibility of such a plan in theory, the world has not yet achieved a common goal. It is also impossible to conduct energy broadcasting and free access worldwide. Therefore, a great scientific idea is thus stillborn.
On June 7, 2007, the research team of the Massachusetts Institute of Technology published the research results on the website of the American "Science" magazine. The research team successfully "grasped" electromagnetic waves by applying resonance to the transmission of electromagnetic waves, using copper coils as electromagnetic resonators, a coil attached to the transmission power side, and another group receiving power. After the transmitter sends an electromagnetic wave of a certain frequency, the electromagnetic field spreads to the receiving party and the electric power realizes wireless transmission. This technology, which they call "wireless power", has been successfully tested on a 60-watt light bulb two meters away. The technology's maximum transmission distance is only 2.7 meters, but the researchers believe the power supply is already able to charge the battery within that range. And you just need to install a power supply to power the whole house.
In February 2014, Dell, a computer manufacturer, joined the A4WP camp. At that time, the relevant senior officials of the camp stated that they would upgrade the technology and support the ultra-polar books of Dell and other computer manufacturers for wireless charging. Most of the conventional laptops on the market have more than 50 watts of power, but the ultrabooks use Intel's low-power processors and will be the first laptops to use wireless charging. Previously, wireless charging technology had only been associated with "small" mobile devices such as smartphones and small-sized tablets. However, A4WP(`` Wireless Charging Alliance "), one of the three major camps for wireless charging, recently announced that its technical standards have been upgraded and the supported charging power has increased to 50 watts, which means that high-power devices such as laptops and tablets can also be implemented. Wireless charging.
In October 2017, the mobile phone family, which supports wireless charging, ushered in three new members: iPhone 8, iPhone 8 Plus, and iPhone X -- all of which support Qi wireless charging standards in order to provide users with greater convenience. The phone itself looks cooler.
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