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Car future: How far is wireless charging from us?
At the end of the 20th century, various rechargeable electronic devices became popular, and the theory of electromagnetic induction was applied to charging technology. Now, it is the turn of electric cars to become popular. What new developments can wireless charging technology have?
In 1831, Faraday discovered the phenomenon of electromagnetic induction with two coils, let us know that even without wires, the current can be prevented from passing through the space. At the end of the 20th century, various rechargeable electronic devices became popular, and the theory of electromagnetic induction was applied to charging technology. Now, it is the turn of electric cars to become popular. What new developments can wireless charging technology have?
The first product to use wireless charging technology was the electric toothbrush, which appeared in the 1990s and can be recharged after being used on a special base. This technology is now widely used on portable electronic devices such as mobile phones and tablets. So can an electric car that needs to be recharged use wireless charging?
In fact, the history of wireless charging for cars is as long as that of electric toothbrushes. The wireless charging technology for vehicles appeared in the 1990s and was developed by GM and its subsidiary Delco, but the first one to be promoted and applied by ETL is the American Evatran's Plugless L2 system, which has been in the Chevrolet Volt and Nissan. Installed on the Leaf. However, these wireless charging schemes and charging piles are actually a nature. A mat is placed on the ground, and there is a current collector on the car. It can be charged when it is parked on it. The only thing left is to plug in and pull out the interface.
One aspect is to expand the wireless charging point from home to the road. Now there are several wireless charging roads in trial operation, but the charging targets are buses. For example, South Korea has built a 12-kilometer wireless charging bus line in 2013, and similar buses are operating in Germany, Italy and other countries including China. In addition to the wireless charging road, it is more popular to use a bus stop with a wireless charging point and a taxi stop to use the time of parking to charge for the race.
In addition to the current common electromagnetic induction methods, the method of wireless charging also has a magnetic resonance method. The structure of the former is relatively simple, but the requirements for distance are high; the latter can achieve transmission over a long distance, and the charging during motion is estimated to depend on it, but the frequency needs to be protected. Either way, the cost of building a charging road is huge, and there are limits to the speed of the car.
Another application is charging during parking. The aforementioned Plugless L2 can only be single-to-one with wired charging, but in fact wireless charging can do one-to-many charging, also relying on magnetic resonance technology. This allows batch charging without the limitation of the charging post, as long as the power of the power supply is sufficient. All you have to worry about is that others are "squatting" like wifi.
Another problem is electromagnetic radiation. Many people talk about "radiation" discoloration. Even a cactus should be placed next to the computer. The kilowatt-level radiation source must be frightened. In fact, there is no need to worry at all. The so-called electromagnetic radiation is actually electromagnetic waves, and the ionizing radiation of α-ray γ-rays is very different. Sunlight is also an electromagnetic wave. Not to mention that the spatial frequency of this wireless transmission is not high, and almost no energy is dissipated into electromagnetic waves.
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