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How far is the wireless charger solution from us?



How far is the wireless charger solution from us?


How far is the wireless charging scheme from us?

At the end of the 20th century, various rechargeable electronic devices became popular and electromagnetic induction theory was applied to the charging technology. Now, it is the turn of the electric car that becomes popular. Can any new development of wireless charging technology be possible?

In 1831, Faraday discovered the phenomenon of electromagnetic induction with two coils, let us know that even without a wire, you can let the current flow through the obstacles of space. At the end of the 20th century, various rechargeable electronic devices became popular and electromagnetic induction theory was applied to the charging technology. Now, it is the turn of the electric car that becomes popular. Can any new development of wireless charging technology be possible?

The earliest product that used wireless charging technology was an electric toothbrush, which appeared in the 1990s and could be charged after being used by inserting it on a special base. This technology is now widely used in portable electronic devices such as mobile phones and tablets. Then can electric cars that need to be recharged use wireless charging?

In fact, the history of wireless charging for vehicles is as long as electric toothbrushes. Wireless charging technology for vehicles appeared in the 1990s and was developed by General Motors and its subsidiary Delco. However, the first ETL certified and promoted application is the Evatran's Plugless L2 system, which is already in the Chevrolet Volt and Nissan. Leaf installed on use. However, these wireless charging schemes and charging piles are actually of a nature. A mat is laid on the ground, and there is a collector on the car, which can be recharged when parked on it. It only saves the effort of plugging in and unplugging the interface.

One aspect is to extend wireless charging points from home to the road. There are already several wireless charging roads in trial operation, but the object of charging is buses. For example, South Korea has built a 12-kilometer long wireless charging bus line in 2013, and similar bus operations have been carried out in countries including Germany and Italy including China. In addition to the wireless charging road, it is more common to have a bus station and a taxi stop with wireless charging points, and use this period of time for parking to “charge for seconds” to charge.

In addition to the common electromagnetic induction methods, there are magnetic resonance methods. The structure of the former is relatively simple, but the requirement for distance is higher; the latter can achieve transmission over longer distances, and the charge during motion estimation is dependent on it, but the frequency needs to be protected. However, regardless of the method, the cost of building a charging road is huge, and there are also restrictions on the speed of the vehicle.


Another application is charging while parking. The aforementioned Plugless L2 can only be single-on-line with wired charging, but in fact, wireless charging can be used for one-to-many charging, also relying on magnetic resonance technology. In this way, batch charging can be performed without limitation of the charging pile, as long as the power of the power supply is sufficient. All you have to worry about is someone else who likes to "save electricity."

Another problem is electromagnetic radiation. Many people talk about the “spoke” color change. Even a cactus should be placed next to the computer. This kind of kilowatt-level radiation source must be frightened. In fact, there is no need to worry about it. The so-called electromagnetic radiation is actually an electromagnetic wave. There is a stark contrast to the ionizing radiation of alpha rays and gamma rays. The sunlight is also an electromagnetic wave. Not to mention that the space frequency of this wireless transmission is not high, and there is almost no energy dissipation as electromagnetic waves.