The past and present of wireless power supply: the technical exploration of wireless charging

The past and present of wireless power supply: the technical exploration of wireless charging

In Darwin ’s theory of evolution, from the perspective of statistics and biology, it reveals why humans have no tail. This evolution is defined as the beginning of higher intelligence. Although its accuracy is inconclusive, in the field of science and technology, telecommunications have no tail. In the silent transformation of the times, its technology has gone from the concept to the real world.

"How many people ridicule me for being a daydreamer. They are the stupidest people with the most stupid minds and the shortest eyesight. Let time talk."

-Nikola Tesla

The past and present of wireless power supply

The so-called wireless power supply or charging technology is simply to use electricity without wires, that is, the transmission of power is not conducted through wires, but in other ways. The important thing is to get rid of the last tail of wires.

Why is it the last tail? In the era known as the telecommunications era, all information technology and electrified equipment were initially transmitted through the connection of cables. The development of wireless data in recent years has allowed computers to get rid of redundant wired designs, but What can't be lost is the supply demand of the power cord, which is also a necessary condition since the birth of AC.

When it comes to wireless charging technology, perhaps many friends are very strange or feel incredible. In fact, the concept of wireless transmission itself is not new. As early as the 1890s, Ghost inventor and Tesla, the father of AC, came up with this idea-magnetic resonance can be used to transfer charge in the air between the charger and the device, and the coil and capacitor are A resonance is formed between the charger and the device, thereby achieving efficient transmission of electrical energy, and embarks on a method of transmitting power without wires.

In 1891, he successfully lit a light bulb without connecting wires, thus proving that wireless power transmission is not a fantasy. Based on the concept of Tesla, wireless charging technology has evolved a variety of research directions after years of development. At present, there are two major schools of electromagnetic induction and magnetic resonance. Among them, electromagnetic induction is currently the most common wireless charging solution.

Electromagnetic induction technology closest to us

Electromagnetic induction mainly uses the same principle as the transformer, and its implementation is not complicated. After the primary coil generates a certain frequency of alternating current, a certain current is generated in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the reception end.

Since the implementation of electromagnetic induction is not complicated, why is it so difficult to popularize wireless chargers using this type of technology? Simply put, the biggest obstacle is in the "transmission distance".

As we all know, even if the transmission power is transmitted through a metal line, a long distance will cause considerable line loss, not to mention the transmission through air-the maximum transmission distance is only about 10cm, which is a big deal for whether it can be used in a large range. Problems, but also need to consider many heat dissipation issues, such as heat between the coils.

However, the electromagnetic induction charging technology has the advantages of simple structure, low cost, and low electromagnetic radiation problems, and it is very easy to achieve product miniaturization. Because the power consumption of small digital devices usually does not exceed 100W, and the charging distance does not have too many requirements, most digital devices that support wireless charging mostly use electromagnetic induction solutions, such as wireless charging mobile phones, wireless charging pads, and charging pads. technology.

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