In modern life, we are increasingly inseparable from a variety of electronic products, such as mobile phones, tablets, laptops, etc., which greatly facilitates our daily life, but also brings us some troubles. You must have experienced such a situation. There are too many charging lines and too many kinds of charging lines. When you use them, you can't think of where they are placed. If you use other people's charging lines, you will find that they are not matched. Wireless charging technology can solve these problems very well, so how does it do it?

Wireless charging is the charging of powered devices by electromagnetic fields or electromagnetic waves without physical wire connections. At present, there are three mainstream technologies for wireless charging, electromagnetic induction, electromagnetic resonance and radio wave.

The first is electromagnetic induction. This method is similar to the high-transition transformer principle. Simply put, the transmitting coil is placed on one side of the system and the receiving coil is placed on the other side. When the transmitting coil is connected to the alternating current, the receiving coil generates an induced current due to Faraday's law of electromagnetic induction, thus achieving the purpose of wirelessly transmitting power.

Secondly, the electromagnetic resonance type. In the electromagnetic system, if two objects with the same vibration frequency are used as the transmitter and the receiver respectively, when they vibrate at the same frequency, the receiver can obtain energy from the electromagnetic field generated by the transmitter, and then Converted to current to power the device.

Finally, it is a radio wave type. This method requires an electromagnetic wave generator to be placed at the power source. The electromagnetic wave is transmitted through the transmitting antenna, and the receiving antenna at the other end receives the electromagnetic wave signal and then converted into electric energy for use by the electric device.

Although the above three wireless charging methods have their own magical powers, they also have certain defects. Electromagnetic induction type charging efficiency is very high, but the charging distance is very short, only a few millimeters, it is often necessary to close the appliance and the charging board; the electromagnetic resonance charging distance is farther than the inductive type, which can reach several centimeters to It is several tens of centimeters, but the charging efficiency is much lower than the former; the radio wave type has a long charging distance and can be transmitted within a few meters, but the electromagnetic wave emitted by it is easily interfered.