The principle of wireless charging is very simple. The principle of the famous electromagnetic induction is the basis of its theory. In a simple way, the current will produce magnetic field when the current flows through the coil, and the coil near the magnetic field will produce the induction current, thus realizing the wireless transmission of the current. The whole process is very simple. Like a transformer, the 22 coils are connected with a piece of iron, and the wireless charge turns the iron into the air, which makes the wireless charge. In contrast, the transmission medium is different, the efficiency will be very different, the magnetic field in the air, the loss of energy is very large, the solution is to increase the voltage and power, to achieve the centralized transmission of energy, thereby counteracting the energy loss in the air.