The use of wireless charging transmitter coils to wirelessly charge devices has become more and more popular. The principle of wireless charging is very simple, that is, the electric energy is converted into telecommunication magnetic waves at the radiating end and radiated out, and after the receiving end is exposed to the electromagnetic waves, it is converted. Chengdu electric energy, you may wish to charge. There are three implementation methods of wireless charging transmitter coil: electromagnetic induction type, wireless electromagnetic wave type and magnetic field resonance type, and the three methods also have their own characteristics.
Electromagnetic induction type, that is, using 2 wireless charging transmitter coils for wireless charging. When the alternating current in the output coil bursts, the magnetic field of the input coil will change accordingly, and then the induction alternating current will be produced, and the energy will be transferred from the output end. Converted to the input terminal. The use of electromagnetic induction requires that the distance between the two devices must be very close, and it can only be charged one-to-one, and the coil must be aimed at when charging. However, the energy conversion rate is high, and the transmission power range is large. , from a few watts to hundreds of watts.
Wireless electromagnetic wave type, that is, wireless charging through the wireless charging transmitter coil. However, the transmission power of this method is very small, the highest is only 100 mW, and the work efficiency is very low, and most of the energy will be abused in the form of wireless electromagnetic waves. .It has a slight advantage in transmission isolation, and the farthest isolation is 10 meters.
Magnetic field resonance type, that is, charging wirelessly by means of electric nuclear magnetic resonance. The principle is consistent with sound wave resonance. Only two media have the resonance frequency of communication, so it is possible to transmit energy. This method of charging is isolated from electromagnetic induction and wireless electromagnetic waves. Among the modes, the advantage is that the transmission power is relatively large, it may reach several kilowatts, it may be possible to charge multiple devices at the same time, and the coil correspondence between the two devices is not required; The larger the cost, the greater the cost. The most annoying thing is that the frequency band used must be protected.