At present, there are four types of wireless charging technology. Among the four kinds of wireless charging methods, electromagnetic induction wireless charging is the most mature one. It is also the most widely used one in commerce. For example, all kinds of wireless chargers we need for mobile phones are based on this technology. As far as the current technology level is concerned, the electromagnetic induction wireless charging scheme is the most worthwhile one. It also provides a wireless charging solution for smartphones, which still has more advantages than disadvantages. Moreover, while improving the convenience of charging, it also unifies all kinds of chargers to a certain extent and reduces the waste of resources. Two other technologies are also developing.
Radio wave charging is a mature wireless charging technology, which has many wireless charging applications. The radio charger charged by radio wave consists of microwave transmitting device and microwave receiving device. It can capture the energy of radio wave bounced back from the wall and maintain stable DC voltage while adjusting the load. This wireless charging method is more convenient. Just install a transmitter at the wall plug and a receiver on the low voltage product. We currently supply built in wireless charger, which can be installed in furniture.
Its advantage is that the transmission interval is medium and the transmission speed is faster, but its disadvantage is that the stability and security are relatively low, and it needs a certain cost to invest in research and development.
This method can be seen as a resonant enhanced version. It needs to transmit and receive two resonant systems, which can be made of induction coils respectively. By adjusting the transmitting frequency to make the transmitter vibrate at a certain frequency, it produces a non-radiating magnetic field instead of a common electromagnetic wave which is diffused everywhere. That is, the electric energy is converted into a magnetic field and an energy channel is formed between the two coils. The natural frequency of the receiver is the same as that of the transmitter, so resonance occurs. With each resonance, more voltage will be generated in the receiver inductor. After multiple resonances, the surface of the inductor will gather enough energy, so that the receiving end receives energy in this non-radiating magnetic field, thus completing the conversion of magnetic energy to electric energy and realizing the wireless transmission of electric energy.
Electric field coupled charging is suitable for short-distance charging, and has high conversion efficiency and can not be fixed in position. However, the disadvantage is that large volume of equipment and small power is needed.