In the field of wireless charging, there are mainly two alliances: WPC and Airfuel. The technical research directions are divided into magnetic induction and magnetic resonance, and each technology research direction corresponds to different application scenarios.

Magnetic resonance wireless charging can be seen as an enhanced version of magnetic induction, which requires two resonance systems to transmit and receive, each made of induction coils. By adjusting the transmission frequency to make the transmitting end vibrate at a certain frequency, it produces not ordinary electromagnetic waves that diffuse everywhere, but a non radiative magnetic field that converts electrical energy into a magnetic field, forming an energy channel between two coils. The natural frequency of the receiving end is the same as the frequency of the transmitting end, resulting in resonance. With each resonance, more voltage is generated in the receiving end sensor. After generating multiple resonances, the surface of the sensor will accumulate enough energy, so that the receiving end receives energy in this non radiative magnetic field, completing the conversion of magnetic energy to electrical energy and achieving wireless transmission of electrical energy.

The biggest advantage of magnetic resonance compared to magnetic induction is that it has a higher tolerance in distance and can support wireless charging ranging from centimeters to meters; And the electromagnetic resonance method can also charge multiple devices simultaneously, and there is no strict restriction on the location of the devices. The flexibility of use ranks first among various technologies, and it is a key development direction for future wireless charging.