First, electromagnetic induction
The charging base and the mobile phone terminal have built-in coils respectively. When the two are close, the transmitting coil generates a certain current in the mobile phone receiving coil based on a certain frequency of alternating current through electromagnetic induction, so as to transfer the point energy from the transmitting end to the receiving end, and then start to supply power to the mobile phone from the charging seat.
A magneto consists of a large inductor coil with a small capacitor in parallel or in series, and the same resonant frequency is a necessary condition for energy transfer. For example, two coils are used as resonators, the transmitting end vibrates at 10MHz to radiate an electromagnetic field around, and the receiving end needs to vibrate at 10MHz to receive this transmitted energy.
The principle is to convert the environmental electromagnetic wave into current and transmit the current through the circuit.