The principle of wireless charging:
1. Electromagnetic induction type
The alternating current of a certain frequency in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmitting end to the receiving end.
2. Magnetic field resonance
It consists of an energy transmitting device and an energy receiving device. When the two devices are adjusted to the same frequency, or resonate at a specific frequency, they can exchange energy with each other. This is a technology currently under study.
3. Radio wave
It is mainly composed of a microwave transmitting device and a microwave receiving device, which can capture the radio wave energy bounced from the wall, and maintain a stable DC voltage while making adjustments with the load. This method only needs a transmitter installed on the wall plug and a "mosquito-type" receiver that can be installed on any low-voltage product.