The current mainstream wireless charging principle for cell phones is electromagnetic induction wireless charging. A coil is built into the charging base and the cell phone terminal, so power is supplied from the charging base to the terminal when the two are close to each other.
It is through these principles and the built-in coil that the "wireless charging" function is realized. Advantages of wireless charging: more convenient, no need for a cell phone interface to achieve charging, eliminating the need for messy transmission lines between devices.
Safer, no exposed conductive interface, to avoid the risk of electric shock. Wireless charging charger is not only for cell phones. Many electronic devices can choose this convenient and safe charging method.