Introduction: The device that uses the principle of electromagnetic induction for charging is similar to the principle of a transformer. A coil is placed at the sending and receiving ends. The sending coil sends an electromagnetic signal to the outside world under the action of electricity. The receiving coil receives the electromagnetic signal and converts it into current, thereby achieving the purpose of wireless charging. Wireless charging technology is a special power supply method that does not require a power cord, relies on electromagnetic wave propagation, and then converts electromagnetic wave energy into electrical energy, ultimately achieving wireless charging.