The wireless charger refers to a charger that does not require a charging power cord to be connected to a device that needs to be charged. It uses the latest wireless charging technology, and the inductive coupling technology will become a bridge connecting the charging base station and the device. The working principle of the wireless charger is a technology that applies the principle of electromagnetic wave induction and related AC induction technology to generate an induced AC signal at the transmitting and receiving ends with corresponding coils. In terms of its characteristics, the wireless charger technology is harmless to the safety of the human body, because its resonance principle is magnetic field resonance, which is transmitted only between coils that resonate at the same frequency, while other devices cannot accept the band.