Xiaomi car wireless charger uses wireless charging technology to transfer electric energy to the phone through electromagnetic induction to achieve charging. The interior is mainly composed of a charging base, a receiving coil, a control circuit and a cooling device. When the mobile phone is placed on the charging base, the receiving coil generates current through electromagnetic induction, the control circuit controls the size and frequency of the current, and the heat generated is dissipated through the cooling device, so as to achieve the effect of wireless charging for the mobile phone.