Generally in 0.9 1.2 meters up to 5 m high power transmission distance of wireless charging wireless charging technology can be divided into low power wireless charging and high power wireless charging in two ways. Low power wireless charging often USES electromagnetic induction type, such as the mobile phone charging way of Qi, but zte's electric cars using the inductive wireless charging. High-power wireless charging usually adopts a resonant mode (most electric vehicle charging uses this mode) by the power supply device (charger) to transmit energy to the electric device, which uses the received energy to charge the battery, and at the same time for its own operation. Because of the energy between the charger and power device to transmit field, without wires, between so charger and electric device can do no conductive contact the leakage.