Abstract: In order to solve the problem of the large number of desktop devices and the complicated charging connection, a wireless power supply device based on magnetic resonance technology is designed, which mainly includes transmitting coil, transmitting circuit, receiving coil and receiving circuit. The natural resonant frequency of the transmitting coil is consistent with that of the receiving coil. TMS320F28335 chip of TI company is used to control 4-channel SiC MOS to provide inverter power. The receiving end uses a rectifier DC/DC circuit composed of a power chip GS3671 to convert the AC power output from the receiving coil into a stable DC power supply that can be used by the load. Through the tests of different coil diameters, distances and relative positions, the receiving coil designed can stably drive the load within the range of 0~15 cm from the desktop, and ensure a transmission efficiency of more than 80%.

Key words: Magnetic resonance technology, Wireless power transmission, Series resonance