Planar wireless charging transmitter based on repeating coil

The invention provides a planar wireless charging transmitter based on a repeating coil. The transmitter comprises an inverter circuit, the inverter circuit is used for converting a direct-current power supply into a high-frequency alternating current and then accessing the high-frequency alternating current into a source coil and a source coil compensation network, and is characterized by further comprising the source coil, the source coil compensation network, the repeating coil and a repeating coil compensation network. The source coil compensation network and the relay coil compensation network are respectively used for eliminating reactive power caused by the source coil and self-inductance. According to the scheme based on the planar wireless charging transmitter, the relay coil capable of being put in/cut out is adopted, and when the center position of a receiver is aligned with the center position of the source coil or the offset is small, the relay coil is cut out; on the contrary, when the offset is