Wireless charging sending device, wireless charging system and wireless charging control method

The invention provides a wireless charging sending device, a wireless charging system and a charging control method thereof. The sending device comprises an emission coil used for emitting electricity energy of the sending device, an oscillating and frequency-modulating module used for enabling the emission coil to generate LC resonance and modulating the capacitance in the LC resonance so as to change the resonance frequency of the LC resonance, an emission end sampling module used for collecting voltage and currents of the sending device, a first control module used for controlling the resonance frequency of the LC resonance in the oscillating and frequency-modulating module and controlling the charging energy sending process according to the collected voltage and the collected currents of the sending device, the voltage of a receiving device and resonance frequency corresponding to the highest charging efficiency, a first communication module used for wireless communication between the sending device and the receiving device, and a power supply module. The sending device, the charging system and the charging control method can realize the adjustment of the resonance frequency of the LC resonance so as to have the advantage of improving the charging efficiency of the charging system.