Three-coil battery wireless charging system adaptive to battery charging curve

The invention discloses a three-coil battery wireless charging system adaptive to a battery charging curve. The three-coil battery wireless charging system comprises a three-coil transformer, a direct-current power supply, a high-frequency inverter, a primary side compensation capacitor, a secondary side compensation capacitor, a battery, a secondary side rectifier bridge, an additional side rectifier bridge, an additional loop compensation topology and an additional compensation capacitor. According to the wireless charging system, the working frequency of the system and parameter values of additional loop compensation topology are reasonably designed, three coil loops are constructed, constant current output is obtained by adjusting the working frequency, and the primary side compensation capacitance and the secondary side compensation capacitance are determined according to the set working frequency; additional loop compensation parameters are determined according to the size of a constant voltage threshold value needed by a rechargeable battery, constant current-constant voltage self-adaptive switching and flexible adjustment of an output threshold value are achieved, constant current-constant voltage self-adaptive switching needed by the battery is achieved through three coil loops, complex control and frequency switching are not needed. The communication fault problem possibly caused by complex control and instability caused by frequency switching are avoided.