Wireless Charger and Receiving Load of Backward Compatibility That Automatically Identifies Fast and Slow Charging

A wireless charger and receiving load of backward compatibility that automatically identifies fast and slow charging, wherein it comprises a wireless charger and a receiving load, the wireless charger comprises two-level variable DC voltage regulator circuit, a main resonant circuit, a resonant current sampling voltage divider and comparison circuit, the receiving load comprises a receiving resonant circuit, and the two-level variable DC regulator circuit is used for converting the AC input voltage of the power grid into a low-voltage or high-voltage two-level variable stable DC output voltage, the resonant current sampling voltage divider and comparison circuit is used for controlling the output voltage level of the two-level variable DC voltage regulator circuit, and the main resonant circuit adopts a sine wave resonant circuit to convert the DC energy into high-frequency alternating current energy and emits the magnetic field energy through the transmitting coil;

• the receiving resonant circuit receives the magnetic field energy, charges the rechargeable battery after passing the rectifier filter circuit of the post-stage and the CC/CV charging control circuit, compares the resonant frequency between wireless charger and receiving load, distinguishes different receiving load and realizes charging mode.