WIRELESS POWER RECEIVING DEVICE, WIRELESS CHARGING METHOD AND SYSTEM

A wireless power receiving device includes: a wireless power receiving coil, an AC-DC circuit, a capacitor buck circuit, and a battery, wherein the capacitor buck circuit includes at least two capacitors and a switch; an output terminal of the wireless power receiving coil is connected to an input terminal of the AC-DC circuit, and an output terminal of the AC-DC circuit is connected to an input terminal of the capacitor buck circuit, and an output terminal of the capacitor buck circuit is connected to the battery; in a case that the switch is in a first connection state, the at least two capacitors are in a series state and store energy; and in a case that the switch is in a second connection state, the at least two capacitors are in a parallel state and release energy.