WIRELESS CHARGING SYSTEM AND APPARATUS, AND TO-BE-CHARGED DEVICE

Embodiments of this application provide a wireless charging system and apparatus, and a to-be-charged device, to improve power conversion efficiency of wireless charging. In the wireless charging system provided in this application, a wireless charging apparatus obtains, in a charging period, channel information of a transmission channel and a waveform parameter used to indicate a waveform of an electromagnetic wave signal; generates a target electromagnetic wave signal based on the channel information and the waveform parameter; and sends the target electromagnetic wave signal to a to-be-charged device through the transmission channel. The channel information includes signal attenuation and a transmission delay that are of an electromagnetic wave signal transmitted through the transmission channel. The to-be-charged device converts the received target electromagnetic wave signal into a direct current signal, and performs charging based on the direct current signal. The target electromagnetic wave signal determined by the wireless charging apparatus can adapt to channel transmission, thereby improving power conversion efficiency of wireless charging. In addition, the channel information and structure information of the to-be-charged device do not need to be learned in advance, thereby improving practicality of a wireless charging method.