Device To-Be-Charged, Wireless Charging Apparatus, and Wireless Charging Method

A wireless charging apparatus includes a voltage converting circuit, a wireless transmitting circuit, and a first control circuit. The voltage converting circuit is configured to receive an input voltage and convert the input voltage to obtain an output voltage and an output current of the voltage converting circuit. The wireless transmitting circuit is configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage converting circuit to conduct wireless charging on a device to-be-charged. The first control circuit is configured for wireless communication with the device to-be-charged during the wireless charging to acquire battery information of the device to-be-charged and configured to adjust, according to the battery information of the device to-be-charged, a resonant frequency of the wireless transmitting circuit to adjust a transmission power of the wireless transmitting circuit. A device to-be-charged, method and system are also provided.