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

A device to-be-charged, comprising:

• a battery;
• a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging apparatus and convert the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit;
• a step-down circuit, configured to receive the output voltage of the wireless receiving circuit and decrease the output voltage of the wireless receiving circuit to charge the battery;
• a detecting circuit, configured to detect at least one of an output voltage and an output current of the step-down circuit;
• and
• a second control circuit, configured to communicate with the wireless charging apparatus according to at least one of the output voltage and the output current of the step-down circuit detected by the detecting circuit, whereby the wireless charging apparatus adjusts a transmission power of the electromagnetic signal to make a voltage difference between an input voltage of the step-down circuit and the output voltage of the step-down circuit meet a preset condition.

A method for wireless charging, being applicable to a device to-be-charged, the method comprising:

• receiving, with a wireless receiving circuit, an electromagnetic signal from a wireless charging apparatus and converting the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit;
• receiving, with a step-down circuit, the output voltage of the wireless receiving circuit and decreasing the output voltage of the wireless receiving circuit to charge a battery of the device to-be-charged;
• detecting at least one of an output voltage and an output current of the step-down circuit;
• and
• communicating with the wireless charging apparatus according to at least one of the output voltage and the output current of the step-down circuit detected, whereby the wireless charging apparatus adjusts a transmission power of the electromagnetic signal to make a voltage difference between an input voltage of the step-down circuit and the output voltage of the step-down circuit meet a preset condition.