Power matching method and apparatus for wireless charging, and wireless charging apparatus

A power matching method for wireless charging, for a wireless transmitter in a wireless charging system, wherein a transmitting coil of the wireless transmitter comprises a capacitor assembly with adjustable capacitance and/or an inductor assembly with adjustable inductance, and the method comprises:

• receiving first sensing information sensed from the transmitting coil;
• detecting whether resonant frequency has changed according to the first sensing information;
• and
• adjusting at least one of capacitance of the capacitor assembly in the transmitting coil of the wireless transmitter and inductance of the inductor assembly in the transmitting coil in response to the resonant frequency changing to make transmitting power of the wireless transmitter be matched with receiving power of a wireless receiver in the wireless charging system;
• wherein the first sensing information comprises at least one of a first sensing voltage value and a first sensing current value;
• wherein the detecting whether the resonant frequency has changed according to the first sensing information comprises:
• determining whether the first sensing information is less than a preset feedback information threshold;
• and
• determining that the resonant frequency has changed in response to the first sensing information being less than the preset feedback information threshold;
• wherein the preset feedback information threshold is a voltage threshold in response to the first sensing information being the first sensing voltage value, and the preset feedback information threshold is a current threshold in response to the first sensing information being the first sensing current value.

A wireless charging apparatus, comprising a power matching apparatus for wireless charging, wherein the power matching apparatus for wireless charging is for a wireless transmitter and comprises:

• a transmitting coil, comprising at least one of a capacitor assembly with adjustable capacitance and an inductor assembly with adjustable inductance;
• and
• a controller electrically connected with the transmitting coil and being configured to receive first sensing information sensed from the transmitting coil, detect whether resonant frequency has changed according to the first sensing information, and adjust at least one of capacitance of the capacitor assembly with adjustable capacitance and inductance of the inductor assembly with adjustable inductance to make transmitting power of the wireless transmitter be matched with receiving power of a wireless receiver in response to the resonant frequency being changed, wherein the first sensing information comprises a first sensing voltage value or a first sensing current value;
• wherein the controller is configured to determine whether the first sensing information is less than a preset feedback information threshold, and determine that the resonant frequency has changed in response to the first sensing information being less than the preset feedback information threshold, the preset feedback information threshold is a voltage threshold in response to the first sensing information being the first sensing voltage value, and the preset feedback information threshold is a current threshold in response to the first sensing information being the first sensing current value.