Wireless charging module, control circuit, and electronic device

A control circuit for a wireless charging module, wherein the wireless charging module is configured to receive an alternating magnetic field provided by a wireless power supply device, the wireless charging module comprises the control circuit, a charging coil, a tunable capacitor module, and a rectifier circuit, the charging coil is configured to receive the alternating magnetic field, the tunable capacitor module is connected in series between the charging coil and the rectifier circuit, the tunable capacitor module comprises a plurality of capacitors and at least one controllable switch,

• wherein the control circuit is configured to:
• control the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module, wherein the equivalent capacitance value of the tunable capacitor module comprises one of a first capacitance value or a second capacitance value;
• when the wireless power supply device runs in a constant-voltage frequency-regulation mode, control the equivalent capacitance value of the tunable capacitor module to be equal to the first capacitance value;
• or
• when the wireless power supply device runs in a constant-frequency voltage-regulation mode, control the equivalent capacitance value of the tunable capacitor module to be equal to or less than the second capacitance value and greater than the first capacitance value;
• and
• control, based on an induced voltage of the charging coil, the rectifier circuit to run in a half-bridge voltage-multiplying rectification mode or a full-bridge rectification mode.

An electronic device comprising a wireless charging module, wherein the wireless charging module is configured to receive an alternating magnetic field generated by a wireless power supply device, and wherein:

• the wireless charging module comprises a control circuit, a charging coil, a tunable capacitor module, and a rectifier circuit;
• the tunable capacitor module is connected in series between the charging coil and the rectifier circuit;
• the tunable capacitor module comprises a plurality of capacitors and at least one controllable switch;
• the charging coil is configured to receive the alternating magnetic field generated by the wireless power supply device and output an alternating current;
• the rectifier circuit is configured to convert the alternating current into a direct current;
• the electronic device is configured such that:
• when the wireless power supply device runs in a constant-frequency voltage-regulation mode, the control circuit is configured to control one or more of the at least one controllable switch to be turned off;
• or
• when the wireless power supply device runs in a constant-voltage frequency-regulation mode, the control circuit is configured to control all the at least one controllable switch to be turned on;
• and
• the control circuit is configured to:
• control the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module, wherein the equivalent capacitance value of the tunable capacitor module comprises one of a first capacitance value or a second capacitance value;
• and
• control, based on an induced voltage of the charging coil, the rectifier circuit to run in a half-bridge voltage-multiplying rectification mode or a full-bridge rectification mode.