Wirelessly charged electronic device, wireless charging method, and wireless charging system

A wireless charging system, comprising;

• an adapter;
• a transmit end comprising a wireless electric energy transmitter, a transmit coil, and a transmit end controller;
• and
• an electronic device comprising a receive coil, a wireless electric energy receiver, a charger, a controller, and a battery,
• wherein:
• the adapter is configured to convert an alternating current received from an alternating current power supply into a direct current and provide the direct current to the wireless electric energy transmitter;
• the wireless electric energy transmitter is configured to:
• invert the direct current provided by the adapter into an alternating current, and send the alternating current to the transmit coil;
• the transmit coil is configured to transmit, in a form of an alternating magnetic field, the alternating current received from the wireless electric energy transmitter;
• the transmit end controller is configured to:
• obtain power of the transmit end, and send the power of the transmit end to a controller of the electronic device;
• the receive coil of the electronic device is configured to:
• receive an alternating magnetic field transmitted by a transmit coil, and convert the alternating magnetic field into an alternating current;
• the wireless electric energy receiver is configured to convert the alternating current received from the receive coil into a direct current;
• an input end of the charger is connected to an output end of the wireless electric energy receiver, and an output end of the charger is connected to the battery and is configured to charge the battery after converting the direct current received from the wireless electric energy receiver;
• the charger comprises an open-loop DC-DC (direct current-to-direct current) converter and a closed-loop DC-DC converter, and the open-loop DC-DC converter is connected to the closed-loop DC-DC converter in series or in parallel;
• the controller is configured to:
• in response to power of a transmit end being greater than a first preset threshold of the transmit end and required charging power being greater than a first preset threshold of a receive end, control the open-loop DC-DC converter to work in a fast charging phase, which includes:
• controlling the open-loop DC-DC converter to work in a constant current step-down phase to charge the battery at a constant current, or
• controlling the open-loop DC-DC converter to work in a constant voltage step-down phase to charge the battery at a constant voltage;
• and
• the controller is further configured to:
• compare a charging parameter of the open-loop DC-DC converter with a target parameter to obtain a control parameter;
• and
• control, based on the control parameter, the open-loop DC-DC converter to work in the fast charging phase.