Wireless charging receiving device, wireless charging method and system, and terminal device

A wireless charging receiving device, comprising a control unit, a receiving coil, a rectifier-filter unit, a first voltage conversion unit, and a battery cell module, wherein

• the control unit is connected to the first voltage conversion unit and is configured to transmit a first control signal to a wireless charging transmitting device and output a second control signal to the first voltage conversion unit in a case that the wireless charging transmitting device is of a model belonging to a first preset model set and an output voltage of the battery cell module is within a preset range, wherein the first control signal is used for instructing the wireless charging transmitting device to transmit a first electromagnetic wave;
• the receiving coil is connected to the rectifier-filter unit and is configured to sense the first electromagnetic wave to generate a first alternating current (AC) and feed the first AC into the rectifier-filter unit;
• the rectifier-filter unit is configured to convert the first AC into a first direct current (DC) and feed the first DC into the first voltage conversion unit;
• the first voltage conversion unit is configured to convert the first DC into a second DC under the control of the second control signal and feed the second DC into the battery cell module, wherein a voltage at an end of the first voltage conversion unit connected to the battery cell module is greater than a voltage at an end of the first voltage conversion unit connected to the rectifier-filter unit, and is equal to the output voltage of the battery cell module;
• and
• the battery cell module is connected to a ground terminal and is charged by the second DC;
• wherein the wireless charging receiving device further comprises a second voltage conversion unit;
• the control unit is further configured to output a third control signal to the second voltage conversion unit in a case that the wireless charging transmitting device is of a model belonging to a second preset model set;
• the receiving coil is further configured to sense a second electromagnetic wave transmitted by the wireless charging transmitting device to generate a second AC and feed the second AC into the rectifier-filter unit;
• the rectifier-filter unit is further configured to convert the second AC into a third DC and feed the third DC into the second voltage conversion unit;
• the second voltage conversion unit is configured to convert the third DC into a fourth DC under the control of the third control signal and output the fourth DC to the battery cell module, wherein a voltage at an end of the second voltage conversion unit connected to the battery cell module is greater than a voltage at an end of the second voltage conversion unit connected to the rectifier-filter unit and is equal to a rated charging voltage of the battery cell module;
• and
• the battery cell module is further charged by the fourth DC.