Abstract: Disclosed is a charging case, comprising a control module, a charging case battery and a voltage conversion module; the charging case battery is connected with the voltage conversion module; the voltage conversion module is configured for converting a direct current output by the charging case battery into a charging voltage and outputting the charging voltage to a charging management chip of a to-be-charged device so as to charge a battery of the to-be-charged device through the charging management chip; the control module is configured to regulate the charging voltage output by the voltage conversion module according to a voltage of the battery of the to-be-charged device during charging of the battery of the to-be-charged device.

Abstract: Disclosed are a communication control method, apparatus and system, and a charging case and a wireless earphone. The method includes: acquiring, when a charging case is connected with a first wireless earphone though a first power supply pin and a second power supply pin, first to-be-transmitted data if the charging case is to communicate with the first wireless earphone; and controlling a first single-pole double-throw switch to connect the first power supply pin with a first TxRx and level conversion circuit, sequentially transmitting a predetermined start code and the first to-be-transmitted data to the first wireless earphone through the first power supply pin, where the first wireless earphone controls a first predetermined charging pin to be connected with a second TxRx and level conversion circuit based on the predetermined start code, and receives the first to-be-transmitted data.

Abstract: Disclosed is a charging case, comprising a control module, a charging case battery and a voltage conversion module; the charging case battery is connected with the voltage conversion module; the voltage conversion module is configured for converting a direct current output by the charging case battery into a charging voltage and outputting the charging voltage to a charging management chip of a to-be-charged device so as to charge a battery of the to-be-charged device through the charging management chip; the control module is configured to regulate the charging voltage output by the voltage conversion module according to a voltage of the battery of the to-be-charged device during charging of the battery of the to-be-charged device.

Abstract: Disclosed are a communication control method, apparatus and system, and a charging case and a wireless earphone. The method includes: acquiring, when a charging case is connected with a first wireless earphone though a first power supply pin and a second power supply pin, first to-be-transmitted data if the charging case is to communicate with the first wireless earphone; and controlling a first single-pole double-throw switch to connect the first power supply pin with a first TxRx and level conversion circuit, sequentially transmitting a predetermined start code and the first to-be-transmitted data to the first wireless earphone through the first power supply pin, where the first wireless earphone controls a first predetermined charging pin to be connected with a second TxRx and level conversion circuit based on the predetermined start code, and receives the first to-be-transmitted data.