A device to be charged , comprising: a battery ; a wireless receiving circuit , configured to receive an electromagnetic signal transmitted by a wireless charging device and to convert the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit ; a step-down circuit , configured to receive the output voltage of the wireless receiving circuit and perform step-down processing on the output voltage of the wireless receiving circuit , for charging the battery ; a detection circuit , configured to detect a voltage and/or a current entering the battery ; a control circuit , configured to communicate with the wireless charging device based on the voltage and/or the current detected by the detection circuit , to enable the wireless charging device to adjust a transmitting power of the electromagnetic signal; a first charging channel ; and a second charging channel , wherein the control circuit is configured to when a first charging mode is adopted, control the step-down circuit on the first charging channel to operate, and when a second charging mode is adopted, control a conversion circuit on the second charging channel to operate, wherein the conversion circuit is configured to receive the output voltage and the output current of the wireless receiving circuit , and to charge the battery after performing constant voltage and/or constant current control on the output voltage and/or the output current of the wireless receiving circuit , characterized in that the device to be charged is configured to perform bidirectional communication with the wireless charging device to negotiate the charging mode to be adopted. a battery ; a wireless receiving circuit , configured to receive an electromagnetic signal transmitted by a wireless charging device and to convert the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit ; a step-down circuit , configured to receive the output voltage of the wireless receiving circuit and perform step-down processing on the output voltage of the wireless receiving circuit , for charging the battery ; a detection circuit , configured to detect a voltage and/or a current entering the battery ; a control circuit , configured to communicate with the wireless charging device based on the voltage and/or the current detected by the detection circuit , to enable the wireless charging device to adjust a transmitting power of the electromagnetic signal; a first charging channel ; and a second charging channel , wherein the control circuit is configured to when a first charging mode is adopted, control the step-down circuit on the first charging channel to operate, and when a second charging mode is adopted, control a conversion circuit on the second charging channel to operate, when a first charging mode is adopted, control the step-down circuit on the first charging channel to operate, and when a second charging mode is adopted, control a conversion circuit on the second charging channel to operate, wherein the conversion circuit is configured to receive the output voltage and the output current of the wireless receiving circuit , and to charge the battery after performing constant voltage and/or constant current control on the output voltage and/or the output current of the wireless receiving circuit , characterized in that the device to be charged is configured to perform bidirectional communication with the wireless charging device to negotiate the charging mode to be adopted. <EOS>