A charging circuit, being coupled between a charging port of a mobile terminal and a battery, comprises: a first circuit, coupled to the charging port, being configured to draw direct current, DC, power via the charging port from an electrical power source, and being configured to convert the direct current, DC, power signal flowing through the charging port to alternating current, AC, power signal; a second circuit, coupled to the battery, being configured to receive the AC power signal from the first circuit, and being configured to convert the AC power signal into DC power signal to charge the battery; a capacitance coupling component, coupled between the first circuit and the second circuit, being configured to pass the AC power signal but block the DC power signal flowing from the first circuit to the second circuit; wherein the capacitance coupling component is configured to couple the AC power signal from the first circuit to the second circuit when the first circuit is in a normal state and is configured to block off the DC power signal flowing through the charging port and the first circuit when the first circuit is in a fault state due to malfunction; wherein the first circuit comprises a bridge circuit (312, 314) and a control circuit (311, 313) configured to control the bridge circuit (312, 314), the bridge circuit (312, 314) is connected to the charging port and is configured to alternatively charge and discharge a capacitor of the capacitance coupling component under a control of the control circuit (311, 313) so as to convert DC output from the charging port and used for charging into AC, characterized in that a switch transistor having a low on-resistance is disposed in the bridge circuit (312, 314). a first circuit, coupled to the charging port, being configured to draw direct current, DC, power via the charging port from an electrical power source, and being configured to convert the direct current, DC, power signal flowing through the charging port to alternating current, AC, power signal; a second circuit, coupled to the battery, being configured to receive the AC power signal from the first circuit, and being configured to convert the AC power signal into DC power signal to charge the battery; a capacitance coupling component, coupled between the first circuit and the second circuit, being configured to pass the AC power signal but block the DC power signal flowing from the first circuit to the second circuit; wherein the capacitance coupling component is configured to couple the AC power signal from the first circuit to the second circuit when the first circuit is in a normal state and is configured to block off the DC power signal flowing through the charging port and the first circuit when the first circuit is in a fault state due to malfunction; wherein the first circuit comprises a bridge circuit (312, 314) and a control circuit (311, 313) configured to control the bridge circuit (312, 314), the bridge circuit (312, 314) is connected to the charging port and is configured to alternatively charge and discharge a capacitor of the capacitance coupling component under a control of the control circuit (311, 313) so as to convert DC output from the charging port and used for charging into AC, characterized in that a switch transistor having a low on-resistance is disposed in the bridge circuit (312, 314).