Reverse current switch, wherein the reverse current switch comprises: a comparison unit comprising a first input end (125/225), a second input end (126/226), and a first output end (127/227); and a switch resistance unit (110/210), wherein a first end of the switch resistance unit (110/210) is connected to the first input end (125/225), a second end of the switch resistance unit (110/210) is connected to the second input end (126/226), and a third end of the switch resistance unit (110/210) is connected to the first output end (127/227), and the switch resistance unit (110/210) is controlled by a voltage of the first output end (127/227), wherein the reverse current switch is configured such that, when a voltage of the first input end (125/225) is greater than a voltage of the second input end (126/226), the voltage of the first output end (127/227) is configured to control the switch resistance unit (110/210) to be in an on state, or when a voltage of the first input end (125/225) is less than a voltage of the second input end (126/226), the voltage of the first output end (127/227) is configured to control the switch resistance unit (110/210) to be in an off state; characterised in that the reverse current switch further comprises: a voltage controlled unit comprising a voltage controlled resistance unit (131/231) and a voltage controlled voltage generation unit, wherein the voltage controlled resistance unit and the switch resistance unit (110/210) are connected in series between the first input end (125/225) and the second input end (126/226), and voltage controlled voltage generation unit comprises a second output end (134/234), wherein the reverse current switch is configured such that, when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) increases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to decrease, or when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) decreases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to increase. a comparison unit comprising a first input end (125/225), a second input end (126/226), and a first output end (127/227); and a switch resistance unit (110/210), wherein a first end of the switch resistance unit (110/210) is connected to the first input end (125/225), a second end of the switch resistance unit (110/210) is connected to the second input end (126/226), and a third end of the switch resistance unit (110/210) is connected to the first output end (127/227), and the switch resistance unit (110/210) is controlled by a voltage of the first output end (127/227), wherein the reverse current switch is configured such that, when a voltage of the first input end (125/225) is greater than a voltage of the second input end (126/226), the voltage of the first output end (127/227) is configured to control the switch resistance unit (110/210) to be in an on state, or when a voltage of the first input end (125/225) is less than a voltage of the second input end (126/226), the voltage of the first output end (127/227) is configured to control the switch resistance unit (110/210) to be in an off state; characterised in that the reverse current switch further comprises: a voltage controlled unit comprising a voltage controlled resistance unit (131/231) and a voltage controlled voltage generation unit, wherein the voltage controlled resistance unit and the switch resistance unit (110/210) are connected in series between the first input end (125/225) and the second input end (126/226), and voltage controlled voltage generation unit comprises a second output end (134/234), wherein the reverse current switch is configured such that, when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) increases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to decrease, or when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) decreases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to increase. a voltage controlled unit comprising a voltage controlled resistance unit (131/231) and a voltage controlled voltage generation unit, wherein the voltage controlled resistance unit and the switch resistance unit (110/210) are connected in series between the first input end (125/225) and the second input end (126/226), and voltage controlled voltage generation unit comprises a second output end (134/234), wherein the reverse current switch is configured such that, when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) increases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to decrease, or when a difference between the voltage of the first input end (125/225) and the voltage of the second input end (126/226) decreases, a voltage of the second output end (134/234) is configured to control a resistance value of the voltage controlled resistance unit (131/231) to increase.