The invention provides an anti-
backflow current charger, which comprises an
electric energy conversion circuit and a protection circuit, the protection circuit comprises a first switch, a second switch and a
comparator, the first switch is connected in series with the output end of the
electric energy conversion circuit, the input end of the
comparator detects the current flowing through the first switch, and the output end of the
comparator detects the current flowing through the second switch. The output end of the comparator is connected with the control end of the second switch, and when the current direction is reversed, the comparator controls the second switch to be switched on, the second switch enables the gate-source
electrode of the first switch to be in
short circuit, and the first switch is switched off. The anti-
backflow current switching circuit provided by the invention can quickly respond, quickly turn off the switch at the output end of the charger,
cut off the path of the
backflow current flowing to the charger, and limit the magnitude of the backflow current within an acceptable range.