Charger for an electrical accumulator battery for an electric motor vehicle, which is able to receive an AC voltage and to convert it into a DC voltage in order to recharge said battery, said charger comprising a power factor correction stage and a DC-to-DC conversion stage, said power factor correction stage comprising a Vienna rectifier comprising at least three bridge arms (31, 32, 33) each extending between two output terminals (P, N) of the power factor correction stage, each bridge arm (31, 32, 33) being able to be connected at a midpoint (310, 320, 330), via an inductor (311, 321, 331), to a phase (21, 22, 23) of an electric grid, said Vienna rectifier comprising, for each bridge arm (31, 32, 33), an assembly of controlled switches (34, 35, 36) which is connected, on the one hand, to the midpoint (310, 320, 330) of said corresponding bridge arm (31, 32, 33) and, on the other hand, at an output midpoint of the power factor correction stage; for each output terminal (P, N) of the power factor correction stage, an output capacitor (37, 38) is connected between said corresponding output terminal (P, N) and the output midpoint of the power factor correction stage, characterized in that at least two bridge arms (31, 32) of said Vienna rectifier each comprise a single bidirectional insulated-gate field-effect transistor (312, 322, 334) and a diode (313, 323, 333), connected on either side of the midpoint (310, 320) of the corresponding bridge arm (31, 32); and in that said DC-to-DC converter stage comprises two DC-to-DC conversion devices (41, 42), each being connected at its input in parallel with one of said output capacitors (37, 38) of the power factor correction stage and at the output to the terminals of said battery, in such a way that the charger is able to allow an electric current to flow from the battery to said electric grid and in that it comprises a first additional switch installed between said assemblies of controlled switches (34, 35, 36) and the output midpoint of the power factor correction stage, and a second additional switch connected between said assemblies of controlled switches (34, 35, 36) and an output terminal of the power factor correction stage, in such a way that, when the first additional switch is closed and the second additional switch is open, the charger is able to recharge the battery from the electric grid (2, 2') and, when the first additional switch is open and the second additional switch is closed, the charger is able to transfer the energy accumulated in the battery to the electric grid (2, 2') using the two DC-to-DC converters (41, 42) of the DC-to-DC conversion stage. each bridge arm (31, 32, 33) being able to be connected at a midpoint (310, 320, 330), via an inductor (311, 321, 331), to a phase (21, 22, 23) of an electric grid, said Vienna rectifier comprising, for each bridge arm (31, 32, 33), an assembly of controlled switches (34, 35, 36) which is connected, on the one hand, to the midpoint (310, 320, 330) of said corresponding bridge arm (31, 32, 33) and, on the other hand, at an output midpoint of the power factor correction stage; for each output terminal (P, N) of the power factor correction stage, an output capacitor (37, 38) is connected between said corresponding output terminal (P, N) and the output midpoint of the power factor correction stage, characterized in that at least two bridge arms (31, 32) of said Vienna rectifier each comprise a single bidirectional insulated-gate field-effect transistor (312, 322, 334) and a diode (313, 323, 333), connected on either side of the midpoint (310, 320) of the corresponding bridge arm (31, 32); and in that said DC-to-DC converter stage comprises two DC-to-DC conversion devices (41, 42), each being connected at its input in parallel with one of said output capacitors (37, 38) of the power factor correction stage and at the output to the terminals of said battery, in such a way that the charger is able to allow an electric current to flow from the battery to said electric grid and in that it comprises a first additional switch installed between said assemblies of controlled switches (34, 35, 36) and the output midpoint of the power factor correction stage, and a second additional switch connected between said assemblies of controlled switches (34, 35, 36) and an output terminal of the power factor correction stage, in such a way that, when the first additional switch is closed and the second additional switch is open, the charger is able to recharge the battery from the electric grid (2, 2') and, when the first additional switch is open and the second additional switch is closed, the charger is able to transfer the energy accumulated in the battery to the electric grid (2, 2') using the two DC-to-DC converters (41, 42) of the DC-to-DC conversion stage.