VEHICLE CHARGER COMPRISING A DC/DC CONVERTER

The invention concerns a battery charger (400) installed on a vehicle, comprising: - a main voltage converter comprising: - at least one transformer (TF) comprising at least one primary side and at least one secondary side, - at least one upstream bridge of controlled transistors supplying the primary side of the transformer (TF), - at least one downstream bridge (PR3) of controlled transistors supplied by the secondary side of the transformer, making it possible, when current- and/or voltage-controlled, to generate a first voltage for supplying a battery to be charged, the downstream bridge comprising, in particular, at least a first leg (Leg1) and a second leg (Leg2), - at least one isolating switch (TR) linked, in particular directly, to a mid-point (T2) of one of the legs of the downstream bridge, in particular the second leg (Leg2) of the downstream bridge, making it possible, when open, to use the downstream bridge to deliver the first voltage and, when closed, to use at least one of the legs of the downstream bridge, in particular the first leg (Leg1) of the downstream bridge, to generate a second voltage, different to the first voltage, by controlling all or some of the transistors of the downstream bridge supplied by said battery, and - a circuit for controlling the transistors (410).