The invention relates to a power converter comprising, in particular, a rectifier comprising at least one switching leg provided with two transistors (T1-T6) connected in series. The transistors (T1-T6) are of the normally ON field-effect type, for example JFETs, and are each controlled by a gate control device (CT1-CT6). Each gate control device comprises, in particular: an output (OUT1) connected to the gate (G) of the controlled transistor, a voltage rectifier element connected between the output of the control device and an input (in1, in3) of the converter, a capacitor (C11) connected between the source (S) of the transistor and a point situated between the output of the control device and the voltage rectifier element.