Ac / dc converter including a rectifier circuit connected in series with a primary winding (5) of an isolating transformer (6) and to a switch (t1) controlled by a control circuit (10) by pulse width modulation on the basis of a signal representative of a primary current, the isolating transformer comprising a first secondary winding (7), the direction of which is identical to the primary winding and which is connected to an output line (8) of the converter via a diode (d4) and a coil of the filtering (l1), and a second secondary winding (9) which has a direction opposite to the primary winding and which is connected directly to the output line via a diode (d2), the output line being connected to an output capacitor cout (). The converter comprises an analog circuit for correcting the primary current, which is connected to the control circuit and to a measuring element (30) supplying a signal representative of the primary current, and which is arranged to convert the signal in a triangular signal adapted to the control of the control circuit.
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