Unipolar or bipolar chopping converter with two magnetically coupled windings

A chopping converter supplied by a positive voltage (Vp) and a negative voltage (Vm) with respect to ground, and delivering an output voltage between a first output terminal (SP) and a second output terminal (SM), the latter terminal being connected directly to ground or through a resistor, comprising two windings (Ls, Lp) wound in opposition around a magnetic core, the number of turns of the second winding (Lp) being greater than the number of turns of the first winding (Ls), the first end of the first winding (Ls) being connected to a mid point of a first branch connecting the positive voltage (Vp) to the negative voltage (Vm) and comprising a first diode (D1) and a second diode (D2) inversely mounted, the mid point of the first branch being situated between the first diode (D1) and the second diode (D2), the second end of the first winding (Ls) being connected to ground, the first end of the second winding (Lp) being connected to a mid point of a second branch connecting the positive voltage (Vp) to the negative voltage (Vm), the part of the second branch connecting its mid point to the positive voltage (Vp) comprising, arranged in series, a first switch forming means (Q1) and a third diode (D3) directly mounted in relation to the positive voltage (Vp) and together forming a unidirectional switch with direct and inverse blocking capability, the part of the second branch connecting its mid point to the negative voltage (Vm) comprising, arranged in series, a second switch forming means (Q2) and a fourth diode (D4) directly mounted in relation to the negative voltage (Vm) and together forming a unidirectional switch with direct and inverse blocking capability, the second end of the second winding (Lp) being connected to the output terminal (S).