A forward type power converter circuit (100, 200, 300, 400, 500) comprising a ferrite-core forward type transformer having a first primary winding (Lpl) and at least one second primary winding (Lph1, Lph2) and at least one secondary winding (LsI, Ls2); one or more switching circuits for energizing the first primary winding (Lpl) and optionally the second primary winding (Lph1, Lph2), said switching circuits comprising at least two switching elements (Q1 to Q8) in each circuit; the circuits (100, 200, 300, 400, 500) further comprising: at least one automatic switching device (SWI, SW2) connected in series between the first primary winding (Lpl) and the second primary winding (Lph1, Lph2); a current sense circuit connected in series with the first primary winding (Lpl) and the automatic switching device (SW1, SW2); and a control unit being connected to the automatic switching device (SW1, SW2), the control unit being configured to operate the automatic switching device (SW1, SW2) based on an input voltage detected by the control unit in the input of the power converter circuit and a current through the current sense circuit, the control unit being connected to the two or more switching elements (Q1-Q8) of the switching circuit, the control unit being configured to operate the two or more switching elements (Q1-Q8) of the switching circuit, based on the current through the current sense circuit so as to ensure that the ferrite core of the transformer gets reset prior to operating the automatic switching device (SW1, SW2). a ferrite-core forward type transformer having a first primary winding (Lpl) and at least one second primary winding (Lph1, Lph2) and at least one secondary winding (LsI, Ls2); one or more switching circuits for energizing the first primary winding (Lpl) and optionally the second primary winding (Lph1, Lph2), said switching circuits comprising at least two switching elements (Q1 to Q8) in each circuit; the circuits (100, 200, 300, 400, 500) further comprising: at least one automatic switching device (SWI, SW2) connected in series between the first primary winding (Lpl) and the second primary winding (Lph1, Lph2); a current sense circuit connected in series with the first primary winding (Lpl) and the automatic switching device (SW1, SW2); and a control unit being connected to the automatic switching device (SW1, SW2), the control unit being configured to operate the automatic switching device (SW1, SW2) based on an input voltage detected by the control unit in the input of the power converter circuit and a current through the current sense circuit, the control unit being connected to the two or more switching elements (Q1-Q8) of the switching circuit, the control unit being configured to operate the two or more switching elements (Q1-Q8) of the switching circuit, based on the current through the current sense circuit so as to ensure that the ferrite core of the transformer gets reset prior to operating the automatic switching device (SW1, SW2). at least one automatic switching device (SWI, SW2) connected in series between the first primary winding (Lpl) and the second primary winding (Lph1, Lph2); a current sense circuit connected in series with the first primary winding (Lpl) and the automatic switching device (SW1, SW2); and a control unit being connected to the automatic switching device (SW1, SW2), the control unit being configured to operate the automatic switching device (SW1, SW2) based on an input voltage detected by the control unit in the input of the power converter circuit and a current through the current sense circuit, the control unit being connected to the two or more switching elements (Q1-Q8) of the switching circuit, the control unit being configured to operate the two or more switching elements (Q1-Q8) of the switching circuit, based on the current through the current sense circuit so as to ensure that the ferrite core of the transformer gets reset prior to operating the automatic switching device (SW1, SW2).