A voltage converter circuit (100;300;1100) comprising: a transformer (110;310;1110) comprising at least one primary winding (112;312;1112;L3) and at least one secondary winding (114;314;1114;15) and a second secondary winding (116;316;1116;L6), a capacitor (120;320;1130;C5), and a rectifier arrangement (150, 154a-154f; 350,354a-354f;1150; D1, D2, D3, D4, D5, D6); wherein the capacitor is connected in series to the first secondary winding so as to form a resonant circuit (114,120;314,320; 1130), wherein a first terminal of the resonant circuit, a tap (140;340;1140) coupled to a second terminal of the resonant circuit and to a first terminal of the second secondary winding, and a second terminal of the second secondary winding are coupled to the rectifier arrangement, and wherein the rectifier arrangement is configured to enable a current flow to a load node (152a;352a;1160) as a function of voltages (V Leg12,V Leg13,V Leg23) present across the resonant circuit and across the second secondary winding and across a series connection of the resonant circuit and of the second secondary winding; characterized in that: the voltage converter circuit is configured, for example by means of a suitable choice of the turns ratios of the secondary windings and by means of a suitable choice of the capacitor, such that when a first output voltage is present between two load nodes (152a,152b;352a,352b;1150,1162), a current flow to one of the load nodes takes place, apart from zero crossings, through the resonant circuit (114,120;314,320; 1130) during an entire period of excitation, and when a second output voltage, smaller than the first output voltage, is present between the load nodes, a current flow to one of the load nodes flows only through the second one of the secondary windings during at least 40% of a period of excitation, or through one of the secondary windings during at least 50% of a period of excitation, or when a first output voltage is present between two load nodes, a current flow to one of the load nodes flows through a series connection of the resonant circuit and of the second secondary winding during more than 50% of a period of excitation, and when a second output voltage, smaller than the first output voltage, is present between the load nodes, a current flow flows through the series connection of the resonant circuit and of the second secondary winding during at the most 30% of a period of excitation. a transformer (110;310;1110) comprising at least one primary winding (112;312;1112;L3) and at least one secondary winding (114;314;1114;15) and a second secondary winding (116;316;1116;L6), a capacitor (120;320;1130;C5), and a rectifier arrangement (150, 154a-154f; 350,354a-354f;1150; D1, D2, D3, D4, D5, D6); wherein the capacitor is connected in series to the first secondary winding so as to form a resonant circuit (114,120;314,320; 1130), wherein a first terminal of the resonant circuit, a tap (140;340;1140) coupled to a second terminal of the resonant circuit and to a first terminal of the second secondary winding, and a second terminal of the second secondary winding are coupled to the rectifier arrangement, and wherein the rectifier arrangement is configured to enable a current flow to a load node (152a;352a;1160) as a function of voltages (V Leg12,V Leg13,V Leg23) present across the resonant circuit and across the second secondary winding and across a series connection of the resonant circuit and of the second secondary winding; the voltage converter circuit is configured, for example by means of a suitable choice of the turns ratios of the secondary windings and by means of a suitable choice of the capacitor, such that when a first output voltage is present between two load nodes (152a,152b;352a,352b;1150,1162), a current flow to one of the load nodes takes place, apart from zero crossings, through the resonant circuit (114,120;314,320; 1130) during an entire period of excitation, and when a second output voltage, smaller than the first output voltage, is present between the load nodes, a current flow to one of the load nodes flows only through the second one of the secondary windings during at least 40% of a period of excitation, or through one of the secondary windings during at least 50% of a period of excitation, or when a first output voltage is present between two load nodes, a current flow to one of the load nodes flows through a series connection of the resonant circuit and of the second secondary winding during more than 50% of a period of excitation, and when a second output voltage, smaller than the first output voltage, is present between the load nodes, a current flow flows through the series connection of the resonant circuit and of the second secondary winding during at the most 30% of a period of excitation.