A power converter comprising: a generator (205, 250, 260 305, 405, 450, 460, 505, 605, 650, 660, 705,805, 850, 860) configured to generate a sequence of output voltage waveforms; a resonant tank (220, 215, 225, 240; 320, 340, 308, 315, 325; 410, 420, 425; 820, 815, 825) connected to the generator, the resonant tank comprising at least one capacitor (215, 225; 308, 315, 325; 410, 425; 815, 825) and at least one inductor (220, 320, 420, 820); a transformer (230, 630) including a primary side connected in series with said inductor, wherein the primary side is configured to use at least one primary winding tap (235; 335, 336) and a secondary side for connecting to a rectifying circuit (270, 280, 290; 470, 480, 490; 570, 580, 590; 670, 690; 870, 880) for providing a rectified DC voltage (V OUT) to an output load circuit; and a first switch (262, 362, 462, 562, 862) and a second switch (264, 364, 366, 464, 564, 864) on the primary side connected to a primary winding (240, 340) of the transformer, wherein the at least one primary winding tap is selected by the first switch or the second switch to select a different reflected output voltage (V RFL1, V RFL2, V RFL3) by closing the first switch or the second switch; the power converter being configured to selectively operate in at least a first mode of operation and a second mode of operation, wherein: in said first mode of operation, said first switch (262, 362, 462, 562, 862) is closed and said second switch (264, 364, 366, 464, 564, 864) is open, said at least one primary winding tap (235; 335, 336) being selected by the first switch, to select a first reflected output voltage (V RFL1); and in said second mode of operation, said first switch (262, 362, 462, 562, 862) is open and said second switch (264, 364, 366, 464, 564, 864) is closed, to select a second reflected output voltage (V RFL2, V RFL3), different from said first reflected output voltage (V RFL1). a generator (205, 250, 260 305, 405, 450, 460, 505, 605, 650, 660, 705,805, 850, 860) configured to generate a sequence of output voltage waveforms; a resonant tank (220, 215, 225, 240; 320, 340, 308, 315, 325; 410, 420, 425; 820, 815, 825) connected to the generator, the resonant tank comprising at least one capacitor (215, 225; 308, 315, 325; 410, 425; 815, 825) and at least one inductor (220, 320, 420, 820); a transformer (230, 630) including a primary side connected in series with said inductor, wherein the primary side is configured to use at least one primary winding tap (235; 335, 336) and a secondary side for connecting to a rectifying circuit (270, 280, 290; 470, 480, 490; 570, 580, 590; 670, 690; 870, 880) for providing a rectified DC voltage (V OUT) to an output load circuit; and a first switch (262, 362, 462, 562, 862) and a second switch (264, 364, 366, 464, 564, 864) on the primary side connected to a primary winding (240, 340) of the transformer, wherein the at least one primary winding tap is selected by the first switch or the second switch to select a different reflected output voltage (V RFL1, V RFL2, V RFL3) by closing the first switch or the second switch; the power converter being configured to selectively operate in at least a first mode of operation and a second mode of operation, wherein: in said first mode of operation, said first switch (262, 362, 462, 562, 862) is closed and said second switch (264, 364, 366, 464, 564, 864) is open, said at least one primary winding tap (235; 335, 336) being selected by the first switch, to select a first reflected output voltage (V RFL1); and in said second mode of operation, said first switch (262, 362, 462, 562, 862) is open and said second switch (264, 364, 366, 464, 564, 864) is closed, to select a second reflected output voltage (V RFL2, V RFL3), different from said first reflected output voltage (V RFL1). in said first mode of operation, said first switch (262, 362, 462, 562, 862) is closed and said second switch (264, 364, 366, 464, 564, 864) is open, said at least one primary winding tap (235; 335, 336) being selected by the first switch, to select a first reflected output voltage (V RFL1); and in said second mode of operation, said first switch (262, 362, 462, 562, 862) is open and said second switch (264, 364, 366, 464, 564, 864) is closed, to select a second reflected output voltage (V RFL2, V RFL3), different from said first reflected output voltage (V RFL1).