A converter comprising: an input configured to receive an input DC voltage having an input voltage value; an output; a first voltage bus; a first midpoint; a first transformer having a primary and a secondary; a first circuit coupled to the input, coupled between the first midpoint and the first voltage bus and coupled to the primary of the first transformer, the first circuit including a first switching leg coupled between the first voltage bus and the first midpoint, and a second switching leg coupled between the first voltage bus and the first midpoint, the first switching leg being a first positive half-bridge that includes a first pair of series coupled transistors (216, 218), and the second switching leg being a second positive half-bridge that includes a second pair of series coupled transistors (220, 222); a second midpoint between the first pair of series coupled transistors (216, 218) of the first positive half bridge, the second midpoint being coupled to a first side of the primary of the first transformer, and a third midpoint between the second pair of series coupled transistors (220, 222) of the second positive half bridge, the third midpoint being coupled to a second side of the primary of the first transformer; an output circuit coupled to the secondary of the first transformer and coupled to the output; and a control circuit coupled to the first circuit and configured to control the first circuit to provide an AC voltage at the primary of the first transformer, wherein the control circuit is configured to control the transistors (216, 218) of the first switching leg using a first modified triangular waveform by first pulse width modulation, PWM, control signals and to control the transistors (220, 222) of the second switching leg using a second modified triangular waveform by second PWM control signals, the first and second PWM control signals having a duty cycle; wherein the first modified triangular waveform and the second modified triangular waveform do not follow a triangular shape over a complete cycle of the waveform, wherein each of the first modified triangular waveform and the second modified triangular waveform has areas of infinite slope and areas where the slope is half of that of a triangular waveform, wherein the first and second modified triangular waveforms provide a phase shift between the first switching leg and the second switching leg when the duty cycle is 0.5, and wherein the control circuit is configured to vary the phase shift as a function of the duty-cycle, such that the AC voltage at the primary of the first transformer appears as a 3-level waveform with the same amplitude and duty-cycle for any input voltage rather than a 2-level waveform at a duty cycle of 0.5. an input configured to receive an input DC voltage having an input voltage value; an output; a first voltage bus; a first midpoint; a first transformer having a primary and a secondary; a first circuit coupled to the input, coupled between the first midpoint and the first voltage bus and coupled to the primary of the first transformer, the first circuit including a first switching leg coupled between the first voltage bus and the first midpoint, and a second switching leg coupled between the first voltage bus and the first midpoint, the first switching leg being a first positive half-bridge that includes a first pair of series coupled transistors (216, 218), and the second switching leg being a second positive half-bridge that includes a second pair of series coupled transistors (220, 222); a second midpoint between the first pair of series coupled transistors (216, 218) of the first positive half bridge, the second midpoint being coupled to a first side of the primary of the first transformer, and a third midpoint between the second pair of series coupled transistors (220, 222) of the second positive half bridge, the third midpoint being coupled to a second side of the primary of the first transformer; an output circuit coupled to the secondary of the first transformer and coupled to the output; and a control circuit coupled to the first circuit and configured to control the first circuit to provide an AC voltage at the primary of the first transformer, wherein the control circuit is configured to control the transistors (216, 218) of the first switching leg using a first modified triangular waveform by first pulse width modulation, PWM, control signals and to control the transistors (220, 222) of the second switching leg using a second modified triangular waveform by second PWM control signals, the first and second PWM control signals having a duty cycle; wherein the first modified triangular waveform and the second modified triangular waveform do not follow a triangular shape over a complete cycle of the waveform, wherein each of the first modified triangular waveform and the second modified triangular waveform has areas of infinite slope and areas where the slope is half of that of a triangular waveform, wherein the first and second modified triangular waveforms provide a phase shift between the first switching leg and the second switching leg when the duty cycle is 0.5, and wherein the control circuit is configured to vary the phase shift as a function of the duty-cycle, such that the AC voltage at the primary of the first transformer appears as a 3-level waveform with the same amplitude and duty-cycle for any input voltage rather than a 2-level waveform at a duty cycle of 0.5.