Abstract: A system includes a transformer having a multi-phase AC input and AC phase segment outputs. A plurality of rectifiers are each connected to receive AC input from a respective one of the AC phase segment outputs. Each rectifier has a respective positive DC output and a respective negative DC output. A first interphase transformer (IPT) with a respective winding is connected to each of the positive DC outputs of the plurality of rectifiers. The windings of the first IPT are connected to an output node of a positive DC power rail. A second IPT with a respective winding is connected to each of the negative DC outputs of the plurality of rectifiers. The windings of the second IPT are connected to an output node of a negative DC power rail. A power switch is operatively connected from the positive DC power rail to the negative DC power rail.

Abstract: An inverter system includes an inverter having a plurality of switching elements arranged with at least three levels, where the inverter is configured to receive a direct current input and output an alternating current to three phases. The inverter system also includes a controller configured to determine a reference voltage angle based on a first voltage and a second voltage that are orthogonal components of a reference voltage and determine a sector of a space vector map of the reference voltage based on the reference voltage angle. The controller is also configured to determine an active time pair of vector states associated with on-off states of the switching elements to modulate between based on the sector and the reference voltage angle and output a carrier waveform for each of the three phases to control modulation of the switching elements to achieve the reference voltage for the three phases.

Abstract: In accordance with at least one aspect of this disclosure, a method for pulse width modulation control includes resolving a reference vector for any number of active space vectors to determine a voltage offset for the reference vector, adding the voltage offset to each active vector to determine a modified modulated signal to be added to a carrier signal, and controlling, with a control module, a switching circuit based at least in part on the modified carrier signal.