A Voltage Converter And Method Of Converting Voltage

Abstract: We describe a converter for generating a multi-phase output voltage that uses a three-level converter having Upper pairs of switches (Upper and Mid-Lower) and Lower pairs of switches (Lower and Mid-Upper) arranged between positive and negative DC input voltages and an Intermediate DC voltage. A controller controls the Upper and Lower pairs of switches using PWM over a plurality of PWM periods to generate the multi-phase AC output voltages. For each PWM period, the controller controls the respective Upper or Lower pair of switches to apply respectively either a positive or a negative offset voltage simultaneously to each of the phase outputs, wherein the positive and negative offset voltages represent an average peak to peak voltage for the phase output voltage that is offset respectively positively or negatively from the intermediate DC voltage. Advantageously, conduction losses may be reduced when the intermediate DC voltage is not the same as the average phase voltage.

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