Patent ID: 8315071

Claim:
A light-weight composite 24-pulse AC-to-DC converter with optimal power quality comprising: a main rectifier connected directly to receive a three phase input AC waveform, the direct connection being formed by phase conductors interposed between a source of the input AC waveform and the main rectifier; an autotransformer comprising; three separate inputs, each input being connected to only one of the phase conductors, and at least three sets of three phase outputs having output voltage with lower amplitude than the input AC waveform; and three auxiliary bridge rectifiers, each receiving one of the sets of three phase outputs of the autotransformer, each DC output from each auxiliary bridge rectifier connected together in parallel, wherein each output from the three auxiliary bridge rectifiers connected in parallel with an output of the main rectifier, and each leg of the autotransformer satisfies a transformer vector diagram constructed using vertices of an equilateral triangle wherein an arc swung between the vertices is equal to a length of one leg of the triangle.