Binary magnetic field sensors as information source for alternate current directions in direct and indirect frequency converters

This paper focusses the potential of binary magnetic field sensors for detecting the polarity of alternate currents in direct and indirect frequency converters. Because of the noninvasive measuring strategy, based on the inherent magnetic field of the current to be measured, it seems to be suitable as information source for elimination of the disturbing dead-time effect. Based on the knowledge of currents polarity, so called one-step commutation strategies lead to a further improvement of voltage and current waveforms and last but not least to a better efficiency due to the reduced number of switching acts per cycle period.