Johann W. Kolar

TL;DR: In this article, a phase-modular isolated matrix-type rectifier, which can be connected to the mains either in star (Y) or delta (Δ), enabling a wide input voltage range is presented.

TL;DR: In this paper, the concept, design and implementation of a millimeter-scale bearingless slice motor featuring a rotor diameter of 4 mm has been presented, and the slotless stator topology is optimized by means of 3D finite element method electromagnetic simulations.

TL;DR: In this article, a detailed overview of the literature regarding machining induced core losses in ferrite, dating back to the early 1970s, is provided which suggests that the observed excess core losses could be attributed to a deterioration of surface layer of the plates caused by mechanical stress exerted during machining.

TL;DR: The operating principle of a two-stage 3-Φ buck-boost current DC-link PFC rectifier system is first introduced and its optimal operating modes, minimizing conduction losses, switching losses, and CM noise emissions for every DC output voltage level, are identified.

TL;DR: In this article, a series resonant converter topology using a synergy between boundary and discontinuous conduction mode operation is proposed, whereby low peak-to-average ratio transformer current waveforms, soft-switching throughout the full power range and tight regulation of the output voltage for a wide input voltage range are achieved.