J
Johann W. Kolar
Researcher at ETH Zurich
Publications - 1009
Citations - 44219
Johann W. Kolar is an academic researcher from ETH Zurich. The author has contributed to research in topics: Rectifier & Three-phase. The author has an hindex of 97, co-authored 965 publications receiving 36902 citations. Previous affiliations of Johann W. Kolar include Alstom & Infineon Technologies.
Papers
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Journal ArticleDOI
A novel control concept for reliable operation of a three-phase three-switch buck-type unity-power-factor rectifier with integrated boost output stage under heavily unbalanced mains condition
M. Baumann,Johann W. Kolar +1 more
TL;DR: Digital simulations as well as experimental results are shown which confirm the proposed control concept for different mains failure conditions and for the transition from balanced mains to a failure condition and vice versa.
Journal ArticleDOI
Solid state modulator for plasma channel drilling
TL;DR: In this article, a solid state modulator consisting of a single semiconductor switch, saturable inductors and a pulse transformer is presented, which generates a high-voltage pulse for ignition, and a high output-current to expand the plasma.
Journal ArticleDOI
Center-Point Voltage Balancing of Hysteresis Current Controlled Three-Level PWM Rectifiers
TL;DR: In this paper, the authors show that the balancing of the center point voltage can be realized by adding an offset to the input current-reference and that this offset results in a change of the relative on-times of the redundant switching states.
Journal ArticleDOI
Conceptualization and Multiobjective Optimization of the Electric System of an Airborne Wind Turbine
Johann W. Kolar,Thomas Friedli,Florian Krismer,A. Looser,Mario Schweizer,R. A. Friedemann,Peter Steimer,J. B. Bevirt +7 more
TL;DR: In this article, the trade-off between power-to-weight ratio (W/kg) and efficiency of a 100 kW airborne wind turbine with a power kite flying at high speed perpendicular to the wind is investigated.
Proceedings ArticleDOI
An optimized, 99% efficient, 5 kW, phase-shift PWM DC-DC converter for data centers and telecom applications
TL;DR: In this paper, the development, optimization and design process for an efficiency-optimized 5kW, 400 V to 48..54 V phase-shift PWM DC-DC converter with LC-output filter and synchronous rectification is presented.