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Last few decades, multilevel converter topologies have gained a considerable attention. The multilevel converter designs promise a lot of advantages in high power applications, over the conventional converter design such as: lower THD (Total Harmonic Distortion) higher operational voltage ranges, lighter and cheaper topologies. However, due to its higher complexity, also the control algorithms are...
This paper presents three-phase four-level FLC based electric motor drive for mining application supplied directly from a 6 kV ac-grid. It describes complete control algorithms of the drive with active voltage balancing control. The proposed control is verified by experiments carried out on down-scale drive prototype of rated power of 35 kVA.
This paper investigates universal start-up procedure for Flying Capacitor Converter (FLC). Main part of this procedure is pre-charging of the dc-link and flying capacitors. This method is usable for voltage pre-charging in rectifier as well as inverter mode of the multilevel FLC converter. This specific feature is based on use of converter topology and modification of converter switching pulses control...
This paper describes an analog output stage of a combined high side — low side driver suitable for automotive environment. Design of the driver was dictated by the environment — high electromagnetic compatibility (EMC) requirements, low susceptibility, robustness of the driver to transient overvoltage pulses and mis-wiring. The driver has also to fulfill safety requirements. In case of failure conditions...
This paper deals with the reduced-order flux observer for speed-sensorless induction motor (IM) drives, which shows stable operation even at very low speeds. However, noise appears in the estimated flux in higher speeds (starting around 0.5 p.u.) in the motoring mode. An analytical solution for the observer gain that improves noise rejection of the observer in higher speeds is derived. The proposed...
A new digital communication point-to-point protocol, called SENT is briefly described. The main focus of this article is the analysis of SENT EMC emissions and their minimization. The theoretical limitations when using a conventional approach for emission suppression with slope shaping are described. Finally a new approach with better EMC performance is described and its performance is presented.
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