Advanced search

Showing result 1 - 5 of 23 swedish dissertations matching the above criteria.

  2. 1. Compact Modeling of Si and SiC Power Diodes

    Author : Rémy Kolessar; KTH; []
    Keywords : TCAD; power diode; circuit simulation; physics-based modeling; turn-on; turn-off; forward recovery; reverse recovery; silicon; silicon carbide;

    Abstract : .... READ MORE

  4. 2. A new Auxiliary Converter Topology with SiC Components for Railway Applications

    Author : LUYU WANG; Industriell elektroteknik och automation; []
    Keywords : Auxiliary converter; Multilevel converter; ; Silicon Carbide transistors;

    Abstract : Smaller size and lower weight are always the targets of the power electronic product development. This work introduces two new topologies of auxiliary converters which have the feature of fewer components and fewer number of energy conversion stages comparing with the conventional auxiliary converter used in railway applications. READ MORE

  5. 3. On small-signal analysis and control of the single- and the dual-active bridge topologies

    Author : Georgios D. Demetriades; Hans-Peter Nee; Jorma Kyyrä; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; DC-DC converters; Soft-switching; High-frequency; High-power; Bi-directional; Single-Active Bridge; Elektronik; Electronics; Elektronik;

    Abstract : High-frequency dc-dc converters are nowadays widely used in a diversity of power electronic applications. High operating frequencies entail a reduction in size of the passive components, such as inductors, capacitors and power transformers. READ MORE

  6. 4. On the design of hybrid DC-breakers consisting of a mechanical switch and semiconductor devices

    Author : Jesper Magnusson; Göran Engdahl; Staffan Norrga; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DC; circuit breaker; hybrid breaker; DC systems; DC; brytare; hybridbrytare; likström;

    Abstract : The interest of using direct current in networks for both transmission and distribution of power is increasing due to the higher efficiency compared to the alternating current used today. As no natural zero crossings exist in direct current, the interruption of fault currents becomes a challenge. READ MORE

  7. 5. Three-Dimensional Modelling and Inversion of DC resistivity and Time Domain EM data using Multi-Resolution Framework

    Author : Jingyu Gao; Thorkild Maack Rasmussen; Maxim Smirnov; Bülent Tezkan; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DC Resistivity; time-domain electromagnetic; forward modelling; data inversion; Prospekteringsgeofysik; Exploration Geophysics;

    Abstract : 3-D forward modelling and inversion techniques play an important role in data interpretation, but they are still computationally challenging tasks. Therefore, this thesis aims to improve forward modelling and inversion performance using novel multi-resolution (MR) grid approach. READ MORE