Search for dissertations about: "hybrid converters"

Showing result 1 - 5 of 19 swedish dissertations containing the words hybrid converters.

  1. 1. Analysing hybrid drive system topologies

    University dissertation from Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology

    Author : Karin Jonasson; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : In this thesis a simulation model is presented that enables a comparison of different hybrid topologies, with respect to fuel consumption, emissions and performance. The obtained results stress the properties of the different topologies and form a foundation for the choice of hybrid topology. READ MORE

  2. 2. Advanced Schottky Diode Receiver Front-Ends for Terahertz Applications

    University dissertation from Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology

    Author : Peter Sobis; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; terahertz electronics; TRL-calibration; frequency converters; down converters; phase shifters; S-parameter measurements; Schottky diodes; subharmonic mixers; radiometers; terahertz technology; submillimetre wave technology; heterodyne receivers; differential phase shifters; sideband separating mixers;

    Abstract : This thesis treats the development of high frequency circuits for increased functionality of terahertz receiver front-ends based on room temperature Schottky diode technology. This includes the study of novel circuit integration schemes, packaging concepts as well as new measurement and characterisation techniques. READ MORE

  3. 3. High Frequency (MHz) Resonant Converters using GaN HEMTs and Novel Planar Transformer Technology

    University dissertation from Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology

    Author : Hari Babu Kotte; kent Bertilsson; Bengt Oelmann; Noel Shammas; Torbjörn Thiringer; Per Karlsson; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GaN HEMTs; MHz Frequency; Resonant Converters; Planar Transformer Technology;

    Abstract : The increased power consumption and power density demands of moderntechnologies have increased the technical requirements of DC/DC and AC/DC powersupplies. In this regard, the primary objective of the power supply researcher/engineeris to build energy efficient, high power density converters by reducing the losses andincreasing the switching frequency of converters respectively. READ MORE

  4. 4. Efficient Modeling of Modular Multilevel Converters for HVDC Transmission Systems

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Noman Ahmed; Hans-Peter Nee; Tim Green; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-Voltage dc; Modular Multilevel Converter; Voltage-Source Converter; HVDC Grids; Multiterminal DC Systems; Hybrid HVDC Breaker; Modeling; Electrical Engineering; Elektro- och systemteknik;

    Abstract : The drive towards getting more and more electrical energy from renewable sources, requires more efficient electric transmission systems. A stronger grid, with more controllability and higher capacity, that can handle power fluctuations due to a mismatch between generation and load is also needed. READ MORE

  5. 5. Thermal and State-of-Charge Balancing of Batteries using Multilevel Converters

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Faisal Altaf; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermal balancing; Convex optimization; DC-link ripple; Battery ripple; Battery control; Hybrid electric vehicles.; Multilevel converter; Cell balancing;

    Abstract : Driven by the needs to reduce the dependence of fossil fuels and the emissions of conventional vehicles there has in recent years been an increasing interest in battery-powered electrified vehicles (xEVs). In xEVs, the battery pack, built from many small cells, is one of the most expensive components in the powertrain. READ MORE