Sökning: "high-frequency switching"

Visar resultat 21 - 25 av 43 avhandlingar innehållade orden high-frequency switching.

  1. 21. A new Auxiliary Converter Topology with SiC Components for Railway Applications

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

    Sammanfattning : 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. LÄS MER

  3. 22. PEEC modeling and verification for broadband analysis of air-core reactors

    Författare :Mathias Enohnyaket; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrial Electronics; Industriell elektronik;

    Sammanfattning : There is an increasing utilization of modern Power Electronic (PE) devices in power systems, in for example, harmonic filters, reactive power compensation, and current limiting applications. The operational frequencies and switching rates of the PE devices now cover up to the megahertz range. LÄS MER

  4. 23. Wide Bandgap Semiconductor (SiC & GaN) Power Amplifiers in Different Classes

    Författare :Sher Azam; Qamar Wahab; Jörgen Olsson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wide bandgap; SiC; MESFET; GaN; HEMT; Power Amplifiers; Materials science; Teknisk materialvetenskap;

    Sammanfattning : SiC MESFETs and GaN HEMTs have an enormous potential in high-power amplifiers at microwave frequencies due to their wide bandgap features of high electric breakdown field strength, high electron saturation velocity and high operating temperature. The high power density combined with the comparably high impedance attainable by these devices also offers new possibilities for wideband power microwave systems. LÄS MER

  5. 24. Fabrication and Characterization of Nanocontact Spin-Torque Oscillators

    Författare :Sohrab Redjai Sani; Johan Åkerman; Brad Engel; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spin-torque oscillators; phase locking; spin wave; giant magnetoresistance; spin transfer torque; thin films.;

    Sammanfattning : The manufacturing of nanocontact-based spin-torque oscillators (NC-STOs)has opened the door for spintronic devices to play a part as active microwaveelements. The NC-STO has the capability of converting a direct current intoa microwave signal, and vice versa, by utilizing the spin transfer torque (STT)in ferromagnetic multilayer systems. LÄS MER

  7. 25. Electronic Characterization of CVD Diamond

    Författare :Saman Majdi; Carl Hemmingsson; Uppsala universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Diamond is a promising material for high-power, high-frequency and hightemperatureelectronics applications, where its outstanding physical propertiescan be fully exploited. It exhibits an extremely high energy gap, veryhigh carrier mobilities, high breakdown field strength, and the highest thermalconductivity of any wide bandgap material. LÄS MER