Sökning: "switching frequency"
Visar resultat 6 - 10 av 181 avhandlingar innehållade orden switching frequency.
6. Markov Regime Switching in Economic Time Series
Sammanfattning : This dissertation studies statistical properties and applications of the Markov switching models for economic time series in five separate papers. The two main statistical themes are (i) the task of choosing the number of states to use in the model, and (ii) inference on time-varying transition probabilities. LÄS MER
7. On small-signal analysis and control of the single- and the dual-active bridge topologies
Sammanfattning : 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. LÄS MER
8. Reduction of Audible Noise of a Traction Motor at PWM Operation
Sammanfattning : A dominating source for the radiated acoustic noise from a train at low speeds is the traction motor. This noise originates from electromagnetic forces acting on the structure resulting in vibrations on the surface and thus radiated noise. It is often perceived as annoying due to its tonal nature. LÄS MER
9. Modeling and Design of Modular Multilevel Converters for Grid Applications
Sammanfattning : This thesis aims to bring clarity to the dimensioning aspects and limiting factors of the modular multilevel converter (MMC). Special consideration is given to the dc capacitors in the submodules as they are a driving factor for the size and weight of the converter. LÄS MER
10. Components based on optical fibers with internal electrodes
Sammanfattning : The topic of this thesis is development ofdevices fortelecom applications based on poled optical fibers. The focusis on two different specific functions, wavelength conversionand optical switching.Optical switching is demonstrated in a poled optical fiberat telecom wavelengths (~1.55 mm). LÄS MER