- About
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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 31 to 40 of 5581 (0.024 seconds)| 31 |
Finite state machine for the implementation of digital filtersProudler, I. K. January 1984 (has links)
No description available.
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Theoretical studies of scanning tunnelling microscopy and tunnelling phenomenaLawunmi, David Laditi January 1991 (has links)
No description available.
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Switched-mode power conversionForsyth, A. J. January 1987 (has links)
The thesis begins with a general introduction to switched-mode power conversion. The main application areas of the technique are outlined and a summary is presented of current research work. The following chapters then focus on one recent development in the field, the Cuk converter and integrated magnetics. First, the steady-state performance limitations of the Cuk converter are explored through a comparison with the basic switched-mode converter topologies. The circuit is seen to possess several attractive properties including input and output current waveforms which are continuous rather than pulsating. However, the switching losses are shown to be high. A regenerative snubber is presented which reduces the transistor turn-off loss whilst preserving the high-quality input and output current waveforms of the converter. The integrated magnetics technique is discussed in the following chapter. This is the technique whereby converter magnetic components are coupled to eliminate input and output ripple currents and therefore improve steady-state performance. The possible problems are highlighted of attempting to couple transformers and inductors on a single core and an alternative coupling technique is outlined which uses an auxiliary electric circuit. The introduction of magnetic coupling in the Cuk converter to eliminate input and output ripple currents and improve steady-state performance results in more complicated dynamic characteristics and a more complex control problem. The state-space averaging technique is used in chapter 4 with the aid of a control engineering design package, CLADP, to analyse the problem. The impact of component coupling on the converter dynamic characteristics is explained and possible control strategies are suggested and verified. Finally, the Cuk converter with component coupling is assessed as a large-signal waveshaper. Several inverter configurations are examined in which a switched-mode converter operating under closed-loop control is used as a waveshaper to synthesise high-quality sinusoidal output currents. The implementation of the schemes using a Cuk converter with component coupling is described.
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Electricity interchange between integrated grid systems : Methods and case studiesDowlatabadi, H. January 1984 (has links)
No description available.
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The design of multiport microwave directional couplersHerscher, B. A. January 1983 (has links)
No description available.
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Indirect rotor position sensing for switched reluctance motor drivesPanda, Sanjib Kumar January 1991 (has links)
No description available.
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Boost modulation : control of AC variable speed drivesLarbes, Cherif January 1990 (has links)
No description available.
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Microprocessor-based control of electromechanical devicesElsamhy, A. M. January 1981 (has links)
No description available.
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Digital control of high frequency pulse-width modulated invertersStevens, M. J. January 1985 (has links)
No description available.
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| 40 |
High frequency multi-element transformers for switched-mode power suppliesWilliams, Richard January 1992 (has links)
No description available.
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