Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1011 for “"converters"”.
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Conceptual design of wave energy converters
Despite presenting a vast opportunity as a renewable energy resource, ocean wave energy has yet to gain commercial success due to the design space being divergent. To facilitate convergence, this dissertation has proposed a method using the mechanical circuit framework to transform a linear …
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Optimal control of wave energy converters
Wave Energy Converters (WECs) are devices designed to absorb energy from ocean waves. The particular type of Wave Energy Converter (WEC) considered in this thesis is an oscillating body; energy conversion is carried out by means of a structure immersed in water which oscillates under forces exerted …
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Simulation of SiC MOSFET Power Converters
… the design and implementation of various power converters (Push-pull inverter, Buck converter). Different parameters and scenarios were discussed and implemented for both silicon and silicon carbide MOSFET cases. A comparison between same circuits is done using silicon in the first case and …
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Development of Monolithic DC -Dc Converters
… full integration of the monolithic dc-dc converters. The experimental results confirm the feasibility of the proposed concepts and suggest a few future areas of research.
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Computer Synthesis of Switching Power Converters
A series of examples is presented to demonstrate the applicability of the techniques and models presented in this work.
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Pipelined oversampling analog-to-digital converters
… that of integrated-circuit components. Such converters have an inherent tradeoff between accuracy and speed, whereby resolution in amplitude is achieved at the expense of resolution in time. Although much attention has been focused on improving the speed and power of [delta sigma] …
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Integrated photonic analog-to-digital converters
Accurate conversion of wideband multi-GHz analog signals into the digital domain has long been a target of analog-to-digital converter (ADC) developers, driven by applications in radar systems, software radio, medical imaging, and communication systems. Aperture jitter has been a major bottleneck …
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Nonlinear control of switching power converters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Modeling and measurement of switching converters
… methods of modeling and measurement of switching converters are discussed in this thesis. The average model is very simple but is inaccurate when modulation frequencies approach to one-half of the switching frequency. The discrete model can accurately predict the modulation envelope of the output …
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State-plane analysis of resonant converters
… analysis of a class of resonant de to de power converters. A comprehensive method was developed to understand the complex operation of a resonant converter, identify its operating modes along with their regions of occurrence and determine the de characteristics of the converter in each mode. The …
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Constant-frequency, clamped-mode resonant converters
Two novel clamped-mode resonant converters are analyzed. These clamped-mode converters operate at a constant frequency while retaining many desired features of conventional resonant converters such as fast responses, zero-voltage turn-on or zero-current turn-off, and low EMI levels, etc. The …
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Boost Matrix Converters in Clean Energy Systems
… an investigation of novel power electronic converters, based on the ultra-sparse matrix topology and characterized by the minimum number of semiconductor switches. The Z-source, Quasi Z-source, Series Z-source and Switched-inductor Z-source networks were originally proposed for boosting the …
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Series operation of thyristors in HVDC converters
… alternative to mercury arc valves for hvdc converters. The comparatively low ratings of thyristors necessitate series and parallel connection of thyristors in order to construct a valve of sufficient rating for hvdc operation. The design of thyristor valve should ensure even distribution of …
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Robust optimization framework for wave energy converters
L'abstract è presente nell'allegato / the abstract is in the attachment
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Characterizing and modeling methods for power converters
<p>“Stable power delivery is becoming increasingly important in modern electronic devices, especially in applications with stringent requirements of its form factor. With the evolution of technology, the switching frequency in a power converter is pushed to a higher frequency range, e.g., several …
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Modelling Controlled Arrays of Wave Energy Converters
… wave farms by placing multiple wave energy converters (WECs) together in an array. In this thesis, the WEC array problem is investigated from two di�erent points of view: control and layout of individual WECs in an array. WEC arrays are modelled using hydrodynamic coe�cients from the …
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Novel Concrete Reinforcement for Wave Energy Converters
… novel concrete reinforcement for the wave energy converters. The reinforcement included fibre-reinforced polymer (FRP), synthetic fibres, steel fibres and ultra-high-molecular-weight polyethylene (UHMWPE). 24 cube specimens were tested using a pull-out test where no splitting was allowed to …
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Digital Control Techniques for Switching Power Converters
Digital control methods for switching power converters offer greater robustness, more flexibility to changing operating characteristics, and better system performance than conventional techniques, which are often model-limited and only work well in a small range of conditions. Digital controllers …
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