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 39 for “"loss analysis"”.
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Stress and loss analysis of quasi-resonant converters
… switching frequency and reducing the switching losses. There are several merits and demerits of this class of converters. The most important aspects of this research are to assess the advantages and limitations of QRCs in terms of their device current and voltage stresses and a determination of …
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MEMS Simulations and Waveguide Loss Analysis forPhotonic Integrated Circuits
… as phase shifters and understanding waveguide losses. MEMS devices can be actuated by applying a potential difference, and can be used to adjust the phase shift of light travelling through the waveguides. The shift is observed as a result of the change of the physical distance between the …
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Soft Switching Control and Loss Analysis for High Frequency Power Converters
… frequencies below 100 kHz to mitigate switching losses. This imposed limitation poses a challenge in attaining elevated power density, primarily due to the need for bulky filter inductors and capacitors. Wide bandgap (WBG) power semiconductor devices are considered game-changing devices to …
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Loss analysis of the power conversion efficiency of organic bulk heterojunction solar cells
… cells are analyzed. The electrical and optical losses are investigated for one representative material combination using two models for the bulk heterojunction solar cells. These models allow the simulation of current-voltage characteristics of the solar cells. The deficiencies of the bulk …
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Approaches for electromagnetic and loss analysis in electrical machines with superconducting AC windings
L'abstract è presente nell'allegato / the abstract is in the attachment
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Study of Second Generation High Temperature Superconductors: Electromagnetic Characteristics and AC Loss Analysis
… their electromagnetic characteristics and AC loss analysis. Lorentz Force Electrical Impedance Tomography (LFEIT) is one of the most promising hybrid diagnostic scanners with burgeoning potential for biological imaging, particularly in the detection of cancer and internal haemorrhages. The …
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Silicon bottom subcell fabrication, loss analysis and shunt identification for two-terminal multijunction solar cells
… tandem device. A contactless voltage loss analysis methodology is developed, and used to optimize the tunnel junction of the device. Finally, a general methodology to identify the shunted cells in two-terminal tandem devices is developed and validated in GaAs/GaAs tandem device. These …
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Non-intrusive efficiency estimation of inverter-fed induction machines
… motors that is based on harmonic regression analysis, harmonic equivalent circuit parameter estimation and harmonic loss analysis using limited measured data. Firstly, considerations for inverter-fed induction motor equivalent circuit modelling and parameter estimation techniques suitable for …
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Mixed Monte Carlo in the foreign exchange market
… both model-generated and market data. Profit and loss analysis of hedging FX derivatives using the mixed Monte Carlo method is conducted when hedging against both model-generated and market data .
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Incorporation of Hysteretic Effects in Model-Order Reduction Analysis of Magnetic Devices
… is presented that builds upon recent work in loss analysis and magnetic equivalent circuit (MEC) modeling. The approach utilizes MEC models in conjunction with linearization and model-order reduction techniques to process magnetic devices based on geometry and core type. The validity of …
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Design study and analysis of a conventional radial-field flux-switching permanent magnet machine for a medium-speed wind turbine
… optimizer; as well as an in-depth core loss analysis. The designing process started with an analytical design that was used for initial design purposes, and this was followed by numerical simulations to get an optimized solution. Within the numerical simulations, the parametric analysis …
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High-Efficiency Low-Voltage High-Current Power Stage Design Considerations for Fuel Cell Power Conditioning Systems
… order to prevent excess waste of energy. Since loss is dissipated as heat, efficiency directly affects system reliability as well. High temperatures negatively affect system reliability. Components are much more likely to fail at high temperatures. In order to obtain excellent efficiency and …
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A New Solution to Market Definition: An Approach Based on Multi-dimensional Substitutability Statistics
… in the past three decades since the Critical Loss Analysis (CLA) was proposed in 1989. The CLA helps the Hypothetical Monopolist Test to determine whether the hypothetical monopolist is going to profit from the small but significant and non-transitory increase in price (SSNIP). However, the …
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Influence of Mechanical Loading and Temperature on the Magnetic Properties of FeCo-2V Soft Magnetic Alloy
… Sheet Tester (SST) measurements, and magnetic loss analysis, this work offers a multiscale perspective on the relationship between mechanical deformation, microstructural evolution, and magnetic performance. Initial studies revealed that Lüders band formation is driven by dislocation-induced …
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Laser weld pool optical diagnostics: Topography and visualization used for surface contour analysis and process monitoring
… cover gas flow, recoil pressure, and mass loss. Analysis shows the volume change associated with density change, the volume change associated with mass loss, and recoil pressure are the most important phenomena to incorporate into the thermocapillary flow models of the weld pool in order to …
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Reengineering food traceability systems
… the globe, which is a result of information loss in the traceability systems either within a supply chain operator or between the links. Well-organized approaches to enhance information flow and reduce information loss in traceability systems are still not adequately present in the …
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Evaluation and Design of a SiC-Based Bidirectional Isolated DC/DC Converter
… topologies are explained. A comparative analysis between the two converter topologies, focusing on total device loss, has been performed. It was found that the CLLC converter has lower total device loss compared to the dual active bridge converter under the given specifications. Loss …
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Characterization and Failure Mode Analysis of Cascode GaN HEMT
… with faster transition and lower switching loss. By applying the GaN HEMT in a circuit design, it is possible to achieve high frequency, high efficiency, and high density power conversion at the same time. To characterize the switching performance of the GaN HEMT, an accurate behavior-level …
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Gating Methods for High-Voltage Silicon Carbide Power MOSFETs
… operation of the SiC power MOSFET and the loss analysis will be performed for the voltage-mode and current-mode drivers. Additionally, a solution incorporating a multi-level voltage-mode driver is proposed as an alternative to the other methods. The comparison of these techniques and their …
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Design and Implementation of a Radiation Hardened GaN Based Isolated DC-DC Converter for Space Applications
… power stage, as well as a comprehensive power loss analysis. Furthermore, this work includes details to implement a conventional hard-switched Full Bridge DC-DC converter for this application. An efficiency and component stress comparison was performed between the hard-switched Full Bridge …
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