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 20 for “"loss measurement"”.
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Switching-Loss Measurement of Current and Advanced Switching Devices for Medium-Power Systems
… a usable power source with the lowest amount of loss. A considerable portion of these losses are due to the use of switching devices themselves. Device losses can be apportioned to conduction loss and switching loss. It is commonly known and practiced that conduction loss can be reduced by …
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Development of an automated efficiency and loss measurement system for high-efficiency power converters
… the development of an automated efficiency and loss measurement system for high-efficiency power converters. The design, construction, calibration, and evaluation of such a measurement setup is described, including development of software to control the system. Application of the setup to a …
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Output Capacitance Loss Measurement and Validation for Low-Voltage Silicon and GaN Devices in DC-DC Converter Applications
… that these converter topologies can help achieve loss-less switching in a power device. However, this theory is not completely true as there even with soft-switching there is some degree of loss associated in the form of output capacitance-related hysteresis loss, channel turn-off loss, and loss …
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Wideband Terrestrial Path Loss Measurement Results For Characterization of Pico-cell Radio Links at 38 GHz and 60 GHz Bands of Frequencies
… broadband wireless channels by measuring path loss statistics during different weather conditions. Hardware and software components of a wideband direct-sequence spread spectrum (DSS) channel sounding system, used extensively throughout measurement campaigns, are discussed in detail in this …
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Application of improved core loss formulations to machine design
The primary focus of this thesis is in core loss measurement and modeling techniques and their impact in machine design. In practice, steel manufacturers usually supply core loss data either at 50/60Hz, 1.5T or curves (core loss vs. flux density) at 50 and/or 60Hz. There is growing need for …
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An Investigation of Fundamental Frequency Limitations for HF/VHF Power Conversion
… between power level and frequency. The power losses in the semiconductor devices are discussed, and optimization criteria for minimizing the power losses of the devices, are discussed. By relating the power losses to the semiconductor materials' properties, a methodology for selecting proper …
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Characterizing and modeling methods for power converters
… even higher, to decrease its size. However, the loss generated in the converter increases drastically due to the high switching frequency. In addition, a wide-band feedback controller is required to accommodate the high switching frequency in the converter. We focus on the characterization or …
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Applications of long storage time optical cavities
Optical precision measurements have become one of the most important tools in physics to test the fundamental laws and to probe the universe around us. Often such experiments require high finesse cavities, and optical loss in these cavities is a critical parameter. In particular, for those cavities …
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An Experimental Investigation of Churning Power Losses of a Gearbox
In this study, load-independent (spin) power losses of a gearbox operating under dip-lubrication conditions are investigated experimentally. A family of final drive helical gear pairs from an automotive transmission is considered as the example for this investigation. A dedicated gearbox is …
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Core loss characterization and design optimization of high-frequency power ferrite devices in power electronics applications
An impedance-based core loss measurement technique for power ferrites, the modeling and analysis of mechanisms of high-frequency losses, and design methodology for optimization for high-frequency magnetics are presented. The high-frequency losses of ferrite materials are characterized employing a …
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An experimental approach into the degradation of wind turbine blade coating systems due to rain and weathering
… behaviour. A novel methodology, using surface gloss, was used to quantify erosion and then categorise the specimen into one of the developed erosion stages. Additionally, this approach provides a greater accuracy in erosion quantification than the current method of mass loss measurement and the …
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Very High Frequency Integrated POL for CPUs
… still lacks investigation. In terms of loss property, the previous works usually show the equivalent resistance value only, which is usually measured with small-signal excitation from an impedance/network analyzer and is not able to represent the real magnetic core loss under …
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High Frequency Ethernet Cabling Analysis and Optimization
… engineer impedance profile from the return loss measurement of Ethernet cables using genetic algorithms. The method can be applied in situations where time domain tests are inaccessible or only simple (magnitude) tests in the frequency domain are available and there is the need for impedance …
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High Frequency Magnetic Core Loss Study
… rotate and consume energy, which is the core loss. The core loss depends on the AC flux frequency, amplitude, waveform, DC bias and temperature. These dependences are nonlinear and difficult to predict. How to measure, model and analyze the core loss is a challenge for decades. In this …
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Customisable Magnetic Components Using Nanocrystalline Flake Ribbon
… magnetic components with reduced losses, compact dimensions, lighter weight, and cost-effectiveness. Traditional methods for core customisation are cumbersome, time-consuming, and costly when producing small series of magnetic cores. Recently developed magnetic cores customised …
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Unlocking SiC MOSFET Switching Performance Through Packaging and Instrumentation
… resistances and input capacitances, this reduces losses and supports higher switching frequencies. In contrast, packaging and measurement technologies have not significantly evolved to support these emerging high-speed devices. Traditional wire-bonding packaging technologies that were originally …
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Synthesis, Characterization and Corrosion Inhibition Investigation of substituted triazines on aluminium and mild steel in 1M HCl: Experimental and Theoretical approach
… temperature. It was observed that the mass loss of DMT, DPT, and DNT begins when the temperature reaches 85.91˚C, 181.007˚C, and 253.82˚C, respectively. Their anti-corrosive effect on Al and MS in 1M HCl was studied at a lower temperature using gravimetric analysis, electrochemical impedance …
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Improving algorithmic performance using stochastic learning rates: In-expectation and almost-surely stochastic approximation, and online learning, results and applications
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Alternative structures for integrated electromagnetic passives
… algorithm combining electromagnetic design and loss models has been developed to optimize and evaluate the spiral winding structure. High power density of 480 W/in3 has been obtained on the prototype. Due to the structural limitation, the currently applied planar spiral winding structure does …
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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 …