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.
Results
Showing 1 to 17 of 17 for “"power voltage."”.
-
Degradation mechanisms of barium titanate based thick film capacitors
… space charge limited current behavior with a 3/2 power voltage dependence. Voltage independence of thermal activation energy and time dependence of a leakage current have been observed. A healing effect by reversal of bias polarity and humidity effect on leakage current have also been studied. The …
-
Improving the Maximum Power Point Tracking Efficiency of Photovoltaic Arrays via Machine Learning and Deep Learning
… Local Maximums (LMs) can originate on the Power-Voltage (P-V) curve under nonuniform irradiance conditions. There are many maximum power point tracking (MPPT) algorithms developed to detect the true maximum power point (MPP) of a PV array. However, in the real-world environment, limited …
-
On-Chip Voltage Controlled Oscillator for Clock Data Recovery Systems
… maximum benefit. However, designing robust, low power, high speed IO links is very challenging due to the increased transmission line loss, cross talk, and signal distortion resulting in intersymbol interference. Synchronous sampling is often employed to overcome these challenges. However, …
-
An energy optimal power supply for digital circuits
… circuits at their minimum energy operating voltage (MEP) has been proposed as a solution for energy critical applications where performance is not a key constraint. This thesis explores the sensitivity of the MEP to operating conditions and motivates the need for continuous minimum energy …
-
Development of expert systems as on-line operational aids
… rapidly. The application of expert systems to power system operations and on-line environments is a new area of research. In this thesis, the issues involved with on-line knowledge based systems for operations is investigated. To begin, the development and validation process involved in …
-
A Time-Domain Modeling of Multi-Element Resonant Converter With Capacitive Output Filter
… converters. The performance curves for DC power, voltage gain, peak switch current, RMS value of switch current, peak capacitor voltage and zero voltage switching (ZVS) angle are presented as a function of the frequency and the load. State-of-the-art design examples have been shown. This …
-
Piezoelectric Transformer and Hall-Effect Based Sensing and Disturbance Monitoring Methodology for High-Voltage Power Supply Lines
… and robust protection system widely used in power distribution. However, in low power sections of relaying systems, standard voltage and current measurement techniques are still used. These techniques have disadvantages like higher cost, size, electromagnetic interference, resistive losses …
-
Drivers of change in the North American electric grid
… propagation, which is caused by an imbalance in power supply and demand at any location of an electric grid. The delay associated with this phenomenon is generally observed in large-scale interconnected power systems, and the impact of large changes in load or generation can be felt over a wide …
-
Fully integrated dc-dc converters with basic and double galvanic isolation
The increasing demand of low-profile power converters in modern electronic devices has pushed research towards integrated systems able to replace expensive and bulky solutions based on discrete components. Consequently, galvanically isolated interfaces are becoming an interesting research topic for …
-
Synthesis and characterisation of DLC and diamond films for gas sensing applications
… conditions such as temperature, pressure, power, voltage, deposition rate, argon, nitrogen as well as oxygen gas flow rate. The as-deposited thin films were characterized using several characterization techniques. The roughness of the sample was studied using atomic force microscopy (AFM) …
-
Gate-geometry Dependence of Enhancement-mode p-GaN Gate High Electron Mobility Transistors
While GaN-based transistors for power electronics have in many situations demonstrated technological superiority over conventional Si based devices, the development of GaN power electronics has only scratched the surface of the possibilities that lie ahead. The most promising device structure for …
-
Experimental Realisation of Energy Harvesters built from Quantum Dots and Quantum Wells
… scales. Our energy harvester can generate a power of 0.13fW in an estimated efficiency with a lower bound around 0.1hC. Our theoretical model (not affected by limitations of the Wiedemann- Franz law) suggests the actual efficiency to be about 0.5hC. Experimental observations of thermal power, …
-
On the application and generation of subsensory electrical nerve stimulation for the improvement of vibration perception in patients with HIV-related sensory neuropathy
… characterised. The circuit is an efficient, low-power voltage to current converter that generates high voltages (120 V peak to peak) from a small, low-voltage rechargeable battery. The design and testing of control and instrumentation circuitry, as well as the addition of various safety and …
-
Deep Reinforcement Learning-Based Approaches for the MPPT Control of Standalone Solar PV Systems
… and irradiance changes. As a result, “maximum power point tracking (MPPT)” methods are employed by researchers to guarantee that solar PV operates efficiently at their special point of operation, called the “maximum power point (MPP)” in various weather circumstances. This helps to increase …
-
Stability analysis of the Namibian power grid with integration of large offshore wind farms using a VSC-HVDC scheme
… Degree of Master of Engineering in Electrical Power, Durban University of Technology, Durban, South Africa, 2021.
-
Koncový zesilovač a subwoofer pro automobil
Tato práce popisuje návrh dvou výkonových zesilovačů pro subwoofer a pro čtyři základní automobilové reproduktory. Dále je součástí práce řešení napájecích obvodů těchto zesilovačů. Ovládání zesilovačů je realizováno pomocí procesoru. Dále se věnuje problematice spojené s ozvučením automobilu, …
-
Uncertainty Modeling of Wind Power Generation for Power System Planning and Stability Study
… renewable energy resources are added to existing power grids. Among them, wind energy resources are becoming a major source of electricity generation. However, wind energy production has a critical downside: intermittency. The intermittent nature of wind energy in combination with the load demand …