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 27 for “"di/dt"”.
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Direct current hybrid vacuum breaker
… with a voltage commutation approach. The main difference is whether or not the interruption mechanism deals with the arc. Interrupting the arc not only causes erosion of the electrode surface, therefore reducing useful lifetime, but also introduces uncertainty to the process of successful …
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Optically triggered thyristor for capacitor discharge applications
… trigger semiconductor thyristors for capacitor discharge applications has been conducted. The investigation consisted of a technical literature and background search, design and analysis of optically silicon thyristors, and simulations of a capacitor discharge circuit containing the designed …
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High Power Inverter EMI Characterization and Improvement by Auxiliary Resonant Snubber Inverter
… been commonly identified as high switching dv/dt and di/dt rates interacting with inverter parasitic components. The reduction of parasitic components relies on highly integrated circuit layout and packaging. This is the way to deal with noise path. On the other hand, switching dv/dt and di/dt …
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High Frequency, High Current Integrated Magnetics Design and Analysis
… the task of supplying high current and high di/dt to the microprocessor while maintaining a tight load regulation. As computers have advanced, so have the VRM's used to power them. Increasing the current and di/dt of the VRM to keep up with the increasing demands of the microprocessor does …
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Design and Testing of a SiC-based Solid-State Bypass Switch for 1 kV Power Electronics Building Blocks
… demand, the need for efficient high-density medium-voltage (MV) power converters has increased to support flexible power distribution grids. The modular multilevel converters (MMC) became the most typical MV power converters in applications from 2010. This topology has many advantages, such as …
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Allocating decoupling capacitors to reduce simultaneous switching noise on chips
L dI/dt noise due to simultaneous switching of circuits on chips is a growing problem in VLSI design. This kind of noise can lead to timing errors and significant circuit slowdowns, if not kept within reasonable bounds. The most common way of reducing this form of noise is the addition of …
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Reduction of Switching Losses in IGBT Power Modules
Lo scopo di questo lavoro è quello di studiare diverse strategie di ottimizzazione per pilotare IGBT e proporre una nuova tecnica. In applicazioni di potenza una particolare attenzione deve essere posta per fenomeni come le perdite di commutazione , sovracorrenti in accensione e sovratensione allo …
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New technology for thermal desorption feeding with concentrating solar power (csp) system [Nuove tecnologie per il desorbimento termico alimentato con solare a concentrazione]
In questa tesi di dottorato vengono riportate le attività di ricerca incentrate sulla valutazione del Desorbimento Termico (DT) come tecnologia di bonifica di suoli e sedimenti contaminati, con particolare attenzione all'integrazione di fonti energetiche rinnovabili nel processo. Indagini di …
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Signal and power integrity analysis of bidirectional DC-DC converters for hybrid energy storage systems with EMI/EMC optimization
… energy density and calendar life. A 500W bidirectional synchronous DC-DC converter design is implemented for the active topology of HESS. This thesis examines optimal design principles and practices essential for the printed circuit board (PCB) layout of switching regulators with fast dv/dt …
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Design & optimization of automotive power electronics utilizing FITMOS MOSFET technology
… the device depends on both frequency and on peak di/dt at a given frequency. This dynamic on resistance variation can have a significant application impact.
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A Compact Three-Phase Multi-stage EMI Filter with Compensated Parasitic-Component Effects
… due to high slew rates in the form of high dv/dt and high di/dt at higher switching frequencies compared to the traditional silicon technology. To comply with the stringent conducted emission requirements, EMI filters are adopted to attenuate the high frequency common mode (CM) and differential …
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Design and Control of a Compact 7.2 kW GaN-Based Bidirectional Isolated On-Board Charger (OBC)
… thesis presents significant advancements in bidirectional onboard chargers (OBCs) for electric vehicles, addressing critical challenges in power factor correction, efficiency, and power density. The research introduces innovative control strategies and hardware designs by incorporating high …
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Modeling and Design of a SiC Zero Common-Mode Voltage Three-Level DC/DC Converter
… which make the adoption of such technologies difficult. One of the most notable issues with the application of wide-bandgap technologies is meeting existing noise requirements and regulations. Due to the faster dv/dt and di/dt of SiC devices, more noise is generated in comparison to Si IGBTs. …
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Study on Zero Crossing Detection in CRM Totem-pole PFC Converter
The totem-pole PFC is a promising candidate for achieving high efficiency and high-power-density power factor correction. Critical conduction mode (CRM) or triangular current mode (TCM) operation of totem-pole PFCs has become popular for achieving zero-voltage switching (ZVS). This enables pushing …
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Time dependence in fine-particle systems
… have widespread application in the magnetic recording industry. The particle ensemble considered exhibits both orientational texture and a distribution of particle volumes. The coercivity, (i.e. the magnitude of the field that will just reduce the magnetisation of a saturated system to zero), is …
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Switching Trajectory Control for High Voltage Silicon Carbide Power Devices with Novel Active Gate Drivers
… of the cascaded levels of converters in the distributed system, simplify the system by reducing the number of the semiconductor devices, and increase the system reliability.</p> <p>However, the gate drivers for high voltage SiC devices are not available on the market. Also, the …
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Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies
Switch mode power supplies are widely used in different applications. High efficiency and high power density are two driving forces for power supply systems. However, high dv/dt and di/dt in switch mode power supplies will cause severe EMI noise issue. In a typical front-end converter, the EMI …
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Innovative GTO Thyristor Based Switches Through Unity Gain Turn-Off
… technique, namely unity gain turn-off, is studied. Several innovative approaches, which realize this driving requirement, are proposed, analyzed and experimentally demonstrated in this dissertation. The Emitter Turn-Off Thyristor (ETO) is a new family of high power semiconductor devices that …
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High-performance compact gas filled spark switches
… pulsed power systems for their high rate of dV/dt, dI/dt, fast closing times with low jitter, and their high voltage and current capability. Recently there has been a renewed interest in designing spark switches that can operate with environmentally friendly gases such as air. This thesis …
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Advanced Semiconductor Device and Topology for High Power Current Source Converter
This dissertation presents the analysis and development of an innovative semiconductor device and topology for the high power current source converter (CSC). The CSC is very attractive in high power applications due to its lower output dv/dt, easy regeneration capability and implicit short-circuit …
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