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 21 for “"film capacitors"”.
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Degradation mechanisms of barium titanate based thick film capacitors
… of high K (≅ 500) barium titanate based thick film capacitors were studied. It was found that a gold conductor made from Au metallo-organic paste is not compatible with the porous high K dielectric material. The leakage current of a thick film capacitor made from Ag/Pd thick film conducting …
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Degradation in lead zirconate titanate thin film capacitors for non-volatile memory applications
… properties in Lead Zirconate Titanate (PZT) thin film capacitors is presented in this work. Metal- Ferroelectric - Metal capacitors were prepared by sputtering and metal organic decomposition (MOD) techniques. Samples with several different film thicknesses were considered in this study. …
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Reliability and processing of ferroelectric thin film capacitors with emphasis on fatigue and etching
… a binary state device in the form of a thin film ferroelectric capacitor that can be used to store digital information. This provides opportunities for the development of high speed, low cost and low power, nonvolatile memory devices. The development of commercial ferroelectric memory devices …
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A critical investigation into the properties of metallised film capacitors for high quality sound reproduction
… a Knowledge Transfer Partnership withIndustrial Capacitors (Wrexham) Ltd to assess the effects of metallised filmpolypropylene capacitors on key sonic attributes of reproduced sound. The capacitorsunder investigation were found to be electrically identical whilst exhibiting differinglevels of …
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Impact of the interface on the paraelectric to ferroelectric phase transition in expitaxial BaSrTiO 3 thin film capacitors
… of the area of the incorporated storage capacitors. As a consequence, the film thickness of the used dielectrics has to be decreased in a similar way. When considering state-of-the-art dielectrics showing a relative permittivity er of around 10-25, the necessary thicknesses are well below …
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A study of high-K dielectric materials in conjunction with a multilayer thick-film system
… has been studied, individually as thick-film capacitors and as buried components incorporated in second-order lowpass and bandpass RC active filter circuits. The materials were electrically characterized in terms of the variation of dielectric constant and dissipation factor with …
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Effects Of Deposition Temperature And Post Deposition Annealing On The Electrical Properties Of Barium Strontium Titanate Thin Film For Embedded Capacitor Applications
… increased by implementing the embedded capacitors, resistors and inductors. This would free up surface real estate allowing either a smaller footprint or more silicon devices to be placed on the same sized substrate. This thesis focuses on the effect of deposition temperature and post …
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Dielectric and Ferroelectric Properties of Lead Lanthanum Zirconate Titanate Thin Films for Capacitive Energy Storage
… related storage methods are hot topic nowadays. Capacitors that supply high instant power are one of the keys in this application for both economic and functional design aspects. To lower the cost and increases the volumetric efficiency and reliability, relaxor thin films are considered as one of …
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Thin-film trench capacitors for silicon and organic packages
… modules. Amongst the power components, thin film capacitors are considered the most challenging to integrate because of several manufacturability concerns. The challenges are related to process compatibility of high permittivity dielectrics with substrates and high surface area electrodes, …
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A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR
Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are less reliable in nature. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability …
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Stacked switched capacitor energy buffer architecture
Electrolytic capacitors are often used for energy buffering applications, including buffering between single-phase ac and dc. While these capacitors have high energy density compared to film and ceramic capacitors, their life is limited and their reliability is a major concern. This thesis presents …
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Microstructure, Tunable and Pyroelectric Properties of Laser-Ablated Ba (Zr0.25 Ti0.75) O3 Thin Films
… wireless communication and thermal imaging. Thin film capacitors made of ferroelectric materials have been widely studied for use as active elements in those devices due to their excellent performances. The application of ferroelectric thin films in infrared sensors is based on the induced …
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Modeling strategy for EMI filter and flyback transformer
… The strategy covers different types of film capacitors, common mode chokes, and circuit topologies. This dissertation also provides an approach to asserting the parasitic capacitance of transformers through 2D analysis. Contradictory to the existing models that relate the parasitic …
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Switchmode Power Supply Miniaturization with Emphasis on Integrated Passive Components on Prefired High Performance Ceramic Substrates
… are examined in this work. Thick film passive components (capacitors and resistors) on AlN have been developed. Also, guidelines for the design implementation and steps necessary to integrate these passive components on prefired alumina (Al2O3) and aluminum nitride (AlN) ceramic …
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Power Converter and Control Design for High-Efficiency Electrolyte-Free Microinverters
… improve the long-term reliability, electrolytic capacitors must be avoided in microinverters because they have been identified as an unreliable component. One solution to avoid electrolytic capacitors in microinverters is using a two-stage architecture, where the high voltage direct current (DC) …
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Design and Control of Charge-Pumped Reboost Converter for PV Applications
… The design avoids the use of electrolytic capacitors in favor of smaller ceramic capacitors and a few large film-capacitors. A simplified model is proposed which is still suitable for use in the design of high-bandwidth control loops. Testing is done with a PV source showing preliminary …
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Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… design of a full-bridge converter. In addition, film capacitors can be used instead of electrolytic capacitors in the system, and thus the whole system reliability is improved. A set of ac passive plus active filter solutions is proposed for the ac-dc bus-interface converter which significantly …
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Integration of Ferroelectric Materials into High Density Non-Volatile Random Access Memories
… a binary state device in the form of a thin film ferroelectric capacitor that can be used to store digital information. In a high density memory the capacitor is placed on the top of a poly-silicon plug which is connected to the drain of a transistor. Such a configuration poses constraints on …
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Investigating the Thermal Stability and Cation Ordering in Layered Cathode LixMO2 (x ≤ 1; M = Co, Mn, Ni) Materials for Li-ion Rechargeable Batteries and Studying the Ferroelectric Properties of LiNbO3 Nanoparticles
… as electronics, non-volatile memories, and thin film capacitors. LiMO2 was synthesized and characterized to understand the correlation between capacity fading and thermal stability relating to the microstructures. Our results showed that delithiated (charged) LiCoO2, forms a metastable LiCo2O4 …
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Innovative GaN Multilevel Inverter For Motorsport Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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