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Dissertations / Theses on the topic 'Portable power applications'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Jiang, Xufeng. "Envelope-tracking power supplies for RF power amplifiers in portable applications." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256446.

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Simon, Thomas D. (Thomas David). "A low power video compression chip for portable applications." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9474.

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Sundar, Siddharth. "A low power high power supply rejection ratio bandgap reference for portable applications." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46517.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (p. 86-87).<br>A multistage bandgap circuit with very high power supply rejection ratio was designed and simulated. The key features of this bandgap include multiple power modes, low power consumption and a novel resistor trimming strategy. This design was completed in deep submicron CMOS technology, and is especially suited for portable applications. The bandgap designed achieves over 90 dB of power supply rejection and less than 17 microv

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Bravo, Diaz Laura. "Sorption properties in lightweight hydrogen storage materials for portable power applications." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8893/.

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Modern society increasingly depends on reliable and secure energy supplies for economic growth and social prosperity. Thus, it is crucial to implement a low-carbon energy carrier based on renewable energy sources to ensure energy security and tackle climate change. Hydrogen (H2) is undoubtedly one of the most promising energy carriers to achieve a low-carbon energy future scenario. However, before the hydrogen economy can become completely viable, the safe and compact storage of H2 is an issue that must be overcome. This thesis concentrates on the development of potential “modular” solid state

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Sahu, Biranchinath. "Integrated, Dynamically Adaptive Supplies for Linear RF Power Amplifiers in Portable Applications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7607.

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Energy-efficient radio frequency (RF) power amplifiers (PAs) are critical and paramount to achieve longer battery life in state-of-the-art portable systems because they typically determine and dominate the power consumption of such devices. In this dissertation, a high-efficiency, linear RF PA with a dynamically adaptive supply and bias current control for code division multiple access (CDMA) and wideband CDMA (WCDMA) is conceived, simulated, and experimentally demonstrated with a discrete PCB-level design and in integrated circuit (IC) form. The PA efficiency is improved by dynamically adjust

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Islas, Ohlmaier Abraham. "Design of programmable, low power, low dropout voltage regulators for portable applications." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4689.

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As portable electronics constantly find their way into the hands of eager consumers, the demands placed on these products and their circuits are ever increasing. More features and more performance are continuously demanded by consumers. This feature-driven market has brought with it several constraints on the type of circuits utilized in developing these portable devices. Cell-Phones, PDA's, MP3 players and various other portable electronics require different voltage levels to power different architectures that realize the many features within the device. This work demonstrates a technique to

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7

Hung, Chung-Chih. "Low voltage, low power CMOS analog circuit design techniques for mobile, portable VLSI applications /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487943341527253.

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Hu, Anqiao. "Green Electronics: High Efficiency On-chip Power Management Solutions for Portable and Battery-Powered Applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291144939.

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Chawla, Ravi. "Power-efficient analog systems to perform signal-processing using floating-gate MOS device for portable applications." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6823.

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Digital Signal Processors (DSPs) have been an important component of all signal processing systems for over two decades now. Some of the obvious advantages of digital signal processing are the flexibility to make specific changes in the processing functions through hardware or software programming, faster processing speeds of the DSPs, cheaper storage, and retrieval of digital information and lower sensitivity to electrical noise. The explosive growth of wireless and signal processing applications has resulted in an increasing demand for such systems with low cost, low power consumption, and

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Chawla, Ravi. "Power-efficient analog systems to perform signal-processing using floating-gate MOS device for portable applications." Available online, Georgia Institute of Technology, 2005, 2004. http://etd.gatech.edu/theses/available/etd-01052005-144937/unrestricted/chawla%5Fravi%5F200505%5Fphd.pdf.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2005.<br>Paul Hasler, Committee Member ; Joy Laskar, Committee Chair ; Phil Allen, Committee Member ; Dave Anderson, Committee Member ; Mark T. Smith, Committee Member. Includes bibliographical references.

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Alzoubi, Khawla Ali. "NANO-ELECTRO-MECHANICAL SWITCH (NEMS) FOR ULTRA-LOW POWER PORTABLE EMBEDDED SYSTEM APPLICATIONS: ANALYSIS, DESIGN, MODELING, AND CIRCUIT SIMULATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1278511770.

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Malou, Amokrane. "A study on an integrated 4-Switch Buck-Boost DC-DC converter with high efficiency for portable applications." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI027.

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L’augmentation des performances des produits portables requièrent une exploitation la plus efficace possible de la batterie afin de permettre à ces produits d’être utilisés le plus longtemps possible avant d’être rechargés. Les circuits en aval ont besoin d’une source de tension stable qui peut varier pour chacun d’entre eux entre 1.0 V et 5.5 V à partir d’une tension d’entrée pouvant varier entre 2.5V et 5V. Un convertisseur DC-DC à 4 interrupteurs de type dévolteur-survolteur apparait comme une solution intéressante permettant des opérations de diminutions et d’augmentations de tension d’une

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Feng, Junjie. "6.78MHz Omnidirectional Wireless Power Transfer System for Portable Devices Application." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101839.

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Wireless power transfer (WPT) with loosely coupled coils is a promising solution to deliver power to a battery in a variety of applications. Due to its convenience, wireless power transfer technology has become popular in consumer electronics. Thus far, the majority of the coupled coils in these systems are planar structure, and the magnetic field induced by the transmitter coil is in one direction, meaning that the energy power transfer capability degrades greatly when there is some angle misalignment between the coupled coils. To improve the charging flexibility, a three–dimensional (3D) coi

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BARBERA, ORAZIO. "Direct methanol fuel cell stack design and testing for application in portable and auxiliary power units." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2016. http://hdl.handle.net/2108/201815.

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Fuel cells are very promising technologies for efficient electrical energy generation. They can be used for a wide range of applications, such as auxiliary power units (APUs), portable, automotive and stationary devices. The concept of a direct methanol fuel cell (DMFC) is based on the direct feed of a methanol solution to the fuel cell anode, thus simplifying safety, delivery, and fuel distribution issues typical of conventional hydrogen-fed polymer electrolyte fuel cells. In this thesis work, simple and functional stack designs were developed for direct methanol fuel cells (DMFCs)

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Pichonat, Tristan. "Etude, conception et réalisation d'une pile à combustible miniature pour applications portables." Phd thesis, Université de Franche-Comté, 2004. http://tel.archives-ouvertes.fr/tel-00010710.

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Ce travail s'inscrit dans le domaine des piles à combustible miniatures destinées aux applications portables (téléphones, assistants électroniques) et consiste dans la réalisation d'une pile complète (assemblage électrodes – membrane) de type PEMFC. L'usage du silicium pour la fabrication de la pile permet l'utilisation des technologies liées au silicium et un couplage facilité avec d'autres composants électroniques. La membrane de la pile est faite de silicium microporeux traité pour assurer la conduction protonique. Deux voies ont été explorées : imprégnation par un ionomère de type Nafion®

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Carmona, Sanchez Jesus. "A smart adaptive load for power-frequency support applications." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/a-smart-adaptive-load-for-powerfrequency-support-applications(043dde9b-b753-4a6a-9c41-4c93b34681f9).html.

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At present, one of the main issues in electric power networks is the reduction in conventional generation and its replacement by low inertia renewable energy generation. The balance between generation and demand has a direct impact on the system frequency and system inertia limits the frequency rate of change until compensation action can be undertaken. Traditionally generation managed frequency. In future, loads may be required to do more than just be able to be switched off during severe under frequency events. This thesis focuses on the development and practical implementation of the contro

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Nuttall, Daniel Robert. "Advanced high frequency switched-mode power supply techniques and applications." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/advanced-high-frequency-switchedmode-power-supply-techniques-and-applications(5792cb86-58e3-488b-b27e-559c18e55250).html.

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This Thesis examines the operation and dynamic performance of a single-stage, single-switch power factor corrector, S4 PFC, with an integrated magnetic device, IM. Also detailed isthe development and analysis of a high power light emitting diode, HP LED, power factorcorrection converter and proposed voltage regulation band control approach.The S4 PFC consists of a cascaded discontinuous current mode, DCM, boost stage anda continuous current mode, CCM, forward converter. The S4 PFC achieves a high powerfactor, low input current harmonics and a regulated voltage output, utilising a singleMOSFET.

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Stamford, Laurence James. "Life cycle sustainability assessment of electricity generation : a methodology and an application in the UK context." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/life-cycle-sustainability-assessment-of-electricity-generation-a-methodology-and-an-application-in-the-uk-context(e4d76ed6-7247-4435-81db-505895067dd0).html.

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This research has developed a novel sustainability assessment framework for electricity technologies and scenarios, taking into account techno-economic, environmental and social aspects. The methodology uses a life cycle approach and considers relevant sustainability impacts along the supply chain. The framework is generic and applicable to a range of electricity technologies and scenarios. To test the methodology, sustainability assessments have been carried out first for different technologies and then for a range of possible future electricity scenarios for the UK. The electricity options c

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Liu, Qiang. "Electrical performance of ester liquids under impulse voltage for application in power transformers." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/electrical-performance-of-ester-liquids-under-impulse-voltage-for-application-in-power-transformers(3702b3a2-ec5f-4674-ab11-1032906e8c0c).html.

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Ester liquids including both natural ester and synthetic ester are being considered as potential alternatives to mineral oil, due to their better environmental performance and for some liquids their higher fire point. Although these liquids have been widely used in distribution and traction transformers, it is still a significant step to adopt ester liquids in high-voltage power transformers because the high cost and severe consequence of a factory test failure and the high level of safety and reliability required in service for these units, tend to lead to a cautious approach to any step chan

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Murillo, Carrasco Luis. "Modelling, characterisation and application of GaN switching devices." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-characterisation-and-application-of-gan-switching-devices(a227368d-1029-4005-950c-2a098a5c5633).html.

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The recent application of semiconductor materials, such as GaN, to power electronics has led to the development of a new generation of devices, which promise lower losses, higher operating frequencies and reductions in equipment size. The aim of this research is to study the capabilities of emerging GaN power devices, to understand their advantages, drawbacks, the challenges of their implementation and their potential impact on the performance of power converters. The thesis starts by presenting the development of a simple model for the switching transients of a GaN cascode device under induct

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Ibarra, Medina Juansethi Ramses. "Development and application of a CFD model of laser metal deposition." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/development-and-application-of-a-cfd-model-of-laser-metal-deposition(d74829d8-c4b9-40f1-b80f-cbdc456ffaf5).html.

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Laser metal deposition is one of the most versatile methods in the expanding field of additive manufacturing. Its outstanding advantage is its capability to process a variety of metallic materials for the freeform fabrication of objects having sound mechanical properties. The process is used in applications of rapid manufacturing, components repair and surface coating. During recent years, modelling has been increasingly used to study and improve the laser metal deposition process. However, most models have focused on analysing individual stages of the deposition process and thus have not thor

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Weston, Laura. "Computational characterisation of organic molecules for electronic applications and an experimental study of cocrystals for electronic devices." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/computational-characterisation-of-organic-molecules-for-electronic-applications-and-an-experimental-study-of-cocrystals-for-electronic-devices(0d1a24ea-3241-40cf-bafa-6be179ba4c26).html.

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A range of small molecules of interest for use in organic semiconductor devices were studied computationally. Trends in geometry, absorption spectra, molecular orbitals, electrostatic potentials, reorganisation energies were studied. Results suggest that, as with acenes, the performance of non-linear cata-condensed polyaromatic hydrocarbons improves as number of fused benzene rings increases. The torsion in these molecules did not appear to have a large impact on the conjugation across the core and little effect on the absorption spectra, although it did affect the reorganisation energies on w

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23

Stewart, Gareth William David. "Word and power : a critical evaluation of the compatibility of the theology of John Wimber with reformed principles, for possible application to the life and witness of Presbyterian congregations." Thesis, Bangor University, 2012. https://research.bangor.ac.uk/portal/en/theses/word-and-power--a-critical-evaluation-of-the-compatibility-of-the-theology-of-john-wimber-with-reformed-principles-for-possible-application-to-the-life-and-witness-of-presbyterian-congregations(a4a1a597-dc70-42a3-be74-54979dd6eb31).html.

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This thesis discusses the contribution made by John Wimber to the theology of evangelism, discipleship and ministry. These contributions are contextually placed within a Reformed congregation that is part of a Confessional Presbyterian Denomination. While it does not address specifics with one congregation, the principles aim to be applicable to all such congregations. It seeks to challenge the accepted attitudes toward evangelism, the integration of new converts into the Church through discipleship, and the release of these converts into some form of ministry. This thesis argues for a re-eval

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Antonysamy, Alphons Anandaraj. "Microstructure, texture and mechanical property evolution during additive manufacturing of Ti6Al4V alloy for aerospace applications." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/microstructure-texture-and-mechanical-property-evolution-during-additive-manufacturing-of-ti6al4v-alloy-for-aerospace-applications(03c4d403-822a-4bfd-a0f8-ef49eb65e7a0).html.

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Additive Manufacturing (AM) is an innovative manufacturing process which offers near-net shape fabrication of complex components, directly from CAD models, without dies or substantial machining, resulting in a reduction in lead-time, waste, and cost. For example, the buy-to-fly ratio for a titanium component machined from forged billet is typically 10-20:1 compared to 5-7:1 when manufactured by AM. However, the production rates for most AM processes are relatively slow and AM is consequently largely of interest to the aerospace, automotive and biomedical industries. In addition, the solidifica

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Trescases, Olivier. "Integrated power-supplies for portable applications." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=742332&T=F.

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Chen, Chu Yan, and 陳昭陽. "Low-Power Operational Amplifier Design For Portable Product Applications." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/59188718567479897166.

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碩士<br>中華大學<br>電機工程學系碩士班<br>92<br>This study presents a low-power CMOS operational amplifier (OP). The rail-to- rail input stages are used to increase the range of input common-mode voltage and the cascode architecture is utilized to increase the gain of the amplifier. The rail-to-rail output voltage can be achieved using the class-AB output stages, and the current consumption of this OP is minimized using the weak-inversion biasing design. A bias circuit including a start-up circuitry is designed to provide a stable bias current for the OP to build up the operating points that are insensitive

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(9154769), Taylor B. Groom. "Development of Hydrogen-Based Portable Power Systems for Defense Applications." Thesis, 2020.

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<p>This dissertation describes the design and characterization of a lightweight hydrogen reactor coupled to a proton exchange membrane fuel cell for portable power delivery. The system is intended to recharge portable batteries in the absence of an established electrical power supply. The presented work can be divided into two endeavors; the first being an investigation of various hydrogen generation pathways and the second being the design, fabrication, and testing of a system to house hydrogen generation and deliver electrical power.</p> <p>Two hydrogen storage materials are considered for

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Liu, Wei-Pin, and 柳為彬. "Design of Low Dropout Regulator for Portable Power Management Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/14791934755955129107.

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碩士<br>中原大學<br>生物醫學工程研究所<br>100<br>With the progress of technology, the demand of portable electronic devices are increasing. In order to provide an operation voltage for the internal subsystems of the portable electronic devices, the conversion of the power regulator IC are required. Based on different power specifications of the subsystems required, causing excessive power consumption, the internal temperature rising, lower conversion efficiency, and then affecting the battery lifetime and reducing system standby time that will make the internal system can't be normal operation in portable el

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Chang, Ying-Da, та 張英達. "Low Power VCO-Based ΔƩ Modulator for Portable Bio-Medical Applications". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/37263591388686510815.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>101<br>Aging population and growing chronic patients are becoming urgent things to be resolved. Patient-centered medical home is a solution to mitigate these impacts by the concepts of self-monitor, self-control, self-diagnosis, and self-treatment. In order to achieve these goals, convenient, flexible and portable circuit systems for bio-medical applications are researched popularly especially in the analog-to-digital converters (ADCs). Because ADCs are bridges of communication between the digital signal and the weak analog signal form nature world. This thesis pres

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Lin, Te-jun, and 林德潤. "Low Power Design and Realization of Audio Decoders for Portable Multimedia Player Applications." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/32859308043763259230.

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碩士<br>國立中正大學<br>資訊工程所<br>94<br>This thesis presents an low power design and realization of audio decoders for portable multimedia player applications. We take advantage of the software optimization to reduce CPU’s clock rate and consequently reach the low power design. In this thesis, we carry out our design on UniRISC and ARM7TDMI these two platforms. We also take a profile on the reference software to extract the distribution of computation complexity and then utilize software optimization to improve its efficiency to the part of the large proportion. We propose several kinds of methods that

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Chen, Tung-Chien, and 陳東杰. "Low Power Digital System and Architecture Design for Portable Multimedia and Implantable Neuroprosthetic Applications." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/33019949935444735512.

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博士<br>國立臺灣大學<br>電子工程學研究所<br>97<br>Because video services become popular on portable devices, power becomes the primary design issue for video coders nowadays. H.264/AVC is an emerging video coding standard which can provide outstanding coding performance, 25-45% bit-rate savings over MPEG4, and thus suitable for portable multimedia applications. Low power consumption is the first-class design issue for portable devices in which the power is limited. In addition, power scalability is also important because it enables such devices to tradeoff compression performance with power consumption accord

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"Low Power, High Throughput Continuous Flow PCR Instruments for Environmental Applications." Doctoral diss., 2013. http://hdl.handle.net/2286/R.I.20863.

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abstract: Continuous monitoring in the adequate temporal and spatial scale is necessary for a better understanding of environmental variations. But field deployments of molecular biological analysis platforms in that scale are currently hindered because of issues with power, throughput and automation. Currently, such analysis is performed by the collection of large sample volumes from over a wide area and transporting them to laboratory testing facilities, which fail to provide any real-time information. This dissertation evaluates the systems currently utilized for in-situ field analyses and

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Wang, Yung-Bin, and 王永斌. "The studies of DMFC Application to Portable Power Sources." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/74783342010520264461.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>94<br>In this thesis the experimental method is used to study the characteristics of a DMFC when a heterogeneous carbon fiber bipolar plate is applied to it. The first main study is about the effect of the different structures of the carbon fiber bunch on the fuel cell performance. Additionally, a high temperature hot-pressing process is performed to change the inner molecular structure so that the hydrogen ion can be blocked to avoid the lateral migration between two adjacent cells. Finally, the two techniques are applied to make our new portable DMFC stack. Th

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Lai, Nan-hung, and 賴南宏. "The Application Design of the Portable Backup Power Device." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94876109939100658271.

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碩士<br>國立勤益科技大學<br>電子工程系<br>99<br>This paper presents a mobile portable backup power. When the phone battery is dead, and external communications to be the case, it can be used to charge their cell phones. The portable backup power use lithium ion batteries as a source of energy because it has high energy density, low internal resistance, the number of long cycle times, low self-discharge rate advantages. In the portable power structure, it is divided into four parts, including the charging circuit architecture, MCU logic control unit, the discharge Boost loop, lithium battery protection unit.

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wu, zhao-cheng, and 吳昭呈. "A Low-Power AFE Amplifier for Portable Biomedical Signal Sensing Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53447442892441453853.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>97<br>In this paper, a low-power and low-noise CMOS analog front-end amplifier is presented in this work. An analog front-end amplifier circuit includes the instrumentation amplifier (IA), low-pass filter (LPF) and the gain stage. Required for portable systems demand, we propose a simplified chopper-stabilized differential difference instrumentation amplifier, it can effectively reduce the power and reduce the chip area. For the present EEG and ECG signal acquisition system, this work has the lowest power consumption and the smallest chip area. The circuit was pro

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Yung-ChiehFang and 方勇傑. "Design and Application of a Portable Power-Efficient Multi-Wavelength Optical Plethysmography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/55680280887788760450.

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博士<br>國立成功大學<br>電機工程學系<br>104<br>Providing an easiest way to gather the information on the complex blood components conveniently from a single finger in a short time, plethysmographs have always been a topic worthy of studies. For a long time, it has been hoped that physiological data collection could be so developed as to be conducted in a portable, wearable and simple manner. For these purposes, power consumption is a significantly important matter. This study began with a pulse oximeter, as it was possible to acquire the information on the peripheral blood (index finger) using this oximeter

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Quan, Li, and 權力. "Study on a-Si Gate Driver on Array with Low Power Consumption and Narrow Bezel Application for Portable Medium-size Display." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y79jtv.

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