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Relevant bibliographies by topics / High efficiency design / Dissertations / Theses

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Dissertations / Theses on the topic 'High efficiency design'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Lingwood, Christopher James. "High power high efficiency multiple-beam klystron design." Thesis, Lancaster University, 2010. http://eprints.lancs.ac.uk/76344/.

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This thesis investigated the design decisions and associated optimisation methods of a 1.3 GHz Multiple Beam Klystron (MBK) for use in the Compact Linear Collider (CLIC). In this regard refinements have been made both to the MBK design, and investigation and optimisation methods used. The high desired efficiency of 80% requires low perveance beams, to achieve the specification output power 20 beams are needed. The choice of cavity used in the interaction structure of a klystron has a large impact on its size and efficiency. To optimise this a number of possible cavity designs were produced and

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Hamakhan, Idres Azzat. "Design of high efficiency turbomachinery blades." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/618.

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Walsh, A. "An adaptive controller with high computational efficiency." Thesis, Coventry University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377572.

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4

Hsu, Allen Long. "Design of high efficiency Mid IR QCL lasers." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45832.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (p. 101-103).<br>The proposed research is a study of designing high-efficiency Mid-IR quantum cascade lasers (QCL). This thesis explores "injector-less" designs for achieving lower voltage defects and improving wall plug efficiencies through highly strain-balanced structures and minimized injector regions. This work contains experimental design work for testing and evaluating Mid-IR QCL performance, simulation work for verifying wavefunction a

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Brown, Andre D. (Andre Darnell) 1976. "The analysis and design of a high power, high-efficiency generator." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80055.

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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.<br>Includes bibliographical references (leaf 43).<br>by Andre D. Brown.<br>S.B.and M.Eng.

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6

Chadha, Raman. "Design of high efficiency blowers for future aerosol applications." Texas A&M University, 2005. http://hdl.handle.net/1969.1/5002.

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High efficiency air blowers to meet future portable aerosol sampling applications were designed, fabricated, and evaluated. A Centrifugal blower was designed to achieve a flow rate of 100 L/min (1.67 x 10^-3 m^3/s) and a pressure rise of WC " 4 (1000 PA). Commercial computational fluid dynamics (CFD) software, FLUENT 6.1.22, was used extensively throughout the entire design cycle. The machine, Reynolds number (Re) , was around 10^5 suggesting a turbulent flow field. Renormalization Group (RNG) ÃÂºÃ¢ÂÂÃÂµ turbulent model was used for FLUENT simulations. An existing design was scaled down to

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Bayliss, Roderick S. III. "Design, implementation, and evaluation of high-efficiency high-power radio-frequency inductors." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130679.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2021<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 111-112).<br>Radio-Frequency (RF) power inductors are critical to many application spaces such as communications, RF food processing, heating, and plasma generation for semiconductor processing. Inductors for high frequency and high power (e.g., tens of MHz and hundreds of watts and above) have traditionally been implemented as air-core solenoids to avoid high-frequency core

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Soares, Diogo Lopes. "Design of multidimensional compact constellations with high power efficiency." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11111.

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Fu, Wai-yuen, and 傅惠源. "A comprehensive approach to high efficiency light emitters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42841537.

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The Best MPhil Thesis in the Faculties of Dentistry, Engineering, Medicine and Science (University of Hong Kong), Li Ka Shing Prize,2008-2009<br>published_or_final_version<br>Electrical and Electronic Engineering<br>Master<br>Master of Philosophy

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Earick, Weston R. "DESIGN OF A HIGH-POWER, HIGH-EFFICIENCY, LOW-DISTORTION DIRECT FROM DIGITAL AMPLIFIER." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1155008919.

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11

Yahyavi, Mehran. "On the design of high-efficiency RF Doherty power amplifiers." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398236.

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Power amplifiers (PAs) are one of the most crucial elements in wireless standards becasue they are the most power hungry subsystems. These elements have to face an important issue, which is the power efficiency, a fact related with the output back-off (OBO). But the OBO depends on the kind of modulated signal, in proportion to the modulated signal peak-to-average power ratio (PAPR). The higuer is the data rate, the higer is the OBO, and consequently the lower is the efficiency. A low efficiency of PAs causes the waste of energy as heat. Furthermore, the trade-off between linearity and effic

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Peng, Huajun. "Design and fabrication of high efficiency organic light emitting diodes /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20PENG.

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Wang, Feiyu Rutledge David B. "Design and analysis of high-efficiency L-band power amplifiers /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-02182006-133932.

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14

Gachora, John Mburu. "Design of a four-phase switchmode high efficiency power supply." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34057.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.<br>Includes bibliographical references (leaves 65-66).<br>by John Mburu Gachora.<br>M.Eng.

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15

Canning, Timothy A. J. "Continuous mode high efficiency power amplifier design for X band." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/63772/.

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This thesis is focused on the investigation and implementation of novel techniques for the design of X band (8 - 12GHz) power amplifiers. One of the main topics is the expansion and novel implementation of continuous mode theory, with the intention of improving the bandwidth and efficiency of X band power amplifiers. This work builds upon the Class B/J continuous mode theory to incorporate cases where <[ZF0] 6= RL, not described by the original Class B/J theory, with a tool called the “clipping contour”. The clipping contour tool shows a graphical representation on the Smith chart of the bound

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16

Anderson, Graeme. "Design of high efficiency loudspeakers for use in fire alarms." Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/47542/.

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Much work has been carried out into the operation of loudspeakers for use in audio applications. This thesis examines loudspeaker operation from an alternative point of view. For use in fire alarms, the loudspeaker is required to produce as much sound power as possible at a particular frequency whilst being as efficient as possible. The moving coil loudspeaker is used as a starting point due to its widespread use. Many papers describing its operation are available and as such is a good loudspeaker with which to examine modelling techniques. An impedance model of the moving coil loudspeaker is

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Dominic, Jason. "Comparison and Design of High Efficiency Microinverters for Photovoltaic Applications." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78045.

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With the decrease in availability of non-renewable energy sources coupled with the increase in the amount of energy required for the operation of personal electronic devices there has been an increased focus on developing systems that take advantage of renewable energy sources. Renewal energy sources such as photovoltaic (PV) panels have become more popular due to recent developments in PV panel manufacturing that decreases material costs and improves energy harvesting efficiency. Since PV sources are DC sources power conversion stages have to be used in order to interface this power to the ex

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Dehghan, Nelo. "High resolution electric field probes with applications in high efficiency RF power amplifier design." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/73139/.

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The evolution of high power transistors has ultimately increased the complexity of their design, interaction and incorporation within microwave frequency power amplifiers. The requirement for high efficiency and high linearity for a wide band frequency by the consumer has put pressure on designers. Due to unexpected and unpredictable failures, device characterisation of the transistor in operational conditions is a highly valuable advantage. The proposed work will describe a non-intrusive, ultra-miniaturised, high resolution electric field probe system; with the capability of measuring relativ

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Srirattana, Nuttapong. "High-Efficiency Linear RF Power Amplifiers Development." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6899.

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Next generation mobile communication systems require the use of linear RF power amplifier for higher data transmission rates. However, linear RF power amplifiers are inherently inefficient and usually require additional circuits or further system adjustments for better efficiency. This dissertation focuses on the development of new efficiency enhancement schemes for linear RF power amplifiers. The multistage Doherty amplifier technique is proposed to improve the performance of linear RF power amplifiers operated in a low power level. This technique advances the original Doherty amplifier sche

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Huang, Qiang. "High efficiency top-emitting organic light-emitting diodes: design and fabrication." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1193677683674-43826.

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This thesis focuses mainly on the techniques to achieve high-performance top-emitting OLEDs, regarding device efficiency and lifetime for both non-inverted and inverted structures. It is thus organized as follows: In Chapter 2, the basic physics of organic semiconductor materials are reviewed, including the electronic properties of organic semiconductor materials, molecular excitations and their electronic transitions etc., which are believed to be critical for understanding of the work. Then, the general device physics of OLEDs are reviewed in detail, which includes almost every important ele

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21

Sana, Peyman. "Design, fabrication and analysis of high efficiency multicrystalline silicon solar cells." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15039.

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22

Almuhaisen, Abdullah. "A novel approach for wide band high-efficiency power amplifier design." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/32468/.

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Wireless communication systems require an efficient and broadband RF frontend. RF Power Amplifiers (PA) are the most critical component in the RF frontend and are considered the bottleneck in high efficient wideband transmitters. The research starts with an investigation of high efficient operation modes based on waveform engineering. The outcome of the research can be divided into two main parts: The first concerns an analysis of high efficient modes of operation. The second part builds on first part looking at the PA’s efficiency-bandwidth perspective to design a wide band high efficient PA.

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Zhang, Feng-Lin, and 張豐麟. "A High Efficiency and High Linearity Transmitter Design." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95xs3r.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>101<br>The conventional linear transmitter possesses the characteristic of trading the efficiency for linearity. When a non-constant envelope modulated signal with a high peak-to-average power ratio (PARR) goes into the transmitter, the transmitter has to request the power amplifier (PA) of power backing-off to keep the signal quality from degradation. In this scenario, the power back-off is going to decrease the PA efficiency for the linearity. In contrast to the linear transmitter, the envelope following transmitter is supplied by a voltage source that has a reg

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Kunlong, Zheng, and 鄭焜隆. "High Efficiency Charge Pump Circuits Design." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27677815017702342989.

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碩士<br>亞洲大學<br>光電與通訊學系碩士班<br>100<br>This paper proposed a bootstrapped type high-efficient charge pump circuit based on the Dickson charge pump in order to get a high output power and pump-efficiency. By using bootstrapped technique, it can increase both of pump-efficiency and power-efficiency. The proposed bootstrapped based charge pump can avoid the threshold voltage drop in conventional Dickson charge pump circuits and enable them to generate a higher output voltage. Simulation by using HSpice level 3 model shows that for conventional Dickson charge pump, it convert the input low DC-voltage

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KAO, CHIH-MING, and 高志明. "Design of High Efficiency Resonant Converters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/f95vfa.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>105<br>This thesis aims to design single-phase power factor correction function of the boost converter and resonant DC converter. The resonant converter allows the power transistors to operate at zero-voltage switching to reduce switching loss and increase the operating frequency of the converter. The latter will reduce the sizes of the resonant inductor, transformer as well as resonant capacitor, and thereby improve the efficiency. In addition, parameters for the magnetic component transformer and the external resonant inductor are designed to reduce core and copper

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Kang, Jyun-Jie, and 康竣傑. "Design of High Efficiency and High Linearity Power Amplifiers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/65906222230919548178.

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碩士<br>國立東華大學<br>電機工程學系<br>98<br>This thesis is focused on the research of the CMOS radio frequency (RF) power amplifiers (PAs) for Worldwide Interoperability for Microwave Access (WiMAX) and wireless local area network (WLAN) system applications. The first chapter describes the characteristic of WiMAX system. The following chapters introduce the design of power amplifiers. There are three PAs presented in this thesis. All PAs are implemented by using tsmc 0.18μm mixed signal CMOS process. The simulation tool is Agilent ADS 2008U2. The first one is a folded cascode PA for WLAN systems at 5.

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Lai, Yu-Sheng, and 賴育聖. "Design and Implementation of High Efficiency Converters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/41853332215129643858.

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碩士<br>國立中正大學<br>電機工程所<br>93<br>This thesis proposes a high step-up and a high step-down soft switching converters. With conventional PWM hard switching converters, there exist many drawbacks, such as high component stress, high loss at switching transition and serious EMI problems, which will limit their operation frequency and performance. According to reference, a family of soft-switching cells (SSCs) have been introduced. When SSCs combined with the conventional PWM converters, both main and auxiliary switches can achieve claming action and soft-switching features. In this thesis, synthesis

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Chun-Chieh, Chen, and 陳俊傑. "High Efficiency sleeve dipole Design for WiFi." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/u27use.

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碩士<br>亞東技術學院<br>資訊與通訊工程研究所<br>99<br>The past decade has seen a phenomenal growth in wireless communications. Wireless technology is permeating business and personal communications are across the globe, and the demand is driving the availability and performance to the new levels. WiFi(Wireless Fidelity) is the most common communication standard. In this research, which design coaxial sleeve dipole antenna array and the sleeve dipole antenna array by print circuit board for IEEE 802.11a/b/g, which operate frequencies are 2.45 GHz and 5.8 GHz. and the sleeve dipole antenna array by print circ

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Warmann, Emily Cathryn. "Design Strategies for Ultra-High Efficiency Photovoltaics." Thesis, 2014. https://thesis.library.caltech.edu/8489/1/EmilyWarmann_Thesis_2014.pdf.

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<p>While concentrator photovoltaic cells have shown significant improvements in efficiency in the past ten years, once these cells are integrated into concentrating optics, connected to a power conditioning system and deployed in the field, the overall module efficiency drops to only 34 to 36%. This efficiency is impressive compared to conventional flat plate modules, but it is far short of the theoretical limits for solar energy conversion. Designing a system capable of achieving ultra high efficiency of 50% or greater cannot be achieved by refinement and iteration of current design approache

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Chu, Yu-Hsien, and 朱育賢. "High-Efficiency Design of LLC Resonant Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23657062494546645211.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>96<br>The LLC resonant converter has the merit of fixed duty cycle operation. A combination of parasitic components, which includes the MOSFET output capacitance and the leakage inductance of the isolation transformer, produces a resonant action and reduces drain-source voltage prior to turn-on. Moreover, the switching loss is reduced relatively.Therefore, high efficiency operation of system is achieved.An experimental prototype of 115~264Vac input, 19V/4.73A output, the resonant converter full load efficient reaches 95.31%. The subject of this thesis is to analyze

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Ho, Yueh-Lung, and 何岳龍. "High Linearity and Efficiency Power Amplifier Design." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/42089715092950607828.

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碩士<br>國立中央大學<br>電機工程研究所<br>91<br>With the current expansion of the wireless communication industry,system integration has become a major trend to meet hallenges.Microwave circuits are used within RF section of wireless communication system.The power amplifier is controlled by the size,cost,and performance of the RF section,hence the power amplifier plays an important role in the wireless communication system. This thesis is major to design high efficiency and linearization MMIC (monolithic microwave integrated circuit)power amplifier.In the high efficiency MMIC power amplifier,the paper demo

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SHIH-HSIANG, LIN, and 林世祥. "High Efficiency Class-D Audio Amplifier Design." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/17599257173454224387.

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碩士<br>聖約翰科技大學<br>電子工程系碩士班<br>97<br>For the fast growing of electric products, the consumer electronic products are designed toward the direction of tiny and portable. Audio amplifiers are mass needed in these products. The major demands of the consumer products, for example, are: power dissipation, product volume, and heat radiation. The most important design parameter of these is power efficiency. Increasing the power efficiency, it not only lasts the Class-D amplifier battery lives, but also operates in an extra low operating temperature. This paper designs Class-D amplifies based on self-tu

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Chen, Kuan-cheng, and 陳冠丞. "High-efficiency high-voltage DC/DC step-down chip design." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/36796732916723368848.

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碩士<br>國立雲林科技大學<br>電子與光電工程研究所碩士班<br>101<br>In this thesis, it uses the process of TSMC 0.25 um CMOS HIGH VOLTAGE MIXED SIGNAL to complete a total of three wafers and be off the assembly line of TSMC through CIC. The wafers are as the following respectively: (a) low-dropout linear regulator. Measurement results show that the feature of low voltage drop allows the conversion efficiency is up to 98.5% when the input voltage and the output voltage of circuit are similar; (b) simple-switching buck converter. It uses relatively simple feedback circuit to complete PWM control, and measurement results

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Kuo, Chang-Jung, and 郭長榮. "Design of a High Efficiency and High PF LED Driver." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/15805217747161151020.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>96<br>LED is replacing the conventional lighting devices due to its dominant characteristics of low-energy consuming and long-life time. To increase the overall performances of a LED lighting module, a single-stage flyback converter was employed to implement the driving of the LED, and the LED driver has the characteristics of high power factor and high efficiency. In this thesis, a practical case was used as an example, the main circuit elements were designed according to the given specifications. Then, the circuit simulation tool, IsSpice Ver 8.1.11 , was

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Chen, Wei-an, and 陳偉安. "High Efficiency Light Pipe with Optical Structure Design." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/62335495606241532446.

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碩士<br>國立臺灣科技大學<br>光電工程研究所<br>100<br>In today's green buildings, there are several ways of using solar energy for lighting, one of which is to use a patio for direct lighting. Another is to use a Natural Light Guiding System to transmit Natural light for lighting applications. Using patio lighting will make a green building's structure restricted. Moreover, the Natural Light Guiding System uses fiber optics, which are not easy to use and not cheap, to transmit lighting. In order to improve the situation above, this paper comes up with a new Natural Light Guiding System, which inclues

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Lee, Che-Chen, and 李哲誠. "Design of High Efficiency Power Amplifiers and Oscillators." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99660511982519993414.

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碩士<br>國立中央大學<br>電機工程學系<br>102<br>This thesis discusses design of high power and high efficiency power devices for radio frequency, microwave and millimeter-wave (MMW) applications. The circuits are designed using laterally diffused metal oxide semiconductor (LDMOS) transistors and complementary metal oxide semiconductor (CMOS) process. First, based on the conventional class-E topology with reactance compensation technique, a few broadband power amplifiers and injection-locked oscillators are presented, using Freescale LDMOS transistors. The proposed circuits feature broadband, high efficiency

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Nien, Yingjen, and 粘英仁. "Design and Development of High Efficiency Battery Charger." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/64529644140065652539.

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碩士<br>中華科技大學<br>電子工程研究所碩士班<br>99<br>This paper discusses the high efficiency battery charger’s electrical characteristic and to find a better efficiency approach, then actually develop a battery charger .It can be proved the correspond data with the theoretical results. In the circuit of the battery charger, the use of output inductor and capacitor are very important factor which influence the key characteristics of the charger , wishing to improve the efficiency of the charger, it shall to study the inductor or capacitor and choose the more appropriate components, as well as a more appropriat

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曾國境. "Design of A Novel High Efficiency Power Converter." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/33200596745746631953.

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碩士<br>大葉大學<br>電機工程研究所<br>87<br>In recent years, there is a fast progress in power electronics technology. The main reason is the improvement in electrical components and the development of new magnetic material. For example, the manganese - zinc ferrite are used in high frequency power transformer and MPP ( Molybdenum Perm-alloy Powder ) are used in the power inductor ( choke ) to reduce core loss; Ceramic material are used in PCB for better heat dissipation. High speed power transistors, such as MOSFET and IGBT ( Insulated Gate Bipolar Transistor ), IEGT ( Injection Enhanced Gat

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Liang, Chi-Tsung, and 梁繼宗. "Design of the High Efficiency LLC Power Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/pxv2jj.

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碩士<br>崑山科技大學<br>電子工程研究所<br>96<br>This thesis presents an output-current ripple reduction method for LLC resonant converter. Based on soft-switching, high efficiency and low electromagnetic interference, LLC resonant converter has been widely used for high switching frequency power conversion applications. However, the high output ripple current is the main drawback. Besides, for the large output current ripple of LLC resonant converter, the large output capacitance is necessary to reduce output current ripple for the high quality DC output voltage. In order to solve this problem, a current sha

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"High Efficiency Design Techniques for Linear Power Amplifiers." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15875.

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abstract: This thesis describes the design process used in the creation of a two stage cellular power amplifier. A background for understanding amplifier linearity, device properties, and ACLR estimation is provided. An outline of the design goals is given with a focus on linearity with high efficiency. The full design is broken into smaller elements which are discussed in detail. The main contribution of this thesis is the description of a novel interstage matching network topology for increasing efficiency. Ultimately the full amplifier design is simulated and compared to the measured result

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TSAI, BO-YU, and 蔡博宇. "Design of High Efficiency Confocal Paraboloid Optical Coupler." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f375zs.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>This study proposes a set of high-efficiency optical coupler design methods that can be used to collect multiple light sources for compression and integrate them into one light source outlet. It adopts parabolic confocal principle and high reflectivity coating and completes the structural design with the formulation concept. In addition to direct sunlight collection, the optical coupler is also coupled to the exit source of the collection subsystem of natural light illumination system(NLIS). The concept of NLIS is to collect sunlight and direct it into indoor

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CHEN, WEN-CHENG, and 陳玟澄. "Low Cost - High Efficiency Inverter Design and Implementation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/61758684996047833217.

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碩士<br>明新科技大學<br>電機工程研究所<br>101<br>This thesis intends to design and realize a high-efficiency, low-cost, low to medium power frequency inverter based on the soft switching technique with low-priced PWM control ICs. To transform DC voltages to AC voltages and currents with a 60-Hz sinusoidal-wave needed for the load, the front-end stage of the converter adopts the zero-voltage-switching/zero-current-switching LLC resonant full-bridge PPM converter architecture and the back-end stage uses the single-phase full-bridge frequency converter architecture. The converter is not only designed to satisfy

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Yu, Yi-Chang, and 余宜璋. "High Efficiency Design for Converters under Light Load." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/63149190705414978964.

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碩士<br>國立中央大學<br>電機工程學系在職專班<br>104<br>This thesis aims to study and solve the power supply efficiency problem that occurs during non-optimization usage. The power supply design was built for full load power, however most of the time the power contained in the operation is light load or middle load. For example, a PC 500W power supply often operates at 130 ~ 250W. Therefore, if the power supply is not running at or near full capacity, the level of efficiency is not satisfactory. To solve the light load and the middle load issues, designers generally use mutation mode control to reduce switching

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Tsai, Fang-Hsu, and 蔡芳旭. "High efficiency image scaling and hardware architecture design." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/20761384613354447197.

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碩士<br>元智大學<br>電機工程學系<br>105<br>Image scaling is a technique that widely used in electronic products with display device on them, such as digital camera, smart phone, tablet, and medical application like endoscopy. With the trend of high resolution display development, the duration times between generations become shorter and shorter. Nowadays, the mainstream of display 1080p resolution for LCD/LED TV has been advanced from Full HD (1,920 x 1,080) to 4K UHD (3,840x2,160). Furthermore, the next generation of 8K-UHD (7,680 x 4,320) display has become the next advanced display resolution. However,

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Xin-XianTang and 唐信賢. "High Efficiency Antenna Design for Low Altitude Flights." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/72597104090669522231.

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LIN, YI PING, and 林奕萍. "Design of novel nanoparticles with high transfection efficiency." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/42071981135562529749.

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碩士<br>國立臺灣大學<br>生物化學暨分子生物學研究所<br>91<br>Abstract Gene delivery systems are applied broadly in experimental study, but their clinical applications are still to be test-ed. Scientists are working hardly to develop an efficient and safe delivery system for gene therapy. At the present time, major gene delivery systems employ either viral or nonviral vectors. However, viral vectors have serious problems in safe and production concerns .Even though , nonviral vectors do not have good efficiency as viral vectors did, scientists are fo-cusing on the improvement of nonviral vectors to achie

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Shih-MingChen and 陳世明. "Analysis and Design of High-Efficiency High Step-Up DC Converters." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/17899150136469424874.

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Hsieh, Chih-Chung, and 謝志忠. "Design of high power, high efficiency and high linearity power amplifier and switch." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/92257n.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>98<br>As the rapid development of mobile communication, many applications make use of wireless communication to carry their works out. The radio frequency power amplifier is a key component for wireless communication systems. Since it consumed the power more than half of entire device. Moreover, the output power will decide the communication distance, power added efficiency will decide the degree of the power consumption, i.e., the idle time of the device. In the applications of high efficiency power amplifier, the Doherty power amplifier not only has a simple

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Wang, Zou-Fu, and 王柔富. "Design and Implementation of High efficiency and High Power Factor Flyback converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02928136839118236706.

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碩士<br>雲林科技大學<br>電機工程系碩士班<br>97<br>This thesis presents the flyback converter with active power factor corrector technique to achieve the three characteristics of the ideal LED lighing , 1. high power factor 2. constant voltage 3. constant current . Generally, in order to improve the power quality, a high power factor correction circuit is necessarily needed. However, the power efficiency of high power factor correction converters is not high. Notably, it reveals from experimental results that the APFC (active power factor corrector) flyback converter exhibits the power factor of 0.9 and power

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Shu-HsiuPan and 潘淑秀. "Design and Implementation of High Efficiency Driving Circuit for High Brightness LEDs." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/67640014736107193347.

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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>101<br>This thesis focuses on the design and implementation high efficiency driving circuit for DC high brightness LED.At first, the electric and optical characteristics of high brightness LED are analyzed and measured with different methods. In order to operate the high brightness LED on high luminous efficiency continuously, this drive circuit is selected appropriate drive current by temperature change of DC LED. The circuit is utilized to drive DC LED, and the temperature of DC LED is controlled by used cooling chip on steady state. The electric and optical cha

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