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Svystun, Serhii, i Сергій Сергійович Свистун. "Secondary power supply". Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50165.
Pełny tekst źródłaIn the era of modern technologies, people can’t live without electronic devices, even a few days. At the moment, phones are commonplace, something we are used to. Every morning we get up and look at the charging rate of our smartphone. So let's analyze the simplest secondary power source - a phone charger.
В епоху сучасних технологій люди не можуть жити без електронних пристроїв, навіть кілька днів. На даний момент телефони - звична справа, до чого ми звикли. Щоранку ми встаємо і дивимось на швидкість зарядки нашого смартфона. Тож давайте проаналізуйте найпростіше вторинне джерело живлення - зарядний пристрій для телефону.
Mills, Carlo Juan. "Supply-friendly single phase uninteruptible power supply". Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/16095.
Pełny tekst źródłaUninterruptible power supplies (UPS) maintain a constant supply of power to a critical load. The distinguishing features are a fixed voltage and frequency, low harmonic content and the ability to supply the load for a period of time after the incoming supply has failed. The document begins by identifying the typical power-line disturbances and their effect on various types of equipment. Together with the power conditioners used to suppress these disturbances, various UPS standby, line-interactive and on-line configurations are introduced. Next, the possibility of modifying a locally manufactured UPS to meet the design specifications is investigated. The performance of the system under load is evaluated, and forms the basis for the following decision. Due to the large number of modifications required and the inflexibility of local UPS topology, an alternative topology is adopted. In the new topology a power factor corrector, constructed around a DC to DC boost converter, interfaces with the incoming AC line. It delivers a half sinusoidal current into the DC bus. An IGBT inverter using sinusoidal unipolar pulse-width modulation regenerates the AC load voltage after filtering through a LC-filter. The DC bus voltage ripple is reduced by synchronising the inverter load and power factor corrector current while the battery pack maintains the DC bus during a power failure. The power factor corrector employs a dedicated analogue controller chip while a MCS-51 microcontroller generates the inverter PWM, provides the remote monitoring facilities, battery charging and performs general support tasks. The total harmonic distortion of the input current is measured at less than 4% while the power factor remained above 0.99 over the entire load range. The ripple regulator reduced the DC bus voltage ripple without any noticeable effect on the load. Under maximum load, the steady state output voltage is maintained during the -20%, +10% variation in the incoming line voltage. However, the transient response fails to meet the 5% design specification. A 0-100% load step results in a 7% drop in the output voltage while the loss of the load results 10% jump in voltage. System efficiency is measured at 85%. It is the lack of processing power, precluding the use of floating point or an optimal control algorithm, which ultimately compromises the performance of the system. It is recommended that the microcontroller be replaced with a 16-bit processor or digital signal processor to provide the extra computational power needed to optimise the UPS response. To improve the voltage regulation, it is recommended that the control include an inner current loop while the switching frequency should be increased to reduce the energy storage in the output filter. Further adjustments and refinements to the topology are suggested in the final chapter.
Eireiner, Matthias. "Power supply integrity in low power designs". Aachen Shaker, 2009. http://d-nb.info/99845642X/04.
Pełny tekst źródłaBeikoff, Geoffrey Noel. "A high power, high voltage switching power supply". Thesis, Queensland University of Technology, 1992. https://eprints.qut.edu.au/36226/1/36226_Beikoff_1992.pdf.
Pełny tekst źródłaKirby, Brenden. "Power Supply to Mobile Device". Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-39828.
Pełny tekst źródłaMedan teknik utvecklas blir många bärbara enheter batteridriven. Dessa enheter är bland oss och är ovillkorligen en del av dagens samhälle. Användningen och omgivningen av dessa enheter kan variera beroende på avsedd funktionalitet och syfte. Varierande miljöförhållanden kan påverkar laddningsmetoden för dessa enheter. Denna rapport omfattar utveckling och genomförande av ett kretskort. Kretskortet kommer att användas som prototyp för framtida testning för en bärbar enhet som företaget VectorizeMove [1] utvecklar. Kretskortet innehåller flera laddningsmetoder och ett spänningsregleringssystem. Laddningsmetoderna inkluderar induktiv laddning och micro USBladdning. Laddningssystemen är konstruerade för ett litium polymer batteri som laddas genom olika faser som förhindrar skador på batteriet. Spänningsregleringssystemet implementeras för att testa och säkerställa en stabil spänningsutgång för komponenterna som ingår i företagets enhet.
Pan, Haibo 1973. "SMES for power quality improvement and uninterruptible power supply". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33342.
Pełny tekst źródłaThe PQ/UPS SMES system as well as the power network has been modeled using Matlab/Simulink simulation environment for convenience. The Simulink models of all relevant components are also presented. Finally, all the evaluation tests are also done in Simulink simulation environment.
Eireiner, Matthias [Verfasser]. "Power Supply Integrity in Low Power Designs / Matthias Eireiner". Aachen : Shaker, 2009. http://d-nb.info/1159834733/34.
Pełny tekst źródłaIbishukcu, Ozlem, i Aniket Datar. "Maintaining Power Relations in Supply Chain". Thesis, Högskolan i Jönköping, Internationella Handelshögskolan, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30335.
Pełny tekst źródłaWang, Jing. "Power supply noise in delay testing". [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1428.
Pełny tekst źródłaSamaha, Melhem 1977. "Privatization of power supply in Lebanon". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/47912.
Pełny tekst źródła"February 2002."
Includes bibliographical references (leaf 108).
Plagued by corruption, illegal connections, mismanagement, and more than $300 million in annual deficit, Electricite du Liban (EDL), the vertically integrated government owned Power Company, has become a financial burden on the Lebanese public sector. The following paper proposes a strategy for its privatization. We first start by exposing the relevant characteristics of the country, the current socio-economic situation and the factors that have led to the recent calls for privatization. We then focus our discussion on the power sector and on EDL, identifying the problems that have undermined its operations. The second part of the paper tries, based on an overview of three case studies, to define the different market models available and the requirements, strengths and weaknesses of each model. Finally, based on the country's and sector's specificities, we recommend a two-phase privatization strategy that calls for a corporatization and restructuring transitional phase preceding a limited form of wholesale competition.
by Melhem Samaha.
S.M.
Moskalenko, M. M., i V. V. Dulya-Borzenec. "Autonomous power supply for safety systems". Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/49068.
Pełny tekst źródłaHassan, Amal M. "Power Supply Solutions for Modern FPGAs". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338433937.
Pełny tekst źródłaWildrick, Carl M. "Stability of distributed power supply systems". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07112009-040311/.
Pełny tekst źródłaPholboon, Seksak. "A resonant power converter for DC magnet power supply applications". Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606098.
Pełny tekst źródłaShafik, Ziyad M. "Toroidal field power supply for the spherical tokamak power plant". Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=15658.
Pełny tekst źródłaChan, Weng Hong. "Harmonic reduction and power factor correction in low power supply system". Thesis, University of Macau, 2002. http://umaclib3.umac.mo/record=b1445817.
Pełny tekst źródłaTan, Benjamin H. "A Novel Arc Welding Power Supply with Improved Power Factor Correction". DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2199.
Pełny tekst źródłaRye-Florentz, Carl Gustaf. "Electrical Power Supply for Military Ground Troops". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8563.
Pełny tekst źródłaGutnik, Vadim. "Variable supply voltage for low power DSP". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/36088.
Pełny tekst źródłaSong, Jian, Ni Luo, Liu Cao i Min Xu. "An Evaluation System for Airplane's Power Supply". International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596441.
Pełny tekst źródłaPower supply is the most critical unit in an airplane. A defect in a power supply might lead to a crash. Therefore, it is very useful and important to monitor the status of the airplane's power supply during flight. This paper presents a real-time evaluation system constructed by a central process unit for processing and detecting defects and several remote units for acquiring parameters. Because of the huge amount of data acquired, a combination of Ethernet and time division multiplexing technique has been applied for constructing a 2.5Gbps synchronous data transportation network for the system.
Andersson, Johan, i Adam Schelander. "Design and verification of automotive power supply". Thesis, Linköpings universitet, Fysik och elektroteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150147.
Pełny tekst źródłaLi, Yi. "Wireless power supply for ambient assisted living". Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387371/.
Pełny tekst źródłaSingh, Anjali. "Asymmetrical Power Relationships in Supply Chain Networks". Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42495.
Pełny tekst źródłaSmilek, Jan. "Energy Harvesting Power Supply for MEMS Applications". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-386765.
Pełny tekst źródłaGuigue, Etienne. "Market Power and Frictions in Supply Chains". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAG009.
Pełny tekst źródłaThis dissertation aims to better understand the role of market power and competition frictions between suppliers and buyers in intertwined global and national supply chains. This research leverages empirical and theoretical tools applied to the French dairy industry and French manufacturing importers.Chapter 1 suggests a new methodology to separately estimate firm buyer and seller power, which is important for policy-making but challenging, and apply it to French dairy processors. These firms exert buyer power when purchasing raw milk, and seller power when marketing dairy products. The analysis is based on plant-level data on dairy firms, with observations on prices and quantities of raw-milk input by origin and output by product from 2003 to 2018. Total margins are estimated relying on a production function approach. The existence of a commodity, (i) substitutable as an input or as an output, and (ii) exchanged on global markets where firms are price-takers, then allows separately estimating firm-origin markdowns and firm-product markups. The methodology can also be useful in other contexts, with more limited data. Markdown estimates imply that dairy firms on average purchase raw milk at a price 16% below its marginal contribution to their profits, while markup estimates indicate that firms sell dairy products at a price exceeding their marginal costs by 41%. This chapter also analyzes how exogenous farmer and processor cost shocks pass through the supply chain. Processors partially absorb such shocks by adjusting markups and markdowns, thus smoothing variations in farmer revenues. It further implies that 65% of subsidies are currently diverted from farmers due to processor buyer power.Chapter 2 analyzes the impact of production quotas and their progressive removal in the French milk market, showing that production quotas generated two types of distortions. First, by mechanically fixing production shares across French départements at their pre-quota (1984) level, quotas stopped a natural spatial concentration for about 25 years, a process that restarted right after the start of the progressive quota removal in 2008. Second, the design of the quota system spurred the growth of small farms while constraining the expansion possibilities of larger farms. This redistributive scheme thus successfully refrained inequalities among farms growing until then, yet at the cost of distorting the competition-led cream-skimming of farms. Results finally show how the catching-up process in farm selection following the quota removal intervened more or less early across départements, depending on the stringency implied by quota constraints at the local level. These observations are rationalized with a simple model of perfect competition between heterogeneous farms.Chapter 3 quantifies buyer power in input trade and evaluates its aggregate effects. The developed empirical strategy for estimating importer buyer power from standard trade and production data does not rely on assumptions about other input markets. The results show that French manufacturing firms exert an average markdown of 1.49 on imported inputs and of 1.59 on domestically purchased inputs, revealing their significant buyer power in both markets. The welfare implications are then explored using an equilibrium model
Smyth, Thomas Paton. "A review of the emergency electric power supply systems at PWR nuclear power plants". Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/22430.
Pełny tekst źródłaThe Emergency Electric Power Supply Systems at Pressurized Water Reactor Nuclear Power Plants are reviewed, problem areas are identified, and recommendations are made for existing and future Nuclear Power Plants. A simplified introduction to a typical Pressurized Water Nuclear Reactor is given and the problems associated with the commercial use of nuclear power are discussed. An overview of the Nuclear industry's solutions is presented and covers the Reliability of equipment and the American Regulatory requirements. The alternating and direct current power supply systems are examined in terms of plant operational state and equipment type (Diesel generators, Grid network, Lead-acid batteries, Battery chargers, Inverters, and Power Distribution networks). The trends in the design of Emergency Electric Power supply systems at Nuclear Power Plants are presented. The loss of all alternating current power, known as Station Blackout, is discussed and the American and European response to this. problem is presented. Problems experienced in the direct current systems are discussed and solutions are presented. The experience at Koeberg Nuclear Power station with Lead-acid batteries is included in the discussion. The thesis concludes with recommendations for designers and operators of the Electric Power Supply Systems at Nuclear Power Stations.
Camacho, Rojas Jorge Arturo. "Distributing power : a cratological study of emerging technologies for electric power supply". Thesis, University of East London, 2010. http://roar.uel.ac.uk/2601/.
Pełny tekst źródłaBiner, Dominik. "Power supply and motion system for planetary rover /". Sion, 2008. http://doc.rero.ch/record/10802?ln=fr.
Pełny tekst źródłaEidsaune, Christian. "Power Supply for Down-hole Instrumentation and Actuators". Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9052.
Pełny tekst źródłaTo create the ultimate wireless instrumentation unit for down-hole applications high temperature electronics with very high reliability is needed. It is possible to use ordinary bulk-CMOS devices at temperature up to 175 ⁰C, but the lifetime at these temperatures is to low for a down-hole instrumentation unit. An alternative is to use s Silicon on Insulator process under the fabrication of the semiconductors. The SOI process is a fabrication process where there is buried a oxide layer in the silicon wafer, and thus allowing higher breakdown voltage and/or lower current leakage. The low current leakage allows the semiconductors to be used at higher junction temperature. SOI devices that are commercial available off-the-shelf as a expected lifetime for at least 5 years at 225 ⁰C and thus much lower at junction temperatures below 200 ⁰C. The SOI technology can then be used together with hybrid circuits using ceramic substrate as a replacement for organic PCB and thick-film technology for the passive devices. A package like this gives a system with high reliability both toward high temperature operation and lifetime. The main limitation in the high temperature design is the availability off the larger capacitors; the limitation for high temperature stacked capacitors is 200 ⁰C. The converters designed are the standard step-up and step-down switch-mode power supplies. The converters are designed with current mode control; current mode control is used because of the advantage that comes with it. One off the advantages is the possibility to limit the inductor current; another advantage is the possibility to use constant current charging for the battery. When designing the SOI devices for high temperature operation it is difficult to achieve high enough breakdown voltage. With this in mind, the high temperature converter is designed with series coupled transistors to achieve high enough breakdown voltage for high voltage operation. The transistors have always some small perturbations in their specifications, this has to be considered when connecting transistors in series. This perturbations in for example turn-off speed makes an uneven voltage sharing; this is solved by connecting suitable capacitors in parallel with the switches to maintain an even voltage sharing.
Tambatamba, Terence. "Improvement of power supply reliability : Case Study: Zambia". Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9854.
Pełny tekst źródłaThis thesis studied reliability of power supply in Zambia following two major power blackouts that affected the whole country. The case study focussed on the generation and transmission network owned by Zambias biggest utility company Zesco. Three methods of study were selected. The first method looked at the transient stability simulations of Zesco generators when subjected to a large disturbance after a three phase short circuit was applied at three selected buses which are considered critical to the system. The simulations were carried out in SIMPOW. The results show that with fault duration of less than 200 milliseconds, all generators regained synchronism after fault removal. However, extending the fault duration to 200 milliseconds resulted in loss of synchronism in generators at Victoria Falls power station. The second method studied the contingency of some critical components in the Zesco system. The contingency analysis was implemented using software called NETBAS. Study showed that the Zesco system is N-1 stable for contingencies involving transmission lines and transformers. However the system is vulnerable to contingencies involving major power stations such as Kafue gorge and Kariba North bank. The third study proposed modification to the distance protection system to include the effect of zero sequence mutual coupling resulting from parallel circuits following a fault involving earth on a protected line. Adaptive techniques were developed where the settings of the distance relay would change to suit the circuit configuration. This technique resulted in optimal performance of the distance relay under all conditions of parallel line operation. The thesis concludes by making recommendations based on the findings from the studies carried out.
Zhou, Qinsheng. "Integrative Power Supply Solution for Future Generation Vehicles". Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-180331.
Pełny tekst źródłaMelkonyan, Ashot. "High efficiency power supply using new SiC devices". Kassel Kassel Univ. Press, 2006. http://www.uni-kassel.de/hrz/db4/extern/dbupress/publik/abstract.php?978-3-89958-302-1.
Pełny tekst źródłaLopez, Arevalo Saul. "Matrix converter for frequency changing power supply applications". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10477/.
Pełny tekst źródłaRamadass, Yogesh Kumar. "An energy optimal power supply for digital circuits". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37922.
Pełny tekst źródłaIncludes bibliographical references (p. 96-98).
The energy efficiency of digital circuits continues to be a major factor in determining the size and weight of battery-operated electronics. Integration of more functionality in a single system has made battery longevity a major problem. Operating 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 tracking based on the energy savings possible. A circuit that can dynamically track the MEP of a digital circuit with varying load conditions and temperature is presented. A low power, voltage scalable DC-DC converter is also embedded within the chip. The proposed minimum energy tracking algorithm uses a novel approach to sense the energy consumed per operation. The energy sensing circuitry does not use high-resolution Analog-to-Digital converters or high gain amplifiers. The energy estimate is used in a slope tracking algorithm to track the minimum energy operating voltage. The minimum energy tracking loop along with a low-voltage DC-DC converter and test circuitry were fabricated in a 65nm CMOS process.
(cont.) The circuits are powered from an external 1.2V supply. The digital test circuitry was capable of operation at voltages as low as 0.25V. The tracking of the minimum energy operating voltage with change in workload and temperature was observed. The DC-DC converter was able to deliver load voltages between 0.25V and 0.7V with an efficiency > 78% at load power levels of the order of 1 0.1W and above.
by Yogesh Kumar Ramadass.
S.M.
Madrigal, Ruben E. (Ruben Esteban). "Custom power supply interface for teaching circuit design". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91842.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (page 53).
This thesis discusses the design and implementation of a custom power supply interface for the Pioneer mobile robot used in MIT's 6.01 course, "Introduction to Electrical Engineering and Computer Science." The interface is a printed circuit board that provides bipolar voltage rails of +7VDC and -7VDC, expanding on its predecessor, which only provides a unipolar voltage rail of +1OVDC. The board is mounted internally to the robot and can power the student breadboard circuits via the bipolar voltage rails. This redesigned power supply interface will help the course staff teach students about circuit design in a much simpler context and allow students to focus more on engineering different circuits rather than spending time on tangential problems.
by Ruben E. Madrigal.
M. Eng.
Leng, Tian Duo, i 冷天鐸. "Power-factor-corrected switching power supply". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/68470288347342661341.
Pełny tekst źródłaHuang, Zih-Wei, i 黃子維. "High-power Laser Switching Power Supply". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5654ca.
Pełny tekst źródła國立中央大學
電機工程學系
106
The intensity of the laser is controlled by adjusting the magnitude of the input laser diode current. Therefore, it is the purpose of this thesis to design a power supply with adjustable current for the laser. Through the architecture design of the power supply, the energy conversion efficiency is improved, the volume of the power supply module is reduced, and three sets of independent laser machines can be simultaneously provided with a stable and adjustable current source. In the system architecture of this thesis, a power factor correction circuit, a phase shift full bridge conversion circuit, and a buck converter are included. The boost power factor correction circuit uses a model UCC28180 control chip manufactured by Texas Instruments, with the input AC voltage range of 100 to 240 V and the output voltage to a phase-shifted full-bridge conversion circuit is DC 390 V. The phase-shifted full-bridge conversion circuit uses a model UCC3895 control chip manufactured by Texas Instruments, and uses a phase shift technique to achieve a zero voltage switching flexible technology. The PI controller in the buck is composed of an operational amplifier to form an analog controller, which can adjust a single independent output current between 21.6 and 32A.
CHENG, SHENG-XIAN, i 陳聖賢. "Distributed resonant power supply". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/62854260314308645021.
Pełny tekst źródłaBoost, Mike. "High performance medium power uninterruptible power supply". Thesis, 1990. http://spectrum.library.concordia.ca/3413/1/NL56078.pdf.
Pełny tekst źródłaCheng, Chieh-yin, i 鄭介尹. "Design of Programmable Power-Quality Power Supply". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/ub94gr.
Pełny tekst źródła國立中央大學
電機工程學系
103
This thesis is to describe the design process and methods of a programmable power-quality power supply. The main purpose is to design an AC power supply, but it can editing an arbitrary output voltage waveform through a programmable program not only the general common sinusoidal output voltage waveform. The alternating current with arbitrary waveform can be used to emulate a power supply of pollution with power harmonics, flicker, sags, swells and other disturbances. They can be used as a reference simulate power source when we are designing a power source filter or can be used to test equipment for power pollution interference. Power-quality power supply rated output power given here is 500 VA, which is mainly use of class-D power amplifier as the main body. The stage before class-D power amplifier is a boost circuit which used to rise the input voltage. Input voltage of the class-D power amplifier is output voltage of the boost circuit. Programmable signal and user interface are edited by the LabVIEW software, and the signal DAC output through myDAQ which input to the microcontroller dsPIC30f4011 for the PWM control of switching elements in the system. Finally, coupled with hardware circuits, software and firmware to complete the overall structure and function. Sine wave output voltage of the system up to R.M.S. value 120V. In the part of harmonic waveform output voltage can be added multiple sets of arbitrary frequency, amplitude harmonic components. The highest harmonic frequency up to 2kHz. In the part of flicker output voltage waveform can be added multiple sets of arbitrary frequency, amplitude flicker component. The minimum flicker frequency up to 1Hz. In the part of swells, sags, interrupts waveform output voltage can be set that voltage fluctuation occur at any times, and can do multiple sets of voltage fluctuation function.
Kuo, Yu-Chieh, i 郭毓介. "High power density of the vehicle power supply". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/33697613470071097936.
Pełny tekst źródła崑山科技大學
電子工程研究所
100
In this thesis two small thin car power adapter was explored. The isolated and non-isolated adaptor power rating was 80W and 95W respectively. The push-pull topology was used for isolated power converter order to satisfy thin design. The size of this power converter was 132 (L) * 60 (W) mm and thickness was 13 (H) mm. In non-isolated power converter, boost topology with synchronous rectification was utilized. The size of this power converter was 65 (L) * 47 (W) * 20 (H) mm.
Chang, Yu-Chen, i 張佑丞. "High Power Audio Amplifier with Variable Power Supply". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u285tg.
Pełny tekst źródła國立臺灣科技大學
電子工程系
105
Conventional audio power amplifiers are operating with fixed power supply. It means that the power losses caused by quiescent current are also fixed and regardless to output power. When power amplifier working in low power condition, the voltage across power devices will be larger than high power condition such that the losses on power devices increase. This dissertation presents an audio power amplifier with variable power supply controlled by input audio signal. In low-power output condition, the power supply will provide low voltage to reduce the power loss on power transistors and improve circuit efficiency. The power supply voltage of power amplifier can be controlled by the audio input signal used as the reference of power converter. The amplifier system is divided into two parts: the audio power amplifier adopting an integrated amplifier driving circuit with class AB topology and the power supply implemented with a full-bridge phase-shifted converter.
Ahlström, Johan, i Edward Nordström. "PSQS – Power Supply Quality Simulator". Thesis, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-6848.
Pełny tekst źródłaKitron had wishes to be able to test and measure how disturbance affects their vehicle electronic units before they have been verified by SP Technical Research Institute of Sweden in Borås. This work started with the writing of a demand specification together with Kitron for a product PSQS, Power Supply Quality Simulator, which can generate some test pulses according to a standard for electronic units to Volvos vehicles. A design proposal was developed with the help the demand specification and was verified with the help of simulations. All electric schematics was designed with the guide of the design proposal. The pulses realized in the works of this thesis are those which Kitron experienced that they have a need to test in their own premises and which are possible to generate with the means available. All work took place at Kitron in Jönköping, the restriction of the work has been the cost of components not to be to high as well as the finished product shall be easily managed. This thesis work resulted in a unit which is possible to produce a number of disturbances on the voltage feed to a unit under test. Some pulses have not been completely correct according to Volvos standard. There are large possibilities to further develop PSQS to a unit that follows Volvos standard and even other vehicle producer’s standards.
Huang, Chang-Xin, i 黃常新. "Microprocessor-Based Uninterruptible Power Supply". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/6z365h.
Pełny tekst źródła崑山科技大學
電機工程研究所
92
The computer and communication products were widely spread recently. The power quality demanded of above products is higher than the conventional electrical products. However, the power quality of the utility is degraded due to the wide use of nonlinear load. The requirement of uninterruptible power supply (UPS) is increased. The cost is the most important factor in designing the small capacity UPS. The single chip microprocessor based UPS has the advantages of lost cast, high flexible and simplified circuit. Hence, the single chip microprocessor is widely used in designing the small capacity UPS. In this paper a microprocessor-based controller is developed for a low cost UPS.
周加昇. "Power supply automated test system". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8tg9vs.
Pełny tekst źródła聖約翰科技大學
電機工程系碩士在職專班
104
In this paper, power supply automated test system is designed by Labview software. The main purpose is to perform electrical tests of power supply by program, and to turn the test results into a relevant test report. This research has the following advantages: (1)decrease test time. (2) shorten test steps, improve test accuracy and reduce human errors.(3) set up the program conveniently. (4) the system provides operational history for debug.This paper has been proved by experience: under the same power supply test items, compared with manual test time, this automated system test time is reduced by 40%~50% approximately. It can make it convenient for tester schedule arrangements. The automation test system settings are simple; you only need to set up the relevant test conditions, then the system can perform the tests and automatically turn the results into a test report. In addition, the report provides a recording function for debug, so that testers can have the debug history for the relevant tests; successors can refer to the history, effectively avoiding the time of studying all over again. The automated test system has the advantages of standardizing tests, increasing productivity, and reducing costs. Currently, it has become a trend that automated tests are gradually replacing manual tests. In this paper, the Labview diagram-controlling program (which is based on diagram programming language) can let users perform device control and test data retrieving more quickly, compared with traditional character programming language.
V, Polishchuk A. "Power Supply on the Plane". Thesis, 2018. http://er.nau.edu.ua/handle/NAU/34694.
Pełny tekst źródłaChandorkar, Mukul C. "Distributed uninterruptible power supply systems". 1995. http://catalog.hathitrust.org/api/volumes/oclc/34608544.html.
Pełny tekst źródłaTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 170-173).
Forney, Elizabeth A. "Distribution supply chain optimization". 2007. http://etd.louisville.edu/data/UofL0317t2007.pdf.
Pełny tekst źródłaTitle and description from thesis home page (viewed May 14, 2007). Department of Industrial Engineering. Vita. "May 2007." Includes bibliographical references (p. 34-35).
Zhou, Ya-Bin, i 周亞鑌. "Study and Implementation of a High-Power Power Supply". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88720558475635909800.
Pełny tekst źródła國立臺灣科技大學
電子工程系
102
This thesis presents the study and implementation of a power supply with a input AC voltage of 600 Vrms and output power of 7 kW. A two-stage power converter topology consisting of an interleaved power factor corrector (PFC) and an open-loop controlled full-bridge series resonant convertor is adopted. The complete system incorporates the EMI filter, auxiliary power supplies, and protection circuits. The front-stage interleaved PFC helps improve the power factor and reduce the input current harmonics. The post-stage full-bridge series resonant converter can raise the conversion efficiency with zero-voltage switching (ZVS) and zero-current switching (ZCS) techniques. Finally, a 7-kW power converter is designed, implemented, and tested. Experimental results are measured and analyzed.
Lin, Gwei-chywan, i 林桂全. "Standby Power Loss Improvement of a 200W Power Supply". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00920518308713326762.
Pełny tekst źródła國立臺灣科技大學
電子工程系
96
1Because of the critically global warming pollution, economy of energy resources has become a serious issue. This thesis is devoted to design an AC-to-DC regulator for optimizing the conversion efficiency of the converter and decreasing the power loss during no-load condition. The advantages and drawbacks of the power supply under is operated in different modes, are also discussed especially about the power loss under no-load condition. The power supply consists two parts. The pre-regulator is an active power factor correction circuit to raise the input power factor. The post-stage is a half-bridge series resonant converter that utilizes zero–voltage switching and synchronous rectification to achieve high conversion efficiency. In this thesis, the control mechanism reducing the duty cycle is utiliged to solve the output over voltage problem of the half-bridge series resonant converter under no-load condition.