Dissertations / Theses: 'Power supply'

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Svystun, Serhii, and Сергій Сергійович Свистун. "Secondary power supply." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50165.

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1.Rules of arrangement of electrical installations. The fourth edition, revised and supplemented - H .: Publishing House "Fort", 2011.— 736 p. 2.Handbook of rural electrician / Edited by Candidate of Technical Sciences VS Oiler. - 3rd edition, revised and supplemented. - Kyiv, Publishing House "Harvest", 1989. - 264 p. 3.Budishchev MS Electrical engineering, electronics and microprocessor technology. Textbook. - Lviv: Afisha, 2001. - 424 p. 4.DSTU 2843-94. Electrical engineering. Basic concepts. Terms and definitions. Valid from 1995-01-01. - Kyiv: Derzhspozhyvstandart Ukrainy, 1995. - 65 p.
In 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.

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Mills, Carlo Juan. "Supply-friendly single phase uninteruptible power supply." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/16095.

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Includes bibliography.
Uninterruptible 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.

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Eireiner, Matthias. "Power supply integrity in low power designs." Aachen Shaker, 2009. http://d-nb.info/99845642X/04.

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Beikoff, 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.

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A switching power supply to drive magnetrons for microwave heating has been designed, prototyped and tested. The magnetron has an rf power output of 6000 watts and requires a DC voltage of 7200 volts at a current of approximately 1.1 amps for a power input to the magnetron of 8000 watts. Six magnetrons are to be connected per railway tanker for heating the tankers at a railway terminus. The power supply has been designed for small size, efficiency and reliability. Current technology has been used. Insulated Gate Bipolar Transistors (IGBT) and power MOSFETs, both of moderately high current and voltage ratings, have been used at 25 kHz and 50 kHz switching frequencies respectively. MOSFETs of 20 amps and 500 volts and IGBT's of 40 amps and 600 volts ratings have been used. Ferrites for use at high switching frequencies have been used for transformers and iron powder material has been used for energy storage inductors. High quality insulating materials have been used to achieve the high voltage insulation requirements. Kapton, PTFE, mylar and nylon have been used where appropriate. Special features of the power supply include the power factor correction first stage, the use of the higher than normal leakage inductance of the power converter second stage transformer to make a resonant converter and the ripple cancelling effect of the series connection of the units on each phase. The power factor correction meets I EC 555 and AS2279 standards for harmonic content on the power supply source. The resonant converter yields zero load current switching of the converter transistors. The output 100 Hz ripple on the 7200 volt supply is negligible because of the series connection of the three outputs.

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Kirby, 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.

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While technology develops, many devices are becoming portable and battery driven. These devices are among us and are unconditionally a part of today’s society. The usage and the surrounding environment of these devices can vary depending on the intended functionality and purpose. Varying environmental conditions impact the devices charging method. This report covers the development and implementation of a printed circuit board. The circuit board is going to be used as a prototype for future testing for a portable device which the company VectorizeMove [1] is developing. The circuit board contains multiple charging methods and a voltage regulation system. The charging methods include inductive charging and micro USB charging. The charging systems are designed for a lithium polymer battery which are charged through different phases which prevent damage to the battery. The voltage regulation system is implemented to test and ensure a stable voltage output for the components included in the company's device.
Medan 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.

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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.

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The history of applied superconductor-based equipment in industry, especially in power system, is briefly reviewed. The thesis presents a development of a superconducting magnetic energy storage system for power quality improvement and uninterruptible power supply (PQ/UPS SMES). The configuration of such a system and its control concept are analyzed in full details. Evaluation tests of an SMES system operating on a simple power system are presented and analyzed. They validate the applicability of such a system, as an attractive alternative for power quality improvement and uninterruptable power supply.
The 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.

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Eireiner, Matthias [Verfasser]. "Power Supply Integrity in Low Power Designs / Matthias Eireiner." Aachen : Shaker, 2009. http://d-nb.info/1159834733/34.

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Ibishukcu, Ozlem, and 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.

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Managing supply chain relations has evolved over a decade and many companies have given importance to regulate their relations in supply chain relations to stay competitive in the market. In this context of adjusting relations among supply chain members, central point of discussion is the role of power. Power can be a component that persuades one member of supply chain to do certain things that he/she wouldn’t agree on doing it voluntarily. The implication of that power among supply chain members is called as power relations. These power relations between the supply chain members need to be sustained under circumstances of whether the power is balanced or not balanced between the two actors. The key research questions are formulated as followed, What is the perspective of the supply chain members regarding to the role of power relations among supply chain actors? How do the cost, transparency, reliability and flexibility help to sustain the power relations in supply chain? In order to answer these questions, structured literature review was conducted. The conceptual model to sustain the supply chain relations included four main components that were cost, transparency, reliability and flexibility. Interviews were conducted in three companies located in Sweden, Turkey and India. The company profiles regarding to power relations in this dyadic relationship were the main concern. The three cases tested were supplier dominancy, mutual dependency and subordinate buyer. In this thesis, we accomplished how supply chain members sustained their relations under the influence of power practices among supply chain members. We concluded our thesis study, showing the inter-connection in between these four elements to enable the sustainability of power relations. Moreover, we inferred that even though power seems to be a negative concept, the companies are able to maintain their power relations through awareness of existing power. In addition to that, the companies don’t give equal importance to each four elements though each element is present to maintain the power relations in their dyadic supply chain relationship.

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Wang, Jing. "Power supply noise in delay testing." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1428.

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Samaha, Melhem 1977. "Privatization of power supply in Lebanon." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/47912.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
"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.

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Moskalenko, M. M., and V. V. Dulya-Borzenec. "Autonomous power supply for safety systems." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/49068.

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It is well-known that in mines for mining equipment supply is used the high voltage values (U = 1140/660 V). Besides, the safety system’s devices are based on chip components that used the spark-safe voltage of lesser of 5 V. Taking into account this fact, for automation systems supply a lot of companies produced the low-voltage power supplies. To convert the high-voltage into low-voltage are used transformers or high-voltage capacitors in pulsed power supplies. These devices have a significantly overall dimension and are needed to use a bulk explosion-safe protective covers. There is also difficult problem of the electro-magnetic pulses safety. These pulses are occurred while switching the electrical motors with power.

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Hassan, Amal M. "Power Supply Solutions for Modern FPGAs." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338433937.

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Wildrick, Carl M. "Stability of distributed power supply systems." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07112009-040311/.

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Pholboon, 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.

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Magnet Power Supplies (MPSs) for high current magnet loads are extensively used in high energy physics applications such as partical-beam excitation and control for particle accelerator systems. The requirements for MPSs include very low output waveform ripple and demanding transient performance. In addition, low volume and high efficiency are also a benefit in many applications. The purpose of this project was to investigate the suitable converter topology for a DC magnet load using the example power converter specification used to power the Diamond Light Source Storage Ring Quadrupole Magnets. The proposed converter was based on soft-switching resonant converter technology. The input stage consisted of a three phase diode rectifier with a DC link capacitor connected on the grid. The output stage was composed of a synchronous current doubler rectifier (SCDR) linked to the input stage using a series resonant parallel loaded (SRPL) inverter with a high frequency step down transformer. The dynamic model of the converter suitable for control design was based on a DQ approach. The power losses analysis was also presented to predict the converter efficiency. The converter was simulated using a MATLAB simulink in conjunction with PLECS. The design and construction of the converter including the magnet load emulator were presented in detail. Simulation and experimental results verify the feasibility of the proposed converter topology and the modelling method. Finally, the experimental converter power losses compared to the simulated losses estimation confirm the reliability of the power losses principle.

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Shafik, 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.

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Chan, Weng Hong. "Harmonic reduction and power factor correction in low power supply system." Thesis, University of Macau, 2002. http://umaclib3.umac.mo/record=b1445817.

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Tan, Benjamin H. "A Novel Arc Welding Power Supply with Improved Power Factor Correction." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2199.

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This paper presents the design and development of a novel Arc Welding Power Supply utilizing a modified two-switch forward converter topology. The proposed design improves the power quality by improving power factor to near unity and reducing total harmonic distortion. State space analysis of the proposed circuit showed that the circuit followed a boost-buck input output relationship. Simulation of the circuit was first implemented in LTspice to verify the functionality of the new topology. Hardware implementation of the proposed design was built on a scaled-down prototype for a proof-of-concept of the new topology. The prototype specifications were created for a 5A, 20V output with a 20-24V, 60Hz input. This project demonstrated that the proposed new topology was successful in obtaining a near unity power factor and a total harmonic distortion of less than 2%. Additionally, the prototype followed the simulation and calculations of a boost-buck function while varying duty cycle, and the final measurements aligned well with waveforms from the simulation.

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Rye-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.

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This master thesis studies the possible pathways to support military vehicles and ground troops with electrical power a more efficient way, than the present solution. Present energy solution is based on generation of electrical power from internal combustion engines and/or stored energy in batteries. The usage of the vehicles engine for generation of electricity in static positions, results in several disadvantages on a modern battlefield. The batteries specific energy increase every year, but the soldiers energy need has increased even faster, resulting in a problematic weight load for the dismounted soldier. In the thesis several new or improved solutions are investigated. The solutions are based on technology available today or within the next decade (2020) and selected on the basis of military criteria. A flexible model has been made in an energy simulating program capable to simulate a number of different energy configurations based on future electrical power consumption. Modelling and simulation of the soldiers power system has been recommended by earlier studies [10], but similar models have not been found by the author. The simulation results reveal that improvements of soldiers energy solution are feasible. By implementing new or better batteries in the current energy system, considerable improvement can be achieved. Introduction of fuel cells based on methanol fuel starts to become mature, and can result in several advantages on the battlefield. Solar harvesting can give an additional energy supply, but depend highly on insolation and available time for harvesting.

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Gutnik, Vadim. "Variable supply voltage for low power DSP." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/36088.

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Song, Jian, Ni Luo, Liu Cao, and Min Xu. "An Evaluation System for Airplane's Power Supply." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596441.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV
Power 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.

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Andersson, Johan, and 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.

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In the current and next generation automotive telematic platforms, high demands are put on high efficiency power supplies. This thesis investigates different switch mode power converter solutions that operates with high efficiency for both low and high power loads. A market survey was conducted alongside meetings with ACTIA Nordic and their subcontractors. Three solutions from the market survey were selected for further investigation. One solution from the investigation was selected and implemented as a demonstration platform for further testing. The result shows a full test sequence for the designed power supply solution.

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Li, Yi. "Wireless power supply for ambient assisted living." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387371/.

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This thesis focuses on the development of the wireless applications for Ambient Assisted Living (AAL) system, the energy harvesting technique for powering the passive sensors in the building environment, and the flexible screen printed coils for Wireless Power Transfer (WPT) system to provide the power for a body-area sensor network in an AAL system. The AAL provides safe environments around assisted peoples and help them maintain independent living. The applications in AAL include the fixed monitor sensor in building environment and the wearable sensor on users body area. For supplying power for the applications of AAL wireless power supply provides the power without cables while offers a more environmentally friendly solution. Compared with energy harvesting technology, WPT is capable of supplying more power without increasing the size of the device. In this work, a solar powered PIR sensor demonstrates that the energy harvesting technique for a passive sensor application for the fixed monitor sensor in building environment, which can work for up to 16 hours without ambient energy input. For the on-body area application, the flexible coils are employed in the WPT system because of the comfort requirement. The coils are printed on 65/35 polyester/cotton textile with a Fabink-UV-IF1 interface layer coating. The interface layer provides a relatively flat and smooth surface to prevent the permeation of the conductive paste into the textile and allows the printing of finer profile coils, and the flexibility and breathability of textile can be remained. The measured inductances of the printed flexible coils are 3.9 μH for single layer. The design of the printed coil minimises the coil’s parasitic capacitance, which is less than 25 pF, and consequently increase the self-resonant frequency of the printed coil. A 5 V 1.51 W DC output has been achieved by a wireless power transfer system using the printed flexible coils with Qi standard circuitry; a DC-DC efficiency of 38% has been measured. It has been compared with the system employed with Qi standard wound copper coils which has the recorded 52% DC-DC efficiency.

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Singh, Anjali. "Asymmetrical Power Relationships in Supply Chain Networks." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42495.

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Global supply chains have become increasingly complex and a critical source of competitive advantage, which makes the understanding of how supply chains create and distribute value an essential task. Prior literature on concentration risks has primarily focused on customer concentration and has overlooked the challenges posed by the major upstream supply chain partners. In addition, CEOs with an optimal mix of technical and behavioral abilities can shape the strategic decision-making process to obtain an advantage against the nonfinancial stakeholders. The existing literature has also overlooked the significant role of the CEO in reducing the impact of supplier-base/customer-base concentrations. Utilizing objective supply chain relation data collected from Bloomberg SPLC and Compustat, we map the supplier base and the customer base for each electronic and chemical manufacturing firm publicly listed under S&P1500 for the fiscal year 2017. We then construct objective measures of supplier and customer concentrations and examine their impacts on the focal firm's financial performance measured by Tobin's Q, gross profit margin, and net profit margin. The performance metrics also include the focal firm's payable period (against the supplier-base) and receivable period (against the customer-base). We also collect information related to the CEOs appointed by the focal manufacturing firm, such as gender, age, and tenure from Execucomp, and consequently investigate their impacts on the supplier concentration and the customer concentration. Our empirical analysis shows contradictory results in the context of supplier-base/customer-base concentrations: higher supplier-base concentration is observed to harm the focal firm’s financial performance, but higher customer-base concentration leads to an increase in the focal firm’s profitability. Although CEO characteristics such as tenure and age did not have any notable impact, female CEOs are found to reduce the adversarial impact of supplier-base concentration and are assumed to exercise a voluntary power restraint against the cooperative customer-base.

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Smilek, 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.

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Tato práce se zabývá vývojem nezávislého elektrického zdroje pro moderní nízkopříkonové elektrické aplikace. Protože tradiční řešení napájení drobných spotřebičů s využitím baterií či akumulátorů snižuje uživatelský komfort kvůli potřebě pravidelné údržby, navrhovaný zdroj využívá principu energy harvesting. Tento princip spočívá v získávání energie přímo z okolního prostředí napájené aplikace a její přeměně na energii elektrickou, která je dále využita pro na-pájení moderních MEMS (mikroelektromechanických) zařízení. Potenciální aplikací vyvíjeného zdroje je především moderní nositelná elektronika a biomedicínské senzory. Tato oblast využití ovšem klade zvýšené nároky na parametry generátoru, který musí zajistit dostatečný generovaný výkon z energie, dostupné v okolí lidského těla, a to při zachování prakticky využitelné velikosti a hmotnosti. Po stanovení předběžných požadavků a provedení analýz vhodnosti dostupných zdrojů energie ke konverzi byla k využití vybrána kinetická energie lidských aktivit. Byla provedena série měření zrychlení na lidském těle, především v místě předpokládaného umístění generátoru, aby bylo možno analyzovat a generalizovat hodnoty energie dostupné ke konverzi v daném umístění. V návaznosti na tato měření a analýzy byl vyvinut inovativní kinetický energy harvester, který byl následně vyroben jako funkční vzorek. Tento vzorek byl pak testován v reálných podmínkách pro verifikaci simulačního modelu a vyhodnocení reálné použitelnosti takového zařízení. Kromě samotného vývoje generátoru je v práci popsán i originální způsob zvýšení generovaného výkonu pro kinetické energy harvestery a jsou prezentována statistická data a modely pro predikci využitelnosti kinetických harvesterů pro získávání energie z lidské aktivity.

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Guigue, Etienne. "Market Power and Frictions in Supply Chains." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAG009.

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Cette thèse vise à mieux comprendre le rôle du pouvoir de marché et de la concurrence imparfaite dans les relations entre fournisseurs et acheteurs opérant dans des chaînes de valeur mondiales et nationales entrelacées. Cette recherche s'appuie sur des outils empiriques et théoriques, appliqués à l'industrie laitière française et aux industriels importateurs français.Le Chapitre 1 propose une nouvelle méthodologie pour estimer séparément le pouvoir de marché à l'achat et à la vente, appliquée aux transformateurs de produits laitiers en France. Ces entreprises exercent du pouvoir de marché à l'achat lorsqu'elles achètent du lait cru et à la vente lorsqu'elles commercialisent des produits laitiers. L'analyse est basée sur des données individuelles d'entreprises, où les prix et les quantités de lait cru par origine côté achat et par produit côté vente sont observés de 2003 à 2018. Les marges totales sont estimées via une approche « fonction de production ». L'existence d'un produit de base (i) substituable en tant qu'intrant ou en tant que produit, et (ii) échangé sur les marchés mondiaux où les transformateurs laitiers français sont preneurs de prix, permet ensuite d'estimer séparément les marges de chaque entreprise à l'achat, par origine, et à la vente, par produit. Les résultants indiquent que les entreprises laitières achètent en moyenne le lait cru à un prix inférieur de 16% à sa contribution marginale à leurs bénéfices, et vendent les produits laitiers à un prix supérieur de 41% à leurs coûts marginaux. Une analyse de la transmission des chocs de coûts des agriculteurs et des transformateurs sur la chaîne d'approvisionnement révèle que ces chocs sont partiellement absorbés par les transformateurs. En ajustant leurs marges, les transformateurs lissent les variations de revenu des agriculteurs mais détournent en moyenne 65% de leurs subventions.Le Chapitre 2 analyse l'impact des quotas de production et de leur suppression progressive sur le marché du lait en France, montrant que les quotas ont généré deux types de distorsions. Premièrement, en fixant mécaniquement les parts de production des départements français à leurs niveaux pré-quotas (1984), les quotas ont stoppé une concentration spatiale naturelle pendant environ 25 ans, un processus qui a repris après le début du retrait progressif des quotas en 2008. Deuxièmement, le système de quotas a favorisé la croissance des petites exploitations mais limité l'expansion des plus grandes, freinant ainsi des inégalités jusqu'alors croissantes entre fermes, mais au prix d'une distorsion de l'écrémage concurrentiel des exploitations laitières. Enfin, le processus de rattrapage dans la sélection des exploitations post-quotas est intervenu plus ou moins tôt dans les départements, en fonction de la contrainte imposée par les quotas au niveau local. Ces observations sont rationalisées à l'aide d'un modèle de concurrence parfaite entre exploitations hétérogènes.Le Chapitre 3 quantifie le pouvoir de marché des entreprises à l'achat d'intrants et évalue ses effets agrégés. Le chapitre présente une stratégie empirique visant à estimer le pouvoir de marché à l'achat de produits intermédiaires importés ou achetés localement, sans imposer d'hypothèses sur d'autres marchés d'intrants, et utilisant des données standard de commerce international et de production. Ce chapitre montre que les entreprises manufacturières françaises exercent une marge moyenne à l'achat de 1,49 sur les intrants importés et de 1,59 sur les intrants achetés localement, révélant un pouvoir de marché à l'achat significatif sur les deux types d'intrants. Les conséquences en termes de bien-être sont ensuite explorées avec un modèle d'équilibre
This 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

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26

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.

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Bibliography: pages 168-174.
The 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.

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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/.

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This thesis has two main objectives. First, to develop a philosophical and theoretical framework for a cratological (from the Greek kratos: power) study of technology, i.e. one that explains and evaluates how certain technologies afford states or changes in the structure of power of the social systems in which they are embedded. The normative principle proposed is the ideal of equality of power. The second objective is to deploy these frameworks in an analysis of the technological and industrial development of systems for electric power supply. Driven by a quest to achieve greater economies of scale, the technological development of the industry during the 20th century emphasised constant increments in output scale and a model of centralised supply. Along with this process came a configuration and consolidation of the industry around a highly concentrated or monopolistic structure. In these conditions, utilities and other power companies acquired control over a key social resource, namely electric energy, and a concomitant share of social power. Since the 1980s, but particularly in the last decade, technological innovations are opening the possibility of a radical transformation in the industrial structure of power supply systems around the paradigm of distributed energy resources. Along with important technical, economic and ecological benefits, this new paradigm may afford a positive, from our cratological perspective, transformation: namely a shifting of control over the electricity supply system towards communities, small and independent generators, and a new breed of energy prosumers. All of these may find themselves newly empowered by the emerging technological paradigm, in a way that is similar to what is also becoming possible in the communications industry thanks to the development of the Internet.

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Biner, Dominik. "Power supply and motion system for planetary rover /." Sion, 2008. http://doc.rero.ch/record/10802?ln=fr.

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Eidsaune, 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.

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To 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.

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30

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.

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This 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.

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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.

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Abstract: How to secure the power supply for future generation vehicles is an open question. This thesis uses Web-HIPRE as a tool of Decision Support System to predict the main compositions of future generation vehicles and also analyzes the advantages and shortages of currently existing solutions. The method of system approach is utilized to find out common problems of those existing solutions and to form an integrative solution. A model for this integrative solution is built under PowerSIM environment and the main objective of the model is to simulate the energy balance between power supply and demand. Finally, a brief discussion mainly focuses on the social and economic impact of the solution is made under PEBOSCA framework.

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32

Melkonyan, 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.

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33

Lopez, Arevalo Saul. "Matrix converter for frequency changing power supply applications." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10477/.

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The purpose of this work is to investigate the design and implementation of a 7.5kVA Matrix Converter-based power supply for aircraft applications (GPU Ground Power Unit). A Matlab/Simulink as well as SABER simulation analysis of the candidate Matrix Converter system is provided. The design and implementation of the Matrix Converter is described, with particular attention to the strict requirements of the given power supply application. This AC-AC system is proposed as an effective replacement for the conventional AC-DC-AC system which employs a two-step power conversion. The Matrix Converter is an attractive topology of power converter for power supply applications where factors such as the absence of electrolytic capacitors, the potentiality of increasing power density, reducing size and weight and good input power quality are fundamental. An improved control structure is proposed. This structure employs an ABC reference frame implementation comprising at the Repetitive Control strategy combined with a traditional tracking controller in order to attenuate or eliminate the unwanted harmonic distortion in the output voltage waveform of the Matrix Converter and to compensate for the steady-state error. The system with the proposed control was initially fully analyzed and verified by simulation. The analysis of the input and output waveforms identified the constraints that need to be satisfied to ensure successful operation of the converter. Finally, to demonstrate both the Matrix Converter concept and the control strategy proposed, a 7.5kVA prototype of the proposed system was constructed and tested in Nottingham PEMC laboratory. The experimental results obtained confirmed the expectations from the simulation study and the validity of the power converter and control design.

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34

Ramadass, Yogesh Kumar. "An energy optimal power supply for digital circuits." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37922.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.
Includes 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.

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35

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.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged 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.

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36

Leng, Tian Duo, and 冷天鐸. "Power-factor-corrected switching power supply." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/68470288347342661341.

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Huang, Zih-Wei, and 黃子維. "High-power Laser Switching Power Supply." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5654ca.

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碩士
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.

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CHENG, SHENG-XIAN, and 陳聖賢. "Distributed resonant power supply." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/62854260314308645021.

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Boost, Mike. "High performance medium power uninterruptible power supply." Thesis, 1990. http://spectrum.library.concordia.ca/3413/1/NL56078.pdf.

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Cheng, Chieh-yin, and 鄭介尹. "Design of Programmable Power-Quality Power Supply." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/ub94gr.

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碩士
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.

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Kuo, Yu-Chieh, and 郭毓介. "High power density of the vehicle power supply." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/33697613470071097936.

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碩士
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.

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Chang, Yu-Chen, and 張佑丞. "High Power Audio Amplifier with Variable Power Supply." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u285tg.

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博士
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.

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Ahlström, Johan, and Edward Nordström. "PSQS – Power Supply Quality Simulator." Thesis, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-6848.

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Kitron 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.

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Huang, Chang-Xin, and 黃常新. "Microprocessor-Based Uninterruptible Power Supply." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/6z365h.

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碩士
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.

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45

周加昇. "Power supply automated test system." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8tg9vs.

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碩士
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.

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46

V, Polishchuk A. "Power Supply on the Plane." Thesis, 2018. http://er.nau.edu.ua/handle/NAU/34694.

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Chandorkar, Mukul C. "Distributed uninterruptible power supply systems." 1995. http://catalog.hathitrust.org/api/volumes/oclc/34608544.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1995.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 170-173).

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48

Forney, Elizabeth A. "Distribution supply chain optimization." 2007. http://etd.louisville.edu/data/UofL0317t2007.pdf.

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Thesis (M.Eng.)--University of Louisville, 2007.
Title and description from thesis home page (viewed May 14, 2007). Department of Industrial Engineering. Vita. "May 2007." Includes bibliographical references (p. 34-35).

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Zhou, Ya-Bin, and 周亞鑌. "Study and Implementation of a High-Power Power Supply." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88720558475635909800.

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碩士
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.

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Lin, Gwei-chywan, and 林桂全. "Standby Power Loss Improvement of a 200W Power Supply." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00920518308713326762.

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碩士
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.

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Dissertations / Theses on the topic 'Power supply'

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