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1
Wong, Fu Keung, i n/a. "High Frequency Transformer for Switching Mode Power Supplies". Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050211.110915.
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A power supply is an essential part of all electronic devices. A switching mode power supply is a light weight power solution for most modern electronic equipment. The high frequency transformer is the backbone of modern switched mode power supplies. The skin effect and proximity effects are major problems in high frequency transformer design, because of induced eddy currents. These effects can result in transformers being destroyed and losing their power transferring function at high frequencies. Therefore, eddy currents are unwanted currents in high frequency transformers. Leakage inductance and the unbalanced magnetic flux distribution are two further obstacles for the development of high frequency transformers. Winding structures of power transformers are also a critical part of transformer design and manufacture, especially for high frequency applications. A new planar transformer with a helical winding structure has been designed and can maintain the advantages of existing planar transformers and significantly reduce the eddy currents in the windings. The maximum eddy current density can be reduced to 27% of the density of the planar transformer with meander type winding structure and 33% of the density of the transformer with circular spiral winding structure at an operating frequency of 1MHz. The voltage ratio of the transformer with helical winding structure is effectively improved to 150% of the voltage ratio of the planar transformer with circular spiral coils. With the evenly distributed magnetic flux around the winding, the planar transformer with helical winding structure is excellent for high frequency switching mode power supplies in the 21st Century.
2
Zhang, Dongbing. "Switching mode power supply noise source impedance measurement and EMI filter characterization". Thesis, Virginia Polytechnic Institute and State University, 1996. http://hdl.handle.net/10919/51922.
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The effectiveness of an EMI filter is closely related to the impedance of the noise source. Due to the time-varying nature of the noise source impedance of an offline power supply, the measurement of it cannot be done using conventional impedance measuring methods. Two new methods, the insertion loss method and the signal injection method, are proposed to perform such a measurement. The insertion loss method utilizes the EMI emission as a signal source and derives the source impedance by measuring the emission attenuation caused by an inserted impedance. The signal injection method injects a signal to the power supply and measures the response. The insertion loss method is verified experimentally both for common mode and differential mode, The signal injection method for common mode source impedance measurement is experimentally verified. That for differential mode source impedance measurement requires a faster equipment and is not fully verified.
An EMI filter is usually characterized in the manufacturer’s catalog by its attenuation in a standard system (50Ω source impedance and 50Ω load impedance). The effectiveness of the filter in a practical system may significantly deviate from the manufacturer’s data. To provide the users with practically useful information, a scheme to characterize the EMI filter, the impedance matrix approach is proposed. This approach takes parasitic effect into consideration and the parameters can be measured relatively easily. The approach is verified experimentally by applying a commercial EMI filter to a power supply and comparing the predicted attenuation with the measured one.Master of Science
3
Qu, Song. "Non-Intrinsic Differential-Mode Noise in Switching Power Supplies and Its Implications to EMI Filter Design". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/9788.
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Electromagnetic Interference (EMI) problems in switching power supplies have been traditionally treated with cut-and-try approaches. In recent years, advancement has been made to better understand the problems and minimize the cut-and-try portion of the design process. However, there are still phenomena difficult to explain in many practical design situations. Often, the problems may be solved by luck but many puzzles remain unsolved. If not fully understood, these puzzles are very likely to come back to haunt the designers.
According to the conventional theory, there are two modes of noise: the Differential-Mode (DM) noise and the Common-Mode (CM) noise. Recently, a new noise-coupling mode called Non-Intrinsic Differential-Mode (NIDM) noise was uncovered accidentally in the process of explaining certain EMI filter action [1]. This phenomenon has never been thoroughly studied. The focus of the present thesis is to investigate the NIDM phenomenon and its implications to practical EMI filter design issues.
The generation mechanism and basic characteristics of this phenomenon will be briefly reviewed, which is crucial to the understanding of the remaining parts of the research. Two essential diagnostic tools are introduced. One is the DM/CM noise separator and the other is the zero-span mode operation of a spectrum analyzer.
The results of the investigation will be presented. The results will be presented using practical examples, which tie the phenomenon to filter design issues. In some examples, explanations are given to dispel the puzzles commonly encountered in the practice.
A filter design procedure is suggested for off-line power supplies. This procedure incorporates the NIDM phenomenon into an existing design procedure. Only first-order and second-order filter topologies are included in the discussion.Master of Science
4
Olivík, Lukáš. "Elektromagnetická kompatibilita spínaných napájecích zdrojů". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219851.
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The goal of this thesis is to design flyback converter with given parameters complying with standards for electromagnetic compatibility. This thesis describes detailed design of the flyback converter. It summarizes the recommendations for PCB design. Knowledge from number of comparative measurements of the impact of component selection on conducted emission signature was applied during the flyback converter design. Big part of the thesis is aimed on conducted emission measurement and separation of common mode and differential mode emissions. The simple and fast Time domain measurement of conducted emission is described. Final measurement of designed converter was performed at the end of the thesis.
5
Krška, Vlastimil. "Digitálně řízený spínaný napájecí zdroj". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219162.
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This master’s thesis is an introduction to switching mode power supplies, especially focused on digital control. It summarizes the basic topologies of switching mode power supplies, and discusses the fundamental issues of digital power supply control. It also summarizes basic informations about Piccolo microcontrolers, about experimental kit and about main parts of sample source code. Also is described here own implementation of the control law and the theory and implementation of maximum power point tracking. The conclusion of this thesis deals with implemantation a testing of the designed digitally controled switching power supply.
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Dias, Agnaldo Vieira. "Sistema de alimentação chaveado para modulador de pulsos com linha de retardo aplicado em sistema radar = Switching mode system to supply pulse modulators based in pulse forming network applied to radar". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258992.
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Orientador: Ernesto Ruppert FilhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-21T00:56:13Z (GMT). No. of bitstreams: 1 Dias_AgnaldoVieira_M.pdf: 2229736 bytes, checksum: 725a7fa267bc30780c457689e4356336 (MD5) Previous issue date: 2012
Resumo: O estudo da utilização de conversores CC/CC isolados e elevadores de tensão para a alimentação de moduladores de pulsos é apresentado neste trabalho. Foi selecionada a topologia em ponte completa, dando-se enfoque ao problema das capacitâncias parasitas envolvidas no circuito, que aparecem de forma acentuada em transformadores elevadores de tensão e filtros indutivos de saída e são altamente indesejáveis quando se opera em regime chaveado. Essas capacitâncias são tratadas através de uma forma de amortecimento, onde a energia armazenada nas mesmas é devolvida à fonte primária ao final de cada semiciclo de chaveamento, tentando obter-se menor volume, maior rendimento e menor dissipação de calor no conversor. Além disso, um circuito de regulação de carga é utilizado para garantir uma maior estabilidade de pulso e contornar problemas típicos de moduladores de pulsos utilizados em radares, como o efeito de backswing. O modulador de pulsos utilizado como carga para esse sistema opera com uma tensão de alimentação de 1kV, frequência de repetição de pulsos (PRF) de 585Hz e consome uma potência da ordem de 2,1kW. O conversor CC/CC é alimentado por um barramento CC não regulado de 280V
Abstract: The study of high-voltage isolated DC/DC converters used to supply pulse modulators is presented on this dissertation. The Full Bridge topology was selected, focusing in problems caused by parasitic capacitances in the circuit. This characteristic, which appears sharply in high voltage transformers and in inductors of output filter, is highly undesirable when the circuit is operated in switching mode. These capacitances are handled using a soft commutation technique, where their stored energy are returned to the primary source in the end of each switching cycle, trying to get a low size, high efficiency and low heat dissipation in the converter. Moreover, a charging regulator circuit is used to ensure good pulse stability and avoid typical problems in the pulse modulators use, such as the backswing effect. The pulse modulator used as load for this converter operates with a supply voltage of 1kV, pulse repetition frequency (PRF) of 585Hz and consumes 2.1 kW. The converter input is supplied by a 280V unregulated DC bus
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
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Novák, Matyáš. "Návrh hardwaru řídící jednotky dieselového vstřikovacího systémuu". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241161.
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This master’s thesis deals with the basic design of diesel injection control unit hardware. There is a description of the whole blocks of Motorpal Common Rail diesel injection system in the introduction. Next are described requirement of control unit hardware. In the following are descriptions of parts, which was choosed for adjustment. The second part of thesis describes the whole design of control unit wiring diagram. There is described each block in detail in this part. Next part describes component placement on printed circuit board. The conclusion of thesis compare designed version of control unit with elderly versions.
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Li, Bo. "Conception et test de cellules de gestion d'énergie à commande numérique en technologies CMOS avancées". Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00782429.
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Les technologies avancées de semi-conducteur permettent de mettre en œuvre un contrôleur numérique dédié aux convertisseurs à découpage, de faible puissance et de fréquence de découpage élevée sur FPGA et ASIC. Cette thèse vise à proposer des contrôleurs numériques des performances élevées, de faible consommation énergétique et qui peuvent être implémentés facilement. En plus des contrôleurs numériques existants comme PID, RST, tri-mode et par mode de glissement, un nouveau contrôleur numérique (DDP) pour le convertisseur abaisseur de tension est proposé sur le principe de la commande prédictive: il introduit une nouvelle variable de contrôle qui est la position de la largeur d'impulsion permettant de contrôler de façon simultanée le courant dans l'inductance et la tension de sortie. La solution permet une dynamique très rapide en transitoire, aussi bien pour la variation de la charge que pour les changements de tension de référence. Les résultats expérimentaux sur FPGA vérifient les performances de ce contrôleur jusqu'à la fréquence de découpage de 4MHz. Un contrôleur numérique nécessite une modulation numérique de largeur d'impulsion (DPWM). L'approche Sigma-Delta de la DPWM est un bon candidat en ce qui concerne le compromis entre la complexité et les performances. Un guide de conception d'étage Sigma-Delta pour le DPWM est présenté. Une architecture améliorée de traditionnelles 1-1 MASH Sigma-Delta DPWM est synthétisée sans détérioration de la stabilité en boucle fermée ainsi qu'en préservant un coût raisonnable en ressources matérielles. Les résultats expérimentaux sur FPGA vérifient les performances des DPWM proposées en régimes stationnaire et transitoire. Deux ASICs sont portés en CMOS 0,35µm: le contrôleur en tri-mode pour le convertisseur abaisseur de tension et la commande par mode de glissement pour les convertisseurs abaisseur et élévateur de tension. Les bancs de test sont conçus pour conduire à un modèle d'évaluation de consommation énergétique. Pour le contrôleur en tri-mode, la consommation de puissance mesurée est seulement de 24,56mW/MHz lorsque le ratio de temps en régime de repos (stand-by) est 0,7. Les consommations de puissance de command par mode de glissement pour les convertisseurs abaisseur et élévateur de tension sont respectivement de 4,46mW/MHz et 4,79mW/MHz. En utilisant le modèle de puissance, une consommation de la puissance estimée inférieure à 1mW/MHz est envisageable dans des technologies CMOS plus avancées. Comparé aux contrôlés homologues analogiques de l'état de l'art, les prototypes ASICs illustrent la possibilité d'atteindre un rendement comparable pour les applications de faible et de moyen puissance mais avec l'avantage d'une meilleure précision et une meilleure flexibilité.
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Johansson, Simon. "Design of power supplies for Piezo LEGS and SiC experiment : KTH Student satellite MIST". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196216.
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KTH is funding a project whose goal is to send a satellite into space. This project is called MIST (Miniature Student Satellite) which is assembled by a team of students at KTH. On the satellite there are experiments that are invented by other teams, in two of those experiments a power supply is required. This thesis is a technical investigation on how to design the power supply to both of those experiments, which are called SiC and Piezo LEGS. Piezo LEGS will investigate how their nanosized motors will behave and function in a space environment. SiC will investigate how their silicone carbide transistors will be affected by the space environment. A team made of four other students was selected to produce SiC experiments and a PCB in which this work is included. A literature study was done to get a better understanding of how power supplies work and to know how to select a good power supply. When the power supplies were selected they were simulated to meet the requirements. The next step was to do a Printed Circuit Board(PCB) for the SiC experiment and Piezo LEGS to be able to test the power supplies functionality in the physical world. Both of the converters reached the required output and characteristics working on their respective PCB. More time is needed for long time testing and optimization on the PCB layouts.MIST (Miniature Student Satellite) är ett av KTH subventionerat projekt vilket har som mål att skicka upp en satellit i rymden. Projektet kommer omfatta flera olika experiment. Piezo LEGS ska undersöka en motors funktionalitet i rymdmiljö. SiC ska undersöka hur Silicon carbide halvledare och transistorer påverkas av rymdmiljön. Båda experimenten kräver varsin strömförsörjning för att fungera. Detta projekt ska undersöka kraven på strömförsörjning samt testa prototypen av ett kretskort för densamma. Först genomfördes en förstudie av de två typer av regulatorer som vanligtvis används som strömförsörjning, den linjära regulatorn och switch-mode regulatorn för att förklara olika strömförsörjningsteknologier, samt ta reda på de olika miljökraven. Baserat på förstudiens resultat erhölls kunskap för hur tester ska tas fram för funktionalitet av regulatorerna så att de når kraven för MIST för att sedan kunna producera de båda regulatorerna. Målet är att resultatet av simuleringarna på strömförsörjningen ska stämma överens med utfallet av kretskorten som produceras. Mätningar genomfördes på prototyp kretskort som visade att simuleringarna var korrekta och gav strömförsörjningen rätt resultat på kretskorten. Några av funktionerna på regulatorerna hann ej testas på grund av tidsbrist och mycket framtida arbete kvarstår.
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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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Bozanic, Mladen. "Design methods for integrated switching-mode power amplifiers". Thesis, University of Pretoria, 2011. http://hdl.handle.net/2263/26616.
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While a lot of time and resources have been placed into transceiver design, due to the pace of a conventional engineering design process, the design of a power amplifier is often completed using scattered resources; and not always in a methodological manner, and frequently even by an iterative trial and error process. In this thesis, a research question is posed which enables for the investigation of the possibility of streamlining the design flow for power amplifiers. After thorough theoretical investigation of existing power amplifier design methods and modelling, inductors inevitably used in power amplifier design were identified as a major drawback to efficient design, even when examples of inductors are packaged in design HIT-Kits. The main contribution of this research is engineering of an inductor design process, which in-effect contributes towards enhancing conventional power amplifiers. This inductance search algorithm finds the highest quality factor configuration of a single-layer square spiral inductor within certain tolerance using formulae for inductance and inductor parasitics of traditional single-π inductor model. Further contribution of this research is a set of algorithms for the complete design of switch-mode (Class-E and Class-F) power amplifiers and their output matching networks. These algorithms make use of classic deterministic design equations so that values of parasitic components can be calculated given input parameters, including required output power, centre frequency, supply voltage, and choice of class of operation. The hypothesis was satisfied for SiGe BiCMOS S35 process from Austriamicrosystems (AMS). Several metal-3 and thick-metal inductors were designed using the abovementioned algorithm and compared with experimental results provided by AMS. Correspondence was established between designed, experimental and EM simulation results, enabling qualification of inductors other than those with experimental results available from AMS by means of EM simulations with average relative errors of 3.7% for inductors and 21% for the Q factor at its peak frequency. For a wide range of inductors, Q-factors of 10 and more were readily experienced. Furthermore, simulations were performed for number of Class-E and Class-F amplifier configurations with HBTs with ft greater than 60 GHz and total emitter area of 96 μm² as driving transistors to complete the hypothesis testing. For the complete PA system design (including inductors), simulations showed that switch-mode power amplifiers for 50 Ω load at 2.4 GHz centre frequency can be designed using the streamlined method of this research for the output power of about 6 dB less than aimed. This power loss was expected, since it can be attributed to non-ideal properties of the driving transistor and Q-factor limitations of the integrated inductors, assumptions which the computations of the routine were based on. Although these results were obtained for a single micro-process, it was further speculated that outcome of this research has a general contribution, since streamlined method can be used with a much wider range of CMOS and BiCMOS processes, when low-gigahertz operating power amplifiers are needed. This theory was confirmed by means of simulation and fabrication in 180 nm BiCMOS process from IBM, results of which were also presented. The work presented here, was combined with algorithms for SPICE netlist extraction and the spiral inductor layout extraction (CIF and GDSII formats). This secondary research outcome further contributed to the completeness of the design flow. All the above features showed that the routine developed here is substantially better than cut-and-try methods for design of power amplifiers found in the existing body of knowledge.Thesis (PhD(Eng))--University of Pretoria, 2011.
Electrical, Electronic and Computer Engineering
unrestricted
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Aripirala, Manoj Kumar. "A compact switching mode class-f power amplifier design". Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55062.
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Even though there had been extensive research in Switching Mode Power Amplifier design their applications at industry level are quite limited. This is because a Fully-Integrated Switching Mode Power Amplifier using conventional active devices such as Bipolar Junction Transistors (BJT) or Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is challenging due to the inherent design challenges in the Switching Power Amplifier design.
A Fully-Integrated Differential Class-F2,3 Power Amplifier design is explored for this Thesis research. This Power Amplifier has a maximum theoretical efficiency of 90.7% but this value is reduced because of the switching nature of the active device, parasitic effects associated with layout and the quality factor of the passive components used. Waveform shaping required for a Class-F Power Amplifier is done using the stray inductances within a non-ideal transformer instead of individual inductors. This techniques effective reduces the foot prints of two inductors for the tuning network design and make a Fully-Integrated solution more practical.
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Reddy, Amarnath. "Expert system based switched mode power supply design". Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/12842.
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The design of power electronic systems requires wide ranging expertise in complex and often tedious tasks, such as the design of the power circuit, selection of power semiconductor devices, design of the feedback loop, design of wound components, and design for Electromagnetic Compatibility (EMC). Many of the tasks rely heavily on the experience of the designer, and cannot be solved analytically. This makes the design iterative, time consuming, and heavily dependent on the designer's experience. At present, circuit simulation packages such as SPICE or SABER are used to test a design in software. Even with these tools, it is still necessary to build a prototype to verify the design, usually followed by several test-modify-retest cycles before a final design is reached. This process involves considerable decision making, which requires substantial expertise in all aspects of power electronics. This thesis investigates the use of expert system technology, one of many artificial intelligence techniques, to assist in the design of power electronic systems. Faster design times and a more efficient design are among the advantages that can be achieved using an expert system based design. In this study, Switched Mode Power Supplies have been chosen as a typical power electronic system. An expert system (developed using wxCLIPS) has been linked with a circuit simulator (SPICE), extensive databases and a graphical display system to provide a comprehensive design environment. The techniques used in the system cover all facets of the design: preliminary circuit design, component selection, circuit simulation, control loop design, and design for EMC. Extensive knowledge bases covering the various design rules are built into the expert system. The design methodology aims to give a near complete system design with an optimum configuration produced at minimum time and cost. The investigated techniques could readily be adapted to other power electronic applications, such as Uninterruptible Power Supplies and motor drives.
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Lee, Jeffrey C., i Missy Steppler. "LOW-NOISE SWITCHING POWER SUPPLY CONSIDERATIONS FOR TELEMETRY ENCODER APPLICATIONS". International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604586.
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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, NevadaModern telemetry systems using state of the art field programmable gate arrays (FPGAs) and signal processing components require lower voltage supplies to support various CMOS core geometries while still needing multiple higher voltage rails to support legacy interfaces. Addressing these power supply requirements efficiently requires switching power supply topologies that if left unchecked can generate high input surge currents and high levels of detrimental noise for both the sensitive analog signal processing circuitry and the power supply input source. This paper focuses on the design considerations and tradeoffs associated with implementing an efficient telemetry encoder power supply while mitigating the resulting noise effects typically associated with switching power supplies. This noise can negatively affect the power supply input source and the linear signal processing circuitry within the telemetry encoder.
15
Lin, Feng. "Reduction of power supply EMI emission by switching frequency modulation". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08222009-040339/.
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Spaulding, Jonathon David. "Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62479.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
This thesis demonstrates power switches to be used in our new Asymmetric Multilevel Outphasing (AMO) transmitter architecture at mm-wave frequencies. The AMO topology breaks the linearity vs. efficiency design objective in radio frequency power amplifiers (PAs) which has until now appeared to be fundamental. These power switches allow for the modulation of the PA supply rail between four discrete levels at a maximum sampling rate of 2 GHz. This modulation results in a higher average system efficiency by reducing the outphasing angle between the phase paths. This work was designed in a 130-nm SiGe BiCMOS process.
by Jonathon David Spaulding.
M.Eng.
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Repecho, del Corral Víctor. "Fixed-switching frequency sliding mode control applied to power converters". Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/462164.
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The application of the sliding mode control in power converters has a well-known inconvenient from the practical point of view, which is to obtain fixed switching frequency implementations. This thesis deals with the development of a hysteresis band controller in charge of fixing the switching frequency of a sliding motion in power electronics applications. The proposed control measures the switching period of the control signal and modifies the hysteresis band of the comparator in order to regulate the switching frequency of the sliding motion. The proposed structure becomes in an additional control loop aside from main control loop implementing the sliding mode controller. In the first part of the thesis, the switching frequency control system is modelled and a design criteria for the control parameters are derived for guaranteeing closed loop stability, under different approaches and taking into account the most expectable working scenarios. In the second part of the thesis, the proposed strategies are applied to several power converters prototypes. Specifically, DC-to-DC and DC-to-AC power converters are built and the experimental results are shown. In this part, the strategies used for implementing the controllers are also deeply discussed.La aplicación del control en modo deslizante en el ámbito de la electrónica de potencia presente una problemática ampliamente conocida, obtener aplicaciones a frecuencia fija de operación. Es esta tesis se estudia el desarrollo de un comparador con histéresis variable encargado de regular el periodo de conmutación de controladores bajo regímenes deslizantes en convertidores de potencia. La estructura propuesta mide el periodo de conmutación de la señal de control y actualiza, de manera adecuada, la banda de histéresis del comparador a tal fin de regular la frecuencia de conmutación al valor deseado. La solución propuesta forma un segundo lazo de control, además del lazo de control principal que implementa el controlador en modo deslizante. En la primera parte de la tesis, éste segundo lazo es modelado, haciendo posible el estudio de las condiciones de estabilidad bajo realizaciones en tiempo continuo y en tiempo discreto. Además, se estudian las condiciones típicas de trabajo de los controladores utilizados en convertidores de potencia, como son los esquemas de regulación y de seguimiento de señales variantes en el tiempo. La segunda parte de la tesis se centra en evaluar, de manera experimental, los desarrollos teóricos de los controladores propuestos en convertidores de potencia. Concretamente, en la tesis se presentan los resultados experimentales obtenidos con diversos convertidores DC-DC y DC-AC. Adicionalmente, las metodologías y técnicas de implementación de los controladores son, de igual modo, ampliamente descritas.
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He, Dake. "Microcontroller-based current-mode control for power converters". Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/HE_DAKE_26.pdf.
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Zhang, Hai Bo. "High-frequency switching parallel processing topology for AC uninterruptible power supply". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40215.pdf.
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Cochrane, Daniel. "Passive Cancellation of Common-Mode Electromagnetic Interference in Switching Power Converters". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34449.
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It is well known that common-mode (CM) conducted electromagnetic interference (EMI) is caused by the common-mode current flowing through the parasitic capacitance of transistors, diodes, and transformers to ground in the power circuit. Because of the potential for interference with other systems as well as governmental regulations, it is necessary to attenuate this noise. Ordinarily this must be accomplished by using a magnetic choke on the input power lines, which can result in large penalties to the overall size, weight, and cost of the completed system.
In order to lessen the requirement for this magnetic choke, there has been in recent years a desire to introduce noise cancellation techniques to the area of EMI. This text introduces a method of canceling the common-mode EMI by using a compensating transformer winding and a capacitor. Compared with active cancellation techniques, it is much simpler and requires no additional transistors and gate-drive circuitry since it merely adds a small copper winding and a small capacitor. By using this technique the size of the EMI filter can be reduced, especially for applications requiring high currents.
In this thesis a survey of CM noise reduction techniques is presented, encompassing conventional and active cancellation techniques. The new method for passive noise cancellation is presented, which is then applied to families of isolated DC/DC converters, non-isolated DC/DC converters, and DC/AC inverters and motor drives. The method, results, and ramifications of this technique are presented in order of appearance.Master of Science
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Petkov, Roumen Dimitrov. "High power switched mode magnetron power supply systems for industrial microwave heating applications". Thesis, Teesside University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259645.
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Gartner, Andy Michael. "The development of a 100 KHZ switched-mode power supply". Thesis, Cape Technikon, 1991. http://hdl.handle.net/20.500.11838/1168.
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Thesis (Masters Diploma (Electricity Engineering) -- Cape Technikon, Cape Town,1991At the time of the design the maximum allowable operating frequency for an output power of between 200 and 250 watts was 100 kHz. Although a 600 kHz operating frequency could have been achieved, it would only be at a very low output power level. To maximise the current components available, a 210 watt 100 kHz direct-off-line switched-mode power supply was developed. The design presented can be used to power any compatible IBM XT/AT personal computer. The prototype was tested. An overall efficiency of 61% was achieved. The final prototype required 1 521 cm3 and weighed approximately 980 g, representing a power to volume ratio of 0.14 W/cm3 (2.26 W/inch3). Detailed procedures are also presented to help with the design and selection of the reactive components. Special design features include the half-bridge push-pull topology, MOSFETS as power switches, digital current limiting, primary power limiting, multiple outputs and fault counting to name but a few.
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Lin, Wen-Hsin, i 林文信. "A Study in Performance Improvement of Low-Power Switching Mode Power SupplyA Study in Performance Improvement of Low-Power Switching Mode Power SupplyA Study in Performance Improvement of Low-Power Switching Mode Power Supply". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82453183666610198843.
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碩士國立高雄應用科技大學
電機工程系
99
This thesis examines the power converter framework, and adopt the flyback converter is a schema. Used with a new analog PWM control IC (TEA1532) of Fixed Frequency Mode and Cycle Skipping Mode. Design of a range of input voltages of 90VAC to 264VAC, input frequency 47Hz arrives at 63Hz, output voltage +24VDC, total power output 25W, and conforms to the energy laws and regulations. In the article except for one of the important components for the provision of detailed design, characteristics of prototype machine authentication, to results and its comparison with older models have been proposed, as an important reference cooperative enterprises improve the performance of existing products.
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Chiu, Jung-kuei, i 邱榮貴. "Implementation of a ZVS switching mode power supply". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34021582239504601377.
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碩士國立雲林科技大學
電機工程系碩士班
94
The objective of this thesis is to design and implement a ZVS switching mode power supply based on forward converter topology. The active clamp forward converter is one of the most popular converters using the active clamp technique. To compare with the transformer reset winding and passive RCD clamp circuit applied in conventional forward converter, the advantages of active clamp technique are including: lower voltage stress on the main power switch, the ability to switch at zero voltage, reduced EMI and duty cycle operation above 50%. The basic operation principle of the active clamp forward converter is described in this thesis, then the boost and buck-boost active clamp techniques are also introduced. Finally the implementation of a ZVS switching mode power supply base on active clamp forward converter with center-tapped topology is carried out, and the specifications of the prototype circuit are: input voltage 90∼135Vrms, output voltage VO=5V and rated output current IO=20A.
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Liou, Fong-Chang, i 劉豐章. "Implementation for Switching-Mode Power Supply EMI Filter". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/24104492656536145022.
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碩士國立成功大學
電機工程學系
87
An investigation of the electromagnetic interference (EMI) filters design for the switching-mode power supply is proposed in this thesis. This begins with an introduction of the conducted interference caused from switching-transistors, transformers, rectifier diodes, during the switching process in a switching-mode power supply. It is followed by an examination to the design scheme and procedure of EMI filters in anticipation to solve such problems. A laboratory test has also been performed through the experimental analysis using a 250W switching-mode power supply and 80W converter. Test results have demonstrated the feasibility of the method for the mitigation of conducted electromagnetic interference.
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SHI, KE-GING, i 史可慶. "Design of current-mode-controlled full-bridge switching-mode power supply". Thesis, 1988. http://ndltd.ncl.edu.tw/handle/09462051205628044715.
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Chiu, Yu-Kui, i 邱鈺貴. "The Green Modified Switching Power Supply By Using Low Voltage Switching Mode". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/13076181578893285675.
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碩士國立高雄應用科技大學
電機工程系博碩士班
96
This report analyzes traditional flyback power supply design and the modification involved to comply with the latest environmental by laws. By using LVS mode to increase the overall product efficiency and reduce the standby power consumption; The data and efficiency comparisons are then made with the power analyzer between the original and the green mode modified models, which can be applied to ensure compliance with CEC level IV and even the upcoming stricter ENERGY STAR® version 2.0 regulation; The quality of the product can be optimized and the cost for materials can be controlled. This will result in a win-win situation for both the sales market and the environment.
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Shen, Wei-Chih, i 沈煒智. "Development of a Noncontact Switching Mode DC Power Supply". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/58111844930599278199.
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碩士國立清華大學
電機工程學系
94
Loosely coupled inductive power transfer system is designed to deliver power efficiently from a stationary primary source to one movable secondary load over relatively large air gap via magnetic coupling without wires and connectors. It has advantages of avoiding the dangers of sparking and the risk of electrical shocks. However, the research and development about this technology is quite limited at present in this country. Considering its potential development and applications in the future, it is vary worthy to study and explore the fundamental principle and design guideline of a noncontact switching mode DC power supply. The contributions of this thesis may be summarized as follows. First, three resonant frequencies, namely , and are obtained which can achieve minimum input volt-ampere capacity of the loosely coupled inductive power transfer system as well as maximum output power. Second, in order to analyze and design this system more efficiently, by assuming that the series resonant frequency is equal to the parallel resonant frequency, simple analytic formulas of and are obtained. Third, according to characteristics of different operation modes in AC output situation, output voltage or current can be controlled from the primary side of the transformer. Fourth, a simple design procedure and some analytic formulas are proposed to simplify the design process. Finally, a prototype is also constructed to verify the feasibility of the proposed theory.
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wen, chen kao, i 陳高文. "Realization Technology Study of Switching Mode Rectifier Power Supply". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/73100926365119126967.
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碩士義守大學
電子工程學系
90
This thesis studies the design and implementation of a power factor corrector (PFC) for telecommunication switching mode rectifier power supply. In order to improve the power factor of the input ac source, a high power factor boost-type circuit was designed. Control IC is using UC3854. The controlling method is average current mode, operating at a fixed switching frequency. The design procedures of power device are also introduced in the thesis. Finally, a PFC was manufactured with the specifications: Vin=80~270Vac/60Hz, VO=400Vdc, PO=1000W and f=45KHz. Experimental results validate the feasibility of the implemented system in high-power applications.
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Chu, Ping-Hsum, i 朱炳勳. "The Study of AC to DC Switching mode Power Supply". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/12690602207808324569.
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碩士國立雲林科技大學
電機工程系碩士班
94
This thesis studies the power factor correction（PFC）for AC/DC converter, the half-brideg series-paralle resonant converter and the single-stage active clamp converter. In power factor correction circuit the boost converter is operating at the boundary conduction mode. The boundary method is’nt suitable for high power applications because the inductor and switch peak current are twice theca input current peak value. A half-bridge series-parallel resonant converter operated at the inductive load is disussed. In this way the transistors turn on at zero voltage. Therefore the turn on switching loss is reduced and the circuit efficiency is improved. A single-stage converter has inherent gift of power factor correction when the first stage to help the switch turn on at zero voltage switching. For this reason high powerfactor, high effieiency, and low cost can be achieved in the adopted single-stage converter. Finally the experimental results are provided in this thesis to verify the effectiveness of the adoped converters.
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Jhong, Jian-Yao, i 鍾建堯. "Analysis and Implementation of Interleaved ZVS Switching Mode Power Supply". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/97788097673226154576.
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碩士國立雲林科技大學
電機工程系碩士班
99
This dissertation presents an interleaved ZVS switching mode power supply. The active clamp technology are used in the adopted zeta-flyback and the non-isolated boost converters. Active clamp circuit is connected in parallel with the primary side of the isolation transformer to recycle the energy stored in the leakage inductor of isolated transformer and to limit the peak voltage stress of switching devices. Thus the ZVS turn-on feature of power switches can be achieved to alleviate the switching losses on the primary side of the isolation transformers. The zeta-flyback topology are adopted in the output side to share the output power. The non-isolated boost converter with the series-resonant circuits composed of the leakage inductors and resonant capacitors at the secondary side of transformer is presented to achieve the ZCS turn-off of rectifier diodes. Hence, the reverse-recovery problem can be removed. Moreover, the interleaved technology can not only increase the output power but also reduce the input/output ripple currents. The operation principles, design considerations are discussed. Finally, the simulation and measured results are presented to confirm the effectiveness of the proposed converter.
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Chen, Zhong-Ping, i 陳忠平. "Study and Realization of Telecommunications Switching Mode Rectifier Power Supply". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84190408260406019275.
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碩士義守大學
電子工程學系
91
The purpose of this thesis is to design and implement a telecommunications switching mode rectifier power supply. We will examine the technology in realizing single-module 150~260V input, 48V/50A output power supply. The implemented system will be capable of the merits including high power density, high power factor, fast response to load variations, and low electromagnetic interference etc.
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SHENG, HUANG YUNG, i 黃永昇. "Estimation for Equivalent Model of Common Mode Noise Source of Switching Power Supply". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/56791020758884110004.
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Shei, Chein-Kuo, i 徐健國. "Reduction of EMI by Frequency Modulation in Switching Mode Power Supply". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/74072160249018729491.
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碩士國立臺灣大學
電機工程學研究所
93
Employing frequency modulation techniques for EMI reduction in switching converters was reported some years ago and the techniques have been gaining some momentum in actual product applications. There were different modulating schemes reported, including sine-wave modulation, triangular wave modulation, random modulation and bi-frequency modulation. However, the results reported were mostly focused on the mathematical analysis of the resulting EMI spectrum without much discussion on the side effects of the schemes on converter performances. In this thesis, these modulating schemes were reevaluated and compared. A hardware circuit to modulate the converter switching frequency was designed and built for the experiments. From the experiments, it’s observed that significant output voltage ripple can be caused by the modulating schemes. The transfer function between the output ripple and the modulating signal seems to follow the input-to-output (audio susceptibility) transfer function of a converter power stage but this has not been theoretically derived. The effects of feedback control loop gain on the output ripple are also discussed in the thesis.
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Kuei, Chiang Yew, i 江衍奎. "Quality Ensure Study of Switching Power Supply Development Using Failure Mode". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47631699276200603106.
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碩士聖約翰科技大學
工業工程與管理系碩士在職專班
101
Switching power supply is the major driver of consumer electronic products. Electronic products cannot be operated safely without stable quality of switching power supply. It focuses on examining reliability and failure status at design stage of switching power supply in order to correcting design problem before official manufacture. It can improve product quality and become key advantage for manufacturer. This study will be emphasized on collecting, clarifying and resulting problems on products design stage. Furthermore, it will conclude an effective failure data resource to offering potential failure models of new products development. It could assist to find product design problems as data collecting. The fail chances will be decreased, if the problems were found in early stage. Switching power supply development will process to design failure mode effects analysis and design quality review to ensure products quality. This research use database and failure report analysis corrective action system the concept, it can collect failure problems in products design quality review, and establish failure database with potential failure models. Those models could apply on design failure mode effects analysis, and use risk priority score to ensure quality enhancing. This study concluded, there are too many varieties of switching power supply. It has to be classified into different product categories, and set up circuit block. After that, failure modes and effects analysis can be applied to achieve best result. This information can find potential failure modes effectively. Those models could apply on design failure mode effects analysis. Consequently, Classification to switching power supply modes and circuit block. Set up with key components and failure model databases can find high risk potential failure model more easily.
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Shih, Cheng-Te, i 施承德. "Study on the Flyback Converter for a Switching Mode Power Supply". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/7v8g8h.
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碩士國立臺北科技大學
電資碩士班
96
Flyback converter is the best choice for the low power DC-to-DC switching mode power supply in modern industry. Both low cost and simple circuit structure are enough to explain its great popularity. This thesis is based on the topology of Flyback converter, the control integrated circuit UC3844 as a pulse width modulation has been employed to set up one 24 watts low power Flyback converter model. In simulation, utilize the help of EDA software, namely PowerSim, to be done in order to simulate the circuit. With the design of circuit, probe into the influence degree to the circuit of Power Factor, Total Harmonic Distortion, Ripple Factor, Output Voltage, Snubber Circuit, Start Up Circuit, Filter and Load Impedance in the design process. Finally, looks forward to a reference of design for the engineers who want to design Flyback converter and a help while developing the new products in the future.
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LIN, MU-SEN, i 林木森. "Stability analysis and design of current-mode controlled push-pull switching mode power supply". Thesis, 1988. http://ndltd.ncl.edu.tw/handle/86484870442303535312.
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LI, YU-GUAN, i 黎育冠. "Modeling, analysis and design of a pulsewidth modulated switching mode power supply". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/48168009041099924589.
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Lin, Yu-Hung, i 林宇宏. "Realization Study of an Instrument-used Switching-Mode Power Supply with Adjustable Output". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/26070923884181025453.
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碩士國立臺灣科技大學
電子工程系
88
The thesis is to research and implement an instrument-used switching-mode power supply (ISMPS) with output voltage and current adjustable. The ISMPS is composed of an EMI filter, a power factor corrector (PFC), and a DC/DC converter. The DC/DC converter is constructed by phase-shifted full-bridge (FB) converter with zero-voltage-switching (ZVS) technique. The control strategy is designed to be capable of constant voltage (CV) mode and constant current (CC) modes，which are built by voltage-adjust control (VAC) and current-limit control (CLC). A linear regulator (LR) is installed at the output end to achieve adjustable output voltage/current, and good regulation. A small-signal modeling for describing the system is conducted. A compensation work has been made to stabilize the system performance. And also, a gain/phase analyzer HP-4194A is used to tune to reach the theoretical estimation. Finally, a design example of a 500W ZVS-PWM ISMPS is examined to assess the system performance with the specification of an output voltage 0-50V and an output current 0-10A. The proposed ISMPS can actually provide an efficiency up to 90% and good load regulation within ±1% at the load condition of Vo=50V and Io=10A.
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Lee, Yao-An, i 李曜安. "Optimal Design of a 150W Switching Mode Power Supply with Power Factor Corrector by Taguchi Method". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/37424883961410671332.
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碩士逢甲大學
資訊電機工程碩士在職專班
99
Power factor and efficiency are the basic indicators for both of power quality and power saving. To attain these two factors in switching power mode supply design is the goal of power engineers. The most effects are the setting of initial parameters. The Taguchi method is proposed to implement shortcut for optimal design, with minimal number of experiments to obtain optimal results. For a 150W switching mode power supply case, Taguchi method is adopted for optimal design and the present international norms can be satisfied.
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HE, ZONG-YU, i 何宗諭. "The analysis and design of EMI filter for multi-output switching mode power supply". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/76408739317956073437.
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CHI, TSAI YU, i 蔡祐淇. "Control Strategies for Multiple Instrument-used Switching-Mode Power Supply in Parallel with Adjustable Output". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/62905459961507313704.
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碩士國立臺灣科技大學
電子工程系
89
This thesis presents control strategies for multiple instrument-used switching-mode power supply (MISMPS) in parallel with adjustable output. The MISMPS is composed of an EMI filter, a power factor corrector, a DC/DC converter, and a control system. The DC/DC converter is constructed by a phase-shifted full-bridge (PS-FB) converter with the zero-voltage-switching (ZVS) technique. The control strategy is designed to be capable of constant voltage (CV) mode and constant current (CC) mode, which are built by the voltage-adjustment control (VAC) and the current-limit control (CLC). A linear regulator (LR) is installed at the output end of the MISMPS to achieve adjustable output voltage/current with good regulation. The voltage/current master-slave active current sharing technique is used to achieve a parallel strategy in the MISMPS. A complete small signal analysis for describing the transfer functions of the master and slave modules are derived. The mathematical analysis is conducted by the Matlab and Is-spice to explore the behavior of the MISMPS to in parallel operation. Finally, a design example for realizing a MISMPS with 2+1 modules of 3kW (single module’s output is 0~50V/20A) is conducted. The proposed MISMPS can actually provide an efficiency up to 82%, a good load regulation within ±2%, and a current sharing within 3% at the full load condition of Vo=50V and Io=60A.The experiment and simulation results are close to each other and meet the theoretical predictions.
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LIN, WEI-TSO, i 林威佐. "Switching Power Supply EMI Design And EMI noise model construct". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/73371724265978927763.
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碩士華梵大學
機電工程研究所
94
The Power supply device electronic products at the today are all by according with miniaturization , high efficiency , high accuracy, trusting degree, and high response to system etc. as the goal high, dwindling greatly of the case in the making manufactory process of the circuit component too high in density, In fact the circuit have more exquisite become requirement more components will be crowded in very small space, has increased the chance interfered and noise, among them by Electromagnetic Interference (EMI) issue making people countermeasure find out the solution for the electromagnetic noise most, consider on the root cause question, it has been that electronics and system are being researched and developed and designing a big blind spot that is going to all the time for a long time, because EMI factor involved is various, the necessary relation with wider professional knowledge while dealing with as soon as. But because highly compete in the scientific and technological industry, the life cycle of the new products is shorter and shorter loop, make us have to seek one and solve EMI problem way fast, to shorten the research and development time of the products to seize the market first chance with short-term research and development. High competition industry develops in the scientific and technological skill. The life cycle of the new products is shorter and shorter. We have to seek one and solve EMI problem by the way fast, to shorten the research and development time of the products. Take the market first channel with short-term research and development. The restrain EMI filter with the conducting electromagnetic noise and radiation noise kinds of the divides, radiation EMI noise is transmitted path by the open space directly, can not be passed any transmission medium. So just only generally solve in shielding and grounding etc the ways. Conducting EMI noise, it transmitted miscellaneous news path on the power wire. Connect between will interfere each other with electric EMI produced of devices that power system each other path on the cable. For conducting EMI noise do effective control at first. We need to make effective test to examine to conducting EMI noise that the electronic element constituent. Choose component parts to design filter to prevent product focus wave noise result. This text regards probing into the conducting EMI amount and examining systematic structure and principle to do the studying of the thesis mainly subject.
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Chu, Hsin-Yu, i 朱星諭. "A STUDY OF OUTPUT ADJUSTABLE SWITCHING-MODE HIGH POWER DC POWER SUPPLY WITH HIGH EFFICIENCY AND LOW VOLTAGE REGULATION". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/57531397563916727568.
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碩士大同大學
電機工程研究所
89
The purpose of this thesis is to develop a high output power, adjustable switching-mode DC power supply with high efficiency, low ripple factor, and low voltage regulation. The system consists of a 3φ AC controller, a 3φisolating transformer, and DC output active compensating filters. The 3φ switching-mode AC controller with PWM control takes charge of the variable output voltage. A 3φ transformer used for isolating the load and source, and filtering out high frequency harmonics by its inductance effect. The DC output active compensating filter takes charges of compensating and reducing the low frequency ripple voltage that is hard filtered by classical passive LC filter. Finally a single-chip microprocessor 80196MC, with proper software is used to implement the control scheme of the system and accomplish the expectation of the low voltage regulation. In the thesis, the designs of hardware structure and software algorithm are established, the proposed switching-mode DC power supply may operate at 15KW and 0V∼130V adjustable output voltage, the efficiency is greater than 90%, voltage regulation and ripple factor are both less than 1.0%.
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WU, QI-XU, i 吳其旭. "The analysis of multi-output switching mode power supply using magamp as the post-regulator controller". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/56786011558690801866.
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LU, CHUN-HUI, i 呂俊輝. "A Research of Using Data-Mining Techniques in Manufacture Process Failure Mode--A Case Study of Switching Power Supply Manufacturers". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/66032324033933153686.
Pełny tekst źródłaStreszczenie:
碩士銘傳大學
資訊管理學系碩士在職專班
100
Due to global climate warm up, the awareness of environmental energy-saving is rising. Designer has to focus on energy-saving criteria as design the power supply equipment. Moreover, the electronic products change into light, thin, and small, result in lifting up the quality control of material and production process. The raw material used in power supply product is complicated, caused many failure roots. Under the influence of various factor interaction, increasing the complexity relatively. It is difficult to find out the process root cause as any quality variation. This study collected SPS(Switching Power Supply)repair history records, including characteristics of product, process, and failure modes to find out the reason of failure. We used the Self Organizing Map to categorize the failure types, and Decision Tree algorithm to obtain the failure rules. We then inducted the Cause and Effect Analysis Charts for affected product’s material supply failure, manufacturing failure, and research/design failure. Finally, we proposed the solution of failure problems. The results showed that power supply equipment failure is not entirely caused by manufacturing process, on the contrary material and research/design are the major causes. We took the failure phenomenon that higher than risk value of 200 as an example, the main failure causes are blow-up, OCP no good, low power factors, poor effectiveness and high-pressure protection defect. Through the failure handling mode, the hit rate of failure mode is 71%, it proved that the failure handling mode is really could be a reference of failure prediction as design or trial production on power supply product. It may also assist the online repairer quickly get the solution and prevent the problem rise again.
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Vereshchago, Eugen, Vitalii Kostiuchenko i Andrii Hrieshnov. "Calculation and analysis of dynamic properties of a soft switching converter under operation on the arc load". Thesis, 2020. http://eir.nuos.edu.ua/xmlui/handle/123456789/5025.
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Vereshchago, E. Calculation and analysis of dynamic properties of a soft switching converter under operation on the arc load / E. Vereshchago, V. Kostiuchenko, A. Hrieshnov // 40th Intern. Conf. on Electronics and Nanotechnology (ELNANO). – Kyiv : IEEE, 2020. – P. 820–825.The processes in the converter with soft switching transistors operating on an arc load are investigated. A comparative analysis of the calculated frequency characteristics of a PWM converter in normal operation with the characteristics of its linear model is presented. The features of calculating the equivalent frequency characteristics of the loop gain of switching devices are considered. The dynamic resistance of a switching power supply is estimated.
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Leng, Tian Duo, i 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, i 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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Hsieh, Ching-Hsing, i 謝慶星. "High Efficient Flyback Switching Power Supply". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31178605042133343033.
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碩士大同大學
電機工程學系(所)
93
This thesis presents the design and implement a high efficiency of low power consumption Flyback converter that designs Quasi-Resonant mode soft switching in discontinuous conduction mode (DCM). Discontinuous conduction mode transformer delivers the energy that uses inductor(L) and MOSFET’s Coss to generate resonant in MOSFET “ OFF ” status. That VDS will be reduced to low voltage (ZVS) (Even to 0V).The pulse width modulation (PWM) IC will sense the valley and turn on MOSFET in the lowest voltage valley point. This PWM IC (TEA1532) can use little components to design the Feedback control, over voltage protection (OVP), over current protection (OCP), over temperature protection (OTP) and over power protection (OPP). Finally, We will design a switching power supply with input voltage of 90Vac / 47Hz ~ 264Vac / 63Hz, Output voltage of 32Vdc and output current from Imin 0A to Imax 2.344 A ( 75W),efficiency of about 88% typical in 230Vac / 50Hz, Standby power of Pin = 0.45W @ 264Vac / 50Hz at no load that use in printer adapter and can match IEA ( International Energy Agency ) standard requirements. This thesis present a low switching loss and high efficiency green power.