Rozprawy doktorskie na temat „Planar transformers”
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Ambatipudi, Radhika. "High Frequency (MHz) Planar Transformers for Next Generation Switch Mode Power Supplies". Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20270.
Pełny tekst źródłaMui, Andrew K. "A 20 dBm 5-14 GHz power amplifier with integrated planar transformers in SiGe". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43071.
Pełny tekst źródłaIncludes bibliographical references (leaves 73-74).
The integration of radar systems has taken a long journey into the modern world. Advances in signal processing technology and integrated circuit technology have lead the way for smaller, more integrated radar systems. Specific to the hardware side of a radar, the RF generation and detection once done in one location in the radar is now being replaced by small sub-elements which combine RF generation and detection at the element level. This work describes a power amplifier that can be used at the element level. The design methodology for a single stage amplifier in a Silicon Germanium Bipolar process covering 5-14 GHz is discussed. Simulation results and measurement results closely match and show peak power outputs of 25 dBm and peak power-added efficiencies (PAE) of approximately 32 %.
by Andrew K. Mui.
S.M.
Rocha, Fabio Dalla Vecchia. "Carregador de baterias bidirecional com tranformador planar". Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/653.
Pełny tekst źródłaEste trabalho traz um estudo da aplicação do conversor Full-Bridge bidirecional como um carregador de banco de baterias em um barramento CC de fontes de energia renováveis. O problema principal destas fontes é que são sazonais e não oferecem uma continuidade de fornecimento de potência. Assim, o uso de banco de baterias, conectado a um barramento CC compartilhado com outras fontes renováveis traz contribuições na continuidade do fornecimento de energia. O conversor proposto neste trabalho visa conectar o banco de baterias ao barramento CC e ao mesmo tempo que faz a integração dos modos de carga e descarga em um único conversor. Adicionalmente, para reduzir volume, é utilizado um transformador planar que oferece alta eficiência (máximo de 99,5%) e uma reduzida relação volume/potência. O conversor foi desenvolvido para carregar um banco de baterias de 192V. No modo de descarga, ele é suado para alimentar um barramento CC de 400V com uma potência máxima de 1,34kW. Apesar do uso do conversor full-bridge não ser novidade nestes tipos de aplicação, dois fatores serviram de motivação para este trabalho: o uso do transformador planar e a tendência mundial de integração de fontes renováveis.
This work presents a study of the application of the Full-bridge bidirectional DC converter as a battery bank charger in a DC bus of renewable energy sources. The main problem is that these sources are seasonal and do not offer a continuously power supply. Thus, the use of a battery bank connected to a DC bus shared with other renewable sources brings contributions in the continuity of power supply. The converter proposed in this work aims to connect the battery bank to the DC bus at the same time it integrates the charging and discharging modes into a single converter. Additionally, to reduce the volume, it is used a planar transformer that provides high efficiency (up to 99.5%) and a reduced volume/power ratio. The converter is designed to charge a bank of batteries of 192V. At the discharge mode, it is designed to feed a 400V DC bus with maximum power of 1.34 kW. Despite the use of the full-bridge converter is not new in these types of application, two factors served as motivation for this work: the use of planar transformer and the global trend of integration of renewable sources.
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.
Pełny tekst źródłaWong, Fu Keung. "High Frequency Transformer for Switching Mode Power Supplies". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367650.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
Full Text
Kavimandan, Mandar Dilip. "Integrated Inductors". Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229637343.
Pełny tekst źródłaPanchal, Chirag. "Investigations of High Efficiency Wireless Power Transfer Systems (WPTS) for Electric Vehicles (EVs)". Thesis, Griffith University, 2018. http://hdl.handle.net/10072/380677.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Ickitidze, L. P., i A. N. Mironyuk. "Planar Superconducting Magnetic Flux Transformer with Micro- and Nanosized Branches". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35455.
Pełny tekst źródłaBodegård, Andreas. "Design of a planar transformer for a series loaded resonant converter". Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414921.
Pełny tekst źródłaKotte, Hari Babu. "High Frequency (MHz) Resonant Converters using GaN HEMTs and Novel Planar Transformer Technology". Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20894.
Pełny tekst źródłaHigh Frequency Switch Mode Power Supplies
Guo, Shaoming [Verfasser]. "Hilbert transforms and maximal operators along planar vector fields / Shaoming Guo". Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1077290233/34.
Pełny tekst źródłaFerrell, Jeremy. "Planar Magnetic Integration and Parasitic Effects for a 3 KW Bi-directional DC/DC Converter". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34836.
Pełny tekst źródłaMaster of Science
Mahamat, Ahmat Taha. "Conception, réalisation et caractérisation d'un transformateur de commande". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSES011.
Pełny tekst źródłaThis work concerns the design, realization and characterization of a control transformer for insulated gate power switches, the transformer providing galvanic isolation between driving stage and power circuits. The aim of the work was not to respond to a precise specification but to develop a new technological path for the realization of an integrable planar transformer. The main characteristics of such transformer are: - high inductance (ratio of inductance / area occupied as large as possible); - low series resistances; - a capacitive coupling between primary and secondary as small as possible. These constraints guided us to study a planar transformer with magnetic layers whose primary and secondary windings are buried in the magnetic material in order to reduce the air gap. The Face to Face structure was chosen with a 45 ° offset between primary and secondary windings. After a numerical study, windings buried in a ferrite material were fabricated separately and then assembled to give rise to the transformer. Many technological steps: femtosecond laser micromachining, copper deposits by sputtering, photolithography, planarization, chemical etching ... have been implemented. Thus, the transformer produced consists of a stack of magnetic, conductive and insulating layers. It has been characterized from very low frequencies up to several tens of MHz. The measurement results obtained are close to simulation results, the bandwidth of the transformer extending from 20 kHz to 7 MHz
Pawlas, Andrzej. "Spínaný napájecí zdroj s planárním transformátorem". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218687.
Pełny tekst źródłaTan, Zheyuan. "Four-Output Isolated Power Supply for the Application of IGBT Gate Drive". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32925.
Pełny tekst źródła
The design of the planar transformer is critical to limit the profile of the converter and the leakage phenomenon. A planar transformer fit for the inductor-less full-bridge converter is designed and analyzed in 3D FEA software. An N-port transformer model is proposed to implement the inductance matrix into the leakage inductance matrix for circuit analysis. Based on this N-port model several measurements to extract the parameters in this model are proposed, where only the impedance analyzer is needed. Finally, the effects of trace layout and encapsulation on breakdown voltage in PCB are summarized from experimental results.
Master of Science
Prasai, Anish. "Methodologies for Design-Oriented Electromagnetic Modeling of Planar Passive Power Processors". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34164.
Pełny tekst źródłaMaster of Science
Hrubý, Lukáš. "Napájecí zdroj pro vesmírné aplikace". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377071.
Pełny tekst źródłaMammadov, Anar. "Částečné výboje v elektronických zařízeních". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233491.
Pełny tekst źródłaRibeiro, de Faria Santos Kelly. "Design of a bidirectional on-board charger and a DC-DC converter for low voltage battery in Electric Vehicles". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST035.
Pełny tekst źródłaThis dissertation focuses on the integration of two power electronic converters present in the electric vehicle (EV) architecture – the DC-DC con-verter interfacing the high and low voltage batteries (400V/14V) and the onboard charger (OBC). A three-port current-fed parallel resonant topology with zero voltage switching capability is developed. The con-verter allows bidirectional power flow between the three energy sources with high efficiency in both conversion modes, DC-DC and OBC while ensuring galvanic isolation.A compact three-winding planar transformer is de-signed based on EV industry requirements, empha-sizing the minimization of leakage inductances. In this design, the unequal currentsharing phenomenon between parallel-connected layers is addressed to ensure a homogeneous cur-rent distribution and eliminate the risks of thermal hotspots formation.A 7kW experimental prototype has been con-structed and tested, validating the analysis and op-eration of the proposed topology. Some sugges-tions and propositions are provided for future work aiming at efficiency improvement of the converter
Besri, Abdelhadi. "Modélisation analytique et outils pour l'optimisation des transformateurs de puissance haute fréquence planars". Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00612344.
Pełny tekst źródłaMurillo, Carrasco Luis. "Modelling, characterisation and application of GaN switching devices". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-characterisation-and-application-of-gan-switching-devices(a227368d-1029-4005-950c-2a098a5c5633).html.
Pełny tekst źródłaKahlouche, Faouzi. "Fabrication et caractérisation de micro-transformateurs planaires à couches magnétiques". Thesis, Saint-Etienne, 2014. http://www.theses.fr/2014STET4010/document.
Pełny tekst źródłaIn aeronautics and more specifically in an all-electric aircraft, the main objective is to reduce the mass and volume of the components. For this, the electric actuators gradually replace hydraulic and mechanical actuators. These electric actuators need to be commanded; THOR project (European project supporting this thesis) aims to develop a control stage to command the power switches. The switches are located in the direct vicinity of the driver stage with an output voltage that can reach up to 3 kV hence the need for a galvanic isolation. Formerly, the opto-couplers were used to provide galvanic isolation in the control stages. However, in order to use these components in thermal constraining environment and ensure better integration, opto-couplers are no longer appropriate and are replaced by transformers. In this context, the main objective of this thesis is to develop, realize and characterize integrated planar transformers that meet the THOR specifications. At first a state of art on the different manufacturing technologies of planar transformers is established before choosing the technology and the materials used in the fabrication of our planar transformers. In a second step, we are interested in the choice and size of the transformer structure. Two structures that met the THOR specifications were selected and resized using a simulation software (HFSS). Finally, these two structures were realized and characterized using an RLC-meter at low frequency and a Vector Network Analyzer (VNA) at high frequency. For both structures, the characterization allowed to verified the magnetizing inductance greater than 1 μH desired by the THOR project and a coupling factor greater than 0,9 obtained par simulations. Other important parameters were also extracted namely the inter-winding capacity where less than few pF wasobtained and the windings resistance has been identified less than 10 Ω
Assad, Gustavo Elia. "Análise híbrida da interação mútua escoamento/campo magnético na região de entrada de um canal de placas paralelas". Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8792.
Pełny tekst źródłaMade available in DSpace on 2017-01-26T13:30:08Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 7840328 bytes, checksum: 74229a382309ea0fcf42de5818cc899a (MD5) Previous issue date: 2016-08-25
The aim of this work deals with the analysis of the mutual interaction between flow and magnetic fields that develops in a parallel-plate channel as soon as an external magnetic field is applied transversely to the plates. The fluid, electrically conductive, enters the channel under any velocity profile and will have its natural development within the channel changed by the applied magnetic field. With a coupled two-way interaction, the field will also be affected by the flow. The study of these interactions will be made from the two-dimensional version of the steady-state Navier-Stokes equations in the stream function formulation, coupled with the transport equation of the magnetic field. The solution of the governing equations will be obtained by the Generalized Integral Transform Technique (GITT). The results obtained for the velocity field, magnetic field and temperature field, as well as the associated scalar functions, are produced and compared with the literature on the basis of the main parameters of government: Reynolds number (Re), magnetic Reynolds number (Rem) and Hartmann number (Ha). In order to illustrate the consistency of the generalized integral transform technique, convergence analysis, are also performed and presented.
O objetivo do presente trabalho trata da análise da interação mútua escoamento/campo magnético que se desenvolve no interior de um canal de placas planas e paralelas ao se aplicar um campo magnético externo transversal. O fluido, eletricamente condutor, entra no canal sob um perfil qualquer de velocidade, e terá seu desenvolvimento natural afetado pelo campo magnético aplicado. Com uma interação acoplada de duas vias, o campo também será afetado pelo escoamento. O estudo dessas interações será efetuado a partir de uma formulação bidimensional das equações de Navier-Stokes, na formulação em função corrente, para escoamento em regime permanente, acoplada à equação de transporte do campo magnético. A solução das equações governantes será obtida através da Técnica da Transformada Integral Generalizada (GITT). Os resultados obtidos para o campo de velocidade e campo magnético, bem como suas funções escalares associadas, são produzidos e comparados aos da literatura em função dos principais parâmetros de governo: número de Reynolds (Re), número de Reynolds magnético (Rem) e número de Hartmann (Ha). Com o objetivo de ilustrar a consistência da técnica da transformada integral generalizada, análises de convergência são também efetuadas e apresentadas.
R?go, Maria das Gra?as Oliveira. "An?lise da magnetohidrodin?mica com transfer?ncia de calor em canais de placas paralelas via transforma??o integral". Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15631.
Pełny tekst źródłaUniversidade Federal do Rio Grande do Norte
The main goal of the present work is related to the dynamics of the steady state, incompressible, laminar flow with heat transfer, of an electrically conducting and Newtonian fluid inside a flat parallel-plate channel under the action of an external and uniform magnetic field. For solution of the governing equations, written in the parabolic boundary layer and stream-function formulation, it was employed the hybrid, numericalanalytical, approach known as Generalized Integral Transform Technique (GITT). The flow is sustained by a pressure gradient and the magnetic field is applied in the direction normal to the flow and is assumed that normal magnetic field is kept uniform, remaining larger than any other fields generated in other directions. In order to evaluate the influence of the applied magnetic field on both entrance regions, thermal and hydrodynamic, for this forced convection problem, as well as for validating purposes of the adopted solution methodology, two kinds of channel entry conditions for the velocity field were used: an uniform and an non-MHD parabolic profile. On the other hand, for the thermal problem only an uniform temperature profile at the channel inlet was employed as boundary condition. Along the channel wall, plates are maintained at constant temperature, either equal to or different from each other. Results for the velocity and temperature fields as well as for the main related potentials are produced and compared, for validation purposes, to results reported on literature as function of the main dimensionless governing parameters as Reynolds and Hartman numbers, for typical situations. Finally, in order to illustrate the consistency of the integral transform method, convergence analyses are also effectuated and presented
O prop?sito do estudo desenvolvido nesse trabalho est? relacionado com a din?mica do escoamento incompress?vel, laminar, em regime permanente, com transfer?ncia de calor, de um fluido newtoniano condutor el?trico, no interior de um canal de placas planas paralelas, submetido a um campo magn?tico externo uniforme. Para a solu??o das equa??es de governo, modeladas atrav?s da formula??o parab?lica de camada limite em fun??o corrente, foi empregado o m?todo h?brido, num?rico-anal?tico, conhecido como T?cnica da Transformada Integral Generalizada (GITT). O escoamento analisado ? sustentando por um gradiente de press?o e assume-se que o campo magn?tico externo, aplicado na dire??o normal ao escoamento, permanece uniforme, muito maior do que quaisquer outros campos gerados em outras dire??es, n?o sendo, dessa forma, influenciado por nenhum efeito magn?tico interno. Para avaliar a influ?ncia do campo magn?tico sobre o desenvolvimento t?rmico e hidrodin?mico desse problema de convec??o for?ada, e tamb?m para fins de valida??o da metodologia de solu??o adotada, foram empregados dois tipos de condi??es de contorno para o campo de velocidade na entrada no canal: perfil uniforme e perfil parab?lico do escoamento sem campo magn?tico completamente desenvolvido. Para o problema t?rmico, por outro lado, empregou-se apenas o perfil uniforme de temperatura na entrada do canal e considerou-se que as placas se mant?m ? temperatura constante, iguais ou diferentes uma da outra. Resultados para os campos de velocidade, temperatura e potenciais correlatos s?o produzidos e comparados aos da literatura em fun??o dos principais par?metros de governo, a saber, n?mero de Reynolds, n?mero de Hartmann e par?metro el?trico, para algumas situa??es t?picas. Com o objetivo de ilustrar a consist?ncia da t?cnica da transformada integral generalizada, an?lises de converg?ncia s?o tamb?m efetuadas e apresentadas
Havlíček, Tomáš. "Částečné výboje v elektronických zařízeních pracujících na vyšších kmitočtech". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233500.
Pełny tekst źródłaAlves, George Dennes Fernandes. "Antenas planares multicamadas com materiais supercondutores e fot?nico para comunica??es m?veis". Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15280.
Pełny tekst źródłaRecently, planar antennas have been studied due to their characteristics as well as the advantages that they offers when compared with another types of antennas. In the mobile communications area, the need for this kind of antennas have became each time bigger due to the intense increase of the mobile communications this sector. That needs of antennas which operate in multifrequency and wide bandwidth. The microstrip antennas presents narrow bandwidth due the loss in the dielectric generated by radiation. Another limitation is the radiation pattern degradation due the generation of surface waves in the substrate. In this work some used techniques to minimize the disadvantages (previously mentioned) of the use of microstrip antennas are presented, those are: substrates with PBG material - Photonic Bandgap, multilayer antennas and with stacked patches. The developed analysis in this work used the TTL - Transverse Transmission Line method in the domain of Fourier transform, that uses a component of propagation in the y direction (transverse to the direction real of propagation z), treating the general equations of electric and magnetic field as functions of Ey and Hy. One of the advantages of this method is the simplification of the field equations. therefore the amount of equations lesser must the fields in directions x and z be in function of components Ey and Hy. It will be presented an brief study of the main theories that explain the superconductivity phenomenon. The BCS theory. London Equations and Two Fluids model will be the theories that will give support the application of the superconductors in the microfita antennas. The inclusion of the superconductor patch is made using the resistive complex contour condition. This work has as objective the application of the TTL method to microstrip structures with single and multilayers of rectangular patches, to obtaining the resonance frequency and radiation pattern of each structure
Recentemente as antenas planares t?m despertado interesses devido ?s suas caracter?sticas, assim como pelas vantagens que oferecem quando comparadas com os demais tipos de antenas. Na ?rea de comunica??es m?veis a necessidade de antenas desse tipo tem-se tornado cada vez maior devido ao intenso crescimento desse setor, necessitando de antenas que operem em multifreq??ncia e em banda larga. As antenas de microfita apresentam largura de banda estreita devido ?s perdas no diel?trico geradas pela irradia??o. Outra limita??o ? a degrada??o do diagrama de irradia??o devido ? gera??o de ondas de superf?cie no substrato. Neste trabalho s?o apresentadas algumas t?cnicas usadas para tentar minimizar as desvantagens (citadas acima) do uso de antenas de microfita, sendo elas: substratos com material PBG - Photonic Bandgap, antenas em multicamadas e a utiliza??o de patches fabricados de materiais supercondutores. As an?lises desenvolvidas neste trabalho foram realizadas com a utiliza??o do m?todo LTT - Linha de Transmiss?o Transversa no dom?nio da transformada de Fourier, que utiliza uma componente de propaga??o na dire??o y (transversa ? dire??o real de propaga??o z), tratando assim as equa??es gerais dos campos el?tricos e magn?ticos em fun??es de Ey e Hy. Uma das vantagens desse m?todo ? a simplifica??o das equa??es de campo, pois a quantidade de equa??es ? menor devido os campos nas dire??es x e z ficarem em fun??o das componentes Ey e Hy. Ser? apresentado um breve estudo das principais teorias que explicam o fen?meno da supercondutividade. As teorias BCS, Equa??es de London e modelo dos Dois Fluidos ser?o as teorias que dar?o suporte a aplica??o dos supercondutores nas antenas microfita. A inclus?o do patch supercondutor ? feita utilizando-se a condi??o de contorno complexa resistiva. Este trabalho tem como objetivo a aplica??o do m?todo LTT ?s estruturas de microfita
Guillaume, Mathieu. "Analyse et synthèse de champs sonores". Phd thesis, Télécom ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00002383.
Pełny tekst źródłaVallabhapurapu, Hyma Harish. "Effect of dielectric thickness on the bandwidth of planar transformers". Thesis, 2017. https://hdl.handle.net/10539/25527.
Pełny tekst źródłaThis research has considered an idealistic non-interleaved planar transformer wherein only the electromagnetic parasitic capacitive and inductive elements arising out of the transformer geometry are taken into account, without considering material limitations. A suitable model for the planar transformer is used to analyse its frequency and power transfer characteristics; this model was validated by three dimensional electromagnetic simulations of various planar transformer structures in FEKO simulation software. The capacitive and inductive parasitics in this model have been found to be functions of the dielectric thickness. The theoretical bandwidth for the planar transformer is defined in this research as a function of dielectric thickness. The effect of dielectric thickness of the transformer windings on the bandwidth of the transformer is analysed, based on the premise that the inherent parasitic capacitive and inductive elements would affect the transfer characteristics of the transformer. Upon conclusion of this analysis, it is found that the dielectric thickness of a planar transformer can be optimised such as to present an optimised bandwidth. A closed form analytic expression for the optimum dielectric thickness value is derived and presented in this research. In a design example of a 4:1 50W transformer presented in this research, it has been shown that the bandwidth can be improved by 384%, along with a power density improvement of 45%, upon choosing of an optimum dielectric thickness of 0.156mm to replace a standard 0.4mm thick dielectric. It should be noted that the results derived in this research are purely theoretical, justified by many idealisations and assumptions that are argued throughout the research. It is thus expected that practical results should at best approach the theoretical results, due to the known non-ideal nature of reality.
CK2018
Hui-Fang, Lai, i 賴慧芳. "Planar Micro-Inductors and Micro-Transformers with Arrayed Magnetic Cores". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/40501141744929445653.
Pełny tekst źródła國立臺灣大學
應用力學研究所
91
In this thesis, the micro-inductors and micro-transformers with arrayed magnetic cores were devised and fabricated in two ways. First, 0.35μm 1P4M (single poly quadri-metal, SPQM) standard CMOS was used to design and fabricate micro-inductors and micro-transformers. Then, MEMS post-process was performed in order to enhance component performance. Through combination of CMOS and MEMS technology, the ultimate aim was the integration of traditional off-chip passive components and micro electronic circuits to achieve the concept of system on a chip (soc). Second, the masks were designed, and the fabrication process can be compatible with standard CMOS process. The spiral micro-inductors include 1.5, .2.5, 3.5, 5.5 turns with varying width. Finally, the thick copper metal was electroplated to reduce the resistance. In this research, highly permeability material (Ni-20% and Fe-80%) has been successfully evaporated onto the inductors. Micro-inductors and micro-transformers with arrayed magnetic cores have better inductance and quality factor than those with air core. Then the arrayed magnetic cores will enhanced the performance of micro-inductors and micro-transformers.
HSIEH, TIEN-YU, i 謝典佑. "Comparison of Power Loss of Planar Transformers for Phase-Shifted Full-Bridge Converters". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/67j5s6.
Pełny tekst źródła國立臺北科技大學
電機工程系電力電子產業碩士專班
107
The purpose of this thesis is to investigate the loss of the planar transformer which is used for phase-shifted full-bridge converter. Using ANSYS Maxwell simulation software, the leakage inductance, winding loss and core loss of the transformer with six different types are analyzed. The simulation results show that the total loss of the planar transformer with a turn ratio of 2:2 is 3.33 W, and the total loss of the interleaved winding of 3:3 is 11.38 W. The experimental results show that the phase-shifted full-bridge converter using sandwich 2:2 is 83.47 % at 60% load and the highest efficiency is 85.50 % at full load.
Imre, Tarik Gurhan. "Accurate modelling and experimental measurement of losses in planar inductors". Thesis, 2012. http://hdl.handle.net/10210/4289.
Pełny tekst źródłaLow profile power electronics components are currently in great demand. The rapid advances in semiconductor and micro-electronics technology during the last ten years have played a major role in the creation of this demand. These advances are in turn driven by the need for compact design in computing, communication, consumer electronic goods and control systems with direct consequences in power supply design and manufacture. The study covered by this thesis involves the design, manufacture and thermal analysis of a planar inductor, which is a typical planar power electronics component. First, a throughout literature survey of planar magnetics revealed that satisfactory experimental procedures for the thermal analysis of passive power electronic components under operating conditions representative of modern applications are seldomly applied. Secondly, a computer based field-solver program and analytical methods are used to design and analyse a planar inductor. The applicability of different methods for determination of low power loss in passive components is discussed next. Finally, an experimental method suitable for low power loss determination is proposed and investigated. This method can be used in the analysis of inductors or capacitors of different sizes. It has a wide spectrum of application due to the advantages of frequency independence and different possible power levels.
Luo, Mao-Hong, i 羅貿鴻. "MEMS Planar Transformer Design for RJ-45 Network Interface". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23403831056126161036.
Pełny tekst źródła中華大學
電機工程學系(所)
97
In this report, a RJ-45 filter’s design and simulate is presented, how to minimize the thickness and areas of filter bank is the crucial issue of the future high speed Ethernet devices and equipments. We will study the planar integrated transformer technology for RJ-45 filter bank of RJ-45 network product.
Wei, Tzu-Chiang, i 魏祖強. "Design and Modeling of Planar Transformer-based Integrated Passive Devices". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74963846183721571254.
Pełny tekst źródła國立中山大學
電機工程學系研究所
96
This thesis is mainly composed of two parts. The first part is to introduce the planar transformer-based circuits and their applications. The mixed-mode S parameters and the grounding effects for planar transformers are discussed. A physical model has been developed for modeling the planar transformers. In the second part, a new coil winding technique for planar transformers has been presented to realize a high-efficiency planar transformer with arbitrary turn ratio for power-split/combine and phase-shift applications. Especially, the power-split/combine architecture based on a planar transformer of cellular shape is first presented in this thesis, enabling various kinds of passive components to be widely realized using the integrated passive device processes. As an example, this thesis proposes a design procedure for high-efficiency balun component. Firstly, design a high Q transformer that considers the load impedance effects. Secondly, design the ground reference for un-balanced signal on the virtual ground symmetry axis for balanced signals. Thirdly, design impedance matching networks for minimizing un-balanced and balanced port return losses. Then, a high performance planar transformer-based balun design can be done.
林彥甫. "Study of Vertical Magnetic Field Uniformity for Planar Contactless Transformer". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55949661126052803843.
Pełny tekst źródła國立彰化師範大學
電機工程學系
101
Abstract For the sake of convenience and use of electricity and other security purposes, contactless energy transfer system has been used in a lot of various load, such as cell phone chargers. Because of cell-phone unmistakable wave of prosperity, therefore, this paper is to design contactless distribution of the transformer as the main objective of uniform magnetic field. Coil type is the common linear and helical bundles of two, and its magnetic field distribution were concave and convex distribution, respectively. As a result, it will cause non-uniform distribution of magnetic field. Therefore, in this thesis, linear and helical bundles are combined as hybrid coil, in order to perform a flatter distribution of the magnetic field. There are two charging platform is designed, some characteristic are measured, the magnetic field, mutual inductance quantity and power measurement. NoiseKen EPS-3000 is used to analysis and measured the hybrid coil field distribution, respectively. A Pick-up coil is designed to measuring power output, which the maximum output power is up to 1.2 W. The experimental results show the uniform magnetic field distribution is achieved. The prototype circuit could be used a reference guide. Keywords: Contactless Power Transfer, Hybrid Coil Design, Vertical Magnetic Field Uniform Distribution
Hsu, Yuan-Chen, i 許元禎. "Design and Implementation of a Planar Transformer-based Contactless Battery Recharger". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73311636469027335906.
Pełny tekst źródła元智大學
電機工程學系
99
The study in this thesis is related to a wireless charger system based on planar PCB windings. This wireless charger system consists of energy supply module, energy receiver and charge circuit. The planar PCB windings are used as transformers for energy transfer from the supply module to the receiver; in particular, the multilayer hexagonal PCB windings are employed to generate uniform magnetic flux over the surface of the planar PCB windings to enhance the energy transfer efficiency. The kernel technique includes the connection and arrangement of the PCB windings. In this study, the major innovative concept is to make wireless charger module scalable regardless of the load size, positions and orientation. Also provided are the equivalent circuit and model for optimal power delivery. The system is implemented and measured with DC 12V supply voltage, 100 KHz operating frequency and charging power 1.15W with delivery efficiency 8%. A test of the system is performed on a mobile phone.
Lin, Meng-Fan, i 林孟帆. "Optimization Design of Planar Transformer for High Frequency LLC Series Resonant Converters". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u9m6cr.
Pełny tekst źródła國立臺灣科技大學
電子工程系
106
Magnetic components are the main source of power losses in high step-down LLC resonant converters. Therefore, to achieve high efficiency and high power density, improving the magnetic element is an important issue. Ferrite cores with high permeability and low core loss are widely used in high-frequency switching power supplies. The core loss mainly results from hysteresis loss and eddy current loss. Therefore, this thesis aims to analyze and optimize the structure of ferrite cores using Maxwell software to implement the Finite Element Method (FEM). Changing the distribution of magnetic flux density to reduce core loss results in a tradeoff design between the volume and loss of magnetic core. Then, the transformer can be optimized to achieve high circuit efficiency. Finally, a 750-W LLC resonant converter prototype with specifications of 380-V input voltage, 12-V output voltage, and 500-kHz switching frequency is implemented and tested to verify the feasibility of different architectures on transformer cores.
Yang, Chi-Hsiang, i 楊智翔. "Development of contactless battery power transfer system with coreless PCB planar transformer". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/vyq347.
Pełny tekst źródła國立彰化師範大學
電機工程學系
107
In this study, a contactless power transmission system based on a coreless PCB transformer is developed for the application of the electric scooter’s battery charging. The overall system is mainly divided into two parts: a charging end module and a battery end module. The two windings of the PCB transformer are integrated into the charging and battery modules respectively. The overall size of the modules and the core power losses can be reduced by using the coreless PCB transformer. The LCL resonance compensation topology for the coreless PCB transformer is adopted for the future development of bidirectional power conversion. On the secondary side, the full-bridge diode rectifier is used to convert the high-frequency AC power into a DC power source. After analyzing and simulating the characteristics of the LCL resonance compensation topology, it can be found that the secondary side output current is also almost constant when the primary side voltage is fixed. As a result, a DC converter is integrated into the secondary side to control the battery charging power. In the proposed control strategy, the control signal transmission between the primary and secondary sides is not required, which can reduce the system cost and the controller complexity. A prototype with 100W rated power of the proposed contactless power transmission system is implemented. The input 48V DC power is converted into 12V power for charging the battery. The constant-current/constant-voltage charging method with 14.4V/6.9A is adopted. The efficiency of the developed system is about 71% for the battery charging. From the experimental results, the validity and performance of the proposed system are both verified.
Hsu, Yen-ta, i 許嚴達. "Design of a Boost Power Factor Correction AC/DC Converter using Planar Ferrite Core Transformer". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91685614145799695668.
Pełny tekst źródła國立中央大學
電機工程學系在職專班
101
With the requirement of Power Factor (PF) are being set to standards, commercial electrical products must pass globally recognized standards such as the European EN61000-3-2 and the Energy Star Program Requirements to be sold around the globe. Under the consideration for minimum Total Harmonic Distortion (THD) and maximum PF, the Boost Power Factor Correction (PFC) topology is used to meet the demands for applications with a 400 V high voltage output. To take advantage in the recent advance in planar passive components, a planar ferrite core transformer is used with the proposed Boost PFC circuit, which allows high power density and decreases the overall volume of the system. This thesis begins with the discussion regarding the relationship and physical significance between THD and PF. Comparisons between passive and active PFC circuits, Buck PFC circuits and Boost PFC circuits, single stage PFC circuits and multi stage PFC circuits, are given respectively. This thesis also compares the differences in circuit operation regarding the continuity of transformer current. The operations of each circuit blocks are given in detail, and a small-signal model is derived for analysis. The metal core planar transformer technology is also introduced. Finally, in order to verify the design proposed in this thesis, circuit simulation and actual measurement are conducted. Simulation results suggest that the proposed PFC circuit provides sufficient PF and THD ratings for many major international standards under various input voltage and output loading conditions. Its high power conversion efficiency also satisfies the need for commercial electrical products requiring high input voltage and demands high power consumption.
Hung, Ruei-Chian, i 洪瑞謙. "Design and Analysis of Planar Transformer for GaN-based High Switching Frequency Half-Bridge Resonant Converter". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8zb2x7.
Pełny tekst źródła國立臺北科技大學
電機工程系電力電子產業碩士專班
106
The purpose of this thesis is to investigate the parasitic capacitance and stray inductance of planar transformer which is used for GaN-based high frequency half bridge converter. The parasitic capacitance and stray inductance will result in more relevant loss and high spike under high switching frequency operation. To solve these issues, planar transformer is designed and its parasitic capacitance and stray inductance are analyzed using finite element tools.The designed and analyzed results are confirmed by measured results. A half-bridge resonant converter using GaN devices and the designed planar transformer is implemented and controlled by digital controller. The design specifications of half bridge resonant converter include: input DC voltage of 400V, output voltage of 12V, total power rating of 600W, switching frequency of 480 kHz ~ 620 kHz. Simulation and experimental results show that the maximum efficiency is up to 95.79%. These results confirm the design and implementation.
Lu, De-Jia, i 盧德嘉. "Design and Implementation of a Novel Half -Turn Planar Transformer for High power Density LLC Resonant Converter". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8ydjc3.
Pełny tekst źródła國立臺灣科技大學
電子工程系
107
This paper proposes an isolated DC-DC converter for cloud servers. With a switching frequency in the range of MHz, an LLC resonant converter is selected that can achieve zero voltage switching over the full load range. It replaces the traditional switch components with wide bandgap devices, like GaN, to reduce the turn-off loss of the power components. This paper proposes a new half-turn transformer structure, which uses magnetic flux cancellation to reduce the core loss. The secondary winding is a half-turn to achieve a fractional winding that maintains a winding ratio of 16:1. Solving the problem of increasing the volume of the fractional-circle transformer in previous research, the new half-turn transformer can simultaneously achieve the goal of reducing core loss and volume while increasing power density. Parametric form is used to calculate the core loss and copper loss to achieve an optimized design in the limited circuit layout area. The magnetic simulation software Maxwell of ANSYS is used to verify the circuit behavior with a planner transformer, which conforms to the previous design theory. Finally, the implemented 800-W LLC resonant converter with the proposed design switches at 1 MHz, has an input voltage of 380 V and an output voltage of 12 V, achieves a maximum efficiency of 95.21%, and has a power density of 55 W/cm3.
Wu, Zheng-yan, i 吳政彥. "Design and Modeling of Three-Port Passive Devices Using a Planer Transformer with Unequal-Turn Windings". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/6ukcye.
Pełny tekst źródła國立中山大學
通訊工程研究所
97
This thesis at first introduces planar transformers and their applications to RF circuits. A method is given to validate the impedance transformation and calculate the insertion loss for a transformer with unequal turn windings. A physical lumped-element model has been established for a planar transformer-based balun implemented using integrated passive device technology. This thesis next presents CMOS power combiner designs with two differential ports and one single-ended port. Such designs equivalently integrate two baluns and one single-ended power combiner into a single circuit and therefore have the advantages of saving chip area and reducing insertion loss. In addition, the designs consider an annular ground structure to achieve lower insertion loss or better balance property. Finally, this thesis presents a balun using a stacked coil transformer in an organic build-up substrate. For this purpose, a complete design flow and an impedance matching technique have been given.
Li, Hongliang. "Characterization of carotid artery plaques using noninvasive vascular ultrasound elastography". Thèse, 2019. http://hdl.handle.net/1866/23538.
Pełny tekst źródłaAtherosclerosis is a complex vascular disease that affects artery walls (by thickening) and lumens (by plaque formation). The rupture of a carotid artery plaque may also induce ischemic stroke and complications. Despite the use of several medical imaging modalities to evaluate the stability of a plaque, they present limitations such as irradiation, invasive property, low clinical availability and high cost. Ultrasound is a safe imaging method with a real time capability for assessment of biological tissues. It is clinically used for early screening and diagnosis of carotid artery plaques. However, current vascular ultrasound technologies only identify the morphology of a plaque in terms of echo brightness or the impact of the vessel narrowing on flow properties, which may not be sufficient for optimum diagnosis. Noninvasive vascular elastography (NIVE) has been shown of interest for determining the stability of a plaque. Specifically, NIVE can determine the strain field of the moving vessel wall of a carotid artery caused by the natural cardiac pulsation. Due to Young’s modulus differences among different vessel tissues, different components of a plaque can be detected as they present different strains thereby potentially helping in characterizing the plaque stability. Currently, sub-optimum performance and computational efficiency limit the clinical acceptance of NIVE as a fast and efficient method for the early diagnosis of vulnerable plaques. Therefore, there is a need to further develop NIVE as a non-invasive, fast and low computational cost imaging tool to better characterize the plaque vulnerability. The procedure to perform NIVE analysis consists in image formation and image post-processing steps. This thesis aimed to systematically improve the accuracy of these two aspects of NIVE to facilitate predicting carotid plaque vulnerability. The first effort of this thesis has been targeted on improving the image formation (Chapter 5). Transverse oscillation beamforming was introduced into NIVE. The performance of transverse oscillation imaging coupled with two model-based strain estimators, the affine phase-based estimator (APBE) and the Lagrangian speckle model estimator (LSME), were evaluated. For all simulations and in vitro studies, the LSME without transverse oscillation imaging outperformed the APBE with transverse oscillation imaging. Nonetheless, comparable or better principal strain estimates could be obtained with the LSME using transverse oscillation imaging in the case of complex and heterogeneous tissue structures. During the acquisition of ultrasound signals for image formation, out-of-plane motions which are perpendicular to the two-dimensional (2-D) scan plane are existing. The second objective of this thesis was to evaluate the influence of out-of-plane motions on the performance of 2-D NIVE (Chapter 6). For this purpose, we designed an in vitro experimental setup to simulate out-of-plane motions of 1 mm, 2 mm and 3 mm. The in vitro results showed more strain estimation artifacts for the LSME with increasing magnitudes of out-of-plane motions. Even so, robust strain estimations were nevertheless obtained with 2.0 mm out-of-plane motion (correlation coefficients higher than 0.85). For a clinical dataset of 18 participants with carotid artery stenosis, we proposed to use two datasets of scans on the same carotid plaque, one cross-sectional and the other in a longitudinal view, to deduce the out-of-plane motions (estimated to be ranging from 0.25 mm to 1.04 mm). Clinical results showed that strain estimations remained reproducible for all motion magnitudes since inter-frame correlation coefficients were higher than 0.70, and normalized cross-correlations between radiofrequency images were above 0.93, which indicated that confident motion estimations can be obtained when analyzing clinical dataset of carotid plaques using the LSME. Finally, regarding the image post-processing component of NIVE algorithms to estimate strains of vessel walls from reconstructed images with the objective of identifying soft and hard tissues, we developed a strain estimation method with a pixel-wise resolution as well as a high computation efficiency for improving NIVE (Chapter 7). We proposed a sparse model strain estimator (SMSE) for which the dense strain field is parameterized with Discrete Cosine Transform descriptions, thereby deriving affine strain components (axial and lateral strains and shears) without mathematical derivative operations. Compared with the LSME, the SMSE reduced estimation errors in simulations, in vitro and in vivo tests. Moreover, the sparse implementation of the SMSE reduced the processing time by a factor of 4 to 25 compared with the LSME based on simulations, in vitro and in vivo results, which is suggesting a possible implementation of NIVE in real time.