Academic literature on the topic 'Converters CC'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Converters CC.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Converters CC"
1
P. França, Rodrigo, Fabrício Hoff Dupont, and José Renes Pinheiro. "ORIGIN OF THE STABILITY PROBLEM OF DC-DC CONVERTERS CASCADE CONNECTED." Eletrônica de Potência 25, no. 3 (August 11, 2020): 293–304. http://dx.doi.org/10.18618/rep.2020.3.0024.
Full text
2
Santana, Fernando, Thiago Santana, Arlete Vieira da Silva, and Mário Marcos Brito Horta. "CONVERSOR DE FREQUÊNCIA CC-CA." e-xacta 6, no. 1 (May 30, 2013): 75. http://dx.doi.org/10.18674/exacta.v6i1.883.
Full textAbstract:
<p align="justify">Conversores ou inversores de frequência são equipamentos capazes de modificar a forma da energia aplicada à sua entrada para obter novas formas da energia na saída, a fim de atender as exigências de funcionamento de outro equipamento ou dispositivo que se deseja trabalhar. A proposta deste artigo é elaborar um conversor de frequência da forma mais simples e econômica possível, mas que seja funcional e aplicável às necessidades de mercado. Sua funcionalidade e eficiência foram demonstradas na prática através da construção de um protótipo.</p><p align="justify">Abstract</p><p align="justify">Frequency Converters or inverters are devices capable of modifying the shape of the energy applied its entry to obtain new forms of output energy in other to answer the working requirements of another machine or device that you want to work. The purpose of this article is to develop a frequency converter in the simplest and more economical way, therefore it has to be useful and applicable to the market needs. Its functionality and efficiency were demonstrated in practice through a prototype.</p>
3
Zientarski, Jonatan, Mário Martins, José Pinheiro, and Hélio Hey. "Partial Power Processing On Dc/dc Converters Connected As Series Regulators." Eletrônica de Potência 22, no. 2 (June 1, 2017): 196–205. http://dx.doi.org/10.18618/rep.2017.2.2673.
Full text
4
Luiz da Silva Júnior, Rogério, Mauricio Dalla Vecchia, André Luís Kirsten, and Telles Brunelli Lazzarin. "Contributions to the current programmed mode (CPM) Control Applied to DC-DC Converters." Eletrônica de Potência 26, no. 2 (June 30, 2021): 1–11. http://dx.doi.org/10.18618/rep.2021.2.0072.
Full text
5
Buerger, Roberto, Frederico Costa dos Santos, Murilo Scarpa Sitonio, Denizar Cruz Martins, and Roberto Francisco Coelho. "CONTROL AND STABILITY ANALYSIS OF DC-DC CONVERTERS UNDER POWER SHARING MODE." Eletrônica de Potência 24, no. 1 (February 1, 2018): 56–65. http://dx.doi.org/10.18618/rep.2019.1.0039.
Full text
6
Luqman, Muhammad, Gang Yao, Lidan Zhou, Di Yang, and Anil Lamichhane. "Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS." E3S Web of Conferences 118 (2019): 02065. http://dx.doi.org/10.1051/e3sconf/201911802065.
Full textAbstract:
Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.
7
Hariya, Akinori, Ken Matsuura, Hiroshige Yanagi, Satoshi Tomioka, Yoichi Ishizuka, and Tamotsu Ninomiya. "Considerations of Physical Design and Implementation for 5 MHz-100 W LLC Resonant DC-DC Converters." Active and Passive Electronic Components 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/4027406.
Full textAbstract:
Recently, high power-density, high power-efficiency, and wide regulation range isolated DC-DC converters have been required. This paper presents considerations of physical design and implementation for wide regulation range MHz-level LLC resonant DC-DC converters. The circuit parameters are designed with 3–5 MHz-level switching frequency. Also, the physical parameters and the size of the planar transformer are optimized by using derived equations and finite element method (FEM) with Maxwell 3D. Some experiments are done with prototype LLC resonant DC-DC converter using gallium nitride high electron mobility transistors (GaN-HEMTs); the input voltage is 42–53 V, the reference output voltage is 12 V, the load current is 8 A, the maximum switching frequency is about 5 MHz, the total volume of the circuit is 4.1 cm3, and the power density of the prototype converter is 24.4 W/cc.
8
Seman, Laio Oriel, Giancarlo Gomes, and Romeu Hausmann. "CC-CCjs: A JavaScript Web Based Application for Education on Basic Converters." IEEE Latin America Transactions 13, no. 8 (August 2015): 2715–22. http://dx.doi.org/10.1109/tla.2015.7332154.
Full text
9
Altaee, Omar Talal Mahmood, and Ahmed M. T. Ibraheem Alnaib. "Comparative Analysis of Various Multicarrier Modulation Techniques for Different Multilevel Converters." Journal of Engineering 24, no. 12 (December 3, 2018): 45–59. http://dx.doi.org/10.31026/j.eng.2018.12.05.
Full textAbstract:
The applications of Multilevel Converter (MLC) are increased because of the huge demand for clean power; especially these types of converters are compatible with the renewable energy sources. In addition, these new types of converters have the capability of high voltage and high power operation. A Nine-level converter in three modes of implementation; Diode Clamped-MLC (DC-MLC), Capacitor Clamped-MLC (CC-MLC), and the Modular Structured-MLC (MS-MLC) are analyzed and simulated in this paper. Various types of Multicarrier Modulation Techniques (MMTs) (Level shifted (LS), and Phase shifted (PS)) are used for operating the proposed Nine level - MLCs. Matlab/Simulink environment is used for the simulation, extracting, and analysis the results. Finally, a comparison is made between the results for all topologies that are implemented regarding to the criteria of the output voltage waveforms harmonic distortion factor, No. of the necessitated power components, and the complexity of each circuit. Based on simulation results, the MS-MLC is finer as compared to the other types of MLCs. It also observed that the MLCs (with three types) using Phase Opposition Disposition (POD) technique is performed better in terms of getting greater fundamental output voltage and lower THD% as compared to the other techniques.
10
Artur Alves Dias, José, Euzeli Cipriano dos Santos Júnior, and Cursino Brandão Jacobina. "Single-phase To Three-phase Converters With Dc Link Voltage- Review, Proposal And Comparison Multicriteria." Eletrônica de Potência 15, no. 1 (February 1, 2010): 1–10. http://dx.doi.org/10.18618/rep.2010.1.001010.
Full textDissertations / Theses on the topic "Converters CC"
1
Garcia, Fellipe Saldanha. "Conversores CC-CC elevadores de tensão, não isolados, com ganhos estáticos elevados." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259307.
Full textAbstract:
Orientador: José Antenor PomilioDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-16T18:42:35Z (GMT). No. of bitstreams: 1 Garcia_FellipeSaldanha_M.pdf: 10358371 bytes, checksum: 43197de07c314068d99689affe6298a7 (MD5) Previous issue date: 2010
Resumo: Os conversores CC-CC possuem importantes aplicações no aproveitamento de fontes renováveis de energia elétrica e nos veículos elétricos. Nestas aplicações, muitas vezes é desejável que o conversor opere com elevado ganho de tensão. Esta dissertação investiga topologias de conversores CC-CC não isolados, que possuem potencial de trabalhar com elevado ganho de tensão. Uma das topologias estudadas, o interleaved double dual boost, é utilizado parademonstrar as técnicas de projeto e controle do conversor. São apresentados resultados experimentais para este conversor.
Abstract: The DC-DC converters have important applications in the electric energy generation using renewable energy sources and in the electric vehicles. In those applications, it is often required that the converter operates with high voltage gain. This work investigates some non-insulated topologies of DC-DC converters that can be used when high voltage gain is necessary or convenient. One of the studied topologies, the six-phase interleaved double dual boost, is used to demonstrate the design and control techniques. Experimental results for this converter are presented.
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
2
Paz, Rafael Rodrigues da [UNESP]. "Análise e modelação de perdas em conversores CC-CC do tipo Boost entrelaçados." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/87286.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:22:36Z (GMT). No. of bitstreams: 0
Previous issue date: 2014-01-20Bitstream added on 2014-06-13T20:27:27Z : No. of bitstreams: 1
paz_rr_me_bauru.pdf: 1210657 bytes, checksum: dda81099a2ae7f6313bd197c95e5e2ab (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho consiste em realizar a análise de topologias de conversores CC-CC chaveados elevadores, com elevado ganho, para servirem de estágio de entrada em aplicações de sistemas de energias alternativas. As arquiteturas dos conversores são analisados e comparadas com relação aos seus aspectos construtivos e operacionais, incluindo os esforços de tensão e corrente nos interruptores e a característica da forma da onda de corrente drenada da fonte de alimentação. Os conversores elevadores avaliados na proposta são construídos empregando técnicas de arquitetura celular, considerando a associação paralela das células de potência de conversores elevadores, especificamente a célula Boost. Os modos de operação são analisados considerando o modo de condução contínua, modo de condução crítica e modo de condução descontínua. Para a associação paralela, a operação das células de potência é delimitada através da técnica de entrelaçamento. Os comportamentos dos conversores são avaliados considerando o desenvolvimento de modelos baseados na estratégia de modelação por valores médios, e ratificados por simulações computacionais
The goal of this work is to develop the analysis and modeling of step-up switched DC-DC converters architectures, with high gain, to serve as input stage in renewable energy systems applications. The power converter architectures are analyzed and compared with respect to their construction and operational aspects, including voltage and current stresses in the switches and the characteristic of the current waveform draw from the power source. The step-up converters are constructed using cellular archiecture, considering the parallel association of power cells, specifically the Boost power cell. The operating modes are analyzed considering continuous conduction mode, discontinuous conduction mode and critical conductional mode. In parallel association, the operation of power cells is performed using interleaved technique. The behavior of the converters are evaluated considering the development of models based on average modeling strategy averages, and ratified by computer simulations
3
Paz, Rafael Rodrigues da. "Análise e modelação de perdas em conversores CC-CC do tipo Boost entrelaçados /." Bauru, 2014. http://hdl.handle.net/11449/87286.
Full textAbstract:
Orientador: Flávio Alessandro Serrão GonçalvesCoorientador: Diego Colón
Banca: Claudionor Francisco do Nascimento
Banca: Paulo José Amaral Serni
Resumo: O objetivo deste trabalho consiste em realizar a análise de topologias de conversores CC-CC chaveados elevadores, com elevado ganho, para servirem de estágio de entrada em aplicações de sistemas de energias alternativas. As arquiteturas dos conversores são analisados e comparadas com relação aos seus aspectos construtivos e operacionais, incluindo os esforços de tensão e corrente nos interruptores e a característica da forma da onda de corrente drenada da fonte de alimentação. Os conversores elevadores avaliados na proposta são construídos empregando técnicas de arquitetura celular, considerando a associação paralela das células de potência de conversores elevadores, especificamente a célula Boost. Os modos de operação são analisados considerando o modo de condução contínua, modo de condução crítica e modo de condução descontínua. Para a associação paralela, a operação das células de potência é delimitada através da técnica de entrelaçamento. Os comportamentos dos conversores são avaliados considerando o desenvolvimento de modelos baseados na estratégia de modelação por valores médios, e ratificados por simulações computacionais
Abstract: The goal of this work is to develop the analysis and modeling of step-up switched DC-DC converters architectures, with high gain, to serve as input stage in renewable energy systems applications. The power converter architectures are analyzed and compared with respect to their construction and operational aspects, including voltage and current stresses in the switches and the characteristic of the current waveform draw from the power source. The step-up converters are constructed using cellular archiecture, considering the parallel association of power cells, specifically the Boost power cell. The operating modes are analyzed considering continuous conduction mode, discontinuous conduction mode and critical conductional mode. In parallel association, the operation of power cells is performed using interleaved technique. The behavior of the converters are evaluated considering the development of models based on average modeling strategy averages, and ratified by computer simulations
Mestre
4
Ribes, Mallada Úrsula. "Optimización del diseño de convertidores de potencia CC-CC." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/368174.
Full textAbstract:
L'electrònica ha experimentat una gran evolució durant les últimes dècades. El número de dispositius i aplicacions electrònics ha augmentat exponencialment fins a convertir-se en elements indispensables de la nostra vida quotidiana. Concretament, en el campo de l’electrònica de potencia, els convertidores commutats CC-CC, àmpliament utilitzats en els sistemes d’alimentació d’ equips electrònics, requereixen d’una eficiència elevada.
Així, en la tesis es presenta un nou mètode per al disseny de convertidors CC-CC que optimitza una funció objectiu no lineal amb restriccions no lineals.
El model desenvolupat aborda, en la majoria dels casos, un problema que consisteix en el disseny òptim de mínimes pèrdues, es a dir, màxima eficiència. A pesar d’això, també es presenta, a mode d’exemple, el disseny òptim de convertidors maximitzant l’ample de banda. Es pretén mostrar així la facilitat amb que pot ser modificat el programa de disseny. El problema ha estat modelat com un programa de Programació Geomètrica per aprofitar les avantatges que ofereix l’optimització convexa.L'electrònica ha experimentat una gran evolució durant les últimes dècades. El número de dispositius i aplicacions electrònics ha augmentat exponencialment fins a convertir-se en elements indispensables de la nostra vida quotidiana. Concretament, en el campo de l’electrònica de potencia, els convertidores commutats CC-CC, àmpliament utilitzats en els sistemes d’alimentació d’ equips electrònics, requereixen d’una eficiència elevada.
Així, en la tesis es presenta un nou mètode per al disseny de convertidors CC-CC que optimitza una funció objectiu no lineal amb restriccions no lineals.
El model desenvolupat aborda, en la majoria dels casos, un problema que consisteix en el disseny òptim de mínimes pèrdues, es a dir, màxima eficiència. A pesar d’això, també es presenta, a mode d’exemple, el disseny òptim de convertidors maximitzant l’ample de banda. Es pretén mostrar així la facilitat amb que pot ser modificat el programa de disseny. El problema ha estat modelat com un programa de Programació Geomètrica per aprofitar les avantatges que ofereix l’optimització convexa.La electrónica ha experimentado una gran evolución en las últimas décadas. El número de dispositivos y aplicaciones electrónicas ha aumentado exponencialmente hasta convertirse en elementos indispensables en nuestra vida cotidiana. Concretamente, en el campo de la electrónica de potencia, los convertidores conmutados CC-CC, ampliamente utilizados en los sistemas de alimentación de equipos electrónicos, requieren de una eficiencia elevada. Así, en la tesis se presenta un nuevo método para el diseño de convertidores CC-CC que optimiza una función objetivo no lineal con restricciones no lineales. El modelo desarrollado aborda, en la mayoría de los casos, un problema que consiste en el diseño óptimo de mínimas pérdidas, es decir, máxima eficiencia. Sin embargo, también se presenta, a modo de ejemplo, el diseño óptimo de convertidores maximizando el ancho de banda. Se pretende mostrar así la facilidad con que puede ser modificado el programa de diseño. El problema ha sido modelado como un programa de Programación Geométrica para aprovechar las ventajas que ofrece la optimización convexa.
The electronics has evolved greatly in recent decades. The number of electronic devices and applications has grown exponentially to become indispensable in our daily lives. Specifically, in the field of power electronics, the power converters DC-DC, widely used in supply systems of electronic equipment, require a high efficiency. Thus, the thesis presents a new method for the design of DC-DC converters to optimize nonlinear objective function with nonlinear constraints. The model developed presented, in most cases, a problem which consists in the optimum design of minimum losses. However, also presents the optimal design of converters maximizing bandwidth. And is intended to show how easy it can be modified the design program. The problem is modelled as a Geometric Programming problem to exploit the advantages of convex optimization.
5
Natume, Humberto Kazuo. "Estratégia de geração de barramentos CC simétricos isolados, para inversores NPC, com conversor CC-CC trifásico série ressonante." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2671.
Full textAbstract:
Este trabalho apresentou a análise e a implementação prática do conversor CC-CC trifásico série ressonante operando no modo ZCS. A estrutura deste conversor foi modificada a fim de gerar um barramento CC isolado em alta frequência com tensões simetricamente divididas. Com base na teoria de retificadores multipulsos, a ponte de Graetz do estágio de saída do conversor CC-CC foi substituída por dois retificadores trifásicos, em ponte completa, conectados em série. O transformador isolador também necessitou de alterações, no sentido de alimentar isoladamente esses retificadores, conferindo independência ao funcionamento dos mesmos. Com isso, conseguiu-se grampear cada uma das saídas dos retificadores em uma tensão proporcional a tensão de alimentação do conversor, sem o uso de controladores. Nesse aspecto, o objetivo de gerar um barramento simétrico, propício à alimentação de inversores multiníveis do tipo NPC foi plenamente satisfeito. Demonstrou-se que a estratégia de geração de um barramento com tensões simetricamente divididas pode ser estendida a inversores com mais do que três níveis, caso do NPC. Todos os resultados teóricos foram confirmados através da implementação de um protótipo de 2 kW que atingiu um rendimento superior a 95%.This work presents the analysis and practical implementation of the three-phase resonant series CC-CC converter operating in ZCS mode. The structure of this converter has been modified in order to generate a DC bus insulated at high frequency with symmetrically divided voltages. Based on the theory of multipulse rectifiers, the Graetz bridge of the output stage of the DC-DC converter has been replaced by two full-bridge three-phase rectifiers connected in series. The isolating transformer also needed changes, in the sense of feeding these rectifiers in isolation, giving independence to the operation of the same. As a result, each of the rectifier outputs was stapled to a voltage proportional to the drive voltage, without the use of controllers. In this respect, the objective of generating a symmetrical bus, suitable for feeding NPC multilevel inverters, was fully satisfied. It has been shown that the strategy of generating a bus with symmetrically divided voltages can be extended to inverters with more than three levels, in the case of the NPC. All theoretical results were confirmed by the implementation of a 2 kW prototype that achieved an efficiency of over 95%.
6
Yoshimura, Victor Leonardo [UNESP]. "Estabilidade, desempenho e observação de estado de sistemas chaveados afins: aplicações aos conversores CC-CC." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/100295.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:30:49Z (GMT). No. of bitstreams: 0
Previous issue date: 2013-10-25Bitstream added on 2014-06-13T19:46:56Z : No. of bitstreams: 1
yoshimura_vl_dr_ilha.pdf: 20355281 bytes, checksum: 3940d4cd88accd5b22ddd0f62457078b (MD5)Este trabalho aborda os Sistemas Chaveados Afins, em particular com questões de desempenho e observação de estado. Inicialmente, uma revisão do estado da arte foi realizada, que contém uma observação quanto à possibilidade de não existência de pontos de equilíbrio. Devido a esse fato, uma extensão das definições de estabilidade foi utilizada. Em seguida, questões geométricas foram levantadas para Sistemas Chaveados Lineares e, posteriormente estendidas para os Afins. Estas questões geométricas possibilitaram a verificação de alterações nas leis de chaveamento de forma a beneficiar o desempenho do sistema. Com a inserção da taxa de convergência garantida nas Desigualdades Matriciais Lineares existentes em trabalhos anteriores, chegou-se ao estabelecimento dos parâmetros de desempenho a serem aperfeiçoados. Na sequência, a composição de leis de chaveamento foi proposta através duas técnicas: a Função de Lyapunov Quadrática Chaveada e a Função de Lyapunov com Atratores Chaveados. Esta composição mostrou-se eficiente para a busca de um melhor compromisso entre parâmetros de desempenho conflitantes e, com efeito, pode melhorar um e outro parâmetro conflitantes. Por fim, uma técnica para a observação de estado em Sistemas Chaveados Afins foi proposta: o Observador de Luenberger Chaveado. Este observador foi analisado para os casos de reconstrução de estado, controle baseado em observação de estado e controle baseado em observação de estado na presença de modos não-Hurwitz. Para o primeiro caso, relaxações das Desigualdades Matriciais Lineares foram propostas com o uso do Lema da Projeção Recíproca e do Lema de Finsler. Ainda, uma otimização de norma das matrizes de ganho da saída foi feita, com o uso de Desigualdades Matriciais Lineares aplicadas à norma de Frobenius dessas matrizes...
This work deals with the Switched Affine Systems, particularly with their performance and state observation. Initially, a state-of-the-art review was developed, where an important point was raised on the possibility of absence of equilibrium points. This way, the stability concept was slightly modified. Then, geometrical questions were studied for the Switched Linear Systems and, subsequently extended for the Switched Affine Systems. Those geometrical questions allowed the verification of switching law alterations in such a way that their performance was enhanced. Thereofore, with the guaranteed convergence rate insertion in the existent LinearMatrix Inequalities in previous works, performance parameters to be increased were established. Following, a switching law composition method was proposed through two techniques: the Switched Quadratic Lyapunov Function and the Lyapunov Function with Switched Attractors. That composition showed itself efficient in a search for a better trade-off between conflicting performance parameters and, in fact, it may simultaneously enhance them. Finally, a technique for state observation in Switched Affine Systems was proposed: the Switched Luenberger Observer. This observer was analysed for the cases of state reconstruction, observer-based control and observer-based control in the presence of non-Hurwitz modes. For the first case, Linear Matrix Inequalities relaxations were proposed through the usage of the Reciprocal Projection Lemma and the Finsler’s Lemma. Yet, a norm optimization of the output gain matrices was achieved through the usage of Linear Matrix Inequalities applied to the Frobenius norm of those matrices. All the study was done with applications to the control of DC-DC converters, immediate examples of the Switched Affine Systems theory, given their nature
7
Yoshimura, Victor Leonardo. "Estabilidade, desempenho e observação de estado de sistemas chaveados afins: aplicações aos conversores CC-CC /." Ilha Solteira, 2013. http://hdl.handle.net/11449/100295.
Full textAbstract:
Orientador: Edvaldo AssunçãoBanca: Marcelo Carvalho Minhoto Teixeira
Banca: Rodrigo Cardim
Banca: Clóvis Antonio Petry
Banca: Cristiano Quevedo Andrea
Resumo: Este trabalho aborda os Sistemas Chaveados Afins, em particular com questões de desempenho e observação de estado. Inicialmente, uma revisão do estado da arte foi realizada, que contém uma observação quanto à possibilidade de não existência de pontos de equilíbrio. Devido a esse fato, uma extensão das definições de estabilidade foi utilizada. Em seguida, questões geométricas foram levantadas para Sistemas Chaveados Lineares e, posteriormente estendidas para os Afins. Estas questões geométricas possibilitaram a verificação de alterações nas leis de chaveamento de forma a beneficiar o desempenho do sistema. Com a inserção da taxa de convergência garantida nas Desigualdades Matriciais Lineares existentes em trabalhos anteriores, chegou-se ao estabelecimento dos parâmetros de desempenho a serem aperfeiçoados. Na sequência, a composição de leis de chaveamento foi proposta através duas técnicas: a Função de Lyapunov Quadrática Chaveada e a Função de Lyapunov com Atratores Chaveados. Esta composição mostrou-se eficiente para a busca de um melhor compromisso entre parâmetros de desempenho conflitantes e, com efeito, pode melhorar um e outro parâmetro conflitantes. Por fim, uma técnica para a observação de estado em Sistemas Chaveados Afins foi proposta: o Observador de Luenberger Chaveado. Este observador foi analisado para os casos de reconstrução de estado, controle baseado em observação de estado e controle baseado em observação de estado na presença de modos não-Hurwitz. Para o primeiro caso, relaxações das Desigualdades Matriciais Lineares foram propostas com o uso do Lema da Projeção Recíproca e do Lema de Finsler. Ainda, uma otimização de norma das matrizes de ganho da saída foi feita, com o uso de Desigualdades Matriciais Lineares aplicadas à norma de Frobenius dessas matrizes... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work deals with the Switched Affine Systems, particularly with their performance and state observation. Initially, a state-of-the-art review was developed, where an important point was raised on the possibility of absence of equilibrium points. This way, the stability concept was slightly modified. Then, geometrical questions were studied for the Switched Linear Systems and, subsequently extended for the Switched Affine Systems. Those geometrical questions allowed the verification of switching law alterations in such a way that their performance was enhanced. Thereofore, with the guaranteed convergence rate insertion in the existent LinearMatrix Inequalities in previous works, performance parameters to be increased were established. Following, a switching law composition method was proposed through two techniques: the Switched Quadratic Lyapunov Function and the Lyapunov Function with Switched Attractors. That composition showed itself efficient in a search for a better trade-off between conflicting performance parameters and, in fact, it may simultaneously enhance them. Finally, a technique for state observation in Switched Affine Systems was proposed: the Switched Luenberger Observer. This observer was analysed for the cases of state reconstruction, observer-based control and observer-based control in the presence of non-Hurwitz modes. For the first case, Linear Matrix Inequalities relaxations were proposed through the usage of the Reciprocal Projection Lemma and the Finsler's Lemma. Yet, a norm optimization of the output gain matrices was achieved through the usage of Linear Matrix Inequalities applied to the Frobenius norm of those matrices. All the study was done with applications to the control of DC-DC converters, immediate examples of the Switched Affine Systems theory, given their nature
Doutor
8
Viglus, Francisco José. "Projeto e desenvolvimento de um emulador de arranjo fotovoltaico utilizando um conversor CC-CC trifásico PWM." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1552.
Full textAbstract:
CAPESEste trabalho apresenta um estudo voltado ao projeto e desenvolvimento de um emulador de painéis fotovoltaicos. O emulador é composto por uma fonte de alimentação de 4 kW capaz de fornecer tensões e correntes cujo comportamento se assemelha ao comportamento de um arranjo de painéis fotovoltaicos. A estrutura de potência da fonte de alimentação é constituída por um conversor CC-CC Full-Bridge trifásico. Este conversor, isolado em alta frequência, garante menor volume e segurança para um equipamento de laboratório. Estima-se que este trabalho possa ser aplicado no teste de inversores fotovoltaicos com métodos de MPPT com respostas dinâmicas de até 300Hz. A estratégia de controle se baseia na solução numérica do modelo matemático de uma célula fotovoltaica de onde se extrai uma referência de corrente que, a partir de adequações, é imposta à carga ligada ao emulador. Desta forma, é apresentada uma metodologia de projeto da fonte de alimentação proposta. Por fim, são apresentados os resultados práticos que comprovam a funcionalidade do emulador.
This work presents a study, design, and development of a 4 kW photovoltaic array emulator. The emulator is composed of a power supply capable of delivering voltages and currents whose behavior resembles the behavior of a photovoltaic array. The structure of this power supply consists of a three-phase full-bridge DC-DC converter. This high frequency isolated converter provides a smaller volume and ensures safety for laboratory equipment. This work can be applied to test photovoltaic inverters with MPPT methods and dynamic responses up to 300Hz. The control strategy is based on the numerical solution of the mathematical model of a photovoltaic cell from which is extracted a reference current to the control of the emulator. The methodology applied to design the proposed power supply is also presented. Finally, the design, simulation, and practical results of the emulator are shown to prove its operation.
9
Dequigiovani, Tiago. "Conversor CC-CA utilizando célula ZVT." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/872.
Full textAbstract:
Este trabalho trata sobre a utilização de técnicas de comutação suave aplicadas `a conversores estáticos de potência. A técnica analisada em particular consiste em proporcionar comutação em zero de tensão aos interruptores controlados, sendo referenciada na literatura como Zero Voltage Switching (ZVS). Dentre as diversas topologias de circuitos que implementam a técnica ZVS, neste trabalho é utilizada uma célula de comutação Zero Voltage Transition (ZVT), no qual utiliza interruptores controlados e elementos em paralelo com o circuito principal. O foco do trabalho é a aplicação desta célula ZVT a um conversor CC-CA PWM monofásico com saída senoidal. Nesse sentido inicialmente é feita uma revisão das topologias básicas dos inversores, é das técnicas PWM utilizadas para obtenção de saída senoidal. São apresentados os circuitos ZVT convencional e aprimorado descritos na literatura, no qual o ZVT aprimorado é empregado ao conversor CC-CA ponte completa. São apresentadas as etapas de funcionamento e análise matemática. É descrita uma metodologia de projeto para a determinação dos componentes do circuito auxiliar, com base em restrições definidas para o correto funcionamento da célula e das características dos semicondutores utilizados como chave. Um protótipo do conversor é implementado em laboratório para a validação do projeto, verificação das formas de onda nos interruptores e análise do rendimento. Outros dois circuitos de auxílio à comutação são implementados para efeitos de comparação, sendo o circuito ZVT convencional e o dissipativo snubber de Undeland. Os resultados experimentais comprovam a obtenção da comutação suave nos interruptores e o conversor apresentou rendimento de no mínimo 1% superior ao ZVT convencional e 2% ao snubber de Undeland, valores estes para toda a faixa de carga.This paper discusses above the application of soft-switching techniques to static power conver-ters. The technique discussed in particular consists in provide zero voltage switching (ZVS) to controlled switches. Among the various circuit topologies to implement the ZVS technique, in this work is used a cell Zero-Voltage Transition (ZVT), in which uses controlled switches and elements in parallel with the main circuit. The main objective of the work is the application of this cell ZVT to a single-phase PWM inverter with sinusoidal output. In this sense initially is made a review of the basic topologies of inverters , and of the PWM techniques used to obtain sinusoidal output. Are presented the circuits ZVT conventional and improved described in the literature, in which the improved ZVT is employed on DC-AC full bridge converter. Steps of operation and mathematical analysis are presented. A design methodology is described for the determination of the components of the auxiliary circuit, based on constraints set for the correct functioning of the cell and of the characteristics of semiconductor. A prototype of the converter is implemented in the laboratory for the validation of the project, verification of waveforms the switches and analysis of efficiency. This converter is compared with other two circuits, ZVT conventional and the Undeland snubber. Experimental results show the achievement of soft switching the switches and the converter presenting an efficiency of at least 1% over for the ZVT conventional and 2% to the undeland snubber, these values for all load range.
10
Lima, Welton da Silva. "Estudo e modelagem de uma nova topologia de conversor Buck quadrÃtico CC-CC nÃo isolado." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16212.
Full textAbstract:
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoNeste trabalho à apresentado o estudo, modelagem e projeto de uma nova topologia de conversor CC-CC, o Conversor Buck QuadrÃtico CC-CC nÃo isolado (QBC). Inicialmente, foi realizada a anÃlise qualitativa e quantitativa da topologia proposta para operaÃÃo em modo de conduÃÃo contÃnua (MCC), verificando-se as etapas de operaÃÃo e obtendo-se as relaÃÃes de tensÃo e corrente para dimensionar os componentes de projeto do conversor, tambÃm foi realizada a modelagem do sistema atravÃs da representaÃÃo no espaÃo de estados. Em seguida, a fim de validar a topologia proposta, utilizou-se simulaÃÃo via PSpice. ApÃs essa etapa, iniciou-se a construÃÃo de um protÃtipo com 500 W de potÃncia total de saÃda, operando em 20 kHz. Os resultados experimentais obtidos confirmam que a topologia proposta pode ser utilizada em atividades prÃticas, como por exemplo, para o carregamento de baterias.
In this paper is presented the study, modeling and design of a new DC-DC converter topology, the Converter Quadratic Buck DC-DC non-isolated (QBC). Initially, was made the qualitative and quantitative analysis of the proposed topology of continuous conduction mode operation (MCC), the steps of operation and thus the relationship of voltage and current to size the components converter project, was also held the system modeling through representation on the State space. Then, in order to validate the proposed topology, was used simulation via PSpice. After this step, began the construction of a prototype with 500 W total power output, operating at 20 kHz. The experimental results obtained confirm that the proposed topology can be used in practical activities, for example, for battery charging.
Book chapters on the topic "Converters CC"
1
Chaitanya, Tumula V. K., Tho Le-Ngoc, and Erik G. Larsson. "Energy-Efficient Power Allocation for HARQ Systems." In Advances in Wireless Technologies and Telecommunication, 179–98. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8732-5.ch008.
Full textAbstract:
Reliability of data transmission is a fundamental problem in wireless communications. Fading in wireless channels causes the signal strength to vary at the receiver and this results in loss of data packets. To improve the reliability, automatic repeat request (ARQ) schemes were introduced. However these ARQ schemes suffer from a reduction in the throughput. To address the throughput reduction, conventional ARQ schemes were combined with forward error correction (FEC) schemes to develop hybrid-ARQ (HARQ) schemes. For improving the reliability of data transmission, HARQ schemes are included in the wireless standards like LTE, LTE-Advanced and WiMAX. Conventional HARQ systems use the same transmission power in different ARQ rounds. However this is not optimal in terms of minimizing the average energy spent for successful transmission of a data packet. In this book chapter, the recent research results related to HARQ systems are reviewed first. Next, optimal resource allocation in HARQ systems with a limit on the maximum number of allowed transmissions for a data packet is considered in the next part. Specifically, the problem of minimizing the rate-outage probability under a constraint on average energy consumption per data packet for both incremental redundancy (IR)-based and Chase combining (CC)-based HARQ systems is considered. Towards solving the optimization problems, the expressions for rate-outage probability of both IR-HARQ and CC-HARQ systems in i.i.d. Rayleigh fading channels is provided. Methods to solve the optimization problems using nonlinear optimization techniques are discussed. To reduce the complexity of finding a solution, the rate-outage probability expressions are approximated, using which, the non-convex optimization problems are converted into geometric programming problems (GPPs), for which the closed-form solutions are derived. Illustrative and analytical results show that the proposed power allocation provides significant gains in energy savings over the traditional equal power allocation transmission, and the closed-form GPP solution can provide a performance close to that of the exact method for smaller values of rate-outage probability.
2
Oriakhi, Christopher O. "Chemical Equilibrium." In Chemistry in Quantitative Language. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780195367997.003.0021.
Full textAbstract:
Many chemical reactions go to completion; i.e., all the reactants are converted to products. A good example is the reaction of calcium with cold water. . . Ca(s)+2 H2O(l) → Ca(OH)2(s)+ H2(g) . . . There is no evidence that the reverse reaction occurs. Such reactions are said to be irreversible. On the other hand, many reactions are reversible: the process can be made to go in the opposite direction. This means that both the reactants and products will be present at any given time. A reversible reaction is defined as one in which the products formed can react to give the original reactants. A double arrow is used to indicate that the reaction is reversible, as illustrated by the general equation:. . . aA+bB ⇌ cC +dD. . . At the start of the reaction, the reactants convert more quickly to products than products turn back to reactants because the reactants are present in much greater amount. Eventually the concentration of products is sufficient for the reverse reaction to become significant. The reaction is said to reach equilibrium when the net change in the products and reactants is zero, i.e., the rate of forward reaction equals the rate of reverse reaction. Chemical equilibria are dynamic equilibria because, although nothing appears to be happening, opposing reactions are occurring at the same rate. Figure 17-1 illustrates that for a reaction in chemical equilibrium, the rate of forward reaction equals the rate of reverse reaction. When a chemical reaction is at equilibrium, the concentrations of reactants and products are constant. The relationship between the concentrations of reactants and products is given by the equilibrium expression, also known as the law of mass action. For the general reaction:. . . aA+bB cC +dD. . . at a constant temperature, the equilibrium constant expression is written as: Kc = [C]c[D]d/[A]a[B]b where [A], [B], [C], and [D] are the molar concentrations or partial pressures of A,B,C, and D at equilibrium. The exponents a,b, c, and d in the equilibrium expression are the coefficients in the balanced equation; Kc is the equilibrium constant and is not given units. The subscript c shows that K is in terms of concentration. The numerical value for Kc is usually determined experimentally.
Conference papers on the topic "Converters CC"
1
Chao, Paul C. P., W. D. Chen, and R. H. Wu. "A Battery Charge Controller for a Flyback Converter With Digital Primary Side Regulation." In ASME 2013 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/isps2013-2879.
Full textAbstract:
The market of electronic products such as mobile phones and portable devices grows rapidly while the demand of lithium battery for fast charge, long duration, and long life cycle increases significantly as well. There are several charge methods for lithium battery, such as constant current (CC)/constant voltage (CV) charge [1], pulse charge [2] and reflex charge [3], etc. In general, a flyback converter has been widely adopted as the front-end converter of battery charger due to its low-cost, wide power range, and galvanic isolation between input and output stage. The battery charge controller with flyback converter has been developed in digital control with opto-coupler feedback [4]–[6]. The conventional flyback converter with CC or CV applications always requires two sensed ADC channels for regulating [7]–[9]. An improved control method is proposed in this study to achieve CC/CV by only one ADC channel. This study presents a battery charge mechanism with a flyback converter and associated trickle charge method for the temperature compensation. The PSR is adopted for switching the charge modes within trickle current (TC), constant current (CC) and constant voltage (CV). The TC charging method is used to avoid the rapid increase in the temperature of the battery which is based on the characteristics of the internal resistance of the battery [10]. The proposed system circuit contains two stages in topology. The first stage is a front-end flyback converter which operates in DC-DC discontinuous current mode (DCM) by using PSR to sense the output voltage from auxiliary winding. It is adopted to replace the opto-coupler for avoiding temperature limitation for operations and reducing cost. The software Powersim is used to simulate the proposed flyback converter and PSR method. The second stage is the digital feedback loop, which processes the controlled signal by a digital processor (DSP) TMS320F2812. The experimental results were compared with general CC/CV method. The results show favorable performance of the propose charging method.
2
Tsang, H. K. T., Y. C. Fong, Kin Lung Jerry Kan, S. Raghu Raman, and K. W. E. Cheng. "A Study of LLC Converter with Buck Converter for CC-CV Charging." In 2020 8th International Conference on Power Electronics Systems and Applications (PESA). IEEE, 2020. http://dx.doi.org/10.1109/pesa50370.2020.9343991.
Full text
3
Lucas, Ricardo, Robson M. Oliveira, Claudinor B. Nascimento, and Mauricio S. Kaster. "Performance analysis of an adaptive Gaussian nonlinear PID control applied to a step-down CC-CC converter." In 2015 IEEE 24th International Symposium on Industrial Electronics (ISIE). IEEE, 2015. http://dx.doi.org/10.1109/isie.2015.7281612.
Full text
4
C. Salvador, Thaís, Tatiane M. Oliveira, and Fernando L. Tofoli. "Conversor CC-CC SEPIC Não Isolado de Alto Ganho Baseado na Célula de Comutação de Três Estados Empregando Células Multiplicadoras de Tensão." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1093.
Full textAbstract:
Conversores CC-CC não isolados com ampla taxa de conversão têm sido utilizados em uma vasta gama de aplicações modernas, incluindo sistemas de conversão de energias renováveis, sistemas de alimentação ininterrupta (uninterruptible power supplies – UPSs), entre outras. No entanto, muitas topologias são viáveis apenas para aplicações de baixa potência, sendo que outros aspectos além da taxa de conversão também são importantes como, por exemplo, número de componentes, esforços nos semicondutores e rendimento. Nesse contexto, este trabalho apresenta um conversor SEPIC (single-ended primary inductance converter) baseado na célula de comutação de três estados (three-state switching cell – 3SSC) e em células multiplicadoras de tensão (voltage multiplier cells – VMCs), o qual é capaz defornecer elevado ganho de tensão e esforços reduzidos nos semicondutores. O princípio de operação, a análise qualitativa e a análise quantitativa são descritos em detalhes. Além disso, resultados de simulação são apresentados para validar as considerações teóricas.
5
He, Luyang, Changyuan Chang, Chang Chen, and Xiong Han. "A Novel CC/CV AC-DC Converter Without Auxiliary Winding." In 2020 IEEE International Conference on Artificial Intelligence and Information Systems (ICAIIS). IEEE, 2020. http://dx.doi.org/10.1109/icaiis49377.2020.9194853.
Full text
6
Jakkaraju, Madhuri, and Vasudha Patri. "S. I. Engine Pollution Control Using Low-Cost Palletized Catalytic Converter." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58248.
Full textAbstract:
I. C. Engines consume large amounts of fossil fuel emitting harmful pollutants like carbon monoxide (CO), unburnt hydrocarbons (UBHC), and oxides of nitrogen (NOx). By using a catalytic converter (CC), the carbon monoxide, hydrocarbon emissions can be transformed into less harmful carbon dioxide (CO2) & water vapor (H2O). Currently available CC’s are using costly noble metals like platinum (pt), palladium (pd), rhodium (rh) etc., hence making them expensive. This paper deals with the use of low-cost palletized silver coated alumina as the catalyst element in a CC. In this study, alumina and silver were used in the ratio of 10:1. All tests have been conducted on a stationary S.I. Engine at a constant speed of 1500 r.p.m with and without CC. Also, the performance of the palletized CC in combination with promoters like Bismuth, Cerium and Lanthanum was tested which have shown better results than silver alone as the coating element. It has been experimentally determined that the CO emissions have dropped from 7.25 (% vol) to 3.03(% vol) and the HC values have reduced from 350 ppm to 190 ppm.
7
Suryoatmojo, H. "Design Li-Po Battery Charger with Buck Converter under Partially CC-CV Method." In 2020 International Seminar on Intelligent Technology and Its Applications (ISITIA). IEEE, 2020. http://dx.doi.org/10.1109/isitia49792.2020.9163754.
Full text
8
Johnson, Michael V., Samuel Duncan, and Steven S. McConnell. "Startup and Idle Emissions Analysis of a 2009 VW Jetta Using PEMS SemtechD." In ASME 2012 Internal Combustion Engine Division Spring Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ices2012-81170.
Full textAbstract:
A 2009 Volkswagen Jetta was tested using a Portable Emissions Measurement System (PEMS) SemtechD emissions analyzer to determine when the emissions and fuel consumption will be the smallest in regards to startup vs. idle emissions. An idle time equivalent was calculated to determine when idle emissions became equal to startup emissions at four different ambient temperatures for a cold start. The mass of Total Hydrocarbons (THC) emitted limited the idle time equivalent to less than the startup time for all ambient temperatures. The temperature of the Catalytic Converter (CC) was monitored to determine how quickly the car cools down and therefore, how beneficial it is to turn the car off after a certain time period. For the temperature range tested, it was more beneficial for reduced emissions to turn off the car compared to idling by a factor of at least four. The data suggests a trend that idling would never be the best option; however, more testing needs to be done with a greater range of CC cool down temperatures to confirm this initial assessment.
9
Rachid, Aziz, Hassan El Fadil, and Fouad Giri. "Dual stage CC-CV charge method for controlling DC-DC power converter in BEV charger." In 2018 19th IEEE Mediterranean Electrotechnical Conference (MELECON). IEEE, 2018. http://dx.doi.org/10.1109/melcon.2018.8379071.
Full text
10
Park, Ki-Hyeon, Yeong-Jun Choi, See-Young Choi, and Rae-Young Kim. "Design consideration of CC-CV controller of LLC resonant converter for Li-ion battery charger." In 2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC). IEEE, 2015. http://dx.doi.org/10.1109/ifeec.2015.7361597.
Full text