Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems

Detalhes bibliográficos
Autor(a) principal: Antonia Fernandes da Rocha
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889
Resumo: With global need to reduce energy consumption, the search for more efficient technologies has become the focus of many studies. Among these technologies, it can mention the photovoltaic solar energy and LEDs, which have shown an expansion in recent decades. Photovoltaic generation is shown as an attractive energy source because it is renewable and its raw material is practically inexhaustible. While LEDs have a promising advance in lighting and is used in several applications. To integrate these technologies, this paper proposes the study of a DC-DC step-up switched-capacitor (SC) converter for LEDs applied to photovoltaic stand-alone systems. The proposed circuit differs from other topologies SC to insert an inductor in series with the input source, which can operate in discontinuous conduction mode (DCM), reducing losses switching, or continuous conduction mode (CCM), allowing the reduction of conduction losses in the circuit. The converter is driven by the frequency modulation, which is obtained as a function of input voltage. For this reason, the current in the LEDs can be stabilized without the need for sensor or feedback. The prototype developed in the laboratory was designed for a lamp of 54 W and operating at high frequency (up to 165 kHz), allowing the reduction of the circuit volume. Experimental results of the circuit in DCM and CCM show that the converter has a high yield, validating the proposal.
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spelling info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisStudy of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systemsEstudo de um Conversor CC-CC Elevador Com Capacitor Comutado Para LEDs Aplicado à Sistemas Fotovoltaicos2015-10-22Edilson Mineiro Sà JÃnior50081241372http://lattes.cnpq.br/4828845714096699Carlos Elmano de Alencar e Silva64232395334http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4775243E804243909300http://lattes.cnpq.br/8395151142681846Antonia Fernandes da RochaUniversidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia ElÃtrica e da ComputaÃÃo (Campus da UFC em Sobral-CE)UFCBRSistemas Fotovoltaicos, Sistemas autÃnomos de IluminaÃÃo, LEDs, Conversor CC-CC, Conversor com Capacitor Comutado.PV systems, Lighting autonomous systems, LEDs, DC-DC converter, Switched capacitor converter.SISTEMAS ELETRICOS DE POTENCIAWith global need to reduce energy consumption, the search for more efficient technologies has become the focus of many studies. Among these technologies, it can mention the photovoltaic solar energy and LEDs, which have shown an expansion in recent decades. Photovoltaic generation is shown as an attractive energy source because it is renewable and its raw material is practically inexhaustible. While LEDs have a promising advance in lighting and is used in several applications. To integrate these technologies, this paper proposes the study of a DC-DC step-up switched-capacitor (SC) converter for LEDs applied to photovoltaic stand-alone systems. The proposed circuit differs from other topologies SC to insert an inductor in series with the input source, which can operate in discontinuous conduction mode (DCM), reducing losses switching, or continuous conduction mode (CCM), allowing the reduction of conduction losses in the circuit. The converter is driven by the frequency modulation, which is obtained as a function of input voltage. For this reason, the current in the LEDs can be stabilized without the need for sensor or feedback. The prototype developed in the laboratory was designed for a lamp of 54 W and operating at high frequency (up to 165 kHz), allowing the reduction of the circuit volume. Experimental results of the circuit in DCM and CCM show that the converter has a high yield, validating the proposal.Tendo em vista a tendÃncia da reduÃÃo do consumo de energia no mundo, a busca por tecnologias mais eficientes tem se tornado o foco de muitos estudos. Dentre estas tecnologias, pode-se citar a energia solar fotovoltaica e os LEDs, que vem apresentando uma expansÃo nas ultimas dÃcadas. A geraÃÃo fotovoltaica se mostra como uma atrativa fonte de energia, por ser renovÃvel e sua matÃria-prima ser praticamente inesgotÃvel. Enquanto os LEDs apresentam um avanÃo promissor na iluminaÃÃo, sendo utilizado nas mais diversas aplicaÃÃes. Visando a integraÃÃo destas tecnologias, este trabalho propÃe o estudo de um conversor CC-CC elevador com capacitor comutado (Switched Capacitor - SC) para LEDs, aplicado a sistemas fotovoltaicos autÃnomos. O circuito proposto se difere de outras topologias SC por inserir um indutor em sÃrie com a fonte de entrada, o qual pode operar no modo de conduÃÃo descontÃnua (MCD), reduzindo as perdas por comutaÃÃo, ou no modo de conduÃÃo contÃnua (MCC), possibilitando a reduÃÃo das perdas por conduÃÃo do circuito. O conversor à acionado atravÃs da modulaÃÃo por frequÃncia, a qual à obtida em funÃÃo da tensÃo de entrada. Por este motivo, a corrente nos LEDs pode ser estabilizada sem a necessidade de sensores ou de realimentaÃÃo. O protÃtipo desenvolvido em laboratÃrio foi projetado para uma luminÃria de 54 W e operando em alta frequÃncia (atà 165 kHz), possibilitando a reduÃÃo do volume do circuito. Os resultados experimentais obtidos do circuito MCD e MCC sÃo analisados e validam a proposta, mostrando que o conversor apresenta rendimento elevadoFundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgicohttp://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:31:25Zmail@mail.com -
dc.title.en.fl_str_mv Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
dc.title.alternative.pt.fl_str_mv Estudo de um Conversor CC-CC Elevador Com Capacitor Comutado Para LEDs Aplicado à Sistemas Fotovoltaicos
title Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
spellingShingle Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
Antonia Fernandes da Rocha
Sistemas Fotovoltaicos, Sistemas autÃnomos de IluminaÃÃo, LEDs, Conversor CC-CC, Conversor com Capacitor Comutado.
PV systems, Lighting autonomous systems, LEDs, DC-DC converter, Switched capacitor converter.
SISTEMAS ELETRICOS DE POTENCIA
title_short Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
title_full Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
title_fullStr Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
title_full_unstemmed Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
title_sort Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
author Antonia Fernandes da Rocha
author_facet Antonia Fernandes da Rocha
author_role author
dc.contributor.advisor1.fl_str_mv Edilson Mineiro SÃ JÃnior
dc.contributor.advisor1ID.fl_str_mv 50081241372
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/4828845714096699
dc.contributor.advisor-co1.fl_str_mv Carlos Elmano de Alencar e Silva
dc.contributor.advisor-co1ID.fl_str_mv 64232395334
dc.contributor.advisor-co1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4775243E8
dc.contributor.authorID.fl_str_mv 04243909300
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/8395151142681846
dc.contributor.author.fl_str_mv Antonia Fernandes da Rocha
contributor_str_mv Edilson Mineiro SÃ JÃnior
Carlos Elmano de Alencar e Silva
dc.subject.por.fl_str_mv Sistemas Fotovoltaicos, Sistemas autÃnomos de IluminaÃÃo, LEDs, Conversor CC-CC, Conversor com Capacitor Comutado.
topic Sistemas Fotovoltaicos, Sistemas autÃnomos de IluminaÃÃo, LEDs, Conversor CC-CC, Conversor com Capacitor Comutado.
PV systems, Lighting autonomous systems, LEDs, DC-DC converter, Switched capacitor converter.
SISTEMAS ELETRICOS DE POTENCIA
dc.subject.eng.fl_str_mv PV systems, Lighting autonomous systems, LEDs, DC-DC converter, Switched capacitor converter.
dc.subject.cnpq.fl_str_mv SISTEMAS ELETRICOS DE POTENCIA
dc.description.sponsorship.fl_txt_mv FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
dc.description.abstract.por.fl_txt_mv With global need to reduce energy consumption, the search for more efficient technologies has become the focus of many studies. Among these technologies, it can mention the photovoltaic solar energy and LEDs, which have shown an expansion in recent decades. Photovoltaic generation is shown as an attractive energy source because it is renewable and its raw material is practically inexhaustible. While LEDs have a promising advance in lighting and is used in several applications. To integrate these technologies, this paper proposes the study of a DC-DC step-up switched-capacitor (SC) converter for LEDs applied to photovoltaic stand-alone systems. The proposed circuit differs from other topologies SC to insert an inductor in series with the input source, which can operate in discontinuous conduction mode (DCM), reducing losses switching, or continuous conduction mode (CCM), allowing the reduction of conduction losses in the circuit. The converter is driven by the frequency modulation, which is obtained as a function of input voltage. For this reason, the current in the LEDs can be stabilized without the need for sensor or feedback. The prototype developed in the laboratory was designed for a lamp of 54 W and operating at high frequency (up to 165 kHz), allowing the reduction of the circuit volume. Experimental results of the circuit in DCM and CCM show that the converter has a high yield, validating the proposal.
Tendo em vista a tendÃncia da reduÃÃo do consumo de energia no mundo, a busca por tecnologias mais eficientes tem se tornado o foco de muitos estudos. Dentre estas tecnologias, pode-se citar a energia solar fotovoltaica e os LEDs, que vem apresentando uma expansÃo nas ultimas dÃcadas. A geraÃÃo fotovoltaica se mostra como uma atrativa fonte de energia, por ser renovÃvel e sua matÃria-prima ser praticamente inesgotÃvel. Enquanto os LEDs apresentam um avanÃo promissor na iluminaÃÃo, sendo utilizado nas mais diversas aplicaÃÃes. Visando a integraÃÃo destas tecnologias, este trabalho propÃe o estudo de um conversor CC-CC elevador com capacitor comutado (Switched Capacitor - SC) para LEDs, aplicado a sistemas fotovoltaicos autÃnomos. O circuito proposto se difere de outras topologias SC por inserir um indutor em sÃrie com a fonte de entrada, o qual pode operar no modo de conduÃÃo descontÃnua (MCD), reduzindo as perdas por comutaÃÃo, ou no modo de conduÃÃo contÃnua (MCC), possibilitando a reduÃÃo das perdas por conduÃÃo do circuito. O conversor à acionado atravÃs da modulaÃÃo por frequÃncia, a qual à obtida em funÃÃo da tensÃo de entrada. Por este motivo, a corrente nos LEDs pode ser estabilizada sem a necessidade de sensores ou de realimentaÃÃo. O protÃtipo desenvolvido em laboratÃrio foi projetado para uma luminÃria de 54 W e operando em alta frequÃncia (atà 165 kHz), possibilitando a reduÃÃo do volume do circuito. Os resultados experimentais obtidos do circuito MCD e MCC sÃo analisados e validam a proposta, mostrando que o conversor apresenta rendimento elevado
description With global need to reduce energy consumption, the search for more efficient technologies has become the focus of many studies. Among these technologies, it can mention the photovoltaic solar energy and LEDs, which have shown an expansion in recent decades. Photovoltaic generation is shown as an attractive energy source because it is renewable and its raw material is practically inexhaustible. While LEDs have a promising advance in lighting and is used in several applications. To integrate these technologies, this paper proposes the study of a DC-DC step-up switched-capacitor (SC) converter for LEDs applied to photovoltaic stand-alone systems. The proposed circuit differs from other topologies SC to insert an inductor in series with the input source, which can operate in discontinuous conduction mode (DCM), reducing losses switching, or continuous conduction mode (CCM), allowing the reduction of conduction losses in the circuit. The converter is driven by the frequency modulation, which is obtained as a function of input voltage. For this reason, the current in the LEDs can be stabilized without the need for sensor or feedback. The prototype developed in the laboratory was designed for a lamp of 54 W and operating at high frequency (up to 165 kHz), allowing the reduction of the circuit volume. Experimental results of the circuit in DCM and CCM show that the converter has a high yield, validating the proposal.
publishDate 2015
dc.date.issued.fl_str_mv 2015-10-22
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
status_str publishedVersion
format masterThesis
dc.identifier.uri.fl_str_mv http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889
url http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.publisher.program.fl_str_mv Programa de PÃs-GraduaÃÃo em Engenharia ElÃtrica e da ComputaÃÃo (Campus da UFC em Sobral-CE)
dc.publisher.initials.fl_str_mv UFC
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFC
instname:Universidade Federal do Ceará
instacron:UFC
reponame_str Biblioteca Digital de Teses e Dissertações da UFC
collection Biblioteca Digital de Teses e Dissertações da UFC
instname_str Universidade Federal do Ceará
instacron_str UFC
institution UFC
repository.name.fl_str_mv -
repository.mail.fl_str_mv mail@mail.com
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