Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems
Autor(a) principal: | |
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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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Biblioteca Digital de Teses e Dissertações da UFC |
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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 |
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http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Cearà |
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 |
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Universidade Federal do Cearà |
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reponame:Biblioteca Digital de Teses e Dissertações da UFC instname:Universidade Federal do Ceará instacron:UFC |
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Biblioteca Digital de Teses e Dissertações da UFC |
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Biblioteca Digital de Teses e Dissertações da UFC |
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Universidade Federal do Ceará |
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UFC |
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UFC |
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mail@mail.com |
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