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Previous issue date: 2015-01-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This work presents the simultaneous conduction mode (SCM), which is applied to the operation of the Zeta converter. This mode has the ability to implement an ideal power factor corrector (PFC) employing only one feedback control loop. In SCM, the current in the main switch and in the diode flows simultaneously within one of the operation stages. In SCM, the power converter presents characteristics of both conduction modes: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In SCM, the currents in the inductors of the power converter are never nullified, which is a typical behavior of the CCM. Nevertheless, the SCM does that while obtaining an ideal PFC with just one control loop. The SCM maintains its features, regardless of its control variable being the output current or the output voltage of the power converter. The solely application of a fixed duty cycle controller is enough to attain all these advantages, which is usually a feature of the DCM for PFCs of the flyback family. In order to validate the proposed technique, a complete study of the Zeta converter working in this new operation mode was performed.This study has included a qualitative and a quantitative power converter analysis. These analyses resulted in the development of a design methodology for the Zeta power converter working as a PFC in the SCM. In order to validate the present study, a prototype of the Zeta PFC for operation in the SCM was designed and built. This prototype was developed, as a case of study, to drive a power LED lamp (180?W). Thus, it was obtained the desired experimental confirmation for the research. The main advantage of the SCM, in comparison to the CCM, lies in its ability to maintain the input current of the PFC sinusoidal and in phase with the input voltage, which is imposed by the mains through the use of just a single PWM controller with fixed duty cycle. These results have, also, shown that the current peaks in the main semiconductors of the power converter are lower than their respective values in the DCM. However, this new operation mode results in the increase of the voltages on the main switch and diode in relation to the conventional power converter operation. The research of the application of the proposed method to other power converters is suggested to further works. / Este trabalho prop?e a opera??o do conversor Zeta no modo de condu??o simult?nea (MCS), cujo interesse reside na capacidade de implementa??o de um pr?-regulador do fator de pot?ncia (PFP) ideal empregando apenas um la?o de realimenta??o. Quando o conversor trabalha no MCS, a chave principal e o diodo conduzem simultaneamente em um de seus est?gios de opera??o. Neste modo de condu??o, o conversor est?tico apresenta caracter?sticas de ambos os modos de condu??o conhecidos at? agora: o modo de condu??o cont?nua (MCC) e o modo de condu??o descont?nua (MCD). A opera??o no MCS resulta em um conversor est?tico operando como se estivesse no MCC, uma vez que a corrente nos indutores nunca se anula. Embora mantenha o conversor est?tico trabalhando com esta caracter?stica do MCC, o MCS permite a obten??o de um comportamento quase ideal do PFP, utilizando apenas um ?nico controlador, seja ele de corrente ou de tens?o, o qual mant?m a raz?o c?clica do conversor constante, assim como usualmente ocorre com os PFPs da fam?lia redutor-elevador quando operam no MCD.Visando validar esta t?cnica, foi realizado um estudo do conversor operando desta forma que incluiu o desenvolvimento das an?lises qualitativa e quantitativa do conversor, as quais culminaram na elabora??o de uma metodologia de projeto. Assim, realizou-se o projeto de um PFP, baseado no conversor Zeta, para energizar uma lumin?ria LED de 180 W, operando no MCS, como estudo de caso. A lumin?ria utilizada ? o modelo High Power LED Baylight da empresa Luckysunny?. Os resultados obtidos experimentalmente validaram a estrat?gia proposta, uma vez que, com a opera??o do conversor Zeta no MCS reduz-se a ondula??o (ripple) da corrente nos semicondutores em rela??o ? opera??o no MCD. A principal vantagem da opera??o no MCS reside no fato deste manter a corrente de entrada do PFP senoidal em fase com a tens?o imposta pela rede el?trica com apenas uma malha de controle da vari?vel de sa?da de interesse seja ela tens?o ou corrente como no estudo de caso em quest?o. Isto reduz o custo e a complexidade do controlador do conversor. Entretanto, esta estrat?gia apresenta sobretens?o na chave principal e no diodo como principal desvantagem. Sugere-se a investiga??o da aplica??o da metodologia de projeto proposta a outros conversores.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6142 |
| Date | 07 January 2015 |
| Creators | Pedrollo, Guilherme Rodrigues |
| Contributors | Reis, Fernando Soares dos |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia El?trica, PUCRS, Brasil, Faculdade de Engenharia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 207662918905964549, 600, 600, 600, 600, -655770572761439785, 4518971056484826825, 2075167498588264571 |
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