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Advisor(s)
Abstract(s)
Nesta dissertaĆ§Ć£o propƵe-se o estudo e implementaĆ§Ć£o prĆ”tica de um circuito gerador de onda de choque, com a capacidade de gerar as formas de onda definidas pela norma internacional de compatibilidade eletromagnĆ©tica IEC 61000-4-5 [1]. Estes geradores sĆ£o utilizados por laboratĆ³rios em contexto de acreditaĆ§Ć£o de produtos eletrĆ³nicos e elĆ©tricos quanto Ć sua imunidade a sobretensƵes transitĆ³rias.
Este trabalho inicia-se com o estudo do fenĆ³meno fĆsico de base que um gerador de onda de choque procura reproduzir, isto Ć©, o estudo laboratorial das descargas atmosfĆ©ricas, com ĆŖnfase nos diferentes modelos de ondas utilizados para descrever tal fenĆ³meno.
Seguidamente realiza-se o estudo teĆ³rico e anĆ”lise matemĆ”tica do circuito definido pela norma IEC 61000-4-5, obtendo-se assim as equaƧƵes que regem os vĆ”rios modos de funcionamento do circuito. A partir destas equaƧƵes foi entĆ£o possĆvel obter um modelo matemĆ”tico para simulaĆ§Ć£o em Matlab, com o objetivo de dimensionar o circuito. De igual modo, foi implementada a simulaĆ§Ć£o do circuito no programa LTspice, sendo que ambos permitem prever o comportamento do circuito para vĆ”rias condiƧƵes de funcionamento. Por fim, realizou-se uma implementaĆ§Ć£o laboratorial do gerador de onda de choque, escolhendo para isso o elemento semicondutor de potĆŖncia que respeitasse todos os requisitos de desempenho do gerador, o que resultou numa sĆ©rie de resultados experimentais e conhecimento acerca da implementaĆ§Ć£o deste tipo de geradores, bem como na comparaĆ§Ć£o destes resultados experimentais com os de simulaĆ§Ć£o.
This dissertation proposes the study of a surge generation circuit, capable of generating waveforms defined by the international standard of electromagnetic compatibility IEC 61000-4-5 [1] and its implementation. Certification Laboratories used these generators to test and deem electronic and electrical product immune to transient overvoltage. The first step for this project is to study the basic physical phenomenon that a surge generator seeks reproduces, mainly, the laboratory study of atmospheric discharges, emphasising the different wave models used to describe this phenomenon. The theoretical study and mathematical analysis of the circuit defined by the standard IEC 61000-4-5 followed, these provided us with the equations that mimic the behaviour of the different operating modes. These equations provided us with the mathematical model of the circuit, allowing us to better size of the components of the circuit. This, in return, emerged to the simulation in LTspice. The combination of both methods covers a wide spectrum of operating conditions. Lastly, the laboratorial implementation of the surge generator was carried out, choosing for this the semiconductor power element that filled all the requirements of the generator. The experiment itself provided a wide range of results and enriched us with āon the jobā knowledge concerning the implementation of this type of generators. Furthermore it allowed us to establish a relation between the experimental and theoretical results.
This dissertation proposes the study of a surge generation circuit, capable of generating waveforms defined by the international standard of electromagnetic compatibility IEC 61000-4-5 [1] and its implementation. Certification Laboratories used these generators to test and deem electronic and electrical product immune to transient overvoltage. The first step for this project is to study the basic physical phenomenon that a surge generator seeks reproduces, mainly, the laboratory study of atmospheric discharges, emphasising the different wave models used to describe this phenomenon. The theoretical study and mathematical analysis of the circuit defined by the standard IEC 61000-4-5 followed, these provided us with the equations that mimic the behaviour of the different operating modes. These equations provided us with the mathematical model of the circuit, allowing us to better size of the components of the circuit. This, in return, emerged to the simulation in LTspice. The combination of both methods covers a wide spectrum of operating conditions. Lastly, the laboratorial implementation of the surge generator was carried out, choosing for this the semiconductor power element that filled all the requirements of the generator. The experiment itself provided a wide range of results and enriched us with āon the jobā knowledge concerning the implementation of this type of generators. Furthermore it allowed us to establish a relation between the experimental and theoretical results.
Description
DissertaĆ§Ć£o para a obtenĆ§Ć£o do grau de mestre em Engenharia EletrotĆ©cnica ā Ramo de AutomaĆ§Ć£o e EletrĆ³nica Industrial
Keywords
Compatibilidade eletromagnƩtica Electromagnetic compatibility Gerador de onda de choque Surge generator IEC 61000-4-5 Matlab LTspice
Citation
AGUIAM, Bruno Miguel Nobre Carrilho de - Estudo e implementaĆ§Ć£o de um gerador de onda choque (surge generator) segundo a norma IEC 61000-4-5. Lisboa: Instituto Superior de Engenharia de Lisboa, 2017. DissertaĆ§Ć£o de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa