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aulas 6 e 7 - anlise nodal

aulas 6 e 7 - anlise nodal - Escola de Engenharia Eltrica e...

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Escola de Engenharia Elétrica e de Computação Universidade Federal de Goiás 1 - Exercícios sobre circuitos resistivos - Método de Análise de Circuitos – Método das Tensões de Nó Aulas 6 e 7 - 26, 09/09
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Métodos de Análise de Circuitos Resistivos TÉCNICAS DE ANÁLISE DE CIRCUITOS RESISTIVOS TÉCNICAS PARA A DETERMINAÇÃO DAS TENSÕES E CORRENTES NO CIRCUITO - MÉTODO DAS TENSÕES DE NÓ 2 - MÉTODO DAS CORRENTES DE MALHA – Método das Tensões de Nó (Análise Nodal) AS VARIÁVEIS UTILIZADAS PARA DESCREVER O CIRCUITO SÃO AS TENSÕES NODAIS - A TENSÃO DE CADA NÓ DO CIRCUITO RELATIVAMENTE A UM NÓ DE REFERÊNCIA
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Métodos de Análise de Circuitos Resistivos Sabendo-se as tensões nos nós de um circuito calculam-se as correntes recorrendo à Lei de Ohm 3 R v v i n m - =
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Métodos de Análise de Circuitos Resistivos • Para análise de tensão em nós é utilizada a Lei de Kirchhoff das correntes • Determinam-se as diferenças de potencial entre os nós Considere o circuito 4
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Métodos de Análise de Circuitos Resistivos Simplificando - Marque os nós no circuito - Marque o nó de referência (nó cuja tensão vale zero) a b c 5 e d
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Métodos de Análise de Circuitos Resistivos - número de equações simultâneas = n - 1 (equivale as tensões desconhecidas) Tensão de nó – diferença de potencial entre um nó e o nó de referência va vb vc 6 ve vd
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Métodos de Análise de Circuitos Resistivos - marque as correntes do circuito va vb vc i1 i2 i3 i5 7 ve vd i4
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Métodos de Análise de Circuitos Resistivos Aplique LKC ao circuito va vb vc i1 i2 i3 i5 8 ve vd i4 Por Restrição va – ve = vf Nó b i1 = i2 + i3 Nó c i3 + if = i5 Nó d i4 + i5 = if
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Métodos de Análise de Circuitos Resistivos va vb vc i1 i2 i3 i5 9 ve vd i4 Por Restrição Nó b f
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