电路基础英文版CHAPTER ppt课件.ppt

《电路基础英文版CHAPTER ppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chapter3MethodsofAnalysis要求深刻理解与熟练掌握的重点内容有:节点电压法和网孔电流法。要求一般理解与掌握的内容有:支路电流法与回路电流法。难点：独立方程数、回路电流法。•3-1Introduction•3-2NodalAnalysis•3-3NodalAnalysiswithVoltageSources•3-4MeshAnalysis•3-5MeshAnalysiswithcurrentSources•3-6NodalandMeshAnalysesbyInspection•3-7NodalVer

2、susMeshAnalysis•3-10Summary3.1Introductionsimultaneousequations联立方程determinant行列式quotient商，比值，系数simulation仿真transistor晶体管datumnode基准结点planar平面的nonplanarwork非平面网络softwarepackage软件包achassisground框架接地线substitutionmethod替代法eliminationmethod消去法NETWORKTOPOLOGYAgivencircu

3、itanditslineargraph(orsimplyagraph)Node：Apointatwhichtwoormoreelementshaveacommonconnection.Branch：Asinglepath,containingonesimpleelement,whichconnectsonenodetoanyothernode.连通图有向拓扑图Tree（树）：Asetofbrancheswhichdoesnotcontainanyloopsandconnectseverynodetoeveryothernod

4、es.Cotree（余树）：Afteratreehasbeenspecified,thosebranchesthatnotpartofthetreeformthecotree.Link（连支）：Anybranchbelongingtothecotree.CheckYourUnderstanding：一个有n个节点、b条支路的连通图，连支数l为？l=b－(n－1)3-2结点电压法Node-VoltageAnalysis/NodalAnalysis一、Steps：1.Selectanodeasthereferencenode.

5、AssignvoltagesV1,V2,…,Vn-1totheremainingn-1nodes.2.ApplyKCLtoeachofthen-1nonreferencenodes.UseOhm’slawtoexpressthebranchcurrentsintermsofnodevoltages.3.Solvetheresultingsimultaneousequationstoobtaintheunknownnodevoltages.Node1：-I1-IS2-I3+IS4+I5+I6=0I1=G1(U②-U①+US1)

6、，I3=G3(U③-U①)，I5=G5(U①-U⑤)，I6=G6(U①-U⑤+US6)(G1+G3+G5+G6)U①-G1U②-G3U③-(G5+G6)U⑤=G1US1-G6US6+IS2-IS4G11U①+G12U②+G13U③+G15U⑤=G11U①+G12U②+G13U③+G15U⑤=Gij（i=j）：自导，Sumoftheconductancesconnectedtonodei.Gij（ij）：互导，Negativeofthesumoftheconductancesdirectlyconnectingnodesia

7、ndj.（TurnOFFallsources.）：Sumofallsourcesdirectlyconnectedtonode1,withcurrentsenteringthenodetreatedaspositive.(G1+G3+G4+G5+G6)U①-G1U②-G3U③-G4U④-(G5+G6)U⑤=G1US1-G6US6+IS2-IS4+G4US4(G1+G3+G5+G6)U①-G1U②-G3U③-(G5+G6)U⑤=G1US1-G6US6+IS2-IS4(G1+G3+G4+G5+G6)U①-G1U②-G3U③-G4

8、U④-(G5+G6)U⑤=G1US1-G6US6+IS2-IS4+G4US4TurnOFFallsources!!!电源置零Example：R1=R1’=0.5，R3=R4=R5=R6=1，US1=1V，US3=3V，IS2=2A，IS6=6A.Calculatethecurrents