电子电路基础课件CH(I)

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1、Ch2BasicAnalysisMethodstoCircuits2.1EquivalentCircuits2.2TheSuperpositionPrinciple2.3Thevenin’sandNorton’stheoremsReadings:Gao-Ch2;Hayt-Ch3,4CircuitsandAnalogElectronicsCh2BasicAnalysisMethodstoCircuits2.1EquivalentCircuitsKeyWords:EquivalentCircuitsNetworkEquivalentResistance,Equiv

2、alentIndependentSources2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsEquivalentCircuitsNetworkооооTwo-terminalCircuitsNetworkооbооN1Ia+-VооN2Iab+-Vооооabcd651552.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsHowdowefindI1andI2?R1R2V+-I1I2II1+I2=IEquivalentResistanc

3、e2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsEquivalentResistancei(t)+-v(t)i(t)+-v(t)ReqReqisequivalenttotheresistornetworkontheleftinthesensethattheyhavethesamei-vcharacteristics.2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsEquivalentResistanceSeriesandparallelRe

4、sistanceMethod1Method2IVRRabo==abVIsource-freesourceVocMethod3ISCsource(source-free)2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsEquivalentResistanceP2.1Method1Method2VR1R2R3abIVSR1R2R3ab+-HowdowefindRab?ISC=VS/R3Method32.1EquivalentCircuitsCh2BasicAnalysisMethods

5、toCircuitsSourceTransformationIdeally:AnidealcurrentsourcehasthevoltagenecessarytoprovideitsratedcurrentAnidealvoltagesourcesuppliesthecurrentnecessarytoprovideitsratedvoltagePractice:ArealvoltagesourcecannotsupplyarbitrarilylargeamountsofcurrentArealcurrentsourcecannothaveanarbitra

6、rilylargeterminalvoltage2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsSourceTransformationVs+-RsIsRsNote:Consistencybetweenthecurrentsourceref.directionandthevoltageSourceref.terminals.2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsHowdowefindI1andI2?EquivalentSourceI

7、s2VR1R2+-I1I2Is1I1+I2=Is1-Is2Ieq2.1EquivalentCircuitsCh2BasicAnalysisMethodstoCircuitsEquivalentSourceSeriesVoltageSource+++---VS1VS2VSn+-VSparallelCurrentSourceIS1IS2ISnISIRS=RS1//RS2//…//RSnCh2BasicAnalysisMethodstoCircuits2.2TheSuperpositionPrincipleKeyWords:LinearitySupe

8、rpositionCh2BasicAn