电子行业企业管理 电路分析与电子线路综合训练题

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1、电子行业企业管理 电路分析与电 子线路综合训练题 电子行业企业管理 电路分析与电 子线路综合训练题 2018 年电路分析与电子线路综合训练题2018 年电路分析与电子线路综合训练题 注意 ： 2018 年电路分析与电子线路综合训练组队共同讨论完成综合 训练题目 3-4 题，以书面形式撰写报告，需要详细的讨论过程和仿真的 结果。 请同学们自学 “数值分析软件 （如 MATLAB 等） 及电路仿真软件 （如 Multisim 或 Pspice 等）”。提交书面报告时间：6 月 20 日前。 注意 ： 2018 年电路分析与电子线路综合训练组队共同讨论完成综合 训练题目 3-4 题，以书面形式撰写报

2、告，需要详细的讨论过程和仿真的 结果。 请同学们自学 “数值分析软件 （如 MATLAB 等） 及电路仿真软件 （如 Multisim 或 Pspice 等）”。提交书面报告时间：6 月 20 日前。 Project1Project1 PowerSuppliesPowerSupplies Objective:Objective:Thisprojectwillshowsomeofthebasicprinciplesofpowersuppliesu singfullwaverectifier,Zenerdiode,andfixed-voltageregulatorcircuits. ponents

3、:ponents:BridgeRectifier(50PIV,1A),Zenerdiode(10Vat500mW),7805regulato r Introduction:Introduction: Mostofthedirectcurrent(DC)powerusedinelectronicdevicesisderivedby converting60Hz,115Valternatingcurrent(AC)powertodirectcurrentpower.Th isACtoDCconversionusuallyinvolvesastep-downtransformer,rectifier

4、,filt er,andaregulator.Thestep-downtransformerisusedtodecreasetheAClinevolt agefrom115VRMStoanRMSvalueneartheDCvoltageneeded.Theoutputofthestep-d owntransformeristhenfedintoadioderectifiercircuitthatonlyoutputsposit ivehalvesoftheinputsinusoid.Afilteristhenusedtosmooththerectifieroutp uttoachieveane

5、arlyconstantDCvoltagelevel.Aregulatorcanbeaddedafterthe filtertoensureaconstantoutputvoltageinspiteofchangesinloadcurrentandi nputvoltages. Twodifferenttypesofvoltageregulatorswillbeusedinthisproject.Thefi rstinvolvesaZenerdiodecircuitandthesecondinvolvesavoltageregulatorcir cuit.AZenerdiodecanbeuse

6、dasavoltageregulatorwhenthediodeisreversebias edandoperatedinthebreakdownregion.Tomaintainvoltageregulation,theZene rdiodemustbeoperatedinthebreakdownregionatacurrentgreaterthantheknee current(IZK).ForcurrentsgreaterthanIZK,theZenerdiodecharacteristiccu rveisnearlyverticalandthevoltageacrossthediode

7、changesverylittle.Ofcou rsethereisamaximumcurrentthediodecantolerate,sogoodregulationisprovid edwhenthediodeisreversebiasedwithcurrentsbetweenIZKandIZMAX.Zenerdiode sareavailablewithawidevarietyofbreakdownvoltages.Anothertypeofvoltage regulatorisavailablewiththe7800seriesregulators.Thisseriesoffixed

8、-vol tageregulatorsisnumbered78xx,wherexxcorrespondstothevalueoftheoutputv oltage.Outputvoltagesfrom5to24voltsareavailable.Theseregulatorsareeas ytouseandworkverywell. Design:Design: 1.FindapproximationsfortheDCvoltagelevelandACpeaktopeakripplevoltagef orthebridgerectifierandfiltercircuitofFigure1-1

9、. 2.FortheZenerdioderegulatorcircuitofFigure1-2assumethattheZenerdiodew illregulateat10Voveracurrentrangeof5mAto25mA.Assumingthatthecurrentfl owingthroughRisalwaysbetween5mAand25mAandtheZenerdiodeisregulatingat1 0V,findtheminimumvaluesofRandRLrequired.Youmayassumetheforwarddiodedr opforthetwodiodesi

10、s1V. LabProcedure:LabProcedure: 1.ConstructthebridgerectifiercircuitofFigure1-1withoutthecapacitor.Us etheVariacwiththestep-downtransformerfortheinputvoltagetothebridgerec tifier.WiththetransformerpluggedintotheVariac,adjusttheVariacuntilthe secondaryvoltagefromthetransformerequals12VRMS.BECAREFULno

11、ttoshortthe secondaryterminals! BECAREFULnottoshortthe secondaryterminals!Observethesecondarywaveformontheoscilloscope.Putth eoscilloscopeonDCcouplingandobservetheloadvoltagewaveformVL.Remembert hatboththeinputsourceandtheloadcannotshareamongroundterminal. 2.Removepowerfromthecircuit.Insertthecapaci

12、torasshowninFigure1-1being suretoobservethecorrectpolarity.Energizethecircuit.Withtheoscilloscop eonDCcoupling observeVL.MeasuretheDCvoltagelevelusingthedigitalvoltmeter.Withtheosc illoscopeonACcouplingobservetheripplevoltageVR.parethesemeasuredvalue swiththecalculatedvalues. 3.Observetheeffectofloa

13、dingonthecircuitbychangingtheloadresistorfrom1 k to500.MeasuretheDCvoltagelevelwiththedigitalvoltmeter.Observetheripp levoltagewiththeoscilloscopesetonACcoupling.parethesevalueswiththepre viouslyrecordedvalues. 4.RecordtheZenerdiodecharacteristiccurvefromthedigitalcurvetracer.Not ethevalueofthebreak

14、downvoltageinthebreakdownregion.Alsonotethevalueof thekneecurrentIZK. 5.AfterverifyingyourdesignedvaluesforRandRLwiththeinstructor,construc ttheZenerdioderegulatorcircuitofFigure1-2.MeasuretheDCvoltagelevelwit hthedigitalvoltmeterfortheminimumvalueofRLalongwithseveralvaluesabove andbelowtheminimumva

15、lue.BecarefulnottooverloadtheZenerdiode.mentonthe circuitsoperationforthesedifferentloadresistances. 6.Constructthe7805regulatorcircuitofFigure1-3beingcarefultoobservethe correctpinconfigurationoftheregulator.MeasuretheloadvoltageforRLequal to300,200,and100.Calculatethecurrentforeachofthesecases.Doe

16、stheval ueoftheloadresistoraffecttheoutputvoltage? 7.UsingRLequalto200,recordthe7805regulatorinputvoltage(pin1)andoutpu tvoltage(pin3).Decreasetheregulatorinputvoltagebydecreasingthesetting oftheVariac.Foreachdecreaseinamplitude,recordtheregulatorinputandoutp utvoltages.Continuedecreasingtheamplitudeuntiltheoutputoftheregulator dropsameasurableamountbelow5V.Whatistheminimuminputvoltageneededforth e7805regulatortoproducea5Voutput? Questions:Questions: 1.Whycanttheinputsourceandloadhaveamongr