UNIT6 power electronictechnology experiment guid.docx
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UNIT6 power electronictechnology experiment guid.docx
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UNIT6powerelectronictechnologyexperimentguid
UNIT6PowerElectronicsLaboratoryUserManual①
Keywordsandterms
1.convertern.变流器、变换器
2.buckconverter降压变流器
3.arcingn.电弧、放电
4.firstaidadj.急救的
5.kitn.装备,工具箱
6.transformern.变压器
7.oscilloscopen.示波器
8.CPR(cardiopulmonaryresuscitation)心肺复苏术
[.kɑ:
diəu'pʌlmənəri][ri.sʌsi'teiʃən;ri.sʌsə'teiʃən]
9.boostconverter升压变流器
10.dutyratio占空比
11.CCMContinuousCurrentMode
12.ripplen.(波形)脉动
13.step-uptransformer.升压变压器
Cardio-(wordroot)心脏、心的
Cardiopulmonarya.心肺的
NoteandTranslation
SAFETYPRECAUTIONS
1Whyissafetyimportant?
Attentionandadherencetosafetyconsiderationsisevenmoreimportantinapowerelectronicslaboratorythanit’srequiredinanyotherundergraduateelectricalengineeringlaboratories.Powerelectroniccircuitscaninvolvevoltagesofseveralhundredvoltsandcurrentsofseveraltensofamperes.Bycomparisonthevoltagesinallotherteachinglaboratoriesrarelyexceed20Vandthecurrentshardlyeverexceedafewhundredmilliamps.
adherencen.吸附、固着、坚持、遵守
Inordertominimizethepotentialhazards,wewillusedcpowersuppliesthatneverexceedvoltagesabove40-50Vandwillhavemaximumcurrentratingsof20Aorless.Mostofthetimewewillusedcsuppliesof20Vorlessand1Aorlessoutputcurrentcapability.Howeverinspiteofthisprecaution,powerelectronicscircuitsonwhichthestudentwillworkmayinvolvesubstantiallylargervoltages(uptohundredsofvolts)duetothepresenceoflargeinductancesinthecircuitsandtherapidswitchingonandoffofamperesofcurrentintheinductances.Forexampleaboostconvertercanhaveanoutputvoltagethatcantheoreticallygotoinfinitevaluesifitisoperatingwithoutload.
inductancen.电感
theoreticallyad.理论上地
Moreoverthecurrentsinportionsofsomeconvertercircuitsmaybemanytimeslargerthanthecurrentssuppliedbythedcsuppliespoweringtheconvertercircuits.Asimplebuckconverterisanexampleofapowerelectronicscircuitinwhichtheoutputcurrentmaybemuchlargerthanthedcsupplycurrent.
2PotentialproblemspresentedbyPowerElectroniccircuits
•Electricalshockmaytakealife.
•Explodingcomponents(especiallyelectrolyticcapacitors)andarcingcircuitscancauseblindnessandsevereburns.
•Burningcomponentsandarcingcanleadtofire.
电击可能致命、
易爆的元件(特别是电容)和电弧可能导致失明或严重烧伤
易燃元件和电弧可能引起火灾
3Safetyprecautionstominimizethesehazards
3.1GeneralPrecautions
•Becalmandrelaxed,whileworkinginLab.
•Whenworkingwithvoltagesover40Vorwithcurrentsover10A,theremustbeatleasttwopeopleinthelabatalltimes.
•Keeptheworkareaneatandclean.
•Nopaperlyingontableornearbycircuits.
•Alwayswearsafetyglasseswhenworkingwiththecircuitathighpowerorhighvoltage.
•Userubberfloormats(ifavailable)toinsulateyourselffromground,whenworkingintheLab.
•Besureaboutthelocationsoffireextinguishersandfirstaidkitsinlab.
•Aswitchshouldbeincludedineachsupplycircuitsothatwhenopened,theseswitcheswillde-energizetheentiresetup.Placetheseswitchessothatyoucanreachthemquicklyincaseofemergency,andwithoutreachingacrosshotorhighvoltagecomponents.
电源回路必须有开关,当开关断开时可以切断电源。
将开关放置在紧急情况时可以操作的地方(而不是要通过高温或高压元件)。
3.2Precautionstobetakenwhenpreparingacircuit
•Useonlyisolatedpowersources(eitherisolatedpowersuppliesorACpowerthroughisolationpowertransformers).Thishelpsusingagroundedoscilloscopeandreducesthepossibilityofriskofcompletingacircuitthroughyourbodyordestroyingthetestequipment.
只使用绝缘的电源(包括绝缘的电源线以及从变压器出来的交流线)。
这样将有助于使用接地示波器并减小通过身体形成回路和损坏测试设备的危险。
3.3Precautionstobetakenbeforepoweringthecircuit
•Checkforalltheconnectionsofthecircuitandscopeconnectionsbeforepoweringthecircuit,toavoidshortingoranygroundlooping,thatmayleadtoelectricalshocksordamageofequipment.
•Checkanyconnectionsforshortingtwodifferentvoltagelevels.
•Checkifyouhaveconnectedloadattheoutput.
•Doublecheckyourwiringandcircuitconnections.Itisagoodideatouseapoint-to-pointwiringdiagramtoreviewwhenmakingthesechecks.
shorting短路
3.4Precautionswhileswitchingonthecircuit
•Applylowvoltagesorlowpowertocheckproperfunctionalityofcircuits.
•Oncefunctionalityisproven,increasevoltagesorpower,stoppingatfrequentlevelstocheckforproperfunctioningofcircuitorforanycomponentsishotorforanyelectricalnoisethatcanaffectthecircuit’soperation.
stoppingatfrequentlevels指逐渐(并不时停顿)地增加电压
3.5Precautionswhileswitchingofforshuttingdownthecircuit
•Reducethevoltageorpowerslowlytillitcomestozero.
•Switchofallthepowersuppliesandremovethepowersupplyconnections.
•Lettheloadbeconnectedattheoutputforsometime,sothatithelpstodischargecapacitororinductorifany,completely.
3.6Precautionswhilemodifyingthecircuit
•SwitchOffthecircuitasperthestepsinsection3.5.
•Modifytheconnectionsasperyourrequirement.
•Againcheckthecircuitasperstepsinsection3.3,andswitchONasperstepsinsection3.4.
3.7OtherPrecautions
•Noloosewiresormetalpiecesshouldbelyingontableornearthecircuit,tocauseshortsandsparking.
•Avoidusinglongwires,thatmaygetinyourwaywhilemakingadjustmentsorchangingleads.
•Keephighvoltagepartsandconnectionsoutofthewayfromaccidentaltouchingandfromanycontactstotestequipmentoranyparts,connectedtoothervoltagelevels.
•Whenworkingwithinductivecircuits,reducevoltagesorcurrentstonearzerobeforeswitchingopenthecircuits.
•BEAWAREofbracelets,rings,metalwatchbands,andloosenecklace(ifyouarewearinganyofthem),theyconductelectricityandcancauseburns.Donotwearthemnearanenergizedcircuit.
•LearnCPRandkeepuptodate.Youcansavealife.
•Whenworkingwithenergizedcircuits(whileoperatingswitches,adjustingcontrols,adjustingtestequipment),useonlyonehandwhilekeepingtherestofyourbodyawayfromconductingsurfaces.
beawareof意识到、知道、了解
braceletn.手镯
necklacen.项链
BoostConverterExperiment
3.1Objective
Theobjectiveofthisexperimentistostudythecharacteristicsofasimpleboostconverter.ThecircuitwillbeoperatedunderCCMandopenloopcondition.Ourmaingoalistocomparethetheoreticalresultswiththeexperimentalresults.
Note:
Itisimportantthatcareistakenwhiledoingtheboostconverterexperimentusingthepower-poleboard②.Theinputandoutputterminalsinthecaseoftheboostconverterareinterchangedascomparedtothatofthebuckconverter.V2+&COMistheinputandV1+&COMistheoutput.③
3.2PreparingtheSetup
Maketheconnectionsofthepower-poleboardasshowninFig.1tousethelowerMOSFETandtheupperdiode.
•UsetheBBmagneticsboard④fortheboostcircuit.Theinductoris100μH.
•Useavariableloadresistorasaload.
•Connectthe±12signalsupplytotheDINconnector.SignalsupplyswitchS90shouldbeOFF.
variableloadresistor可变电阻(器)
3.3Checksbeforepoweringthecircuit
•Checkthecircuitconnectionsaspertheschematics.
MIDPONT
LEM
•ConfirmthatyouhaveconnectedtheinputandoutputterminalscorrectlytosourceandloadasshowninFig.1.
•HaveyourcircuitcheckedbyyourLabInstructor.
LabInstructor实验指导教师
3.4PoweringtheCircuit
•SwitchONthesignalsupply.CheckforgreenLED.
•Setthedutyratiotoitsminimum.
•SetRL=50Ω.
•Adjusttheswitchingfrequencyto100kHz.
•ApplyinputvoltageVdof10voltsatterminalsV2+andCOM.
3.5Measurements
Takethefollowingmeasurements,
3.5.1VaryingDutyRatio
•Varythedutyratiofromminimumto70%(instepsof10%).
•MeasuretheaverageDCloadvoltage(V1+)forthecorrespondingvaluesofdutyratio.
•Calculatethetheoreticalaverageoutputvoltageforthecorrespondingdutyratios.
•Comparetheobservedaverageoutputvoltageresultswiththecalculatedones.
3.5.2VaryingSwitchingFrequency
•Setthedutyratioto50%,switchingfrequencyto100kHz,RL=50Ω.
•Observeandmakeacopyoftheinputcurrent(CS5⑤)ripplewaveform.
•Observeandmakeacopyoftheoutputvoltage(V1+)ripplewaveform.
•Calculatethepeak-peakinputcurrentripple.
•Repeattheaboveprocedurefordifferentswitchingfrequencies(say40kHz,60kHz,80kHz).
3.5.3VaryingLoad
•Setthedutyratioto35%,RL=50Ωandswitchingfrequencyto100kHz.
•Keepincreasingtheloaduntiltheconverterentersintothediscontinuousconductionmode.⑥
•Observeandmakeacopyoftheinputcurrenttoidentifythattheboostconverterhasgoneintodiscontinuousconductionmode.
•ObserveandmakeacopyofthevoltageacrossMOSFET,voltagewaveformacrossdiode(Usedifferentialprobe).
differentialprobe差动探头
3.5.4DeterminingEfficiency
•Setthedutyratioto50%.
•Adjusttheloadresistancesothatloadcurrentis0.4A.
•Measuretheefficiencyatswitchingfrequenciesof40kHz,60kHz,80kHz,100kHz.
3.6LabReport
Thelabreportshouldhaveabriefabstractdetailingwhathasbeendoneintheexperiment.Theremainingpartofthereportshouldconsistoftheinformationaskedbelowalongwithanydiscussionyoufeelisnecessary⑦.
•Attachagraphofdutyratioversusoutputvoltageusingthedataobtainedinsection3.5.1.Alsoplotthetheoreticallycalculatedresultsonthesamegraph.Comparethetwoplots.Commentabouthowtheboostconverterworksasavariabledcstep-uptransformer.
•Plotthepeak-peakrippleintheoutputvoltageversusswitchingfrequencyusingthedataobtainedinsection3.5.2.Plotthetheoreticalresultsonthesamegraph.Comparethetwograph
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