自动化专业英语3.

Date:2019/12/17Page:1常用低压电器CH1Date:2019/12/17Page:1专业英语CH1PART1ElectricalandElectronicEngineeringBasicsDate:2019/12/17Page:2常用低压电器CH1Date:2019/12/17Page:2专业英语CH1Section4PowerSemiconductorDevicesNewWordsandExpressionsLanguagepointsComplementDate:2019/12/17Page:3常用低压电器CH1Date:2019/12/17Page:3专业英语CH1NewWordsandExpressionsconvertern.转换器，换流器，变流器matrixn.模型，矩阵dioden.二极管，半导体二极管thyristorn.晶闸管triacn.三端双向晶闸管GTO门极可关断晶闸管BJT双极结型晶体管powerMOSFET电力MOS场效应晶体管SIT静态感应晶体管Date:2019/12/17Page:4常用低压电器CH1Date:2019/12/17Page:4专业英语CH1NewWordsandExpressionsIGBT绝缘栅双极型晶体管MCTMOS控制晶闸管IGCT集成门极换向晶闸管rectificationn.整流feedbackn.反馈freewheelingn.单向传动snubbern.缓冲器，减震器intrinsicadj.固有的，体内的，本征Date:2019/12/17Page:5常用低压电器CH1Date:2019/12/17Page:5专业英语CH1NewWordsandExpressionsforwardbiased正向偏置conductionn.导电,传导reversebiased反向偏置leakagecurrent漏电流thresholdn.门限，阈限，极限breakdownn.击穿，雪崩recoveryn.恢复schottkydiode肖基特二极管Date:2019/12/17Page:6常用低压电器CH1Date:2019/12/17Page:6专业英语CH1NewWordsandExpressionsworkhorsen.重载，重负荷thyratronn.闸流管breakovern.导通latchingcurrent闭锁电流holdingcurrent保持电流phasecontrolled相控的asymmetricadj.不对称的forcecommutated强制换向Date:2019/12/17Page:7常用低压电器CH1Date:2019/12/17Page:7专业英语CH1NewWordsandExpressionsSMPS开关电源BLDM无刷直流电动机steppermotor步进电动机hybridn.混合emittern.发射极saturationn.饱和Date:2019/12/17Page:8常用低压电器CH1Date:2019/12/17Page:8专业英语CH1LanguagePoints[1]Powersemiconductordevicescons-titutetheheartofmodernpowerelectronicapparatus.Theyareusedinpowerelec-tronicconversionintheformofamatrixofon-offswitches.Andtheswitchingmodepowerconversiongiveshighefficiency.Date:2019/12/17Page:9常用低压电器CH1Date:2019/12/17Page:9专业英语CH1LanguagePoints[2]Powerdiodesprovideuncontrolledrec-tificationofpowerandareusedinappli-cationssuchaselectroplating,ano-dizing,batterycharging,welding,powersupplies(DCandAC),andvariable-frequencydrives.Date:2019/12/17Page:10常用低压电器CH1Date:2019/12/17Page:10专业英语CH1LanguagePoints[3]Theyarealsousedinfeedbackandthefreewheelingfunctionsofconvertersandsnubbers.AtypicalpowerdiodehasP-I-Nstructure,thatis,itisaP-Njunctionwithanearintrinsicsemiconductorlayer(I-layer)inthemiddletosustainreversevoltage.Date:2019/12/17Page:11常用低压电器CH1Date:2019/12/17Page:11专业英语CH1LanguagePoints[4]Ifthereversevoltageexceedsathre-sholdvalue,calledthebreakdownvoltage,thedevicegoesthroughavalanchebreak-down,whichiswhenreversecurrentbecomeslargeandthediodeisdestroyedbyheatingduetolargepowerdissipationinthejunction.Date:2019/12/17Page:12常用低压电器CH1Date:2019/12/17Page:12专业英语CH1LanguagePoints[5]Thyristors,orsilicon-controlledrectifiers(SCRs)havebeenthetraditionalworkhorsesforbulkpowerconversionandcontrolinindustry.Themoderneraofsolid-statepowerelectronicsstartedduetotheintroductionofthisdeviceinthelate1950s.Date:2019/12/17Page:13常用低压电器CH1Date:2019/12/17Page:13专业英语CH1LanguagePoints[6]Often,itisafamilynamethatincludesSCR,TRIAC,GTO,MCT,andIGCT.Thy-ristorscanbeclassifiedasstandard,orslowphase-control-typeandfast-switching,voltage-fedinverter-type.Theinverter-typehasrecentlybecomeobsolete.Date:2019/12/17Page:14常用低压电器CH1Date:2019/12/17Page:14专业英语CH1LanguagePoints[7]Basically,thyristorisathree-junctionP-N-P-Ndevice,whereP-N-PandN-P-Ncomponenttransistorsareconnectedinregenerativefeedbackmode.Thedeviceblocksvoltageinboththeforwardandreversedirection(symmetricblocking).Date:2019/12/17Page:15常用低压电器CH1Date:2019/12/17Page:15专业英语CH1LanguagePoints[8]Atriacshasacomplexmultiple-junctionstructure,butfunctionally,itisanintegrationofapairofphase-controlledthyristorsconnectedininverse-parallelonthesamechip.Date:2019/12/17Page:16常用低压电器CH1Date:2019/12/17Page:16专业英语CH1LanguagePoints[9]Awell-designedRCsnubberisessen-tialforatriaccircuit.Triacsareusedinlightdimming,heatingcontrol,alliance-typemotordrives,andsolid-staterelayswithtypically50/60Hzsupplyfrequency.Date:2019/12/17Page:17常用低压电器CH1Date:2019/12/17Page:17专业英语CH1LanguagePoints[10]Agateturn-offthyristor(GTO),asthenameindicates,isbasicallyathyristor-typedevicethatcanbeturnedonbyasmallpositivegatecurrentpulse,butinaddition，hasthecapabilityofbeingturnedoffbyanegativegatecurrentpulse．Date:2019/12/17Page:18常用低压电器CH1Date:2019/12/17Page:18专业英语CH1LanguagePoints[11]GTOsareavailablewithasymmetricandsymmetricvoltage-blockingcapabilities,whichareusedinvoltage-fedandcurrent-fedconverters,respectively．[12]GTOsareusedinmotordrives,staticVARcompensators(SVCs),andAC/DCpowersupplieswithhighpowerratings.Whenlarge-powerGTOsbecameavailable,theyoustedtheforce-commutated,voltage-fedthyristorinverters.Date:2019/12/17Page:19常用低压电器CH1Date:2019/12/17Page:19专业英语CH1LanguagePoints[13]Unlikethedevicesdiscussedsofar,apowerMOSFET(metal-oxidesemi-conductorfield-effecttransistor)isaunipolar,majoritycarrier,“zerojunction”,voltage-controlleddevice．[14]MOSFETsareextremelypopularinlow-voltage,low-power,andhigh-frequen-cyswitchingapplications,includeswitchingmodepowersupplies,brushlessDCmo-tors,steppermotordrives,andsolid-stateDCrelays.Date:2019/12/17Page:20常用低压电器CH1Date:2019/12/17Page:20专业英语CH1LanguagePoints[15]Theintroductionofinsulatedgatebipolartransistorsinthemid-1980swasanimportantmilestoneinthehistoryofpow