自動(dòng)化專業(yè)英語4課件_第1頁
自動(dòng)化專業(yè)英語4課件_第2頁
自動(dòng)化專業(yè)英語4課件_第3頁
自動(dòng)化專業(yè)英語4課件_第4頁
自動(dòng)化專業(yè)英語4課件_第5頁
已閱讀5頁,還剩32頁未讀, 繼續(xù)免費(fèi)閱讀

下載本文檔

版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)

文檔簡介

PART1ElectricalandElectronicEngineeringBasicsSection4PowerSemiconductorDevicesNewWordsandExpressions

LanguagepointsComplementNewWordsandExpressionsconvertern.轉(zhuǎn)換器,換流器,變流器matrixn.模型,矩陣dioden.二極管,半導(dǎo)體二極管thyristorn.晶閘管triacn.三端雙向晶閘管GTO門極可關(guān)斷晶閘管BJT雙極結(jié)型晶體管powerMOSFET電力MOS場效應(yīng)晶體管SIT靜態(tài)感應(yīng)晶體管NewWordsandExpressionsIGBT絕緣柵雙極型晶體管MCTMOS控制晶閘管IGCT集成門極換向晶閘管rectificationn.整流feedbackn.反饋freewheelingn.單向傳動(dòng)snubbern.緩沖器,減震器intrinsicadj.固有的,體內(nèi)的,本征NewWordsandExpressionsforwardbiased正向偏置conductionn.

導(dǎo)電,傳導(dǎo)reversebiased反向偏置leakagecurrent漏電流thresholdn.門限,閾限,極限breakdownn.擊穿,雪崩recoveryn.恢復(fù)schottkydiode肖基特二極管NewWordsandExpressionsworkhorsen.重載,重負(fù)荷thyratronn.閘流管breakovern.導(dǎo)通latchingcurrent閉鎖電流holdingcurrent保持電流phasecontrolled相控的asymmetricadj.不對(duì)稱的forcecommutated強(qiáng)制換向NewWordsandExpressionsSMPS開關(guān)電源BLDM無刷直流電動(dòng)機(jī)steppermotor步進(jìn)電動(dòng)機(jī)hybridn.混合emittern.發(fā)射極saturationn.飽和LanguagePoints[1]Powersemiconductordevicescons-titutetheheartofmodernpowerelectronicapparatus.Theyareusedinpowerelec-tronicconversionintheformofamatrixofon-offswitches.Andtheswitchingmodepowerconversiongiveshighefficiency.LanguagePoints[3]Theyarealsousedinfeedbackandthefreewheelingfunctionsofconvertersandsnubbers.AtypicalpowerdiodehasP-I-Nstructure,thatis,itisaP-Njunctionwithanearintrinsicsemiconductorlayer(I-layer)inthemiddletosustainreversevoltage.LanguagePoints[4]Ifthereversevoltageexceedsathre-sholdvalue,calledthebreakdownvoltage,thedevicegoesthroughavalanchebreak-down,whichiswhenreversecurrentbecomeslargeandthediodeisdestroyedbyheatingduetolargepowerdissipationinthejunction.LanguagePoints[5]Thyristors,orsilicon-controlledrectifiers(SCRs)havebeenthetraditionalworkhorsesforbulkpowerconversionandcontrolinindustry.Themoderneraofsolid-statepowerelectronicsstartedduetotheintroductionofthisdeviceinthelate1950s.LanguagePoints[6]Often,itisafamilynamethatincludesSCR,TRIAC,GTO,MCT,andIGCT.Thy-ristorscanbeclassifiedasstandard,orslowphase-control-typeandfast-switching,voltage-fedinverter-type.Theinverter-typehasrecentlybecomeobsolete.LanguagePoints[7]Basically,thyristorisathree-junctionP-N-P-Ndevice,whereP-N-PandN-P-Ncomponenttransistorsareconnectedinregenerativefeedbackmode.Thedeviceblocksvoltageinboththeforwardandreversedirection(symmetricblocking).LanguagePoints[8]Atriacshasacomplexmultiple-junctionstructure,butfunctionally,itisanintegrationofapairofphase-controlledthyristorsconnectedininverse-parallelonthesamechip.LanguagePoints[9]Awell-designedRCsnubberisessen-tialforatriaccircuit.Triacsareusedinlightdimming,heatingcontrol,alliance-typemotordrives,andsolid-staterelayswithtypically50/60Hzsupplyfrequency.LanguagePoints[11]GTOsareavailablewithasymmetricandsymmetricvoltage-blockingcapabilities,whichareusedinvoltage-fedandcurrent-fedconverters,respectively.[12]GTOsareusedinmotordrives,staticVARcompensators(SVCs),andAC/DCpowersupplieswithhighpowerratings.Whenlarge-powerGTOsbecameavailable,theyoustedtheforce-commutated,voltage-fedthyristorinverters.LanguagePoints[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.LanguagePoints[15]Theintroductionofinsulatedgatebipolartransistorsinthemid-1980swasanimportantmilestoneinthehistoryofpowersemiconductordevices.TheyareextremelypopulardevicesinpowerelectronicsuptomediumpowerrangeandareappliedextensivelyinDC/ACdrivesandpowersupplysystems.TheyoustedBJTsintheupperrange,andarecurrentlyoustingGTOsinthelowerpowerrange.LanguagePoints[16]AnIGBTisbasicallyahybridMOS-gatedturn-on/offbipolartransistorthatcombinestheadvantagesofbothaMOSFETandBJT.ItsarchitectureisessentiallysimilartothatofaMOSFET,exceptanadditionalP+layerhasbeenaddedatthecollectorovertheN+drainlayeroftheMOSFET.LanguagePoints[17]AnMOS-controlledthyristor,asthenameindicates,isathyristor-like,trigger-into-conductionhybriddevicethatcanbeturnedonoroffbyashortvoltagepulseontheMOSgate.Thedevicehasamicrocellconstruction,wherethousandsofmicrodevicesareconnectedinparallelonthesamechip.Thecellstructureissomewhatcomplex.LanguagePoints[18]TheMCTwascommerciallyintroducedin1992,andcurrently,medium-powerdevicesareavailablecommercially.Thefutureacceptanceofthedeviceremainsuncertainatthispoint.[19]Basically,itisahigh-voltage,high-power,hard-driven,asymmetric-blockingGTOwithunityturn-offcurrentgain.LanguagePoints[21]IGCThasbeenappliedinpowersystemintertieinstallationsandmedium-powerindustrialdrives.ExercisesI.TranslatethefollowingintoChinese

Allthesimplecircuitelementsthatwillbeconsideredintheworkthatfollowscanbeclassifiedaccordingtotherelationshipofthecurrentthroughtheelementtothevoltageacrosstheelement.Forinstance,ifthevoltageacrosstheelementisdirectlyproportionaltothecurrentthroughit,oru=ki,weshallcalltheelementaresistor.Othertypesofsimplecircuitelementshaveaterminalvoltagewhichisproportionaltothetimederivativeortheintegralwithrespecttotimeofthecurrent.ThereExercisesI.TranslatethefollowingintoChinese

arealsoelementsinwhichthevoltageiscompletelyindependentofthecurrentorthecurrentiscompletelyindependentofthevoltage;thesearetheindependentsources.Furthermore,weshallneedtodefinespecialkindsofsourcesinwhichthesourcevoltageorcurrentdependsuponacurrentorvoltageelsewhereinthecircuit;suchsourceswillbetermeddependentsourcesorcontrolledsources.VocabularyCharacteristicI一、前綴(prefixes)1.anti-/counter-

反,抗,防,逆,耐

antivirus

防病毒;

anti-interference抗干擾;anti-phase

反相;

counterclockwise逆時(shí)針方向的(地);countercurrent反向電流。2.

auto-

自動(dòng)、自

autotransformer

自耦變壓器;

autocoder自動(dòng)編碼器;

automodulation自調(diào)制;

automobile自動(dòng)車。VocabularyCharacteristicI3.bi-

雙,重

bipolarrelay

雙極繼電器;

bilateral兩邊的,雙邊的;雙金屬。4.co-

共,同,一起,相互

coaxialcable

同軸電纜;

cosine

余弦。5.de-

表示相反動(dòng)作

demodulator解調(diào)器;

deform

變形。6.deci-

表示十分之一,分

decimal十進(jìn)制;decibel分貝;decimeter分米VocabularyCharacteristicI7.di-雙,偶,兩

diode

二極管;dipole

偶極子;

dioxide

二氧化物。8.dis-

表示相對(duì)單詞的反義詞

displace

位移;

disconnect解開,斷開。9.equi-同等,均

equipartition均分;equilibrium均衡,平衡。10.hydro-

水,氫化

hydrodynamic

水力的,水壓的,流體動(dòng)力學(xué)的;

hydroelectric水力發(fā)電的。11.

hyper-

高,超,重,極度

VocabularyCharacteristicI12.in-

表示否定

inaccurate不精確的;invariable不變的。13.inter-

相互,際間

internet互聯(lián)網(wǎng);interchange

互換;

interface

界面;intercitytrain

城際列車。14.mal-不,失

malfunction失靈,故障;malformation畸形;

maltreat濫用,亂用。15.mega-兆,百萬

megawatt兆瓦;megaton百萬噸級(jí)。VocabularyCharacteristicI16.micro-微觀,微型,百萬分之一

microelectronics

微電子學(xué);

microcomputer微型計(jì)算機(jī);

microfilm

微縮膠卷;micrometer微米;

microwave微波。17.mini-

minicomputer小型計(jì)算機(jī);

minibus微型公共汽車。18.multi-多

multi-frequency多頻率。19.over-過,超,太

overfrequency

超頻;overcharge

過度充電。VocabularyCharacteristicI20.photo-光,光電,光敏

photocell光電池;photohead光電傳感頭;

photoreceptor感光器。21.post-后

postfault故障后。22.pre-

在前,預(yù)先

preheat

預(yù)熱;precondition

前提,先決條件。23.semi-

semiconductor

半導(dǎo)體。24.sub-

子,亞,低,次,副

subsystem子系統(tǒng),分系統(tǒng);substation變電站

subcode

子碼。VocabularyCharacteristicI25.tele-遠(yuǎn),電

telemetry遙測術(shù);telecommunication

電信;

teleswitch遙控開關(guān);telecontrol

遙控。26.thermo-

thermostat

恒溫器;thermoelectric熱電的;

thermo-fuse

熱熔絲。27.tri-

triangle

三角形。

28.ultra-

超,過

ultra-high-frequency超高頻;ultrasonic超聲波29.un-表示相反的意思

unequal不等;unvarying不變的。VocabularyCharacteristicII一、后綴(suffixes)1.–able

形容詞的詞尾,表示“……的”

stable

穩(wěn)定的;reliable

可靠的;

comparable可比較的。2.–al

形容詞詞尾,表示“……的”

digital

數(shù)字的;functional

功能的,函數(shù)的。3.-ance/-ence

名詞詞尾

capacitance電容;resistance電阻;

reactance

電抗;existence

存在。4.–ary

形容詞詞尾,表示“……”

elementary

初步的;momentary

瞬息的。VocabularyCharacteristicII5.–en

一般是形容詞+en構(gòu)成,表示“使……”

soften軟化;

harden

使……變硬。6.-er/-or

表示“機(jī)器、設(shè)備、物件等”

air-oilbooster

氣-液增壓器;

aircompressor

空氣壓縮機(jī)。7.–free

形容詞詞尾,表示“無……的”,“免于……的”

loss-free

無損耗的;dust-free

無塵的。8.–ics

名詞詞尾,表示學(xué)科名稱

physics

物理學(xué);mathematics

數(shù)學(xué);

electronics電子學(xué)。VocabularyCharacteristicII9.–ity

構(gòu)成抽象名詞,表示“性,度”

stability

穩(wěn)定性;reliability可靠性;

feasibility

可行性。10.–ive

形容詞詞尾,表示“……的”

溫馨提示

  • 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 人人文庫網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。

評(píng)論

0/150

提交評(píng)論