電子信息工程專業(yè)英語教程（第6版）課件 Lesson 07 Switching Power Supply

Unit3ElectronicSystemComponentsLesson7SwitchingPowerSupply《電子信息工程專業(yè)英語教程（第6版）》任治剛編著電子工業(yè)出版社

3/6/20251《電子信息工程專業(yè)英語教程》Lesson7SwitchingPowerSupplyBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques3/6/20252《電子信息工程專業(yè)英語教程》TerminologyDominoeffectBackgrounds3/6/20253《電子信息工程專業(yè)英語教程》Terminology3/6/20254《電子信息工程專業(yè)英語教程》Dominoeffect骨牌效應(yīng)Acumulativeeffectproducedwhenoneeventsetsoffachainofsimilarevents:由一件事引發(fā)一系列相似事件的累積效應(yīng)：thedominoeffectofincreasingthespeedlimitinoneofseveralcontiguousstates.幾個(gè)毗鄰州中的一個(gè)州提高汽車速度極限而引起的骨牌效應(yīng)3/6/20255《電子信息工程專業(yè)英語教程》TexttourOutlineLinearversusSwitchingPowerSuppliesBasicConvertersForward-ModeConverterFundamentalsBoost-modeConverterFundamentals3/6/20256《電子信息工程專業(yè)英語教程》Thelinearregulator

Itoperatesby…only30to50percentefficientuneconomicalabove10wattsforsmallapplicationsSwitchingregulator

operatesthepowerdevicesinthefull-onandcutoffstatesefficienciesofbetween70to90percentanattractivechoiceforoutputpowersgreaterthan10wattsorwheremultipleoutputsaredesired

Linearvs.SwitchingPowerSupplies3/6/20257《電子信息工程專業(yè)英語教程》Forward-ModeConverterOperationBasicConverters

Forward-ModeConverterFundamentals3/6/20258《電子信息工程專業(yè)英語教程》Forward-ModeConverterOperationBasicConverters

Forward-ModeConverterFundamentals3/6/20259《電子信息工程專業(yè)英語教程》SchematicofaBoostConverterBasicConverters

Boost-modeConverterFundamentals3/6/202510《電子信息工程專業(yè)英語教程》WaveformsforaBoostConverterBasicConverters

Boost-modeConverterFundamentals3/6/202511《電子信息工程專業(yè)英語教程》Vocabularyload,cutoff,flux,barrier,effect,conditionStructureReading/writingtechniquesLanguageinuse3/6/202512《電子信息工程專業(yè)英語教程》Vocabulary3/6/202513《電子信息工程專業(yè)英語教程》LoadindictionaryAweightormassthatissupported:

負(fù)重Theoverallforcetowhichastructureissubjectedinsupportingaweightormassorinresistingexternallyappliedforces.

負(fù)載量Somethingthatiscarried,asbyavehicle,aperson,orananimal:

裝載物Thequantitythatisorcanbecarriedatonetime.

裝載量Theshareofworkallocatedtoorrequiredofaperson,amachine,agroup,oranorganization.

工作負(fù)荷量3/6/202514《電子信息工程專業(yè)英語教程》LoadindictionaryThedemandforservicesorperformancemadeonamachineorsystem.

負(fù)荷Theamountofmaterialthatcanbeinsertedintoadeviceormachineatonetime:

裝填量Amentalweightorburden:

精神負(fù)擔(dān)Aresponsibilityregardedasoppressive.

負(fù)擔(dān)Thepoweroutputofageneratororpowerplant.

發(fā)電量3/6/202515《電子信息工程專業(yè)英語教程》LoadintextHistorically,thelinearregulatorwastheprimarymethodofcreatingaregulatedoutputvoltage.Itoperatesbyreducingahigherinputvoltagedowntotheloweroutputvoltagebylinearlycontrollingtheconductivityofaseriespasspowerdeviceinresponsetochangesinitsload.Thisresultsinalargevoltagebeingplacedacrossthepassunitwiththeloadcurrentflowingthroughit.在歷史上，線性穩(wěn)壓器曾是產(chǎn)生穩(wěn)壓輸出電壓的主要方法。通過對級聯(lián)功率通過器件導(dǎo)電性線性控制以響應(yīng)負(fù)載變化，線性穩(wěn)壓器將輸入高電壓降為輸出低電壓。這種方法導(dǎo)致在負(fù)載電流流經(jīng)的通過單元兩端出現(xiàn)一個(gè)大電壓。3/6/202516《電子信息工程專業(yè)英語教程》Loadinuse

admissibleload容許載重capacitiveload電容性負(fù)載circuitload電路負(fù)荷,線路負(fù)荷inductiveload電感負(fù)載ohmicload電阻負(fù)載outputload輸出負(fù)載safeload安全載荷unmatchedload不匹配負(fù)載3/6/202517《電子信息工程專業(yè)英語教程》CutoffindictionaryAdesignatedlimitorpointoftermination.

截止期Ashortcutorbypass.

近路，捷徑Theactoraninstanceofcuttingoff:

切斷Designatingalimitorpointoftermination:

截止的Thepointofdegradation,duetoattenuationordistortion,atwhichasignalbecomesunusable.

截止點(diǎn)3/6/202518《電子信息工程專業(yè)英語教程》CutoffintextTheswitchingregulatoroperatesthepowerdevicesinthefull-onandcutoff

states.Thisthenresultsineitherlargecurrentsbeingpassedthroughthepowerdeviceswithalow“on’’voltageornocurrentflowingwithhighvoltageacrossthedevice.開關(guān)電源中的功率器件工作在全開和截?cái)酄顟B(tài)。這樣，要么在大電流流經(jīng)功率器件時(shí)，導(dǎo)通電壓很低；要么在大電壓時(shí)，沒有電流通過器件。

3/6/202519《電子信息工程專業(yè)英語教程》Cutoffinuse

current-gaincutoff電流增益截止grid-currentcutoff柵流截止grid-voltagecutoff柵壓截止3/6/202520《電子信息工程專業(yè)英語教程》FluxindictionaryAfloworflowing.流動(dòng)Acontinuedflow;aflood.洪流Thelinesofforceofamagneticfield.磁力線Constantorfrequentchange;fluctuation.變遷；波動(dòng)：Asubstancethataids,induces,orotherwiseactivelyparticipatesinfusingorflowing熔劑Asubstanceappliedtoasurfacetobejoinedbywelding,soldering,orbrazingtofacilitatetheflowingofsolderandpreventformationofoxides.焊劑3/6/202521《電子信息工程專業(yè)英語教程》FluxintextDuringthe“on”period,energyisbeingstoredwithinthecorematerialoftheinductorintheformofflux.Thereissufficientenergystoredtocarrytherequirementsoftheloadduringthenextoffperiod.在“接通”周期，能量以磁通的形式存儲在電感的鐵芯材料中。存儲的能量足以滿足負(fù)載在下一個(gè)“斷開”周期的需求。3/6/202522《電子信息工程專業(yè)英語教程》Fluxinuse

acidicflux酸性熔(焊)劑batteryflux蓄電池流出量coreflux鐵心通量magneticflux磁通量non-oxygenflux無氧焊劑rosinflux焊劑scalarflux標(biāo)量通量short-circuitflux短路磁通,短路通量3/6/202523《電子信息工程專業(yè)英語教程》BarrierindictionaryAstructure,suchasafence,builttobarpassage.

柵欄，擋板，壁壘，關(guān)卡Somethingimmaterialthatobstructsorimpedes:

妨礙Aboundaryorlimit.

界線或限制Somethingthatseparatesorholdsapart.

隔離物3/6/202524《電子信息工程專業(yè)英語教程》BarrierintextNon-isolatedswitchingpowersuppliesaretypicallyusedforboard-levelregulationwhereadielectricbarrierisprovidedelsewherewithinthesystem.非隔離開關(guān)電源的典型應(yīng)用為具備絕緣隔板的系統(tǒng)提供板級電壓調(diào)理。3/6/202525《電子信息工程專業(yè)英語教程》Barrierinuse

airbarrier氣密層;內(nèi)襯層collectorbarrier集電極勢壘contact(potential)barrier接觸勢壘customsbarrier關(guān)稅壁壘emitterbarrier發(fā)射極勢壘firebarriers防火間隔languagebarrier語言障礙sonicbarrier音障,聲壘waterbarrier防水層3/6/202526《電子信息工程專業(yè)英語教程》EffectindictionarySomethingbroughtaboutbyacauseoranagent;aresult.結(jié)果Thepowertoproduceanoutcomeorachievearesult;influence:影響Ascientificlaw,hypothesis,orphenomenon:效應(yīng)Advantage;avail:利益；效益：Theconditionofbeinginfullforceorexecution:生效,實(shí)施Somethingthatproducesaspecificimpressionorsupportsageneraldesignorintention:感受，效果Aparticularimpression:特殊印象：Productionofadesiredimpression:印象Thebasicorgeneralmeaning;import:主旨；要點(diǎn)：3/6/202527《電子信息工程專業(yè)英語教程》EffectintextThecompaniesbuildingtheirownpowersystemsareleaningtowardtransformerisolationinasmanypowersuppliesaspossiblesinceitpreventsadominoeffectduringfailureconditions

制造自己系統(tǒng)電源的公司傾向于在盡可能多的電源中采用變壓器隔離，因?yàn)檫@種隔離避免了故障出現(xiàn)時(shí)將產(chǎn)生的連鎖反應(yīng)。3/6/202528《電子信息工程專業(yè)英語教程》Effectinuse

effectconsequenceresultoutcome

Aneffectisproducedbytheactionofanagentoracauseandfollowsitintime:Aconsequencealsofollowsacauseandistraceabletoit,buttherelationshipbetweenthemislesssharplydefinableAresultisaneffect,orthelastinaseriesofeffects,thatisviewedastheendproductoftheoperationofthecause:Anoutcomeisaresultbutmorestronglythanresultimpliesfinalityandmaysuggesttheoperationofacauseoverarelativelylongperiod:3/6/202529《電子信息工程專業(yè)英語教程》ConditionindictionaryAmodeorstateofbeing:

狀態(tài)或狀況：Astateofreadinessorphysicalfitness.

生理狀況Adiseaseorphysicalailment:

疾病或身體不適Socialposition;rank.

社會地位；身份Onethatisindispensabletotheappe