电子信息工程专业英语课件4.ppt

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1、Unit 3 Electronic System ComponentsLesson 7 Switching Power SupplyLesson 7 Switching Power Supply BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques12/22/20222电子信息工程专业英语教程Terminology Domino effectBackgrounds12/22/20223电子信息工程专业英语教程Terminology 12/22/20224电子信息工程专业英语教程Do

2、mino effect骨牌效应A cumulative effect produced when one event sets off a chain of similar events:由一件事引发一系列相似事件的累积效应：the domino effect of increasing the speed limit in one of several contiguous states.几个毗邻州中的一个州提高汽车速度极限而引起的骨牌效应12/22/20225电子信息工程专业英语教程Text tour Outline Linear versus Switching Power Suppli

3、esBasic ConvertersForward-Mode Converter FundamentalsBoost-mode Converter FundamentalsTopologies 12/22/20226电子信息工程专业英语教程The linear regulator It operates byonly 30 to 50 percent efficient uneconomical above 10 watts for small applications Switching regulator operates the power devices in the full-on

4、and cutoff states efficiencies of between 70 to 90 percent an attractive choice for output powers greater than 10 watts or where multiple outputs are desired Linear vs.Switching Power Supplies12/22/20227电子信息工程专业英语教程Figure 3.1.Forward-Mode Converter OperationBasic Converters Forward-Mode Converter Fu

5、ndamentals12/22/20228电子信息工程专业英语教程Figure 3.1.Forward-Mode Converter OperationBasic Converters Forward-Mode Converter Fundamentals12/22/20229电子信息工程专业英语教程Figure 3.2.Schematic of a Boost ConverterBasic Converters Boost-mode Converter Fundamentals12/22/202210电子信息工程专业英语教程Figure 3.3.Waveforms for a Boost C

6、onverterBasic Converters Boost-mode Converter Fundamentals12/22/202211电子信息工程专业英语教程A topology is Each topology has its own merits within certain applications.Some of the factors which determine the suitability of a particular topology to a certain application Topologies12/22/202212电子信息工程专业英语教程Vocabul

7、ary load,cutoff,flux,barrier,effect,condition StructureReading/writing techniquesLanguage in use12/22/202213电子信息工程专业英语教程Vocabulary12/22/202214电子信息工程专业英语教程Load in dictionaryA weight or mass that is supported:负重The overall force to which a structure is subjected in supporting a weight or mass or in re

8、sisting externally applied forces.负载量Something that is carried,as by a vehicle,a person,or an animal:装载物The quantity that is or can be carried at one time.装载量The share of work allocated to or required of a person,a machine,a group,or an organization.工作负荷量12/22/202215电子信息工程专业英语教程Load in dictionaryThe

9、 demand for services or performance made on a machine or system.负荷The amount of material that can be inserted into a device or machine at one time:装填量A mental weight or burden:精神负担A responsibility regarded as oppressive.负担The power output of a generator or power plant.发电量12/22/202216电子信息工程专业英语教程Load

10、 in text Historically,the linear regulator was the primary method of creating a regulated output voltage.It operates by reducing a higher input voltage down to the lower output voltage by linearly controlling the conductivity of a series pass power device in response to changes in its load.This resu

11、lts in a large voltage being placed across the pass unit with the load current flowing through it.在历史上，线性稳压器曾是产生稳压输出电压的主要方法。通过对级联功率通过器件导电性线性控制以响应负载变化，线性稳压器将输入高电压降为输出低电压。这种方法导致在负载电流流经的通过单元两端出现一个大电压。12/22/202217电子信息工程专业英语教程Load in use admissible load 容许载重capacitive load 电容性负载circuit load 电路负荷,线路负荷indu

12、ctive load 电感负载ohmic load 电阻负载output load 输出负载safe load 安全载荷unmatched load 不匹配负载12/22/202218电子信息工程专业英语教程Cutoff in dictionaryA designated limit or point of termination.截止期A shortcut or bypass.近路，捷径The act or an instance of cutting off:切断Designating a limit or point of termination:截止的The point of degr

13、adation,due to attenuation or distortion,at which a signal becomes unusable.截止点12/22/202219电子信息工程专业英语教程Cutoff in text The switching regulator operates the power devices in the full-on and cutoff states.This then results in either large currents being passed through the power devices with a low“on vo

14、ltage or no current flowing with high voltage across the device.开关电源中的功率器件工作在全开和截断状态。这样，要么在大电流流经功率器件时，导通电压很低；要么在大电压时，没有电流通过器件。12/22/202220电子信息工程专业英语教程Cutoff in use current-gain cutoff电流增益截止grid-current cutoff栅流截止grid-voltage cutoff栅压截止12/22/202221电子信息工程专业英语教程Flux in dictionaryA flow or flowing.流动A c

15、ontinued flow;a flood.洪流The lines of force of a magnetic field.磁力线Constant or frequent change;fluctuation.变迁；波动：A substance that aids,induces,or otherwise actively participates in fusing or flowing 熔剂A substance applied to a surface to be joined by welding,soldering,or brazing to facilitate the flow

16、ing of solder and prevent formation of oxides.焊剂12/22/202222电子信息工程专业英语教程Flux in textDuring the“on”period,energy is being stored within the core material of the inductor in the form of flux.There is sufficient energy stored to carry the requirements of the load during the next off period.在“接通”周期，能量以磁

17、通的形式存储在电感的铁芯材料中。存储的能量足以满足负载在下一个“断开”周期的需求。12/22/202223电子信息工程专业英语教程Flux in use acidic flux 酸性熔(焊)剂battery flux 蓄电池流出量core flux 铁心通量magnetic flux 磁通量non-oxygen flux 无氧焊剂rosin flux 焊剂scalar flux 标量通量short-circuit flux 短路磁通,短路通量12/22/202224电子信息工程专业英语教程Barrier in dictionaryA structure,such as a fence,buil

18、t to bar passage.栅栏，挡板，壁垒，关卡Something immaterial that obstructs or impedes:妨碍A boundary or limit.界线或限制Something that separates or holds apart.隔离物12/22/202225电子信息工程专业英语教程Barrier in textNon-isolated switching power supplies are typically used for board-level regulation where a dielectric barrier is pr

19、ovided elsewhere within the system.非隔离开关电源的典型应用为具备绝缘隔板的系统提供板级电压调理。12/22/202226电子信息工程专业英语教程Barrier in use air barrier 气密层;内衬层collector barrier 集电极势垒contact(potential)barrier 接触势垒customs barrier 关税壁垒emitter barrier 发射极势垒fire barriers 防火间隔language barrier 语言障碍sonic barrier 音障,声垒water barrier 防水层12/22/2

20、02227电子信息工程专业英语教程Effect in dictionarySomething brought about by a cause or an agent;a result.结果The power to produce an outcome or achieve a result;influence:影响A scientific law,hypothesis,or phenomenon:效应Advantage;avail:利益；效益：The condition of being in full force or execution:生效,实施Something that produ

21、ces a specific impression or supports a general design or intention:感受，效果A particular impression:特殊印象：Production of a desired impression:印象The basic or general meaning;import:主旨；要点：12/22/202228电子信息工程专业英语教程Effect in textThe companies building their own power systems are leaning toward transformer iso

22、lation in as many power supplies as possible since it prevents a domino effect during failure conditions 制造自己系统电源的公司倾向于在尽可能多的电源中采用变压器隔离，因为这种隔离避免了故障出现时将产生的连锁反应。12/22/202229电子信息工程专业英语教程Effect in use effect consequence result outcome An effect is produced by the action of an agent or a cause and follow

23、s it in time:A consequence also follows a cause and is traceable to it,but the relationship between them is less sharply definableA result is an effect,or the last in a series of effects,that is viewed as the end product of the operation of the cause:An outcome is a result but more strongly than res

24、ult implies finality and may suggest the operation of a cause over a relatively long period:12/22/202230电子信息工程专业英语教程Condition in dictionaryA mode or state of being:状态或状况：A state of readiness or physical fitness.生理状况A disease or physical ailment:疾病或身体不适Social position;rank.社会地位；身份One that is indispen

25、sable to the appearance or occurrence of another;prerequisite:先决条件One that restricts or modifies another;a qualification.限定条件12/22/202231电子信息工程专业英语教程Conditions in dictionaryExisting circumstances存在的环境Conditions in the office made concentration impossible.办公室的状况根本不可能使人专心 12/22/202232电子信息工程专业英语教程Condi

26、tion in textA crowbar is a latching SCR which is fired when the output is sensed as entering an overvoltage condition.短路器是一个自锁的半导体可控整流器。当输出进入过电压状态，就会激发这个整流器。12/22/202233电子信息工程专业英语教程Condition in use abnormal operating conditions 不正常的工作情况adverse conditions 不利条件，有害状态housing conditions 居住条件normal running conditions 正常工作运行状态oscillating condition 振荡条件short-circuit condition 短路状态12/22/202234电子信息工程专业英语教程Structure12/22/202235电子信息工程专业英语教程Reading/Writing techniques12/22/202236电子信息工程专业英语教程