电子信息工程专业英语课件4.ppt

1、Unit 3 Electronic System Components,Lesson 7 Switching Power Supply,2020年10月11日,电子信息工程专业英语教程,2,Lesson 7 Switching Power Supply,Backgrounds Text tour Language in use Vocabulary Structure Reading/writing techniques,2020年10月11日,电子信息工程专业英语教程,3,Terminology Domino effect,Backgrounds,2020年10月11日,电子信息工程专业英语

2、教程,4,Terminology,2020年10月11日,电子信息工程专业英语教程,5,Domino 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,2020年10月11日,电子信息工程专业英语教程,

3、6,Text tour,Outline Linear versus Switching Power Supplies Basic Converters Forward-Mode Converter Fundamentals Boost-mode Converter Fundamentals Topologies,2020年10月11日,电子信息工程专业英语教程,7,The linear regulator It operates by only 30 to 50 percent efficient uneconomical above 10 watts for small applicatio

4、ns Switching regulator operates the power devices in the full-on 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 Supplies,2020年10月11日,电子信息工程专业英语教程,8,Figure 3.1. Fo

5、rward-Mode Converter Operation,Basic Converters Forward-Mode Converter Fundamentals,2020年10月11日,电子信息工程专业英语教程,9,Figure 3.1. Forward-Mode Converter Operation,Basic Converters Forward-Mode Converter Fundamentals,2020年10月11日,电子信息工程专业英语教程,10,Figure 3.2. Schematic of a Boost Converter,Basic Converters Boo

6、st-mode Converter Fundamentals,2020年10月11日,电子信息工程专业英语教程,11,Figure 3.3. Waveforms for a Boost Converter,Basic Converters Boost-mode Converter Fundamentals,2020年10月11日,电子信息工程专业英语教程,12,A topology is Each topology has its own merits within certain applications. Some of the factors which determine the su

7、itability of a particular topology to a certain application ,Topologies,2020年10月11日,电子信息工程专业英语教程,13,Vocabulary load , cutoff, flux, barrier, effect, condition Structure Reading/writing techniques,Language in use,2020年10月11日,电子信息工程专业英语教程,14,Vocabulary,2020年10月11日,电子信息工程专业英语教程,15,Load in dictionary,A

8、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 resisting 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 s

9、hare of work allocated to or required of a person, a machine, a group, or an organization. 工作负荷量,2020年10月11日,电子信息工程专业英语教程,16,Load in dictionary,The 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

10、 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,2020年10月11日,电子信息工程专业英语教程,17,Load in text,Historically, the linear regulator was the primary method of creating a regulated output voltage. It operates by reducing a higher

11、 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 results 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

12、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。,2020年10月11日,电子信息工程专业英语教程,18,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 inductive 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,2020年10月11日,电子信息工程专业英语教程,19,Cutoff in dic

13、tionary,A 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 degradation, due to attenuation or distortion, at which a signal becomes unusable. 截止点,2020年10月11日,电子信息工程专业英语教程,

14、20,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 voltage 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

15、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。,2020年10月11日,电子信息工程专业英语教程,21,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,2020年10月11日,电子信息工程专业英语教程,22,Flux in dictionary,A flow or flowing. 流动 A continued flow; a flood. 洪流 The lines of force of a magnetic field. 磁力线 Constant

16、 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 flowing of solder and prevent formation of oxides. 焊剂,2020年10月11日,电子信息

17、工程专业英语教程,23,Flux in text,During 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。,2020年10月11日,

18、电子信息工程专业英语教程,24,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,2020年10月11日,电子信息工程专业英语教程,25,Barrier in dictionary,A structure, such as a fence, built to bar passage. 栅栏，挡板，壁垒，关卡 Som

19、ething 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,2020年10月11日,电子信息工程专业英语教程,26,Barrier in text,Non-isolated switching power supplies are typically used for board-level regulation where a dielectric barrier is provided elsewhere wit

20、hin 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。,2020年10月11日,电子信息工程专业英语教程,27,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,2020年10月

21、11日,电子信息工程专业英语教程,28,Effect in dictionary,Something 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 S

22、omething that produces 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：,2020年10月11日,电子信息工程专业英语教程,29,Effect in text,The companies building their own power systems a

23、re leaning toward transformer isolation 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。,2020年10月11日,电子信息工程专业英语教程,30,Effect in use,effect consequence result outcome An effect is produced by the ac

24、tion of an agent or a cause and follows it in time: A consequence also follows a cause and is traceable to it, but the relationship between them is less sharply definable A 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 ou

25、tcome is a result but more strongly than result implies finality and may suggest the operation of a cause over a relatively long period:,2020年10月11日,电子信息工程专业英语教程,31,Condition in dictionary,A 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;