Lesson09DiodeBridge电子技术专业英语教程

1、Lesson 9 Diode Bridge 电子技术专业英语教程冯新宇 主编 电子工业出版社 ,Unit 4 Power,2020/11/13,电子技术专业英语教程,2,Lesson 9 Diode Bridge,Backgrounds Text tour Language in use Vocabulary Structure Reading/writing techniques,2020/11/13,电子技术专业英语教程,3,Terminology rectifier Half-wave rectification Full-wave rectification,Backgrounds,2

2、020/11/13,电子技术专业英语教程,4,Terminology,2020/11/13,电子技术专业英语教程,5,bridge rectifier 桥式整流器 full-wave rectification 全波整流 alternating current 交流 direct current 直流 two-wire 两线 center-tapped transformer 中心抽头型变压器,2020/11/13,电子技术专业英语教程,6,reservoir capacitor 充电电容器 smoothing capacitor 平滑电容器 current through 直通电流 resi

3、stive load 电阻负载 bleeder resistor泄漏电阻 ripple cycle 波形周期 series resistor 串联电阻,2020/11/13,电子技术专业英语教程,7,rectifier,A rectifier is an electrical device that converts alternating current (AC) to direct current (DC), a process known as rectification. 整流器是一个把交流转换成直流的电子器件，这个转换过程就是我们熟知的整流。,2020/11/13,电子技术专业英语教

4、程,8,Half-wave rectification,In half wave rectification, either the positive or negative half of the AC wave is passed, while the other half is blocked. Because only one half of the input waveform reaches the output, it is very inefficient if used for power transfer. 在半波整流中，无论是交流的正极输入还是负极输入，半个波形去掉了。因

5、为输入波形只有半个波形出现在输出端，在变压器中效率是很低的。,2020/11/13,电子技术专业英语教程,9,Half-wave rectification,The output DC voltage of a half wave rectifier can be calculated with the following two ideal equations.,2020/11/13,电子技术专业英语教程,10,Full-wave rectification,Full-wave rectification converts both polarities of the input wavef

6、orm to DC (direct current), and is more efficient. However, in a circuit with a non-center tapped transformer, four diodes are required instead of the one needed for half-wave rectification. Four rectifiers arranged this way are called a diode bridge or bridge rectifier 全波整流把输出的两个极性转换成直流，这样更有效。然而在一个

7、没有中心抽头变压器的电路中，四个二极管相当于半波整流中的一个。这种四个整流器的配置我们称为二极管桥或是桥式整流器。,2020/11/13,电子技术专业英语教程,11,Outline Brief introduction (para.1-2) Basic operation (para. 3-9 ) Output smoothing(para.10-11),Text tour,2020/11/13,电子技术专业英语教程,12,Basic operation,when the input connected to the left corner of the diamond is positive

8、, and the input connected to the right corner is negative, current flows from the upper supply terminal to the right along the red (positive) path to the output, and returns to the lower supply terminal via the blue (negative) path.,2020/11/13,电子技术专业英语教程,13,Basic operation,连接到左角的输入是正极，连接到右角的输入是负极，电流

9、从右侧电势较高的电源沿红色（正极）路径流到输出端，通过蓝色（负极）路径回到低电势处。,2020/11/13,电子技术专业英语教程,14,Basic operation,When the input connected to the left corner is negative, and the input connected to the right corner is positive, current flows from the lower supply terminal to the right along the red path to the output, and return

10、s to the upper supply terminal via the blue path.,2020/11/13,电子技术专业英语教程,15,Basic operation,连接到左角的输入是负极，连接到右角的输入是正极，电流从右侧电势较低的电源沿红色路径流到输出端，通过蓝色路径回到高电势处。,2020/11/13,电子技术专业英语教程,16,The function of this capacitor, known as a reservoir capacitor (or smoothing capacitor) is to lessen the variation in (or s

11、mooth) the rectified AC output voltage waveform from the bridge. One explanation of smoothing is that the capacitor provides a low impedance path to the AC component of the output, reducing the AC voltage across, and AC current through, the resistive load.,Output smoothing,2020/11/13,电子技术专业英语教程,17,O

12、utput smoothing,充电电容器（或滤波电容器）的电容功能，减少（或滤波）从桥式结构中输出电压波形的变化。对“滤波”的一种解释是电容对输出AC元件提供了低阻抗路径，减小了电阻负载上通过的交流电压和交流电流。,2020/11/13,电子技术专业英语教程,18,Output smoothing,Because a bleeder sets a minimum current drain, the regulation of the circuit, defined as percentage voltage change from minimum to maximum load, is

13、improved. 由于分压器设置了最小漏电流，电路的调整定义成最小负载到最大负载电压变化的百分比。,2020/11/13,电子技术专业英语教程,19,Output smoothing,The capacitor and the load resistance have a typical time constant = RC where C and R are the capacitance and load resistance respectively. As long as the load resistor is large enough so that this time cons

14、tant is much longer than the time of one ripple cycle . 电容和负载电阻有一个典型的时间常数 = RC，其中C和R分别是电容和负载电阻。只要负载电阻足够大，就可以使这一时间常数远大于一个纹波周期 。,2020/11/13,电子技术专业英语教程,20,In some designs, a series resistor at the load side of the capacitor is added. 在某些设计中，可以在电容一侧的负载端增加一个串联电阻。,Output smoothing,2020/11/13,电子技术专业英语教程,21

15、,In a practical circuit, when a capacitor is directly connected to the output of a bridge, the bridge diodes must be sized to withstand the current surge that occurs when the power is turned on at the peak of the AC voltage and the capacitor is fully discharged . 在实际电路中，当一个电容器直接连接到桥式整流器的输出端时，桥式结构中的二

16、极管必须能够承受交流电压峰值时开启电源和电容完全放电所产生的电流浪涌。,Output smoothing,2020/11/13,电子技术专业英语教程,22,Vocabulary conversion ， essential ， originally， reservoir ， dangerous，irrelevant ， lessen Structure,Language in use,2020/11/13,电子技术专业英语教程,23,Vocabulary,2020/11/13,电子技术专业英语教程,24,when you change something from one form, purp

17、ose, or system to a different one when someone changes from one religion or belief to a different one,conversion in dictionary,2020/11/13,电子技术专业英语教程,25,conversion in text,When used in its most common application, for conversion of alternating current (AC) input into direct current (DC) output, it is

18、 known as a bridge rectifier. 在大多数常规应用中，把交流（AC）输入转换成直流（DC）输出，这就是熟知的桥式整流器。,2020/11/13,电子技术专业英语教程,26,direct frequency conversion circuit直接变频电路 indirect frequency conversion circuit间接变频电路 conversion applications格式转换,conversion in use,2020/11/13,电子技术专业英语教程,27,adj 1.extremely important and necessary; 2.t

19、he essential part, quality, or feature of something is the most basic one; n 1.that is necessary to do something or in a particular situation ; 2.the basic and most important information or facts about a particular subject ;,essential in dictionary,2020/11/13,电子技术专业英语教程,28,essential in text,The esse

20、ntial feature of a diode bridge is that the polarity of the output is the same regardless of the polarity at the input. 桥式整流器的基本特点是输出极性与输入极性完全相同。,2020/11/13,电子技术专业英语教程,29,essential condition 必要条件 essential values 核心价值观 essential platform 要素平台 minimum essential 最基本 most essential 最基本 essential substa

21、nce 主要物质 essential viewpoint 根本看法,essential in use,2020/11/13,电子技术专业英语教程,30,in the beginning, before other things happened or before things changed 本来, 原来; 最初 独创地, 独出心裁地; 新颖地,originally in dictionary,2020/11/13,电子技术专业英语教程,31,According to the conventional model of current flow originally established

22、by Benjamin Franklin and still followed by most engineers today, current is assumed to flow through electrical conductors from the positive to the negative pole. 今天大多数工程师仍然沿袭使用着最初由本杰明富兰克林建立的传统电流模型，假设电流从导体的正极流向负极。,originally in text,2020/11/13,电子技术专业英语教程,32,thinking originally 原发性思维 originally belong

23、s 原本属于 originally designed 原设计,originally in use,2020/11/13,电子技术专业英语教程,33,a lake, especially an artificial one, where water is stored before it is supplied to peoples houses a large amount of something that is available and has not yet been used a part of a machine or engine where a liquid is kept b

24、efore it is used,reservoir in dictionary,2020/11/13,电子技术专业英语教程,34,The function of this capacitor, known as a reservoir capacitor (or smoothing capacitor) is to lessen the variation in (or smooth) the rectified AC output voltage waveform from the bridge. 充电电容器（或滤波电容器）的电容功能，减少（或滤波）从桥式结构中输出电压波形的变化。,res

25、ervoir in text,2020/11/13,电子技术专业英语教程,35,exhaust reservoir 排气储筒 surface reservoir 地面水库,reservoir in use,2020/11/13,电子技术专业英语教程,36,able or likely to harm or kill you involving a lot of risk, or likely to cause problems a situation or subject that could make someone very angry or upset,dangerous in dict

26、ionary,2020/11/13,电子技术专业英语教程,37,The simplified circuit shown has a well-deserved reputation for being dangerous, because, in some applications, the capacitor can retain a lethal charge after the AC power source is removed. 当存在危险时简化电路显示出良好的特性，因为某些应用中，电容器在交流电源被移走后仍可以保留致命的电荷。,dangerous in text,2020/11/

27、13,电子技术专业英语教程,38,dangerous in text,If supplying a dangerous voltage, a practical circuit should include a reliable way to safely discharge the capacitor. 如果出现危险电压，实际电路应包含一个安全可靠的方式使电容放电。,2020/11/13,电子技术专业英语教程,39,dangerous factors 危险因素 dangerous goods 危险货物 dangerous objective 危险目标,dangerous in use,202

28、0/11/13,电子技术专业英语教程,40,not useful or not relating to a particular situation, and therefore not important,irrelevant in dictionary,2020/11/13,电子技术专业英语教程,41,In the vast majority of applications, however, the actual direction of current flow is irrelevant. 然而在绝大多数应用中，电流的真实流动方向是无关紧要的。,irrelevant in text,

29、2020/11/13,电子技术专业英语教程,42,irrelevant variable 无关变量 irrelevant substance不相关物质,irrelevant in use,2020/11/13,电子技术专业英语教程,43,to become smaller in size, importance, or value, or make something do this lessen the risk/chance/possibility etc (of something) lessen the impact/effect/importance (of something),l

30、essen in dictionary,2020/11/13,电子技术专业英语教程,44,The function of this capacitor, known as a reservoir capacitor (or smoothing capacitor) is to lessen the variation in (or smooth) the rectified AC output voltage waveform from the bridge. 充电电容器（或滤波电容器）的电容功能，减少（或滤波）从桥式结构中输出电压波形的变化。,lessen in text,2020/11/1

31、3,电子技术专业英语教程,45,lessen burden 减负 lessen control 放松管制 lessen requirement 减少需求,lessen in use,2020/11/13,电子技术专业英语教程,46,Structure,2020/11/13,电子技术专业英语教程,47,When the input connected to the left corner is negative, and the input connected to the right corner is positive, current flows from the lower supply

32、 terminal to the right along the red path to the output, and returns to the upper supply terminal via the blue path. 如果连接到左角的输入是负极，连接到右角的输入是正极，电流从右侧的电势较低的电源沿红色路径流出到输出端，通过蓝色路径回到高电势处。 这个句子的框架结构是current flows fromto，and returns to.”When the input,and the input” 引导时间状语从句。在主句中，current是主语，flows和returns to

33、是谓语，fromto是状语。,2020/11/13,电子技术专业英语教程,48,In a practical circuit, when a capacitor is directly connected to the output of a bridge, the bridge diodes must be sized to withstand the current surge that occurs when the power is turned on at the peak of the AC voltage and the capacitor is fully discharged. 在实际电路中，当一个电容器直接连接到桥式整流器的输出端时，电源在交流电压峰值的情况开启或是电容完全放电，桥式结构中的二极管必须能够承受一定的电流浪涌。 这个句子的框架结构是the bridge diodes must be sized to withstand the curre