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1、2020/9/18,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,2020/9/18,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,2020/9/18,电子技术专业英语教程,3,Terminology rectifier Half-wave rectification Full-wave rectif
2、ication,Backgrounds,2020/9/18,电子技术专业英语教程,4,Terminology,2020/9/18,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,2020/9/18,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
3、 through 直通电流 resistive load 电阻负载 bleeder resistor泄漏电阻 ripple cycle 波形周期 series resistor 串联电阻,2020/9/18,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。,202
4、0/9/18,电子技术专业英语教程,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
5、还是负极输入，半个波形去掉了。因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。,2020/9/18,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.,2020/9/18,电子技术专业英语教程,10,Full-wave rectification,Full-wave rectification converts both polarities of t
6、he input waveform 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
7、直流，这样更有效。然而在一个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。,2020/9/18,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,2020/9/18,电子技术专业英语教程,12,Basic operation,when the input connected to the left corner of the diamond
8、 is positive, 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.,2020/9/18,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
9、右角的输入是负极，电流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。,2020/9/18,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,
10、and returns to the upper supply terminal via the blue path.,2020/9/18,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。,2020/9/18,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
11、in (or smooth) 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,2020/9/18,电子技术专业英语
12、教程,17,Output 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。,2020/9/18,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 loa
13、d, is 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。,2020/9/18,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
14、 constant 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 。,2020/9/18,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,2020/9/18,电子技术专业英语教程
15、,21,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
16、中的二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,2020/9/18,电子技术专业英语教程,22,Vocabulary conversion ， essential ， originally， reservoir ， dangerous，irrelevant ， lessen Structure,Language in use,2020/9/18,电子技术专业英语教程,23,Vocabulary,2020/9/18,电子技术专业英语教程,24,when you change something from one form, purpose, or system to a different one when someone changes from one religion or belief to a different one,conversion in dictionary,2020/9/18,电子技术专业英语教程,25,conversion in text,When used i
