电子类专业英语电子教案第二课.ppt

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电子类专业英语电子教案第二课

2 Power Supplies 学习重点: (1)掌握有关电源的基本单词、词组和缩略语的基本含义及用法 (2)培养阅读翻译有关电源科技文献和产品说明书的能力 (3)学习科技英语中的名词化结构,掌握由动词、形容词、过去分词、动名词等派生或转化来的抽象名词 生词 bypass [ bai.pɑ:s ] n. 支路,道 coil [ k?il ] n. 卷,线圈 discharge [ dis‘t?ɑ:d? ] v. n. 放电 filter [ ‘filt? ] n. 滤波器,过滤器 v. 过滤 heatsink [ hi:t si?k ] n. 散热器 magnetic [ m?gnetik ] a. 磁的 mains [ mein ] n. 电网 outlet [‘autlet] n. 电源插座 passive [ p?siv ] a. 被动的, 消极的;无源的 pulsating [ p?ls?ti?]a. 脉动的 rated [ reitid ] a. 标称的 ripple [ ‘ripl ] n. 纹波 sample [ s?mpl]n. 样品;标本v. 抽取样品 smooth [ smu:e ]?a. 平稳的,流畅的 v. 使...光滑,滤波 transformer [tr?nsf?:m?(r), trɑ:- ] n. 变压器 bridge rectifier 桥式整流器 magnetic field .磁场 overheating 过热 Pulse Width Modulated (PWM) Regulator 脉冲宽调制调节器 Pulse Rate Modulated (PRM) Regulator 脉冲速率调节器 RMS (=Root-Mean-Square) 均方根 2. 课文翻译讲解 When working with electronics, you always need power supply, a device that transfers electric power from a source to a load using electronic circuits. A typical application of power supplies is to convert utilitys AC input power into regulated DC voltage(s) required for electronic equipment. Depending on the mode of operation of power semiconductors power supply can be linear or switching. Linear voltage power supplies are commonly used for both step-up (output supply voltage is greater than input source voltage) and step-down (output supply voltage is lower than input source voltage) applications. Linear power supplies are also available with either a fixed output voltage or a variable output voltage when using external biasing. Transformer converts the voltage from the wall outlet (mains) to a different, usually a lower voltage. The input coil is called the primary and the output coil is called the secondary. There is no electrical connection between the two coils; instead they are linked by an alternating magnetic field created in the soft-iron core of the transformer. Bridge rectifiers are rated by the passed maximum current and the maximum reverse voltage they can withstand (this must be at least three tim

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