电流外文翻译外文文献英文文献整路电流

1、外文翻译rectification circuit single-phase, three-phase leveling circuit principle of work and profile analysis method leveling circuit active inversion active status1st, outline: appears the earliest electric power electronic circuit, becomes the alternating current the direct current.2nd, leveling cir

2、cuit classification:may divide into not controllably according to the composition component, partly controls, all controls three kinds.may divide into the bridge circuit and the zero type electric circuit according to the electric circuit structure.counts according to the exchange input divides into

3、 the single-phase circuit and the polyphone circuit.is unidirectional according to the transformer two sides electric currents direction or bidirectional, also divides into only pats the electric circuit and the pair of racket electric circuit.single-phase controllable leveling circuitsingle-phase h

4、alf-wave controllable leveling circuit1st, belt resistive load working conditiontransformer t plays the transformation voltage and the electrical isolation role。1) characteristic:(1) the voltage and the electric current have the direct ratio, two profiles are same.(2) phase shifting scope: 。(3) alon

5、g with increasing, due reduces.(4) the crystal hydration withstands most taisho, the reverse voltage are first, introduces two important basic concepts:triggers : starts from the crystal hydration to withstand to is exerting the trigger pulse to the anode voltage to stop , indicated with a, also the

6、 name triggers the angle or the control angle.leads passes the angle: the crystal hydration is in passing condition in a power source cycle , with theta expressed.2) bulk relationsthe direct-current output voltage mean value iscontrols the direct-current output voltage size through the control trigg

7、er pulse phase the way to be called the phase control way, the abbreviation controls the way.2nd, belt anti- feeling load working condition1) anti- feeling load characteristic:(1) the inductance has the resistance function to the electric current change, causes to flow the inductance electric curren

8、t not to have the sudden change. (2) due starts to appear the negative value.2) after flow diode(1) principle of workwhen u2 zero has changed negative, vdr leads passes, due is zero, vt withstands the counter- pressure to shut off. the l storage energy had guaranteed electric current id circulates i

9、n the l-r-vdr return route, this process usually is called the after flow.(2) stoichiometric relation(2) stoichiometric relation subtotal: the vt a phase shifting scope for 180°, its withstanding most taisho, the reverse voltage peak value is. simple, but the output pulsation is big, in the tra

10、nsformer two sides electric currents contains the direct component, creates the transformer core direct current magnetization. in fact very little applies this kind of electric circuit. analyzes this electric circuit the main goal to establish the leveling circuit the basic conceptthree-phase half-w

11、ave controllable leveling circuit1st, resistive load1) structureelectric circuit characteristic:the transformer two side joints become the star type to obtain the zero curve, but a side joint becomes the triangle to avoid 3 flowing in the electrical network. three crystals hydrations separately turn

12、 on a, b, the c three-phase power source, its negative pole connects in together -moon cathode connectionnature spot:the diode time for the nature spot, is the earliest time which each crystal hydration can trigger leads passes, takes it as calculates various crystals hydration to trigger angle the

13、beginning, namely a =0°2) principle of work analysisthe a =0° transformer two time leans a and the crystal hydration vt1 current waveform, the transformer two windings electric currents has the direct component. the crystal hydration voltage waveform, is composed by 3 sectionscharacteristi

14、c: the load current is at continuously and off and on the between critical state.characteristic: the load makes and break, the crystal hydration leads passes the angle to be smaller than 120°.3) rectification voltage mean value computationwhen a <= 30°, the load current is continual, ha

15、s:当a=0时，for when a 30°, the load makes and break, the crystal hydration leads passes the angle to reduce, this time hasthe crystal hydration withstands the most greatly reverse voltage, is the transformer two lines voltages peak value, namelymaximum forward voltage between the crystal hydration

16、 anode and the negative pole is equal to the transformer two phase voltages the peak values, namely2nd, anti- feeling load1) structurecharacteristic: anti- feeling load, l value very big, the id profile basic is straight. a <= 30° when: when rectification voltage waveform and resistive load

17、is same.a 30 o'clock u2 zero hour, vt1 has not shut off, until the vt2 pulse arrival, only then trades the class, in the -due profile appears the negative part. the id profile has the certain pulsation, but for the simplification analysis and the quantitative evaluation, may be approximate id is

18、 a level line. time the anti- feeling load phase shifting scope is 90.2nd, stoichiometric relationbecause the load current is continual, due may extracttransformer secondary current namelycrystal hydration most taisho, the reverse voltage peak value are the transformer two lines voltages peak valuet

19、he three-phase half-wave main shortcoming lies in its transformer secondary current to include the direct component, are less for this its application.the three-phase bridge type all controls the leveling circuit1st, time belt resistive load working condition1) structurethe common cathode group -dat

20、ive pole connects in the together 3 crystals hydration (vt1, vt3, vt5) altogether the anode group -ode connects in the together 3 crystals hydration (vt4, vt6, vt2) leads passes the order: vt1 - vt2 - vt3 - vt4 - vt5 - vt6when a <= 60, the due profile continuously, regarding the resistive load, t

21、he id profile and the due profile shape is same, also is continual a =30 a =60 when a 60, the due profile each in 60 has a section is zero, the due profile cannot appear the negative value when belt resistive load the three-phase bridge type all controls the leveling circuit a angle the phase shifti

22、ng scope is 120the three-phase bridge type all controls the leveling circuit the characteristic (1) 2 simultaneously to pass forms the power supply return route, common cathode group and altogether the anode group each 1, also cannot for with 1 component. (2) to trigger pulse request:according to th

23、e vt1-vt2-vt3-vt4-vt5-vt6 order, the phase misses 60 in turn. common cathode group vt1, vt3, the vt5 pulse misses 120 in turn, altogether anode group vt4, vt6, vt2 also in turn miss 120. identical about two, namely vt1 and vt4, vt3 and vt6, vt5 and vt2, the pulse differs 180. (3) due cycle pulsation

24、 6, the pulsation profile all is each time same, therefore this electric circuit is 6 pulse waves leveling circuit. (4) must guarantee simultaneously leads 2 crystals hydrations which passes to have the pulse to use two methods: one kind is the width pulse triggers one kind is the double pulse trigg

25、ers when the voltage waveform and the three-phase half-wave which (commonly used) (5) the crystal hydration withstands same, crystal hydration withstanding most taisho; the reverse voltage relations are also same.the crystal hydration and the output rectification voltage situation like table shows2n

26、d, time anti- feeling load working conditiona <= 60° when due profile continual, when working condition and belt resistive load is extremely similar. various crystals hydration passes breaks the situation, the output rectification voltage due profile, the voltage waveform which the crystal h

27、ydration withstands. the difference lies in: obtains the load current id profile is different. when the inductance enough is big, the id profile may be approximate is a level line.when a 60 o'clock anti- feeling loads working condition and resistive load is different. when resistive load, the du

28、e profile cannot appear the negative part. when anti- feeling load, the due profile can appear the negative part. when brings the anti- feeling load, the three-phase bridge type all controls the leveling circuit a angle phase shifting scope is 90.3rd, quantitative analysiswhen rectified output volta

29、ge continuously (when namely belt anti- feeling load, or belt resistive load a <= 60° when) averagebelt resistive load also a 60 o'clock, the rectification voltage mean value is:the output current mean value is: id=due /r when the rectification transformer uses the star connection, when

30、brings the anti- feeling load, the transformer two sides electric currents, its are:crystal hydration voltage, electric current and so on quantitative analysis with three-phase half-wave when is consistent. when meets the counter electromotive force anti- feeling load, when load current continual si

31、tuation, electric circuit working condition and inductive load is similar, in electric circuit each place voltage, current waveform homogeneous phase within the formula r and e respectively are in the load resistance value and the counter electromotive force value.整流电路 概述整流电路是电力电子中出现最早的一种，它将交流电变为直流电

32、。1. 整流电路的分类根据组成器件可分为不可控、半控，全控三种；按电路结构可以分为桥式电路和零式电路；按交流输入相数可分为单相电路和多相电路；按变压器二次侧电流的方向是单向或双向，又可分为单拍电路和双拍电路。单相可控整流电路单相半波可控整流电路1）特点1 带电阻负载的工作情况 （1）变压器t起变换电压和隔离的作用 （2）该电路中的vt的移相范围为 （3）调节角即可控制的大小 （4）晶闸管承受的最大反向电压为 首先介绍两个基本概念触发：从晶闸管开始承受正阳极电压起到施加触发脉冲止称为触发延迟角，也称为触发角或延迟角。导通角：晶闸管在一个电源周期中处于导通的电角度称为导通角，用希腊语的第八个字母表

33、示。2）重要关系直流输出电压平均值为2 带阻感负载的工作情况 单相半波可控整流电路及波形这种通过控制触发脉冲的相位来控制直流输出电压大小的方式称为相位控制方式，简称相控方式。1） 阻感负载的负荷特性带阻感负载的单相半波可控整流电路波形（1）电感对电流变化有抗拒作用，这也是电流不突然变化的原因。（2）电力电子电路是非线性电路。2）续流二极管 单相半波带阻感负载与续流二极管的电路及波形（1） 工作方式当过零变负时，向vt施加反压使其关断，l储存的能量保证了电流在回路中流通，此过程通常称为续流。单相半波可控整流电路的特点是简单，但输出脉动大，变压器二次侧电流中含直流分量，造成变压器铁心直流磁化。为使

34、变压器铁心不饱和，需增大铁心面积，增大了设备容量。实际上很少用这种电路。分析该电路的目的主要是在于利用其简单易学的特点，建立起可控整流电路的基本概念。三相可控整流电路三相可控整流电路的介绍当整流负载容量较大，或要求直流电压脉冲较小时，应采用三相整流电路，其直流侧由三相电源供电。三相可控整流电路中最基本的是三相半波可控整流电路，应用最为广泛的是三相桥式全控整流电路。三相半波可控整流电路第一 电阻负载1）电路结构三相桥式全控整流电路原理图 三相桥式全控整流电路带电阻负载时的波形电路特性为得到零线，变压器二次侧必须接成星形，而一次侧接成三角形，避免三次谐波流入电网。三个晶闸管分别接入a、b、c三相电源，它们的阴极连接在了一起，称为共阴极接法，这种接法触发电路有公共端，连线方便。自然换向点自然换向点是各相晶闸管能触发导通的最早时刻，将其作为计算各晶闸管触发角的起点，即当时， 最大，为时，负载电流断续，晶闸管导通角减小，此时有由晶闸管承受的最大反向电压不难看出变压器二次侧线电压的峰值，即晶闸管阳极与阴极间的最大反向电压等于变压器二次相电压的峰值，即2） 阻感负载电路结构如果负载为阻感负载，且l值很大，整流电流的波形基本是平直的，流过晶闸管的电流接近矩形波。时，整流电压波形与电阻负载时相同，因为两种负载情况下，负载电流均连续。时，当u2过零时，由于电感的存在，阻止电流下降，