电流 外文翻译 外文文献 英文文献 整路电流

外文翻译RECTIFICATIONCIRCUITSINGLEPHASE,THREEPHASELEVELINGCIRCUITPRINCIPLEOFWORKANDPROFILEANALYSISMETHODLEVELINGCIRCUITACTIVEINVERSIONACTIVESTATUS1ST,OUTLINEAPPEARSTHEEARLIESTELECTRICPOWERELECTRONICCIRCUIT,BECOMESTHEALTERNATINGCURRENTTHEDIRECTCURRENT2ND,LEVELINGCIRCUITCLASSIFICATIONMAYDIVIDEINTONOTCONTROLLABLYACCORDINGTOTHECOMPOSITIONCOMPONENT,PARTLYCONTROLS,ALLCONTROLSTHREEKINDSMAYDIVIDEINTOTHEBRIDGECIRCUITANDTHEZEROTYPEELECTRICCIRCUITACCORDINGTOTHEELECTRICCIRCUITSTRUCTURECOUNTSACCORDINGTOTHEEXCHANGEINPUTDIVIDESINTOTHESINGLEPHASECIRCUITANDTHEPOLYPHONECIRCUITISUNIDIRECTIONALACCORDINGTOTHETRANSFORMERTWOSIDESELECTRICCURRENTSDIRECTIONORBIDIRECTIONAL,ALSODIVIDESINTOONLYPATSTHEELECTRICCIRCUITANDTHEPAIROFRACKETELECTRICCIRCUITSINGLEPHASECONTROLLABLELEVELINGCIRCUITSINGLEPHASEHALFWAVECONTROLLABLELEVELINGCIRCUIT1ST,BELTRESISTIVELOADWORKINGCONDITIONTRANSFORMERTPLAYSTHETRANSFORMATIONVOLTAGEANDTHEELECTRICALISOLATIONROLE。1CHARACTERISTIC1THEVOLTAGEANDTHEELECTRICCURRENTHAVETHEDIRECTRATIO,TWOPROFILESARESAME2PHASESHIFTINGSCOPE。1803ALONGWITHINCREASING,DUEREDUCES4THECRYSTALHYDRATIONWITHSTANDSMOSTTAISHO,THEREVERSEVOLTAGEARE2UFIRST,INTRODUCESTWOIMPORTANTBASICCONCEPTSTRIGGERSSTARTSFROMTHECRYSTALHYDRATIONTOWITHSTANDTOISEXERTINGTHETRIGGERPULSETOTHEANODEVOLTAGETOSTOP,INDICATEDWITHA,ALSOTHENAMETRIGGERSTHEANGLEORTHECONTROLANGLELEADSPASSESTHEANGLETHECRYSTALHYDRATIONISINPASSINGCONDITIONINAPOWERSOURCECYCLE,WITHTHETAEXPRESSED2BULKRELATIONSTHEDIRECTCURRENTOUTPUTVOLTAGEMEANVALUEISCONTROLSTHEDIRECTCURRENTOUTPUTVOLTAGESIZETHROUGHTHECONTROLTRIGGERPULSEPHASETHEWAYTOBECALLEDTHEPHASECONTROLWAY,THEABBREVIATIONCONTROLSTHEWAY2ND,BELTANTIFEELINGLOADWORKINGCONDITION1ANTIFEELINGLOADCHARACTERISTIC1THEINDUCTANCEHASTHERESISTANCEFUNCTIONTOTHEELECTRICCURRENTCHANGE,CAUSESTOFLOWTHEINDUCTANCEELECTRICCURRENTNOTTOHAVETHESUDDENCHANGE2DUESTARTSTOAPPEARTHENEGATIVEVALUE2AFTERFLOWDIODE1PRINCIPLEOFWORKWHENU2ZEROHASCHANGEDNEGATIVE,VDRLEADSPASSES,DUEISZERO,VTWITHSTANDSTHECOUNTERPRESSURETOSHUTOFFTHELSTORAGEENERGYHADGUARANTEEDELECTRICCURRENTIDCIRCULATESINTHELRVDRRETURNROUTE,THISPROCESSUSUALLYISCALLEDTHEAFTERFLOW2STOICHIOMETRICRELATION2STOICHIOMETRICRELATIONSUBTOTALTHEVTAPHASESHIFTINGSCOPEFOR180,ITSWITHSTANDINGMOSTTAISHO,THEREVERSEVOLTAGEPEAKVALUEISSIMPLE,BUTTHEOUTPUTPULSATIONISBIG,INTHETRANSFORMERTWOSIDESELECTRICCURRENTSCONTAINSTHEDIRECTCOMPONENT,CREATESTHETRANSFORMERCOREDIRECTCURRENTMAGNETIZATIONINFACTVERYLITTLEAPPLIESTHISKINDOFELECTRICCIRCUITANALYZESTHISELECTRICCIRCUITTHEMAINGOALTOESTABLISHTHELEVELINGCIRCUITTHEBASICCONCEPTTHREEPHASEHALFWAVECONTROLLABLELEVELINGCIRCUIT1ST,RESISTIVELOAD1STRUCTUREELECTRICCIRCUITCHARACTERISTICTHETRANSFORMERTWOSIDEJOINTSBECOMETHESTARTYPETOOBTAINTHEZEROCURVE,BUTASIDEJOINTBECOMESTHETRIANGLETOAVOID3FLOWINGINTHEELECTRICALNETWORKTHREECRYSTALSHYDRATIONSSEPARATELYTURNONA,B,THECTHREEPHASEPOWERSOURCE,ITSNEGATIVEPOLECONNECTSINTOGETHERMOONCATHODECONNECTIONNATURESPOTTHEDIODETIMEFORTHENATURESPOT,ISTHEEARLIESTTIMEWHICHEACHCRYSTALHYDRATIONCANTRIGGERLEADSPASSES,TAKESITASCALCULATESVARIOUSCRYSTALSHYDRATIONTOTRIGGERANGLETHEBEGINNING,NAMELYA02PRINCIPLEOFWORKANALYSISTHEA0TRANSFORMERTWOTIMELEANSAANDTHECRYSTALHYDRATIONVT1CURRENTWAVEFORM,THETRANSFORMERTWOWINDINGSELECTRICCURRENTSHASTHEDIRECTCOMPONENTTHECRYSTALHYDRATIONVOLTAGEWAVEFORM,ISCOMPOSEDBY3SECTIONSCHARACTERISTICTHELOADCURRENTISATCONTINUOUSLYANDOFFANDONTHEBETWEENCRITICALSTATECHARACTERISTICTHELOADMAKESANDBREAK,THECRYSTALHYDRATIONLEADSPASSESTHEANGLETOBESMALLERTHAN1203RECTIFICATIONVOLTAGEMEANVALUECOMPUTATIONWHENA30,THELOADCURRENTISCONTINUAL,HAS当A0时，FORWHENA30,THELOADMAKESANDBREAK,THECRYSTALHYDRATIONLEADSPASSESTHEANGLETOREDUCE,THISTIMEHASTHECRYSTALHYDRATIONWITHSTANDSTHEMOSTGREATLYREVERSEVOLTAGE,ISTHETRANSFORMERTWOLINESVOLTAGESPEAKVALUE,NAMELYMAXIMUMFORWARDVOLTAGEBETWEENTHECRYSTALHYDRATIONANODEANDTHENEGATIVEPOLEISEQUALTOTHETRANSFORMERTWOPHASEVOLTAGESTHEPEAKVALUES,NAMELY2ND,ANTIFEELINGLOAD1STRUCTURECHARACTERISTICANTIFEELINGLOAD,LVALUEVERYBIG,THEIDPROFILEBASICISSTRAIGHTA30WHENWHENRECTIFICATIONVOLTAGEWAVEFORMANDRESISTIVELOADISSAMEA30OCLOCKU2ZEROHOUR,VT1HASNOTSHUTOFF,UNTILTHEVT2PULSEARRIVAL,ONLYTHENTRADESTHECLASS,INTHEDUEPROFILEAPPEARSTHENEGATIVEPARTTHEIDPROFILEHASTHECERTAINPULSATION,BUTFORTHESIMPLIFICATIONANALYSISANDTHEQUANTITATIVEEVALUATION,MAYBEAPPROXIMATEIDISALEVELLINETIMETHEANTIFEELINGLOADPHASESHIFTINGSCOPEIS902ND,STOICHIOMETRICRELATIONBECAUSETHELOADCURRENTISCONTINUAL,DUEMAYEXTRACTTRANSFORMERSECONDARYCURRENTNAMELYCRYSTALHYDRATIONMOSTTAISHO,THEREVERSEVOLTAGEPEAKVALUEARETHETRANSFORMERTWOLINESVOLTAGESPEAKVALUETHETHREEPHASEHALFWAVEMAINSHORTCOMINGLIESINITSTRANSFORMERSECONDARYCURRENTTOINCLUDETHEDIRECTCOMPONENT,ARELESSFORTHISITSAPPLICATIONTHETHREEPHASEBRIDGETYPEALLCONTROLSTHELEVELINGCIRCUIT1ST,TIMEBELTRESISTIVELOADWORKINGCONDITION1STRUCTURETHECOMMONCATHODEGROUPDATIVEPOLECONNECTSINTHETOGETHER3CRYSTALSHYDRATIONVT1,VT3,VT5ALTOGETHERTHEANODEGROUPODECONNECTSINTHETOGETHER3CRYSTALSHYDRATIONVT4,VT6,VT2LEADSPASSESTHEORDERVT1VT2VT3VT4VT5VT6WHENA60,THEDUEPROFILECONTINUOUSLY,REGARDINGTHERESISTIVELOAD,THEIDPROFILEANDTHEDUEPROFILESHAPEISSAME,ALSOISCONTINUALA30A60WHENA60,THEDUEPROFILEEACHIN60HASASECTIONISZERO,THEDUEPROFILECANNOTAPPEARTHENEGATIVEVALUEWHENBELTRESISTIVELOADTHETHREEPHASEBRIDGETYPEALLCONTROLSTHELEVELINGCIRCUITAANGLETHEPHASESHIFTINGSCOPEIS120THETHREEPHASEBRIDGETYPEALLCONTROLSTHELEVELINGCIRCUITTHECHARACTERISTIC12SIMULTANEOUSLYTOPASSFORMSTHEPOWERSUPPLYRETURNROUTE,COMMONCATHODEGROUPANDALTOGETHERTHEANODEGROUPEACH1,ALSOCANNOTFORWITH1COMPONENT2TOTRIGGERPULSEREQUESTACCORDINGTOTHEVT1VT2VT3VT4VT5VT6ORDER,THEPHASEMISSES60INTURNCOMMONCATHODEGROUPVT1,VT3,THEVT5PULSEMISSES120INTURN,ALTOGETHERANODEGROUPVT4,VT6,VT2ALSOINTURNMISS120IDENTICALABOUTTWO,NAMELYVT1ANDVT4,VT3ANDVT6,VT5ANDVT2,THEPULSEDIFFERS1803DUECYCLEPULSATION6,THEPULSATIONPROFILEALLISEACHTIMESAME,THEREFORETHISELECTRICCIRCUITIS6PULSEWAVESLEVELINGCIRCUIT4MUSTGUARANTEESIMULTANEOUSLYLEADS2CRYSTALSHYDRATIONSWHICHPASSESTOHAVETHEPULSETOUSETWOMETHODSONEKINDISTHEWIDTHPULSETRIGGERSONEKINDISTHEDOUBLEPULSETRIGGERSWHENTHEVOLTAGEWAVEFORMANDTHETHREEPHASEHALFWAVEWHICHCOMMONLYUSED5THECRYSTALHYDRATIONWITHSTANDSSAME,CRYSTALHYDRATIONWITHSTANDINGMOSTTAISHOTHEREVERSEVOLTAGERELATIONSAREALSOSAMETHECRYSTALHYDRATIONANDTHEOUTPUTRECTIFICATIONVOLTAGESITUATIONLIKETABLESHOWS2ND,TIMEANTIFEELINGLOADWORKINGCONDITIONA60WHENDUEPROFILECONTINUAL,WHENWORKINGCONDITIONANDBELTRESISTIVELOADISEXTREMELYSIMILARVARIOUSCRYSTALSHYDRATIONPASSESBREAKSTHESITUATION,THEOUTPUTRECTIFICATIONVOLTAGEDUEPROFILE,THEVOLTAGEWAVEFORMWHICHTHECRYSTALHYDRATIONWITHSTANDSTHEDIFFERENCELIESINOBTAINSTHELOADCURRENTIDPROFILEISDIFFERENTWHENTHEINDUCTANCEENOUGHISBIG,THEIDPROFILEMAYBEAPPROXIMATEISALEVELLINEWHENA60OCLOCKANTIFEELINGLOADSWORKINGCONDITIONANDRESISTIVELOADISDIFFERENTWHENRESISTIVELOAD,THEDUEPROFILECANNOTAPPEARTHENEGATIVEPARTWHENANTIFEELINGLOAD,THEDUEPROFILECANAPPEARTHENEGATIVEPARTWHENBRINGSTHEANTIFEELINGLOAD,THETHREEPHASEBRIDGETYPEALLCONTROLSTHELEVELINGCIRCUITAANGLEPHASESHIFTINGSCOPEIS903RD,QUANTITATIVEANALYSISWHENRECTIFIEDOUTPUTVOLTAGECONTINUOUSLYWHENNAMELYBELTANTIFEELINGLOAD,ORBELTRESISTIVELOADA60WHENAVERAGEBELTRESISTIVELOADALSOA60OCLOCK,THERECTIFICATIONVOLTAGEMEANVALUEISTHEOUTPUTCURRENTMEANVALUEISIDDUE/RWHENTHERECTIFICATIONTRANSFORMERUSESTHESTARCONNECTION,WHENBRINGSTHEANTIFEELINGLOAD,THETRANSFORMERTWOSIDESELECTRICCURRENTS,ITSARECRYSTALHYDRATIONVOLTAGE,ELECTRICCURRENTANDSOONQUANTITATIVEANALYSISWITHTHREEPHASEHALFWAVEWHENISCONSISTENTWHENMEETSTHECOUNTERELECTROMOTIVEFORCEANTIFEELINGLOAD,WHENLOADCURRENTCONTINUALSITUATION,ELECTRICCIRCUITWORKINGCONDITIONANDINDUCTIVELOADISSIMILAR,INELECTRICCIRCUITEACHPLACEVOLTAGE,CURRENTWAVEFORMHOMOGENEOUSPHASEWITHINTHEFORMULARANDERESPECTIVELYAREINTHELOADRESISTANCEVALUEANDTHECOUNTERELECTROMOTIVEFORCEVALUE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。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018（3）调节角即可控制的大小DU（4）晶闸管承受的最大反向电压为2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2URVDDI回路中流通，此过程通常称为续流。RL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03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0当时，最大，为0DU2017UD时，负载电流断续，晶闸管导通角减小，此时有3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DI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03均连续。时，当U2过零时，由于电感的存在，阻止电流下降，因而继续导通，031VT直到下一相晶闸管的触发脉冲到来，才发生换流，由导通向负载供电，2VT2同时向施加反向电压使其关断。这种情况下波形中出现负的部分，如1DU增大，波形中负的部分增多，至时，波形的正负面积相等，DU09的平均值为零。可见阻感负载时的移相范围是。D0等量关系由于负载电流连续，既晶闸管阳极与阴极间的最大正向电压等于变压器二次相电压的峰值。三相半波可控整