4.5復合斬波電路和多相多重斬波電路 Compound chopper circuit and multi-phase multiple chopper circuit中英版

Item4DCChopperCircuit項目四直流斬波電路Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路TeachingResourcesDatabaseof

NationalVocationalEducationPowerSupplyTechnologyBilingualcourses.Powerelectronicstechnology電力電子技術復合斬波電路一一降壓斬波電路和升壓斬波電路的組合構成Compositechoppercircuit-acombinationofbuckchoppercircuitandboosterchoppercircuit多相多重斬波電路一一相同結構的基本斬波電路組合構成Multiphasemultiplechoppercircuit-acombinationofbasicchoppercircuitsofthesamestructureCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路復合斬波電路:電流可逆斬波電路

Compositechoppercircuit:currentreversiblechoppercircuit該電路用于直流電動機拖動，可使電動機電動運行，或發(fā)電制動運行；ThecircuitisusedforDCmotordriving,canmakethemotorelectricoperation,ordynamicbrakingoperation;電機在電動運行或發(fā)電制動運行時，電機轉向不變，即電樞電壓極性不變，僅電樞電流改變方向，故其可工作于第1象限和第2象限；Whenthemotorisinelectricoperationordynamic

brakingoperation,themotorsteeringisunchanged,thatis,thearmaturevoltagepolarityisunchanged,andonlythearmaturecurrentchangesdirection,soitcanworkinthefirstquadrantandthesecondquadrant;電機電動運行時：V1和VD1組成降壓斬波電路，電機工作于第1象限Whenthemotoriselectricoperation:V1andVD1formabuckchoppercircuit,andthemotorworksinquadrant1電機發(fā)電制動時：V2、VD2組成升壓斬波電路；電機工作于第2象限Whenthemotorisdynamicbrakingoperation,V2andVD2constitutetheboosterchoppercircuit;

Themotorworksinquadrant2Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路電流可逆斬波電路的工作過程

Theoperatingprocessofacurrentreversiblechoppercircuit1：V1和VD1構成降壓斬波電路，由電源向直流電動機供電，電動機為電動運行，V1采用PWM控制方式。1:V1andVD1constituteabuckchoppercircuit,whichsuppliespowertotheDCmotorfromthepowersupply.Themotoriselectricoperation,andV1adoptsPWMcontrolmode.2：V2和VD2構成升壓斬波電路，把直流電動機的功能轉變?yōu)殡娔芊答伒诫娫?，使電動機作再生制動運行，工作于第2象限，V2采用PWM控制方式。2:V2andVD2constitutetheboosterchoppercircuit,whichconvertsthefunctionoftheDCmotorintoelectricenergyandfeedsbacktothepowersupply,sothatthemotorrunsforregenerativebrakingandworksinthesecondquadrant.V2adoptsPWMcontrolmode.必須防止，V1和V2同時導通而導致的電源短路YouhavetopreventapowershortcircuitfromV1andV2beingonatthesametime只作降壓斬波器運行時，V2和VD2總處于斷態(tài)whenthebuckchopperisonlyrunning，V2andVD2arealwaysintheoffstate只作升壓斬波器運行時，則V1和VD1總處于斷態(tài)Whenonlytheboosterchopperisrunning,V1andVD1arealwaysintheoffstateCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路3：第三種工作方式：一周期內(nèi)作為降壓斬波電路和升壓斬波電路交替工作Thethirdworkingmode:alternatelyworkasabuckchoppercircuitandboosterchoppercircuitwithinaweek

控制方式：V1和V2均采用PWM控制方式

Controlmode:bothV1andV2adoptPWMcontrolmode二者互補控制，即任何時刻總有一個電力電子器件導通Thetwoarecomplementary,meaningthatonepowerelectronicdeviceisalwaysonatanytime當降壓斬波電路或升壓斬波電路的電流斷續(xù)而為零時，使另一斬波電路工作，讓電流反方向流過，這樣電動機電樞回路總有電流流過。見下圖：Whenthecurrentofthebuckchoppercircuitortheboosterchoppercircuitisdiscontinuousandzero,maketheotherchoppercircuittoworkandthecurrentflowsintheoppositedirection,sothatthearmaturecircuitofthemotoralwayshascurrentflowing.Seeimagebelow:電機電流在一周期內(nèi)沿正、反兩個方向流通，電流不斷，所以晌應很快。Motorcurrentflowsinbothpositiveandoppositedirectionsinacycle,andthecurrentisconstant,sotheresponseisfast.Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路電流可逆斬波電路的工作過程

Theoperatingprocessofacurrentreversiblechoppercircuit多相多重斬波電路

Multiphasemultiplechoppercircuit多相多重斬波電路的組成在電源和負載之間接入多個結構相同的基本斬波電路而構成Apluralityofbasicchoppercircuitswiththesamestructureareconnectedbetweenthepowersupplyandtheload相數(shù)重數(shù)一個控制周期中電源側的電流脈波數(shù)Thenumberofcurrentpulsewavesonthepowersupplysideinacontrolcycle負載電流的脈波數(shù)ThepulsenumberoftheloadcurrentCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路CompositionofmultiphasemultiplechoppercircuitPhasemultiplenumber3相3重降壓斬波電路

3-phasetriplebuckchoppercircuit由3個相同的降壓斬波單元電路并聯(lián)而成；Itiscomposedofthreeidenticalbuckchopperunitcircuitsinparallel.輸出電流為3個斬波電路單元輸出電流之和，其值為單元輸出電流平均值的3倍，脈動頻率也為3倍；Theoutputcurrentisthesumoftheoutputcurrentofthreechoppercircuitunits,anditsvalueis3timestheaveragevalueoftheunitoutputcurrent,andthepulsationfrequencyisalso3times.由于3個單元電流的脈動幅值互相抵消，使總的輸出電流脈動幅值變得很小；Becausethepulsationamplitudesofthethreeunitscanceleachother,thepulsationamplitudesofthetotaloutputcurrentbecomeverysmall.Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復合斬波電路和多相多重斬波電路多相多重斬波電路

Multiphasemultiplechoppercircuit特點

Features：1.輸出電流最大脈動率（電流脈動幅值與電流平均值之比）與相數(shù)的平方成反比Themaximumpulsationrateoftheoutputcurrent(theratioofthecurrentpulsationamplitudetothecurrentmean)isinverselyproportionaltothesquareofthephasenumber2.和單相時相比，當輸出電流最大脈動率相同時，所需平波電抗器總重量大為減輕Comparedwithsingle-phasereactor,whenthemaximumpulsationrateoftheoutputcurrentisthesame,thetotalweightoftheflat-wavereactorisgreatlyreduced3.如上述電路電源共用，而負載為三個獨立，負載為三相一重斬波電路Iftheabovecircuitpowersupplyisshared,andtheloadisthreeindependent,theloadisthree-phaseonechoppercircuit4.如電源為三個獨立電源，向一個負載供電時為一相三重斬波電路Ifthepowersupplyisthreeseparatepowersupplies,spplypowertooneload,thatisone-phasetriplechoppercircuit5.多項多重斬波電路有備用