Item4DCChopperCircuit項(xiàng)目四直流斬波電路Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐稵eachingResourcesDatabaseof

NationalVocationalEducationPowerSupplyTechnologyBilingualcourses.Powerelectronicstechnology電力電子技術(shù)復(fù)合斬波電路一一降壓斬波電路和升壓斬波電路的組合構(gòu)成Compositechoppercircuit-acombinationofbuckchoppercircuitandboosterchoppercircuit多相多重?cái)夭娐芬灰幌嗤Y(jié)構(gòu)的基本斬波電路組合構(gòu)成Multiphasemultiplechoppercircuit-acombinationofbasicchoppercircuitsofthesamestructureCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐窂?fù)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(jī)拖動，可使電動機(jī)電動運(yùn)行，或發(fā)電制動運(yùn)行；ThecircuitisusedforDCmotordriving,canmakethemotorelectricoperation,ordynamicbrakingoperation;電機(jī)在電動運(yùn)行或發(fā)電制動運(yùn)行時，電機(jī)轉(zhuǎn)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(jī)電動運(yùn)行時：V1和VD1組成降壓斬波電路，電機(jī)工作于第1象限Whenthemotoriselectricoperation:V1andVD1formabuckchoppercircuit,andthemotorworksinquadrant1電機(jī)發(fā)電制動時：V2、VD2組成升壓斬波電路；電機(jī)工作于第2象限Whenthemotorisdynamicbrakingoperation,V2andVD2constitutetheboosterchoppercircuit;

Themotorworksinquadrant2Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐冯娏骺赡鏀夭娐返墓ぷ鬟^程

Theoperatingprocessofacurrentreversiblechoppercircuit1：V1和VD1構(gòu)成降壓斬波電路，由電源向直流電動機(jī)供電，電動機(jī)為電動運(yùn)行，V1采用PWM控制方式。1:V1andVD1constituteabuckchoppercircuit,whichsuppliespowertotheDCmotorfromthepowersupply.Themotoriselectricoperation,andV1adoptsPWMcontrolmode.2：V2和VD2構(gòu)成升壓斬波電路，把直流電動機(jī)的功能轉(zhuǎn)變?yōu)殡娔芊答伒诫娫矗闺妱訖C(jī)作再生制動運(yùn)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(dǎo)通而導(dǎo)致的電源短路YouhavetopreventapowershortcircuitfromV1andV2beingonatthesametime只作降壓斬波器運(yùn)行時，V2和VD2總處于斷態(tài)whenthebuckchopperisonlyrunning，V2andVD2arealwaysintheoffstate只作升壓斬波器運(yùn)行時，則V1和VD1總處于斷態(tài)Whenonlytheboosterchopperisrunning,V1andVD1arealwaysintheoffstateCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐?：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(bǔ)控制，即任何時刻總有一個電力電子器件導(dǎo)通Thetwoarecomplementary,meaningthatonepowerelectronicdeviceisalwaysonatanytime當(dāng)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(jī)電樞回路總有電流流過。見下圖：Whenthecurrentofthebuckchoppercircuitortheboosterchoppercircuitisdiscontinuousandzero,maketheotherchoppercircuittoworkandthecurrentflowsintheoppositedirection,sothatthearmaturecircuitofthemotoralwayshascurrentflowing.Seeimagebelow:電機(jī)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(yīng)很快。Motorcurrentflowsinbothpositiveandoppositedirectionsinacycle,andthecurrentisconstant,sotheresponseisfast.Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐冯娏骺赡鏀夭娐返墓ぷ鬟^程

Theoperatingprocessofacurrentreversiblechoppercircuit多相多重?cái)夭娐?/p>

Multiphasemultiplechoppercircuit多相多重?cái)夭娐返慕M成在電源和負(fù)載之間接入多個結(jié)構(gòu)相同的基本斬波電路而構(gòu)成Apluralityofbasicchoppercircuitswiththesamestructureareconnectedbetweenthepowersupplyandtheload相數(shù)重?cái)?shù)一個控制周期中電源側(cè)的電流脈波數(shù)Thenumberofcurrentpulsewavesonthepowersupplysideinacontrolcycle負(fù)載電流的脈波數(shù)ThepulsenumberoftheloadcurrentCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5復(fù)合斬波電路和多相多重?cái)夭娐稢ompositionofmultiphasemultiplechoppercircuitPhasemultiplenumber3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(fù)合斬波電路和多相多重?cái)夭娐范嘞喽嘀財(cái)夭娐?/p>

Multiphasemultiplechoppercircuit特點(diǎn)

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(dāng)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(fù)載為三個獨(dú)立，負(fù)載為三相一重?cái)夭娐稩ftheabovecircuitpowersupplyisshared,andtheloadisthreeindependent,theloadisthree-phaseonechoppercircuit4.如電源為三個獨(dú)立電源，向一個負(fù)載供電時為一相三重?cái)夭娐稩fthepowersupplyisthreeseparatepowersupplies,spplypowertooneload,thatisone-phasetriplechoppercircuit5.多項(xiàng)多重?cái)夭娐酚袀溆?/p>