4.5复合斩波电路和多相多重斩波电路 Compound chopper circuit and multi-phase multiple chopper circuit中英版

Item4DCChopperCircuit项目四直流斩波电路Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路TeachingResourcesDatabaseof

NationalVocationalEducationPowerSupplyTechnologyBilingualcourses.Powerelectronicstechnology电力电子技术复合斩波电路一一降压斩波电路和升压斩波电路的组合构成Compositechoppercircuit-acombinationofbuckchoppercircuitandboosterchoppercircuit多相多重斩波电路一一相同结构的基本斩波电路组合构成Multiphasemultiplechoppercircuit-acombinationofbasicchoppercircuitsofthesamestructureCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路复合斩波电路:电流可逆斩波电路

Compositechoppercircuit:currentreversiblechoppercircuit该电路用于直流电动机拖动，可使电动机电动运行，或发电制动运行；ThecircuitisusedforDCmotordriving,canmakethemotorelectricoperation,ordynamicbrakingoperation;电机在电动运行或发电制动运行时，电机转向不变，即电枢电压极性不变，仅电枢电流改变方向，故其可工作于第1象限和第2象限；Whenthemotorisinelectricoperationordynamic

brakingoperation,themotorsteeringisunchanged,thatis,thearmaturevoltagepolarityisunchanged,andonlythearmaturecurrentchangesdirection,soitcanworkinthefirstquadrantandthesecondquadrant;电机电动运行时：V1和VD1组成降压斩波电路，电机工作于第1象限Whenthemotoriselectricoperation:V1andVD1formabuckchoppercircuit,andthemotorworksinquadrant1电机发电制动时：V2、VD2组成升压斩波电路；电机工作于第2象限Whenthemotorisdynamicbrakingoperation,V2andVD2constitutetheboosterchoppercircuit;

Themotorworksinquadrant2Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路电流可逆斩波电路的工作过程

Theoperatingprocessofacurrentreversiblechoppercircuit1：V1和VD1构成降压斩波电路，由电源向直流电动机供电，电动机为电动运行，V1采用PWM控制方式。1:V1andVD1constituteabuckchoppercircuit,whichsuppliespowertotheDCmotorfromthepowersupply.Themotoriselectricoperation,andV1adoptsPWMcontrolmode.2：V2和VD2构成升压斩波电路，把直流电动机的功能转变为电能反馈到电源，使电动机作再生制动运行，工作于第2象限，V2采用PWM控制方式。2:V2andVD2constitutetheboosterchoppercircuit,whichconvertsthefunctionoftheDCmotorintoelectricenergyandfeedsbacktothepowersupply,sothatthemotorrunsforregenerativebrakingandworksinthesecondquadrant.V2adoptsPWMcontrolmode.必须防止，V1和V2同时导通而导致的电源短路YouhavetopreventapowershortcircuitfromV1andV2beingonatthesametime只作降压斩波器运行时，V2和VD2总处于断态whenthebuckchopperisonlyrunning，V2andVD2arealwaysintheoffstate只作升压斩波器运行时，则V1和VD1总处于断态Whenonlytheboosterchopperisrunning,V1andVD1arealwaysintheoffstateCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路3：第三种工作方式：一周期内作为降压斩波电路和升压斩波电路交替工作Thethirdworkingmode:alternatelyworkasabuckchoppercircuitandboosterchoppercircuitwithinaweek

控制方式：V1和V2均采用PWM控制方式

Controlmode:bothV1andV2adoptPWMcontrolmode二者互补控制，即任何时刻总有一个电力电子器件导通Thetwoarecomplementary,meaningthatonepowerelectronicdeviceisalwaysonatanytime当降压斩波电路或升压斩波电路的电流断续而为零时，使另一斩波电路工作，让电流反方向流过，这样电动机电枢回路总有电流流过。见下图：Whenthecurrentofthebuckchoppercircuitortheboosterchoppercircuitisdiscontinuousandzero,maketheotherchoppercircuittoworkandthecurrentflowsintheoppositedirection,sothatthearmaturecircuitofthemotoralwayshascurrentflowing.Seeimagebelow:电机电流在一周期内沿正、反两个方向流通，电流不断，所以晌应很快。Motorcurrentflowsinbothpositiveandoppositedirectionsinacycle,andthecurrentisconstant,sotheresponseisfast.Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路电流可逆斩波电路的工作过程

Theoperatingprocessofacurrentreversiblechoppercircuit多相多重斩波电路

Multiphasemultiplechoppercircuit多相多重斩波电路的组成在电源和负载之间接入多个结构相同的基本斩波电路而构成Apluralityofbasicchoppercircuitswiththesamestructureareconnectedbetweenthepowersupplyandtheload相数重数一个控制周期中电源侧的电流脉波数Thenumberofcurrentpulsewavesonthepowersupplysideinacontrolcycle负载电流的脉波数ThepulsenumberoftheloadcurrentCompositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路CompositionofmultiphasemultiplechoppercircuitPhasemultiplenumber3相3重降压斩波电路

3-phasetriplebuckchoppercircuit由3个相同的降压斩波单元电路并联而成；Itiscomposedofthreeidenticalbuckchopperunitcircuitsinparallel.输出电流为3个斩波电路单元输出电流之和，其值为单元输出电流平均值的3倍，脉动频率也为3倍；Theoutputcurrentisthesumoftheoutputcurrentofthreechoppercircuitunits,anditsvalueis3timestheaveragevalueoftheunitoutputcurrent,andthepulsationfrequencyisalso3times.由于3个单元电流的脉动幅值互相抵消，使总的输出电流脉动幅值变得很小；Becausethepulsationamplitudesofthethreeunitscanceleachother,thepulsationamplitudesofthetotaloutputcurrentbecomeverysmall.Compositechoppercircuitandmultiphasemultiplechoppercircuit4.5复合斩波电路和多相多重斩波电路多相多重斩波电路

Multiphasemultiplechoppercircuit特点

Features：1.输出电流最大脉动率（电流脉动幅值与电流平均值之比）与相数的平方成反比Themaximumpulsationrateoftheoutputcurrent(theratioofthecurrentpulsationamplitudetothecurrentmean)isinverselyproportionaltothesquareofthephasenumber2.和单相时相比，当输出电流最大脉动率相同时，所需平波电抗器总重量大为减轻Comparedwithsingle-phasereactor,whenthemaximumpulsationrateoftheoutputcurrentisthesame,thetotalweightoftheflat-wavereactorisgreatlyreduced3.如上述电路电源共用，而负载为三个独立，负载为三相一重斩波电路Iftheabovecircuitpowersupplyisshared,andtheloadisthreeindependent,theloadisthree-phaseonechoppercircuit4.如电源为三个独立电源，向一个负载供电时为一相三重斩波电路Ifthepowersupplyisthreeseparatepowersupplies,spplypowertooneload,thatisone-phasetriplechoppercircuit5.多项多重斩波电路有备用