5.5电流型逆变电路 Current source inverter circuit 中英版

Currenttypeinvertercircuit5.5电流型逆变电路TeachingResourcesDatabaseof

NationalVocationalEducationPowerSupplyTechnologyBilingualcourses.Powerelectronicstechnology电力电子技术Item5InverterCircuit项目五逆变电路图1电流型单相桥式逆变电路及电流波形Fig.1Current-typesingle-phasebridge-typeinvertercircuitandcurrentwaveform1、电流型单相桥式逆变电路电路工作过程：Currenttypesingle-phasebridge-typeinvertercircuitworkingprocess:Currenttypeinvertercircuit5.5电流型逆变电路Load当T1、T4导通，T2、T3关断时，I0=Id；反之，I0=-Id。WhenT1andT4areonandT2andT3areoff,I0=Id;Ontheotherhand,I0=Id.当以频率f交替切换开关管T1、T4和T2、T3时，则在负载上获得如图4.4.1（b）所示的电流波形。WhenswitchingtubeT1,T4,T2,andT3alternatelyatfrequencyf,thenyouwillgetthecurrentwaveformshowninFigure4.4.1(b).输出电流波形为矩形波，与电路负载性质无关，而输出电压波形由负载性质决定。Theoutputcurrentwaveformisarectangularwave,independentofthecircuitloadproperties,whiletheoutputvoltagewaveformisdeterminedbytheloadproperties.主电路开关管采用自关断器件时，如果其反向不能承受高电压，则需在各开关器件支路串入二极管。Whenthemaincircuitswitchtubeadoptstheself-turn-offdevice,ifitsreversecannotwithstandthehighvoltage,itisnecessarytostringthediodeintothebranchoftheswitchingdevice.将图1（b）所示的电流波形i0展开成傅氏级数,有：Thecurrentwaveformi0showninFig.1(b)isexpandedintoaFourierseries,asfollows:2、电流波形参数计算：Calculationofcurrentwaveformparameters:

Currenttypeinvertercircuit5.5电流型逆变电路图1电流型单相桥式逆变电路及电流波形Fig.1Current-typesingle-phasebridge-typeinvertercircuitandcurrentwaveform其中基波幅值I01m和基波有效值I01分别为：Amongthem,thefundamentalwaveamplitudeI01mandtheeffectivefundamentalwavevalueI01arerespectively:图2

电流型三相桥式逆变电路原理图及输出电流波形Fig.2Schematicdiagramofcurrent-typethree-phasebridge-typeinvertercircuit

andwaveformofoutputcurrent1、电流型三相桥式逆变电路工作方式:

Operatingmodeofcurrent-typethree-phasebridge-typeinvertercircuit:输出电流波形和负载性质无关，正负脉冲各120°的矩形波。Theoutputcurrentwaveformisindependentoftheloadnature,andthepositiveandnegativepulsesarerectangularwavesof120°each.输出电流和三相桥整流带大电感负载时的交流电流波形相同，谐波分析表达式也相同。ThewaveformoftheoutputcurrentisthesameasthatoftheACcurrentinthethree-phasebridgerectifierwithalargeinductiveload,andtheharmonicanalysisexpressionisthesame.输出线电压波形和负载性质有关，大体为正弦波。Outputlinevoltagewaveformandloadpropertiesrelated,generallysinewave.输出交流电流的基波有效值。ThefundamentalwaveeffectivevalueoftheoutputACcurrent.Currenttypeinvertercircuit5.5电流型逆变电路导电方式为120°导通、横向换流方式，任意瞬间只有两个桥臂导通。Conductingmodeis120°conduction,transversecommutationmode,onlytwobridgearmsconductionatanymoment.导通顺序为1→T2→T3→T4→T5→T6，依次间隔60°，每个桥臂导通120°。这样，每个时刻上桥臂组和下桥臂组中都各有一个臂导通。Theconductionsequenceis1→T2→T3→T4→T5→T6.Theintervalis60°,andtheconductionofeachbridgearmis120°.

Inthisway,ateachmomentthereisanarmconductionintheupperarmgroupandthelowerarmgroup.Thanksforwatching谢谢观看-更多内容，敬请关注国家级供用电技术专业教学资源库-Formoreinformation,pleasepayattentiontotheTeachingResourcesDatabaseof

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