刘蕴红-电工学英汉双语电子教案chapter 11.ppt

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1、Chapter11PowerElectronicTechnique11.1Thyristor11.2ControlledRectifierCircuit*11.3ACVoltageRegulatingCircuit*11.4DCVoltageRegulatingCircuit*11.5InverterCircuit*11.6TriggerCircuit ofThyristor1第11章电力电子技术11.1晶闸管11.2可控整流电路*11.3交流调压电路*11.4直流调压电路*11.5逆变电路*11.6晶闸管触发电路211.1Thyristor晶闸管

2、I.CommonthyristorSymbol符号PNPNG(Gate)门极K(Cathode阴极)A(Anode阳极)AKGBasicstructure32.Operatingprinciples(1)WhenuG≤0WhetheruA>0oruA＜0,thyristorwillbeCut-off。uG≤0时，无论uA>0或uA＜0，晶闸管均截止。PNPNGKA＋uA－＋uG－AGK＋uA－＋uG－NPNKPNPAGPNPNPN4AGK＋uA－＋uG－(2)WhenuA>0,uG>0iG→iB1→T1ison.→iC1=iB2→T2ison.→i

3、B1=iG＋iC2→T1ison.(3)Afterthyristorison,ifuA>0,uG≤0,Thyristorwillremainbeon.晶闸管导通后若uA>0，uG≤0，管子会继续导通。T2T1iGiB1iB2=iC1iA=iE2iC2→Thyristorisonimmediately.5(4)Conditionsfromcut-offtoonofthyristor晶闸管由导通转换为截止的条件uA≤0oriA＜IH（holdingcurrent维持电流）ConclusionThyristorhasthecharacteristicof

4、unilateralconduction.晶闸管具有单向导电性。63.MainParameters主要参数RatedforwardaveragecurrentIF额定正向平均电流IF(2)ForwardrepeatpeakvoltageUFRM正向重复峰值电压UFRM(3)ReverserepeatpeakvoltageURRM反向重复峰值电压URRM(4)GatetriggervoltageUGandtriggercurrentIG控制极触发电压UG和触发电流IG7*II.Bi-directionalthyristor双向晶闸管A2A1GKAG*

5、III.Gateturn-offthyristor可关断晶闸管WhenuA＞0,uG＞0,Thyristorison.WhenuA＞0,uG<0,Thyristorisoff.Theequivalentoftwoinversethyristorsinparallel,whichsharethesamecontrolgate.相当于两个反向晶闸管并联，两者共用一个控制门极。811.2ControlledRectifierCircuit可控整流电路Twoofthefourdiodesinthebridgerectifierisreplacedbytwo

6、thyristors.ThecircuitiscalledFull-wavecontrolledrectifier.单相桥式整流电路中的两个二极管用可控的晶闸管替换，叫做全波可控整流桥。1.StructureabTr+-u2+-u1uGT1D1uGT2D2RL+-uOiO－＋－＋92.OperatingprinciplesDuringthepositivehalfcycleoftheinputvoltage,T2andD1areOFF.输入电压的正半周期,T2和D1关断。GatevoltageuGisappliedatt=α,When≤t≤

7、，T1andD2areON.Currentpath电流通路：a→T1→RL→D2→babTr+-u2+-u1+-uGT1D1+-uGT2D2RL+-uOiO10Duringthenegativehalfcycle,T1、D2areOFFandT2、D1areON.在电压的负半周期，T1和D2关断，T2和D1导通。GatevoltageuGisappliedatt=α+，Sowhen+≤t≤2，T2andD1areON.Currentpath:b→T2→RL→D1→ab+-u2+-u1+-uGT1D1+-uGT2D2RL+-uOiOa11

8、3.Operationwaveforms工作波形++2PartoftheFull-wavevoltagei