AC-DC变换技术培训教程

1、AC-DC变换技术培训教程Disu = U sintsmuoRmmTmUUdttUTU5 . 02sin12020.5mUIR 2000011sin0.318TTmmmUUUt dtUtdtUTT000.318mmUUUIRRR dttdiLRtitVmsin tmetLRVti)sin(sin22RLtanRLdttdiLvL）（图4-2 R-L负载图4-3 图4-2各点波形 tmetLRVti)sin(sin22 0)sin(sin22eLRVim, 0)(21)(21020tdtitdtiIo）)(210tdtiIRMS）RIPRMSo2/sinmmtRCVtVV e二极管导通二极管截止

2、sinmVV mV2t图4-4 R-C负载图4-5 图4-4波形tVtVmmcossinRCtmRCtmeVRCeV/sin1sintRCmmeVRCV/sin1cosRCtan 2tsinsin/2RCeCCmVVmax 2t2sinminmVVsin1minmaxmoVVVVRC22 RCmRCmoeVeVV/2/211fRCVVmosinsin/2RCet0图4-6 单相半波可控整流电路及波形纯阻负载tRVimsin0)cos1 (2(sin210mmVttdVV）oV0mV0)22sin(12sin2122mmVttdVURUI cos1)22sin(00UUIIKft图4-7半波可控

3、整流电路及其波形感性负载iRdtdiLtVm0)sin()sin()()()(22)(222tLReLRLVtitLRm0t0)0(i)sin()(22LRLeLRt0)(i)sin()()()(022222LReLRLUiLRm)sin()sin(LWRe)(RLarctg0L00)sin(0RRLtg2)2sin()2sin()(2sin)2sin()cos(cos222)sin()sin(LWRe sin()sincos()cossin()sin()RLe)cos()()(cossintgetgLRcossin)(LRetg0)(tg02 )cos(cos2sin210mmVttdVVR

4、Lvvv0022100diLtddtdiLVLRoVV 返回图4-8 单相全桥整流电路图 4-9带中心抽头的全波整流电路mmmoVVtdtVV637. 02sin10单相全桥整流 带中心抽头的全波整流图4-10 各点电流、电压的波形负载LR 图4-11 R-L负载时桥式整流电路输出波形tnnnVVtvmmo2cos1212142)(1）moVV2121214nnVVmnRVIoo22LnRVLjnRVInnntnIItinoocos1LRL 022LnVLnRVInnnRVItnIItioonoocos12,2RMSnoRMSIIIRIPRMSo21T4T1T4T2utUumsin21T4T

5、tUumsin2123456ABCD654321DCBAT itleN um berR evisionSizeCD ate:10-Jul-2000Sheet of File:D :liw ordlihong1.ddbD raw n B y:T 1T 2T 3T 4Ruiabuid2d2u1uiddtudid图4-12 单相桥式可控整流电路及阻性负载时电流和电压波形)cos1 (0mUV0a0180)cos1 (RUImRL 1T2T3T4T、RL di,ttVumsin2图4-13单向桥式可控整流电路电感性负载LR及输出波形负载电流断续时整流电压、电流波形负载电流断续时整流电压、电流波形电流断

6、续时电流断续时 、 、 的关系：的关系： 越大，越大， 越小越小 越大，越大， 越大越大2,t2222sincos2mdmUUUtd t 2sin222122mmUttdUU22图4-14单相半控桥式整流电路及波形LR，有续流二极管返回)cos1 (0mUV21212222sin12sin22mmUttdUU图4-15 三相全桥整流电路及波形mmmoVVtdtVV955. 03sin31323tVmsinopnnnabvvvv是连续的。是连续的。01t3t 21tt32tt6t123456ABCD654321DCBAT it leN u m b e rR e v is io nS iz eCD

7、 a te :1 0 - J u l- 2 0 0 0S h e e t o f F ile :D : liw o r d lih o n g 1 .d d bD r a w n B y :V T 1V T 2123456ABCD654321DCBAT it leN u m b e rR e v is io nS iz eCD a te :1 0 - J u l- 2 0 0 0S h e e t o f F ile :D : liw o r d lih o n g 1 .d d bD r a w n B y :V T 1V T 2V T 3RTuvwiuABCdduuuu2uduGtttu

8、nv nw n= 0t 1t 2t 3n图4-16 三相半波可控整流电路及波形1t2t3t 030665cos323)(sin23656mmdVttdVU030)6cos(123)(sin236mmdVttdVU212165622)2cos8361(3)(sin23mmVttdVU61t65tvnunuu23twnvnuuo30tVumunsincos233)(sin23656mmdVttdVU2121265622cos83613)(sin23mmVttdVUV T 3uvwudnL cL cL cu v w iiiwvudIuuuuu nv nw nw n/ 6udV T 3uvwudnL

9、cL cL cu v w iiiwvudIuuuuu nv nw nw n/ 6udiiiiiiwuvwuIdihttV T 2V T 14-19变压器漏抗对可控整流电路电压和电流波形的影响dvuIii0dtdidtdivudtdiLdtdiLuuuCvCunvnunvnvCuudtdiL2uvuu 0dtdiv0dtdiuunvnuu2vnunvCvnuCunduudtdiLudtdiLuudCIvCvCdILmdiLmtddtdiLmVd2220cL)cos()cos(mtUumtUumvnmunmtUuumunvnsin.sin2mtUdtdiLmvCsin.sin22sin()cosc

10、os()sinCdmLItdtUm 123456ABCD654321DCBATitleNumberRevisionSizeCDate:10-Jul-2000Sheet of File:D:liwordlihong1.ddbDrawn By:VT1VT3VT5TuvwABCVT4VT6VT2Zidn图4-20 三相桥式整流电路uuv uuw uvw uvuuwu uwvuunuvnuwnu2udtt=0tttt1 3 5 16 2 4 61 13 3 5 516224466uGuGuGuG000000宽脉冲双窄脉冲uvvuuuuuwwuuuuvwwvuuu图4-21三相全桥整流波形及触发脉冲图4

11、-22 =30o、=60o、=90o时三相桥式全控整流电路输出电压波形电感性负载u1,61,22,3uunuvnuw nuvuuvwuw vuw uuuv /6 =30023,44,55,6uuwtu1,61,22,3uunuvnuw nuvuuvwuw vuw uuuv /6 =60023,44,55,6uuwu1,61,22,3uunuvnuw nuvuuvwuw vuw uuuv /6 =90023,44,55,6uuwauw vuw v5,6bc000000udududuuttttt00tUumunsin)32sin(tUumvn32sintUumwn6sin3tUumuv2sin3t

12、Uumvw65sin3tUumwucos33)()sin(331323mmdUtdtUU323313 36sin()1 cos()33dmmUUt d tURL 6t67t6567t123456ABCD654321DCBATitleNumberRevisionSizeCDate:10-Jul-2000Sheet of File:D:liwordlihong1.ddbDrawn By:T1T2RuiidudLD2D3DRiDRT3D1uvwniviwiD2iD3iD1iT1iT2iT3图4-23具有续流二极管的三相半控桥式整流电路65t611t0vuuvuu69t25twvu33uT3,D3T1

13、,D1DT2,D2DDT3,D3uunuvnuwnuun-uwn=uuwuvn-uun=uvuuwn-uvn=uwvuduwn-uvn=uwviT1,iD1iT2,iD2iT3,iD3iDRiutttttttt0000000/6/2/6+7/65/6+11/69/6+2图4-24 三相半控桥式整流电路各点波形带续流二极管，电感性负载返回cos1233)6sin(323676mmdUtdtUU212sin21433mUUTHDTHD表示，其表达式为表示，其表达式为为为95.6%95.6%，输入，输入端功率因数只有端功率因数只有68.3%68.3%。122RMSnRMSnIITHD123456AB

14、CD654321DCBATitleNumberRevisionSizeCDate:10-Jul-2000Sheet of File:D:liwordlihong1.ddbDrawn By:RuabuiOiiD4D2iCD1D3CViiiViiit4-25整流电路及输出电压电流波形02040608010012345678910谐波分量图4-27 相控整流电路的网侧电流波形显的缺乏。显的缺乏。4-28 熄灭角控制电路图及网侧电流波形cos1mdUU2122sin12mUU22/23/225/2(-)/2(+)/2u2udiT1iT3i2Idttttttu2udiT1iT3i2Idtttttt利用图

15、4-29可以实现对称角控制。在对称角控制中功率开关管导通角 是以 k=1,3,5,为中心，因此T1在 时开通，在 时关断；T3在 时开通，在 时关断；持续不断的循环下去，在负载上得到如图4-29所示的电压，网侧电流亦如图4-29所示。 2k22t22t223t223t图4-29对称角控制式的波形 4-30 脉宽调制式的波形PWMpmmmmmPmmdUtdtUUmmm11)cos(cos)()sin(22), 5 , 3 , 1(coscos2)()sin(1)()sin(1)()sin(111202nntnnItdtnItdtnItdtntibpmmmdpmddnmmmmmm）0nmm整流电路

16、电压取样电流取样DC/DC变换器电压取样VO负载误差放大器-VA +给定电压VI乘法器M比较器+CA -驱动电路uut图4-31 PFC原理框图123456ABCD654321DCBATitleNumberRevisionSizeBDate:13-Jul-2000Sheet of File:D:liwordlihong1.ddbDrawn By:LVTVDCRW1LVAVCCVrefW2MXYZCAVCCLVTVDCRW1LVAVCCVrefW2MXYZCAVCCCAVCC电流取样LVTVDCRW1LVAVCCVrefW2MXYZCAVCC电流取样电流取样图4-32 峰值电流法控制的Boost功率因数校正器电路原理框图123456ABCD654321DCBATitleNumberRevisionSizeBDate:13-Jul-2000Sheet of File:D:liwordlihong1.ddbDrawn By:LVTVDCRW1LVAVCCVrefW2MXYZCAVCCLVTVDCRW1LVA1VCCVrefW2MXYZVA2VCCCAVCC电流取样LVTVDCRW1LVAVCCVrefW2MXYZVCC电流取样电流取样-+图4-33 滞环法控制的Boost功率因数校正器电路原理图返