TRNG I HC TN C THNG KHOA IN - IN T B MN IU KHIN T NG #" TI LIU HNG DN TH NGHIM IN T CNG SUT Tp.H Ch Minh, thng 4 - 2010 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t1/72 NI QUY PHNG TH NGHIM IN-IN T IU I. TRC KHI N PHNG TH NGHIM SINH VIN PHI: 1. Nm vng quy nh an ton ca phng th nghim. 2. Nm vng l thuyt v c k ti liu hng dn bi thc nghim. 3. Lm bi chun b trc mi bui th nghim. Sinh vin khng lm bi chun b theo ng yu cu s khng c vo lm th nghim v xem nh vng bui th nghim . 4.nphngthnghimnggiquynhvgitrttchung.Tr15pht khng c vo th nghim v xem nh vng bui th nghim . 5. Mang theo th sinh vin v gn bng tn trn o. 6. Tt in thoi di dng trc khi vo phng th nghim. IU II. VO PHNG TH NGHIM SINH VIN PHI: 1. Ct cp, ti xch vo ni quy nh, khng mang dng c nhn vo phng th nghim. 2. Khng mang thc n, ung vo phng th nghim. 3. Ngi ng ch quy nh ca nhm mnh, khng i li ln xn. 4. Khng ht thuc l, khng khc nh v vt rc ba bi. 5. Khng tho lun ln ting trong nhm. 6. Khng t di chuyn cc thit b th nghim IU III. KHI TIN HNH TH NGHIM SINH VIN PHI: 1. Nghim tc tun theo s hng dn ca cn b ph trch. 2. K nhn thit b, dng c v ti liu km theo lm bi th nghim. 3. c k ni dung, yu cu ca th nghim trc khi thao tc. 4. Khi my c s c phi bo ngay cho cn b ph trch, khng t tin sa cha. 5. Thn trng, chu o trong mi thao tc, c thc trch nhim gi gn tt thit b. 6.Sinhvinlmhhngmymc,dngcthnghimthphibithngcho Nh trng v s b tr im th nghim. 7.Saukhihonthnhbithnghimphittmy,ctinvlausch bn my, sp xp thit b tr v v tr ban u v bn giao cho cn b ph trch. IU IV. 1. Mi sinh vin phi lm bo co th nghim bng chnh s liu ca mnh thu thp c v np cho cn b hng dn ng hn nh, cha np bo co bi trc th khng c lm bi k tip. 2. Sinh vin vng qu 01 bui th nghim hoc vng khng xin php s b cm thi. 3.Sinhvinchahonthnhmnthnghimthphihclitheoquynhca phng o to. 4.Sinhvinhonthnhtonbccbithnghimtheoquynhscthi nhn im kt thc mn hc. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t2/72 IU V. 1. Cc sinh vin c trch nhim nghim chnh chp hnh bn ni quy ny. 2.Sinhvinnoviphm,cnbphtrchthnghimcquyncnh bo, tr im thi. Trng hp vi phm lp li hoc phm li nghim trng, sinh vin s b nh ch lm th nghim v s b a ra hi ng k lut nh trng. Tp.HCM, Ngy 20 thng 09 nm 2009 KHOA IN-IN T ( k) PGS TS. PHM HNG LIN Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t3/72 BO CO TH NGHIM BI TP 1: GII THIU V BOARD MCH IU KHIN PHA V THYRISTOR SCR V MCH CHNH LU CNG SUT SCR KCH BNG UJT I - MC CH BI HC - Lm quen vi cc board mch chnh lu bng cc linh kin in t cng sut. Xc nh cc thyristor trong cc khi mch trn board. - Tm hiu board mch Mch thyristor v mch iu khin pha s dng mt vi loi Thyristor khc nhau trong cc cu trc mch mt chiu v xoay chiu. - Tm hiu s k hiu ca cc thit b nh UJT. II NHC LI L THUYT - Transistor mt tip xc (UJT) l thit b 3 cc nhng ch c mt tip gip PN. Cu to UJT c cho nh trong hnh sau: Hnh 1.1 - UJT ch to bng vt liu N v mt t vt liu loi P bn. Hai cc u vt liu loi N gi l Base1 v Base2. Cc gn vi vt liu loi P gi l Emitter. Base2 thng phn cc dng hn Base1. Nu khng c p t vo cc Emitter, vt liu gia 2 cc B1-B2ctngtrcao,UJThmchvkhngcdngchyquaUJT.Mchphn cc ca UJT c cho trong hnh sau: Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t4/72 Hnh 1.2 - Khi c p cp vo mch, t s np n in p VBB thng qua in tr R1 n in p VP. VP l hm ca in p ngun VBB. - Khi UJT np n VP th t s x thng qua mi ni E-B1. in p trn cc E gim xung. Khiinptrncc E gimxung gi trVVthUJTsngng dn,tCs tiptcnpvqutrnhctiptcnhvy.DngsngtrnccEcchotrong hnh sau: Hnh 1.3 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t5/72 Tham sCc Gii hniu kin lm th nghim K hiu n v tnh Cc nh nghaCc tiu (Min.) Cc i (Max.) T 0CRGK Ohm VAA Volt Cc iu kin khc V.TMVoltTrng thi in p m cc i _2.225__Dng ti a ITM = 4 Amps IDRMATrng thi dng in ng (off State) cc i _ _ 10 100 25 125 1K 1K VDRM VDRM IRRMADng in ngc c i (Peak reverse current) _ _ 10 100 25 125 1K 1K VRRM VRRM IGTADng cc cng Trigger _200256 VGTVoltp cc cng Trigger_0.8256 IHmADng duy tr_3.0251K6 Il-mADng kho @_4.0251K6 TonsThi gian m (td+tr)_1.0*25VDRMIT = 1A, IG = 135mA TqsThi gian ng (Turn-off) _100251KOPENIF = IR = 1A Dv/dtV/sNgun danh nh VDRM 100*_251KVDRM Bng 1- 1: Bng c tnh k thut c trng ca SCR. Hnh 1.4: Board mch ca Mch thyristor v mch iu khin pha. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t6/72 BI TP 1.1:LM QUEN BOARD MCH TIN TRNH TH NGHIM 1.Tt ngun, quan st board mch ca Mch thyristor v mch iu khin pha v tr li cc cu hi sau vo bng 1.2 2.Trnboardmchcnhngkhimchno?Trongtngkhimch,thyristorno lm thnh phn chnh trong mch. in tn khi mch v thyristor lm thnh phn chnh trong tng khi mch vo bng 1.2 3.Nhng khi mch no c s dng Transistor mt tip gip UJT? 4.Nhng khi mch no c s dng ngun xoay chiu? 5.Nhngkhimchnocsdngngunmtchiu(ngunmhocdng)c nh? 6.Nhng khi mch no c s dng ngun mt chiu (ngun m hoc dng) thay i c? Ch : SV nh du X nu trong khi mch c thnh phn , nh du O nu trong khi mch khng c thnh phn STTTn khi mch Tn thyristor chnh C s dng UJT Ngun AC Ngun DC c nh Ngun DC thay i uc Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t7/72 BI TP 1.2: NGUYN TC C BN CA MCH THYRISTOR TIN TRNH TH NGHIM 1.Xc nh v tr khi truyn ng Driver trn bo mch Mch thyristor v mch iu khin pha. u vo ca mch truyn ng c tn GEN ni cho my pht. uracamchtruynnglngunxoaychiucungcpchocckhimch thyristor. Khi mch truyn ng c trnh by trn hnh 1.5: Hnh 1.5: Khi mch truyn ng 2. Ni my pht sng ti u vo ca khi mch truyn ng (Driver). Dng dao ng knivouracakhimchtruynng(haiuthanhodaongkni n 2 u k hiu xoay chiu bt k trn board mch). Cp ngun cho board mch, my pht v dao ng k. 3. ChnhmyphtsngSin,tns60HZ.Thayibintnhiutrnmypht. Quan st tn hiu trn mn hnh dao ng k. Nhn xt v bin v tn s tn hiu quan st c. _______________________________________________________________________________________________________________________________________________________________________________________________________________ 4. Dng VOM ch o p DC. o in p ngun dng c nh:_____________ 4. Dng VOM ch o p DC. o in p ngun m c nh: _______________ 5. Dng VOM ch o p DC. t 2 u que o trn ngun dng thay i c. Thay i in p ngun dng bng cch vn nm POSITIVE SUPPLY gc phi board mch. in p ngun dng thay i trong khong no?________________ 6. DngVOMchopDC.t2uqueotrnngunmthayic. ThayiinpngunmbngcchvnnmNEGATIVESUPPLYgctri board mch. in p ngun m thay i trong khong no?___________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t8/72 BI TP 1.3: KIM TRA SCR BNG NG H VN NNG TIN TRNH TH NGHIM 1.Tt ngun, lp board mch vo chn .2.Xt khi SILICON CONTROLLED RECTIFIER (SCR) trn board mch Hnh 1.63.t ng h vn nng ch o diode. Kt ni que m ca ng h vo anode v que dng vo cathode ca SCR. ng h hin th g? ____________________4.i 2 que o ngc li. ng h hin th g? ______________________________ 5T cu 3 v cu 4 hai cc anode v cathode c ging vi mt diode bnh thng khng? ____________________________________________________________ 6. Kt ni que m vo anode, que dng vo cng G. ng h hin th g? _________ 7. o u 2 que o. ng h hin th g? ___________________________________8.Tcu6v7haiccanodevcngGcgingviktqucamtdiodebnh thng khng? ______________________________________________________ 9. Kt ni u m ca ng h vo cc cng G v u dng vi cathode. ng h hin th g? _________________________________________________________ 10.o u 2 que o. ng h hin th g? _______________________________ 11.T cu 9 v 10 cc cng G v cathode c ging nh khi o diode bnh thng khng? ____________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t9/72 BI TP 1.4:HOT NG CA SCR TRONG MCH MT CHIU. TIN TRNH TH NGHIM Hnh 1.7 1.Tt ngun, trong khi mch SILICON CONTROLLED RECTIFIER ni mch nhnh hnh 1.72.iu chnh nm vn gc trn cng bn tri ca board mch (positive supply) VA = 6Vdc. 3.t VOM ch o p DC. o in p gia anode v cathode. VAK = 4.t VOM ch o p DC. o in p ri trn in tr R4. VR4 = 5.SCR ang dn hay tt? ____________Ti sao?____________________________ 6.Nhn v nh cng tc S1. Xc nh VAK= VR4= 7.SCR ang dn hay tt? _____________Ti sao?____________________________ 8.Nh cng tc S1. SCR tip tc dn hay ngt? ______________________________ Gii thch? _________________________________________________________ __________________________________________________________________ 9.Nu ngt in p khi cng SCR khng lm cho SCR ngng dn in, lm sao SCR ngng dn in? ________________________________________________ KT LUN ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t10/72 BI TP 1.5: IN P TRIG TRN CC CNG V DNG GI TIN TRNH TH NGHIM 1.Ttngun.XcnhkhimchSILICONCONTROLLEDRECTIFIER(SCR). Xoay ht c bin tr R3 theo chiu ngc chiu kim ng h. Ni mch nh trn hnh 1.8. Hiu chnh ngun +VA n 6.0Vdc. Hnh 1.8: S ni mch i vi phng php trig cng 2.o VGK bng ng h vn nng (t ch o p DC). SCR ang dn tt?____ Ti sao?__________________________________________________________ 3.Xoay R3 theo chiu kim ng h t t cho n khi SCR m, ti sao bn bit SCR m? ______________________________________________________________ 4.Vn nh bin tr R3 ngc chiu kim ng h. 5.Ngt nhanh u ni 2 cng R4 cho SCR tt sau t li u ni . Nu mch SCR m khi u ni c gn li, lp li bc 4 v 5 cho n khi SCR ngt. 6.Lp li bc 3, 4 v 5 cho n khi in p cng gn st vi im m m khng lm SCR m.in p VGK lc ny bng? VGK = 7.Ni mch nh trn hnh v 1.9. Vn R3 theo chiu kim ng h ht c c in trcc tiu. Nhn v nh S1 m mch SCR. Hnh 1.9. S ni SCR i vi phng php o mchgi. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t11/72 8.Dnganode(IA)camtSCRbhnchbiintranodevcthtnhton theo nh lut Ohm nh sau: IR4 = ER4 / R4. Trong :ER4 = VA - VAK

VA: in p ngun VAK: in p anode im m 9. o v ghi in p ri qua R4, VR4 =. Tnh dng anode IA s dng theo cng thc IA = IR4 = 10. Dng gi (IH) c th tnh khi xc nh c im tt ca thit b. Dng gi (IH) l dnganodechyquatrckhiSCRtt.VnR3theongcchiukimngh mt cch t t trong khi quan st VAK. Khi SCR ngng dn, vn bin tr R3 t t theochiukimnghvnhnS1mmchSCRmtlnna.NuSCR khng m th lp li bc ny cho n khi n m. 11.Lpliccbc10chonkhibnxcnhcvtrSCRtrckhintt. Dng anode SCR im ny l dng gi. 12.KhiVAKcao.Lpliccbc11,12chonkhibnchngkinSCRnm im trc khi n tt. Dng anode SCR im ny l dng gi. 13. Tnh dng gi IH: IH = ER4 / R4. (Trong ER4 c o trc khi thit b tt) Bn xc nh c gi tr IH bng bao nhiu? KT LUN _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t12/72 BI TP 1.6:CC C TNH CA UJT TIN TRNH TH NGHIM 1.Ttngun,xcnhkhimchkhimchSCRACGATEANDUJTHALF-WAVEANDFULL-WAVE/MOTORtrnboardmchTHYRISTORAND PHASE CONTROL CIRCUIT. Nimch in nh hnh 1.10. iuchnhchit p R2 ngc chiu kim ng h ht mc. Hnh 1.10 Hnh 1.11 2.XcnhkhimchDRIVERvnimyphttnhiutiuvomch DRIVER (GEN) 3.Niknh1cadaongkquangunVacnhhnh1.10.iuchnhtns my pht in l 60Hz (16,67ms) trn dao ng k. 4.Ni vn k xoay chiu qua ngun Vac nh hnh 1.10. iu chnh my pht in cho tn hiu ngun c tr hiu dng Vac = 6,3V. 5.Tho knh 1 t Vac v ni n ti B1 ca UJT nh hnh 1.11. C mt xung dng ti B1 khng? O C O Khng 6. knh 2 dao ng k GND. Ghi nh v tr ny. Chuyn knh 2 dao ng k sang ch o DC. Ni knh 2 ti emitter ca UJT nh hnh 1.11. in p nh ca dng sng trong knh 2 c di0 khng? 7.XoayR2tttheochiukimnghngthcxungxuthintrnknh1 (B1) khng? O CO Khng 8.Dichuynknh2daongksangVAC.Quanstknh1vknh2trndao ng k 9.Tip tc xoay R2 t t theo chiu kim ng h ng thi kim tra knh 1 (UJT B1) khong thi gian tr thay i trong khong bao nhiu ? 10.iuchnhR2xungB1trongknh1trxpx 900.Vdng sngccE, B1 ca UJT.

Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t13/72 V dng sng quan st c 11.Xung ti B1 s c dng cho trigger SCR trong bi tip theo. rng ca xung ti B1 c kch cho SCR khng? O C O Khng KT LUN ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t14/72 BI TP 1.7 IU KHIN PHA UJT BN K/ TON K TIN TRNH TH NGHIM 1.Ttngun,xcnhkhimchSCRACGATEANDUJTHALF-WAVEAND FULL-WAVE/MOTOR trn board mch.Ni mch in nh hnh 1.12. iu chnh chit p R2 theo ngc chiu kim ng h ti v tr nh nht. 2.Xc nh khi mch DRIVER v ni my pht tn hiu ti u vo mch DRIVER (GEN) 3.Ni knh1 ca dao ng k qua ngun Vac nh hnh 1.10. iu chnh my pht tn hiu ngun VAC sng Sin, tn s 60Hz (16,67ms), bin 18VP-Ptrn dao ng k. 4Di chuyn knh 1 ca dao ng k n in tr R8 nh hnh 1.12. Quay R2 theo chiu kim ng h ht mc. Hnh 1.12 V dng sng quan st c 5. Gc dn in c xp x 1800 khng? O C O Khng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t15/72 6.Xoay chit p R2 t t ngc chiu kim ng h. Gc dn in c gim khng? O C O Khng 7. Xoay R2 n im m sng hin ln bng 0. Gc dn in ca sng bng bao nhiu trc khi ti im ny? ________________________________________ 8. Khong iu khin pha ca mch in xp x bng bao nhiu? ______________ Hnh 1.13 9.Ni mch nh hnh 1.14. 10. Vi knh 1 ca dao ng k ni qua R8, quan st dng sng hin ln. V dng sng quan st c 10.Tn hiu c c chnh lu ton sng khng? O C O Khng 11. Gc dn in mi bn k l bao nhiu? __________________________________ 12. iu chnh tn hiu my pht in l 7,0 Vpk trn ti. Xoay R2 theo chiu kim ng h ht mc c gc dn in cao nht. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t16/72 Hnh 1.14 13. S dng chc nng o DC ca VOM o in p qua in tr R8. VR8 = 14. Gi tr o c trong cu 14 l gi tr hiu dng hay gi tr trung bnh? ________ 15. ng h vn nng vn ni qua in tr R8, xoay R2 ngc chiu kim ng h v quan st kt qu ca thit b o. Kt qu gim hay tng ln? O Tng O Gim KT LUN ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t17/72 BO CO TH NGHIM Bi TP 2: SCR IU KHIN CNG SUT DC V AC I MC CH BI HC -Bithnghimnyminhhavicsdng 1 SCR iukhincngsutmt chiu v xoay chiu bng cch s dng cc mch chnh lu in hnh. - Bi th nghim ny minh ha cc hot ng vi tn hiu mt chiu v xoay chiu ca Triac. IINHC LI L THUYT - TRIAC l mt cng tc bn dn Triode AC. N hot ng ging nh hai SCR mc isong.Ncthdncc2bnkmvdngcainp.Mtctn gincaTRIACnhhnh2.1.Triaccbainccchnh:ccchnh1(MT1),cc chnh 2(MT2), v cng G. Gi l MT2 v MT1 v dng in chy qua l hai chiu.-VicngTriactheoc2chiucthchinnhmtcccngduynhtGv dng qua cng G c chiu bt k. Tng t nh SCR, Triac cng tn ti dng gi. (SV tham kho c tnh VA, c tnh ng Triac trong sch in t cng sut ca tc gi Nguyn Vn Nh -NXB H QG TP HCM) Hnh 2.1 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t18/72 BI TP 2.1: DNG SCR CHNH LU BN K TIN TRNH TH NGHIM 1-Ttngun,xcnhvtrkhimchSCRDCGATEHALF-WAVEtrnboard mch. Kt ni nh hnh v 2.2 Hnh 2.2 Hnh 2.3 2- Xc nh khi mch DRIVER v ni tn hiu trn my pht vo khi mch u vo (GEN). iu chnh tn hiu trn my pht sao cho ngun Vac c dng sng hnh sin 18 Vpk-pk, 60Hz trn mch. iu chnh VA ti 10 Vdc. 3- Ni knh 1 ca Oscilloscope vo ti (R4) nh hnh v 2.3. C phi SCR ang dn khng? O ngO Sai 4- Nhn v gi nt S1. C phi SCR c dn khi nt S1 c nhn? O ngO Sai V dng sng trn ti R4 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t19/72 5- Khi S1 c nh, SCR c dng dn khng? O C O Khng 6- Ni dao ng k nh hnh v 2.4: Hnh 2.4 7- Nhn v gi nt S1. Quan st k tn hiu m SCR bt u dn. So snh im dn vi im 0 chun. Ti in p no th SCR dn dng? _________________8- Nhn v gi nt S1. t VOM ch o p DC. o in p cc cng (cc iu khin) ca SCR nh trn hnh2.5. in p hin th trn ng h l bao nhiu?VG = Hnh 2.5 Kt lun: _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t20/72 BI TP 2.2:SCR IU KHIN MCH CHNH LU BN K TIN TRNH TH NGHIM 1-Tt ngun, xc nh v tr khi mch SCR DC GATE HALF-WAVE trn board mch. Kt ni nh hnh v 2.6. Hnh 2.6Hnh 2.7 2- Xc nh khi mch DRIVER v ni tn hiu trn my pht vo khi mch u vo (GEN).Niknh1caOscilloscopevovtrngunVac(uraDRIVER).Bt ngun, iuchnhtnhiutrnmyphttodngsnghnhsin18Vpk-pk, 60Hzi vi ngun Vac trn mch. iu chnh VA ti 10 Vdc. 3-Niknh1caOscilloscopevoti(R4)nhhnhv2.7.Quansttnhiutrn ti. t VOM ch o p DC, o in p trn anode ca SCR, cho bit SCR ang m hoc ang ng? 4- Nhn v gi nt S1 trong khi ang quan st Oscilloscope. Dng tn hiu trn ti c phi l dng chnh lu bn k khng? O ng O Khng V dng tn hiu trn ti. VAK= O ng O M Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t21/72 Khi cng tc c nh, SCR dn hay tt? O ngO Khng SCR dn trong bn k dng hay bn k m hay trong c 2 bn k? ______________ Thnh phn no ca mch l thit b iu khin?_____________________________ Lm th no d dng ngt dng trn SCR trong mch ny? ___________________ 5- Ni Oscilloscope vo ti nh hnh v 2.8. iu chnh tn hiu trn my pht cho ti 7.0 Vpk trn ti. t VOM ch o p DC, o gi tr in p trn R4? __________ Hnh 2.86- Vi VOM vn c kt ni trn ti tr (R4) gim tht chm bin ca tn hiu ngun v ghi chp li gi tr c c khi gim. Cng sut tiu tn trn ti tr tng hay gim? O Tng O Gim Kt lun _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Vic o trong bc 5 c c gi tr tc thi hay l gi tr trung bnh? ___________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t22/72 BI TP 2.3IU KHIN B CHNH LU TON K SCR TIN TRNH TH NGHIM 1-Ttngun,xcnhkhimchSCRDCGATEHALF_WAVEAND FULL_WAVE. Kt ni mch nh hnh 2.9. Hnh 2.9 2- Xc nh khi DRIVER v kt ni my pht tn hiu n ng vo mch DRIVER (GEN). 3- Kt ni knh 1 ca dao ng k vo ngun Vac trn board mch (hay l ng ra ca DRIVER). iu chnh my pht tn hiu thu c tn hiu sin tn s 60 Hz v bin 18 Vp-p ngun mch (Vac). iu chnh VA t 10 Vdc. 4-Kt ni dao ng k o hai u R4 nhchra hnh 2.9, quan st tn hiuti. DngVOMtthangoinpDC,oinpAnode-Cathode(VAK)caSCR. T kt qu, SCR dn hay khng dn ?VAK= O OnO Off 5- Nhn cng tc S1 trong khi quan st dao ng k. Tn hiu ti chnh lu ton cu phi khng ?. O ngO Sai 6- Trong lc gi cng tc S1, quan st dng sng trn R4 bng Oscillocope v v dng sng trn R4 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t23/72 7- Nh cng tc ra, SCR vn tip tc dn phi khng ?. O ngO Sai 8- iu chnh tn hiu my pht n 7.0 Vp trn ti. Dng chc nng DC ca VOM, o lng in p ri trn in tr ti (R4). Ghi li kt qu. VR4= Kt lun _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t24/72 BI TP 2.4IU KHIN PHA BN K SCR TIN TRNH TH NGHIM 1- Tt ngun, xt khi mch SCR AC GATE AND UJT HALF WAVE AND FULL WAVE/ MOTOR trn board. Ni mch nh hnh 2.10, iu chnh R2 ti v tr cc i theo chiu kim ng h c c in p m ti a. Hnh 2.10 Hnh 2.11 2- Ni my phttn hiu ti u vo khi DRIVER. 3-Sdngknh1cadaongk,nique(+)voR8(imni)vque(-)vo im t. iu chnh tn s pht ti 60Hz. t ng h ch o p AC, iu chnh bin my pht sao cho ngun VAC =6.3 Vrms (tr hiu dng). 4- Ni knh 1 ca dao ng k theo hnh 2.11. 5- Quan st dng sng trn ti. V dng sng quan st c. 6-C phi gc m xp x 180 khng? O ng O Sai 7-iu chnh R2 chm theo nguc chiu kim ng h. Gc m c gim khng? ___ 8-Tip tc iu chnh cho ti khi dng sng trn ti v 0. Gc m snh th no ti im ngay trc ? _________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t25/72 9-Ni dao ng k nh hnh 2.12 Hnh 2.12 10-iuchnhR2chotigitrmaxtheochiukimngh.Vdngsngca anode v cc iu khin SCR. V dng sng quan st c 12- iu chnh R2 ngc chiu kim ng h. Gc m tng hay gim? O Tng O Gim Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t26/72 13- Tip tc chnh R2 ngc chiu ng h cho ti im m SCR ngng dn.14- iu chnh R2 cho ti im m SCR bt u m. Gc dn khi ny bng bao nhiu? _______________________________________________________________ 15- Mc thm t in vo nh hnh 2.13. iu chnh R2 theo chiu kim ng h c c gc m ln nht. Ni knh 1 dao ng k ti im R8 (hnh 2.13). 16- T C1 c lm thay i gc m khng so vi trng hp khng c t nh kho st trn? O C O Khng Hnh 2.13Hnh 2.14 16- Chnh R2 ngc chiu kim ng h v quan st trn dao ng k. Gc m tng hay gim? O TngO Gim 17- Tip tc chnh R2 cho ti khi dng sng ti xp x 0. Gc m c th gim ti 0 khng? O CO Khng 18-TivtrR2maxtheochiukimngh,ginguyndaongk,iuchnh my pht tn hiu sao cho in p trn tic gi tr 7 Vpk 19- Dng VOM ch DC. o in p ri trn R8, ghi li kt qu. VR8= Gi tr ny l gi tr trung bnh hay hiu dng?_____________________________20- Vi dao ng k ti v tr R8 v ng h o gi tr in p trung bnh trn ti, ni mch nh hnh 2.14.21-Chnh R2 t t theo ngc chiu kim ng h. Khi dng sng ti tin ti 0 th gi tr trung bnh ca in p c v 0 khng? O CO Khng Kt lun: ______________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t27/72 BI TP 2.5: IU KHIN PHA TON K TIN TRNH TH NGHIM 1-Ttngun,xtkhimchSCRACGATEANDUJTHALFWAVEAND FULL WAVE/ MOTOR trn board. Ni mch nh hnh 2.15, iu chnh R2 ti v tr cc i theo chiu kim ng h. Hnh 2.15 Hnh 2.16 2- Ni my pht tn hiu ti u vo ca khi Driver (GEN). 3- Ni knh 1 dao ng k vi Vac. iu chnh ngun Vac dng sin c bin 18Vpk-pk v tn s 60 Hz 4- Ni knh 1 ca dao ng k ti R8 nh hnh 2.16. 5- Quan st dng sng. V dng tn hiu quan st c. 6- Chnh lu trong mch lO Chnh lu ton k O Chnh lu bn k. 7- Chnh R2 ngc chiu kim ng h. Gc dn tng hay gim?O TngO Gim 8- Ni knh 1 v 2 ca dao ng k nh hnh v 2.17 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t28/72 Hnh 4-17 9- Chnh R2 cc i theo chiu kim ng h c gc m cc i. V dng sng cc cng v anode SCR. 10- Gim R2 cho ti khi SCR ngng dn. iu chnh sao cho SCR ti im bt u m. Gc bt u m l bao nhiu? _______________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t29/72 12-ThmtC1nhhnh2.18.ChnhR2maxthunchiu kimng h. Ni knh 1 dao ng k vo R8. Hnh 2.18 13- Vic thm vo t in C1 c lm thay i gc m so vi trng hp khng thm t in ( xt trn) khng? O C O Khng 14- Vn R2 t t theo ngc chiu kim ng h cho n khi dng sng trn ti v 0. Gc m khi ny c khc vi trng hp khng gn t khng? O C O Khng 15-VnR2ccitheochiukimngh,iuchnhinptrnti7VPk.Dng ng h (chc nng DC) o gi tr in p trung bnh ri trn in tr R8. Ghi li kt quKt lun _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t30/72 BI TP 2.6 BN CH TRIGGER TINTRNH TH NGHIM 1.Ttngun.XtkhiTRIACACPOWERCONTROLlnboardmch.Ktni mchnhhnh2.22.Hiuchnh+VAti+10V.Ktniknh1caoscilloscope vi MT2 ca TRIAC. Quan st trn dao ng k. in p MT2 l bao nhiu? ___ Hnh 2.22 2.Nhn v gi S1. Dng VOM ch DC, u dng ni cc G ca Triac v u m ni vi mass.in p c c trn ng h l bao nhiu? ________________ 3.o in p ri trn R6 bng VOM ch o p DC. Kt qu cho thy c dng qua MT2 khng? O C O Khng 4.Quan st trn knh 1 ca oscilloscope? in p MT2 khi ny l bao nhiu? _____ 5.TRIAC c dn khng? O C O Khng 6.Quan st cc tnh ng h vn nng. T kt qu c trn ng h dng chy qua TRIAC theo hng no?______________________________________________ 7.Kim tra bng 2.2, cho bit ch vn hnh ca TRIAC? ___________________ Ch Gc phn tiu kin II+MT2 dngCc cng dng III-MT2 dngCc cng m IIIIII+MT2 mCc cng dng IVIII-MT2 mCc cng m Bng 2.2 8.Nh S1, in p cng b ngt. Triac c tip tc dn hay khng? O C O Khng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t31/72 9.Ktnimchnhhnh2.23,uo1caoscilloscopevnktniviMT2. Nhn v gi S1. in p ti MT2 l bao nhiu? ______________________________ Hnh 2.23 10. oinpritrnR6bngVOM.Ktqucnychobitcdngchyqua MT2 phi khng? O C O Khng 11. Quan st dao ng k. in p VMT2 by gi l bao nhiu? __________________ 12. Nhn v gi S1. Quan st dao ng k. in p trn MT2 l bao nhiu? _____ 13. Dng VOM o in p ri trn R6. Gi tr c c l bao nhiu? ____________ 14. TRIAC c dn khng? O C O Khng 15. Kim tra bng 2.2, cho bit ch vn hnh ca TRIAC? ___________________ 16. Nimchnhhnh2.23.uo1caoscilloscopevnktniviMT2.Hiu chnh VA ti 6 Vdc. Nhn v gi S1. in pVG l bao nhiu? _____________ 17.Quan st dao ng k. in p VMT2 by gi l bao nhiu? __________________ 18. TRIAC c dn khng? O C O Khng 19. Kim tra bng 2.2, cho bit ch vn hnh ca TRIAC? ___________________ 20. Kt ni mch nh hnh 2.24, u o 1 ca oscilloscope vn kt ni vi MT2.

Hnh2.24 Hnh 2.25 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t32/72 21. Nhn v gi S1. in p VG =? ________________________________________ 22.Quan st dao ng k. in p VMT2 by gi l bao nhiu? __________________ 23. TRIAC c dn khng? O C O Khng 24. Kim tra bng 2.2, cho bit ch vn hnh ca TRIAC ? __________________ Kt lun _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t33/72 BITP 2.7: IU KHIN PHA BN K TIN THNH TH NGHIM 1.XcnhkhimchTRIACACPOWERCONTROLtrongboardmch.Ni mch nh hnh 2.26. iu chnh bin tr R1 cc i theo chiu kim ng h. Hnh 2.26 2.XcnhkhimchDriver.NimyphtsngvongvokhiDriver (GEN)3.Ni knh 1 dao ng k vi VAC nh hnh v 2.26. iu chnh my pht sao cho VAC sng Sin, 18 Vpk-pk, Tn s 60 Hz (16.67 mS). 4.Di chuyn knh 1 ca oscilloscope n ti in tr R6 nh hnh 2.27 Hnh 2.27 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t34/72 5.Quan st dng sng ti. V dng sng quan st c: 6.Triac c dn khng? O C O Khng Giithch:________________________________________________________ __________________________________________________________________ __________________________________________________________________ 7.TRIAC ch iu khin mt bn k? O ng O Sai 8.Gc dn Triac trong trng hp ny xp x bao nhiu ? ___________________ 9.Quan st oscilloscope khi xoay chm R1 ngc chiu kim ng h. Gc dn ca TRIAC iu chnh c trong khong no? ______________________________ 10.Kt ni mch nh hnh 2.28. Kt ni my pht vi u vo mch DRIVER. Hiu chnh my pht sao cho VAC sng Sin, 18.0 VP-P, tn s 60Hz. Hnh 2.28 11. Knh 1 ca oscilloscope vn kt ni vi MT2 ca Triac, Nhn v gi S1 trong khi quan st oscilloscope. Hy cho bit dng sng quan st c: Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t35/72 Chuyn u ni ti cc cng G t +VGG n VGG. V dng sng trn MT2 12. T dngsngACthu ctrn,chngtacthkt lun g v hot ng ca Triac?____________________________________________________________ __________________________________________________________________ 13. Khi nh cng tc S1 ra, c hin tng g xy ra, hy cho bit nguyn nhn gy ra s ngng dn ca TRIAC ? ___________________________________________ __________________________________________________________________ Kt lun: ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t36/72 BO CO TH NGHIM BI TP 3: LM QUEN BOARD MCH TRANSISTOR CNG SUT V THYRISTOR GTOTRANSISTOR CNG SUT V MCH CHUYN MCH CNG SUT I - MC CH BI HC: -Nhn bit cc thit b bn dn chnh: Transistor, MOSFET,IGBT v GTO. -Hot ng ca cc khi mch. -SdngvtorakhimchDRIVER(DR)cungcpnguniukhinchocc khi mch bn dn. -S dng v to ra khi mch LOAD (DR) theo c tnh ti c trng.II NHC LI L THUYT - T bi th nghim ny tr v sau, sinh vin s c nghin cu v cc thit b cng sut c th iu khin tt v iu khin m thng s dng trong cng nghip.- Cc linh kin ny c hc trong gio trnh in t cng sut v mch in t.-thuccngtcdiukhin,ccnhsnxuttnglinhiuhnbng cch s dng ba transistor lng cc mc di dng Darlington (hnh 3.1) .Tuy nhin, thit b mi ny c tc chuyn mch rt chm. Hnh 3.1 -citinthigianchuynmch,nhsnxutthmccdiodevintr.Cu hnh ny cho php ta t c trng hp c lm t ba transistor lng cc c hFE tng cng ln n 750, m c th h tr cng 400A trong khi dn v hiu in th 1000V khi tt. -TransistorMOSFET(hnh3.2)chophpiukhincngsuttrungbnh.Nc thchuyndngcng70Avchuhiuinth500Vtitnsvtqu Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t37/72 20kHz vi tn hiu iu khin ca cng logic n.Tuy nhin, gi thnh sn xut ca loi transistor ny t hn transistor lng cc v Darlington. - Ch rng thc t MOSFET knh P khng c s dng trong in t cng sut v n khng th hot ng cng sut rt cao, v n kh ch to hn MOSFET knh N. Trong ti liu nay, chng ta ch nghin cu transistor knh N. Hnh 3.2: K hiu ca MOSFET knh N -Hnha)biudinkhiuchnhtrongMOSFET.Tuynhin,nhsnxutdngk hiu gm mt diode t gia cc mng v cc ngun, nh c biu din hnh b). Loi diode ny l bn cht bn trong ca vic ch to MOSFET Hnh 3.3: K hiu ca IGBT -BndntchuynmchcsdngthngdngnhttrongthctlIGBT (Insulated Gate Bipolar Transistor) (hnh 3.3). Loi transistor ny l loi cu hnh kt hp ca transistor lng cc v transistor hiu ng in trng. y l loi transistor c th chu dng ti c cng ln n 500A v hiu in th ln n 1200V ch s dng cng sut cng logic. Hn na, v gi thnh, nhng loi IGBT r hn transistor DarlingtonvMOSFET.LoiIGBTcthcdiodehockhngcdiodegiacc thu v cc pht. -MOSFETvIGBTcngsutlccloibndncngsuttiuchnhdiu khin nht. kch dn, in p cc G a vo ln hn in p ngng cc G v nh hnin p cc i ca thit b a vo. in p 10 n 15V thch hp nht kch dn MOSFET v IGBT. ngt cc loi thit b ny in p cc G phi di VGS(th) hoc CGE(th) nhng khng cao hn in p cc m. in p 0V dng ngt MOSFET Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t38/72 vIGBT.SnigiaccGvnguncxemnhmttnctchin kch dn transisor v khng c tch in ngt transistor. - Nh chng ta bit MOSFET cng sut c th iu khin dng ln n 70A khi dn in v chu in p 500V khi ngt, trong khi IGBT hot ng dng 500A v chu in p 1200V. Vic iu khin cng sut kiu ny vi cng sut nh c cung cp bi cng Logic l kt qu ht sc ngc nhin. -Tuynhinthucthigianchuynmchngn,phiiukhinMOSFETv IGBT vi mch iu khin dnh cho mc ch ny. Cc mch ny c ti u ha a nhanh in p cc G 10V thch hp kch transistor v tr v tht nhanh in p cc G 0V ngt transistor thch hp vn hnh thit b trong bi th nghim ny. Hnh 3.4: K hiu ca Thyristor GTO -kchdnhocngtcngtcbndncngsutrtcao,nndngthyristor GTO. V d, GTO c th chuyn mch ti dng c cng 850A v chu hiu in th4500V.NgoiraGTOcnlmtcngttincthiukhinmchuc mt in p ngc bng in p thun - Thyristor GTO l cng tc c th iu khin dng trong mc cng sut cao nht. kchdnGTOcncmtxungdngdngtccG.ngtGTO,cncungcp cho GTO mt xung dng m. Cn duy tr mt dng in cc G ln GTO duy tr trng thi hin ti. - K hiu GTO tng t nh k hiu Thyristor, nh xem trong ti liu Mch iu khin pha v Thyristor, ngoi tr du gch xin nh c thm vo. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t39/72 - Cc nguyn tc hot ng ca b chuyn i cng sut khng phi l mc ch bi hc ny,vic gii thch vn tt hot ng ca cng tt in cho php bn hiu hn v cngtccngsut.Cngtcinng ngtnhanhlloithitbmtchiu.Nc th chuyn in p DC cao thnh in p thp hn trong khi vn duy tr hiu sut tt nht. Hnh 3.5: Nguyn l hot ng transistor l tng Trong in t cng sut, cc cng tc in khng biu din cc hot ng l tng. Hnh 3.6: Nguyn l hot ng transistor thc t - Thi gian p ng sau khi a xung kch dn hoc ngt khng lin tc. Khi a vo dng B kch cc transistor v khng c dng chy qua trong transistor v in tr ti, transistor khng p ng trc khong thi xc nh. Khong thi gian gi l thi gian tr hon dn (turn-on delay time) td (ON). Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t40/72 - Sau transistor s bt u dn in tng dn trong vi s. Dng in s tng trn ti v transistor n gi tr bng VCC/R. Khong thi gian dng in tng n bin cc i gi l thi gian dng in tng (current rise time) tr. - Trong khi dng IC tng cc thu transistor, in p(VCE) qua transistor s gim t VCC n mc in p trng thi kch thp VVC (ON), nh trong hnh v. - in p qua transistor c th tnh xp x qua cng thc sau VCE = VCC RIC. Hnh 3.7: p ng thc t transistor khi bt u ngt - Nu ngt dng cc B, transistor khng p ng trc khong thi gian xc nh gi l thi gian tr hon tt (turn-off delay time) td(OFF). Khi , n s ngng dn in v dng IC qua n gim lin tc trong vi s cho n khi n hon ton ngng hn. Hnh v biu din in p VCE tng lin tc trong current fall time (t f). Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t41/72 Hnh 3.8: mt s loi diode thng gp -Khiudiodevdiodezener,cngnhnhngkhiudiodephtsngLEDv photodiodetrongbngmchDRIVER(DR),cthcquanstbngmch Power Transistor and GTO Thyristor. -BngmchPowerTransistorandGTOThyristorcchiathnh8khimch. NmkhichatransistorcngsutvmtkhichaThyristorGTO,khiDriver, khi mch Load Z. Hnh 3.9: S khi ca board mch th nghim Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t42/72 Hnh 3.10: s khi mch ngun (Driver) - Khi mch DRIVER (DR) c s dng cung cp tn hiu iu khin cho nhng mch in khc nhau. N c th c ni vi my pht sng vung thng qua hai cc c t hai pha ca k hiu GEN. -Mchiukhincchlybaselmtmchdngcungcptnhiuiukhincn thit cho thao tc bn dn cng sut thch hp trong khi phi m bo cch ly in p phnngunvmchli.tcinpdngDCngraAcakhimch Driver, s dng jumper ni cc A vi ngun dng DC (ngun 0 n 10V). Ngc li vi ngun m. Ngoi ra cc A cng c th to sng vung. thu c tn hiu sng vung, my pht sng vung phi c ni vi ng vo mch iu khin (GEN) vphotodiodebtudnvcungcptnhiuntngkkuychi.Sautng khuychicungcptnhiucnthitchuynmchtransistorlngcctng ng ra. Cc A iu khin tnh dn bt k linh kin in t cng sut no trong khi mch Hnh 3.11 S khi ca khi ti - Khi mch Load (Z) cho php cu hnh khi ti tiu biu. Trong mch Load (Z) c 3 in tr, 1 cun dy v 3 diode wheeling. Khi Load (Z) c cu to ni ti bt k vo mt trong nm khi mch ca bi th nghim. Hai cc ng ra ca khi ti c k hiu bi k t B v C Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t43/72 BI TP 3.1: TNG QUAN V CC KHI MCH TIN TRNH TH NGHIM 1.Quanstkhimch,intncckhimchctrnboardmchvthnhphn iu khin chnh trn tng khi mch vo bng bn di. Trong cc khi mch khi no c diode pht quang (photodiode), diode zener? Nu c nh du X vo ct tng ng, nu khng c nh du OSTTTn khi mch Tn linh kin iu khin chnh Photodiode Zener diode 2.Ninguncungcp15VchoboardmchvoccPOWERINPUTtrnboard. Lc ny khng bt ngun in. Dng chc nng o in tr ca ng h vn nng tr li cc cu hi sau. 3.C phi tt c cc cc 15V u c ni vi nhau khng ? OC OKhng 4. C phi tt c cc cc A u c ni vi nhau? O C O Khng 5. C phi tt c cc cc C u c ni vi nhau? O C O Khng 6.Bt ngun in. Dng chc nng o in p DC ca VOM. o hiu in th DC ca cc 15V t ti khi mch MOSFET. Ghi li hiu kt o c. V+15V=____________V 7.Lm li cch o cho 5 loi khi mch khc. Kt qu c ging trong bc 6 ? O C OKhng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t44/72 BI TP 3.2 TNG QUAN V KHI MCH DRIVER TIN TRNH TH NGHIM 1.Tt ngun. Ni cc POWER INPUT ca bng mch vi ngun cp 15V. Lc ny ng bt ngun. 2.Xc nh v tr khi mch DRIVER (DR). S dng chc nng o Ohm ca ng h vn nng, xc nh gia hai cc pha tri ca mch iu khin c lin tc hay khng v bt c cc no t bn phi ca mch. Chng c lin tc khng ? OC OKhng 3.Hai pha ca khi mch Driver c cch ly in hon ton khng ? OC OKhng Hnh 3.12 : Khi mch ngun 4.Btngun.tjumpergiangundngDCvngra(ccA)cakhimch DRIVER (hnh 3.12). Trn b chn , xoay nm hiu chnh POSITIVE SUPPLY ht c theo chiu kim ng h. S dng chc nng o in p DC ca VOM o in p ng ra mch iu khin VA? __________ 5.Xoay nm iu chnh POSITIVE SUPPLY ht c theo ngc chiu kim ng h . Trong khi quan st in p ng ra ca mch iu khin Driver. in p o c c thay i t 0 n Vout, max khng ? OC OKhng Hnh 3.13 : Khi mch ngun. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t45/72 6.Tho jumper v t gia ngun m DC bin i v ng ra (cc A) ca khi mch DRIVER(hnh3.13).Trnbchn,xoaynmhiuchnhNEGATIVE SUPPLY ht c theo chiu kim ng h. S dng VOM ch DC o in p ng ra mch iu khin VA ? ______________________ 7.Xoay nm NEGATIVE SUPPLY ht c theo ngc chiu kim ng h. Trong khi quanstinpngracamchiukhin.inpoccthayit0 n -Vout, min khng ? OCOKhng 8.Ni my pht tn hiu vi ng vo mch iu khin (GEN). S dng dao ng k, iuchnhmyphtsaochothu csngvung+10/-10V,10kHz ng vo ca mch GEN. 9.Thit lp mt mch vi tng cng sut c cung cp bi ngun n cc nh hnh 3.14.SdngdaongkningracakhiDriver.Vdngsngquanst c: Hnh 3.14 10. in p ng ra ca mch iu khin bng bao nhiu khi ng vo l +10V? Vout = __________V 11. in p ng ra ca mch iu khin bng bao nhiu khi ng vo l -10V? Vout = __________V Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t46/72 12. Thit lp mch vi tng cng sut c cp bi ngun lng cc nh hnh 3.15. Hnh 3.15 : Mch ngun. 13. Quan st tn hiu ng ra ca khi mch Driver: 14. in p ng ra ca mch iu khin bng bao nhiu khi ng vo l -10V? Vout = __________V 15. in p ng ra ca mch iu khin bng bao nhiu khi ng vo l +10V? Vout = __________V Kt lun _______________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t47/72 BI TP 3.3: LM QUEN VI KHI MCH LOAD (Z) TIN TRNH TH NGHIM 1.Ttngun.NiccPOWERINPUTcabngmchvinguncp.Lcny ng bt ngun. Hnh 3.16: Khi s ti. 2.Trong khi mch LOAD (Z), thit lp mch nh hnh 3.16. t dng c o in trtrnhaingvo(BvC)cakhimchLOAD(Z).Gitrocbng bao nhiu? Rload = ___________ Hnh 3.17 : Khi s ti 3.Trong khi mch LOAD (Z), thit lp mch nh hnh 3.17. t dng c o in tr trn hai ng vo ca khi mch LOAD (Z). Gi tr o c bng bao nhiu? Rload = ___________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t48/72 BI TP 3.4:TRANSISTOR CNG SUT LNG CC TIN TRNH TH NGHIM 1.Ni cc POWER INPUT ca bng mch vi ngun cp 15V. Lc ny ng bt ngun. Hnh 3.22 2.Thit lp mch nh hnh 3.22. lm c iu , t mt jumper ni R1 ni tip R2, dng jumper th 2 on mch cun cmL1. Trong khi mch DRIVER, t t 1 jumper gia cc dng ca ngun v cc ng ra A. Sau niccAcakhimchDRIVER(DR)viccAcakhimchBIPOLAR TRANSISTOR. Sau cng, ni cc B v C ca khi mch LOAD (Z) vi cc B v C ca khi mch BIPOLAR TRANSISTOR. 3.Trn b chn , xoay nm dng ca ngun iu khin ht c ngc chiu kim ng h thu c in p 0V. Sau , bt ngun cung cp. 4.Dng VOM ch DC o in p trn in tr R3 cc B ca Transistor. Tnh dng IB? IB =5.Dng VOM ch DC o in p hai cc C v E ? VCE = 6.Xoay nm dng ca ngun iu khin theo chiu kim ng tng in p cc i. 7.Trn knh 2, in p gia cc C v E ca transistor lng cc bng bao nhiu? VCE(ON) = _________ mV. 8.Dng ngun iu khin dng, bin i vi ln in p cung cp t 0 n 10V trong khi quan st tn hiu. 9.iuchnhnguniukhindngthucinpVCEl1V.DngIB bng bao nhiu? IB = ___________________mA. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t49/72 BI TP 3.5: MOSFET & IGBT CNG SUT TIN TRNH TH NGHIM 1.NiccPOWERINPUTcabngmchvinguncungcp15V.Lcny ng bt ngun cung cp. Hnh 3.23 2.Thit lp mch nh hnh 3.23. lm c iu , t mt jumper ni R1 ni tip R2, dng jumper th 2 lm on mch c cun cm L1. Trong khi mch DRIVER (DR), t t 1 jumper gia cc dng ca ngun v ng ra cc A.SauniccAcakhimchDRIVERvccAcakhimch MOSFET . Sau cng, ni cc B v C ca khi mch LOAD (Z) vi cc B v C ca khi mch MOSFET . 3.Trn b chn , xoay nm dng ca ngun iu khin ht c ngc chiu kim ng h thu c in p 0V. Sau , bt ngun cung cp. 4.Trnknh2,inpgiaccmngdrainvccnguncaMOSFETlbao nhiu?VDS =_______________V 5.Xemktqubc4,bncthxcnhMOSFETngtvngnkhngcho dng drain chy qua khng? O CO Khng 6.XoaynguniukhindngtheochiukimnghsaochoinpccGMOSFET tng n khi MOSFET dn. 7.in p gia cc mng drain v cc ngun va MOSFET bng bao nhiu?VDS (ON) = _____________ V 8.Xem kt qu bc trc, bn c th xc nh MOSFET bt v cho dng mng drain chy qua khng ? O CO Khng 9.Dng VOM ch DC, o in p trn in tr R1 pha cc G. Dng cc G xc nh bng cch ly in p o c chia cho in tr R1.IG =_____________________mA Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t50/72 10.Dng ngun iu khin dng, thay i vi ln in p t 0 n 10V, trong khi quan st k tn hiu. 11.CphiMOSFEThotngnhmtcngtcciukhinbidngG khng? O C O Khng Hnh 3.24 12.Tt ngun. Thit lp mch nh hnh 3.24 (ch thay MOSFET bng IGBT). 13.Trn b chn , xoay nm dng ca ngun iu khin ht c ngc chiu kim ng h thu c in p 0V. Sau , bt ngun cung cp. 14.Trn b dao ng k. in p gia cc C v E ca IGBT l bao nhiu?VCE =_______________V 15.XoaynguniukhindngtheochiukimnghsaochoinpccG IGBT tng n 10V. 16.in p gia cc C v E ca IGBT l bao nhiu?VCE (ON) =_______________V 17.Tng t cu 9 xc nh dng G. IG =_____________________mA 18.Bin i vi ln in p gia 0 n10V, quan st tht k tn hiu 19.C phi IGBThot ng nh mt cng tc c iu khin bi dng G, ngha l dn inkhi cung cp in p 10V cho dng G v ngt in khi khng cung cp in p cho dng G khng? O C O Khng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t51/72 BI TP 3.6:THYRISTOR GTO TIN TRNH TH NGHIM 1.NiccPOWERINPUTcabngmchvinguncungcp15V.Lcny ng bt ngun cung cp. Hnh 3.25 2.Thit lp mch nh hnh 3.25. lm c iu , t mt jumper ni R1, dngjumperth2lmonmchccuncmL1.Trongkhimch DRIVER, t 1 jumper gia cc dng ca ngun v ng ra cc A. Sau ni cc A ca khi mch DRIVER vi cc A ca khi mch Thyristor GTO. Trong khi mch THYRISTOR GTO, t jumper ni ni cc B n +15V. Sau cng, niccBvCcakhimchLOAD(Z)viccBvCcakhimch Thyristor GTO. 3.Trn b chn , xoay nm dng ca ngun iu khin ht c ngc chiu kim ng h thu c in p 0V. Sau , bt ngun cung cp. 4.Trn b dao ng k, trn knh 2, in p gia anode v cathode ca Thyristor GTOl bao nhiu?VAK =_______________V 5.Xem kt qu bc 4, bn c th xc nh Thyristor GTOngt v ngn khng cho dng IA chy qua khng ? O CO Khng 6.XoaynguniukhindngtheochukimnghsaochoinpccG Thyristor GTO tng n 10V. 7.in p gia cc anode v cathode ca Thyristor GTObng bao nhiu?VAK (ON) = _________________V 8.Xem kt qu bc 7, bn c th xc nh Thyristor GTO dn v cho dng IA chy qua khng ? O CO Khng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t52/72 9.Tng t cu trn, xc nh dng G ca GTO.IG =_____________________mA 10.Dng ngun iu khin dng, thay i vi ln in p t 0 n 10V, trong khi quan st tn hiu. 11.C phi Thyristor GTO hot ng nh mt cng tc c iu khin bi dng G khng? O C O Khng Cp li dng cc G. Gim in p ca ngun dng cho n khi Thyristor GTO tt. Ghi li gi tr dng in lm cho Thyristor GTO tt. IA =______________A Hnh 3.26 12.Xoaynmiukhinngunmhtctheongcchikimngh.G jumper m ni ng ra dng (+10V) vi cc A v ni ng ra m (-10V) vi cc A a xung m vo cc G Thyristor GTO. 13.in p cc cc Thyristor GTObng bao nhiu?VG =_____________________V 14.Dng jumper, bin i vi ln in p t +10V n 10V, cp khng c nh vi xung m v dng n cc G Thyristor GTO trong khi quan st tn hiu 15.Thyristor GTO c hot ng nh cng tc c th iu khin m bt khi n nhn xung dng dng cc G v tt khi nhn xung dng m cc G khng? O CO Khng Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t53/72 BI TP 3.7: THI GIAN CHUYN MCH & ST P DN IN TIN TRNH THC HIN 1.Ni cc POWER INPUT ca bng mch vi ngun cung cp 15v. Lc ny ng bt ngun cung cp. Hnh 3.28 2.Thit lp mch nh hnh 3.28. 3.Bt ngun. Dng my pht sng, iu chnh sng vung, tn s20 kHz, bin +10/-10V. 4.Ni knh 1 ca dao ng k quan st dng IC. 5.Dng VOM ch DC, o in p VCE. Quan stlc in p VCE gim t 15 n 0V th dng in trong transistor c tng khng ? O C O Khng 6.Trong lc transistor ang dn quan st tn hiu trn knh 1 (R4). 7.Khi transistor dn, dng IC tng n bin cc i trong thi gian bao lu (iu chnh time base quan st r hn)?Current tr = __________ nsec 8.Ngng cp tn hiu vo chn B transistor tt (tho mi ni A ra, VCEtng t 0 n 15 V). 9.Khi transistor tt bn c th xc nh rng chuyn mch din ra tc thi, ngha l tf = 0 sec khng? O C O Khng 10.Khitransistortt,dngICthayitbinccixungbincctiu trong thi gian bao lu? Current tf = __________________nsec 11.CplingunchoccBTransistor.Nimyphtsngn2ccCvEca Transistor quan st in p qua transistor khi n ang dn in. o in p trng thi dn ca transistor.VCE (ON) =______________________V Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t54/72 Hnh 3.29 12.Cthxcnhtransistorpngnhanh(t(ON) 0.5sec)? O ng O Sai 8. Ni thm phn t R1C1 vomch nh hnh 4.3. Hnh 4.3 9. Ni dao ng k quan st tn hiu trn knh 1 V dng sng quan st c: 10. Ln lt ni dao ng k quan st tn hiu VCE v dng IC chy qua transistor

Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t60/72

11. Hnh ca bc th 9, 10 cho bn thy tc thi tn hiu iu khin (dng IB) v p ng ca n (dng IC v p VCE). Vi mch hnh 4.3 cho php chng ta gim ng k thi gian tr hon ngt ca transistor lng cc?OngO Sai 12. Ni mch nh hnh 4.4 Hnh 4.4 13. Ni dao ng k quan st tn hiu trn knh 1 V dng sng quan st c: 14. Trong khi mch DRIVER (DR), chuyn jumper tn hiu chuyn mch i qua t lng cc n n cc ri n lng cc. Lp li thao tc ny trong khi quan st dao ng k. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t61/72 15. Bn c th ni rng dng mt p ng lng cc cho php to ra nhng nh dng m cao hn? O ng O Sai 16. Ln lt ni dao ng k quan st tn hiu VCE v dng IC chy qua transistor 17. Trong khi mch DRIVER, chuyn li jumper tn hiu chuyn mch i qua t lngccnnccrinlngcc,nhbnlmtrongbc14.png lngccchophpgimthigianchuynmchngtcatransistor?O ngO Sai 18.TrongkhimchDRIVERthitlpcungcptnhiulngcc.Thitlp time base quan st tn hiu khi transistor ngt. o thi gian dng Ic i xung (tf).tf = nsec 19. Quan st nhng tn hiu khi transistor m. o thi gian i ln (tr) ca dng IC.tr= ..nsec Kt lun: _______________________________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t62/72 BI TP 4.2: TRANSISTOR CNG SUT DARLINGTON TIN HNH TH NGHIM 1.Ni cng POWER INPUT ca board mch vi ngun cp 15V. ng m ngun cp vo lc ny. Hnh 4.5 2.Ni mch nh hnh 4.5 3.Bt ngun. Dng my pht sng, iu chnh sng vung, tn s 20 KHZ, bin +10/-10V4.Chnh knh 1 ca dao ng k bn c th quan st dng IB (o p qua in tr R3) ti cc B ca Darlington. 5.Quansttnhiutrnknh1.yldngIB kchtibasemvngt transistor. V dng sng quan st c: Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t63/72 6.Ln lt s dng dao ng k c th quan st dng IC v p VCE ca transistor Darlington. V dng sng quan st c. 7.Hnh trc cho bn thy tc thi tn hiu iu khin (dng IB) c cung cp i vitransistorv p ngcan(dngICvpVCE).Xemxthnhny,bnc th ni rng thi gian chuyn mch ca transistor Darlington ln?O ng O Sai Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t64/72 Hnh 4.7Hnh 4.8 8.Kt ni dao ng k quan st dng IB (hnh 47). V dng sng quan st c: 9. Ln lt s dng dao ng k c th quan st dng IC v p VCE ca transistor Darlington. V dng sng quan st c: 9.Hnhtrcchothytcthitnhiuiukhin(dngIB)vpngcan (dngICvpVCE).Xemxthnhny,sxuthincanhngnhdngcho Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t65/72 phpchngtagimngkthigiantrhonngttd(OFF)catransistor Darlington? O ng O Sai Hnh 4.9 10. Ni mch nh hnh 4.9. Kt ni knh 1 dao ng k o dng IB (hnh 4.9). V dng sng quan st c: 11. Trong khi mch DRIVER, chuyn jumper tn hiu chuyn mch t lng cc n n cc ri n lng cc. Lp li thao tc trong khi quan st dao ng k. 12. Tham kho phn quan st lm trong bc 11, bn c th ni rng vic dng mt p ng lng cc cho php to nhng nh dng cao hn? O ngO Sai 13. Ln lt ni knh 1 v 2 ca dao ng k, quan st dng IC v p VCE. 14. Trong khi mch DRIVER (DR), chuyn li jumper tn hiu chuyn mch t lng cc n n cc ri n lng cc, nh bn lm trong bc 11. p ng lng cc cho php gim thi gian chuyn mch ngt ca transistor Darlington?O ng O Sai 15. Bo m rng DRIVER c thit lp cung cp tn hiu lng cc. Thit lp time base ca dao ng k quan st tn hiu khi transistor Darlington ngt. o thi gian i xung tf ca dng IC.tf =nsec 16. Chnh dao ng k, quan st nhng tn hiu khi transistor m. o thi gian i ln tr ca dng IC.tr = nsec Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t66/72 BI TP 4.3:THYRISTOR GTO TIN HNH TH NGHIM 1. Ni cc cng POWER INPUT ca board mch n ngun cp. ng m ngun cp ti lc ny.

Hnh 4.10Hnh 4.11 2. Mc mch nh hnh 4.10. 3. M ngun. iu chnh my pht sng vung, tn s 20KHZ, bin +10/-10V. Cp tn hiu va to c vo ng vo khi Driver. 4. Chnh knh 1 ca dao ng k bn c th quan st dng IG (o t p qua in tr R3) ti cng ca thyristor GTO. 5. Tn hiu s cung cp cho cng GTO mt tn hiu sng vung n cc dng?O ng O Sai 6. Ln lc ni dao ng k quan st IAK v VAK (hnh 4.11) 7. GTO s chuyn mch bnh thng (m v ngt tt)?O ng O Sai 8. o p on-state VAK(ON) ca thyristor GTO. VAK(ON) = .V 9. B sung tn hiu truyn n cng bng cch di chuyn jumper trong khi mch tn hiu chuyn mch i t n cc n lng cc. 10. Bn quan st thy thyristor GTO m v ngt tt?O ng O Sai Hnh 4.12 Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t67/72 12. Trong khi quan st dao ng k, ni in dung C1 song song vi in tr R2, nh hnh 4.12. 13. Bn quan st thy thi gian chuyn mch ngt ca GTO gim?O ng O Sai Hnh 4.13 17. Kt ni dao ng k nh hnh 4.13 quan st li dng IG. V tn hiu quan st c Kt lun: _______________________________________________________________________________________________________________________________________________________________________________________________________________ Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t68/72 BI TP 4.4: MOSFET CNG SUT TIN HNH TH NGHIM 1.NicccngPOWERINPUTcaboardmchnnguncp15V.ngm ngun cp ti lc ny.

Hnh 4.14 Hnh 4.15 2. Ni mch nh hnh 4.14.3.Mnguncp.iuchnhmyphtsngvung,tns20kHz,bin+10/-10V. Ni tn hiu va to c n ng vo khi Driver. 4. Chnh dao ng k quan st p cng ngun VGS v p VDS trong qu trnh m MOSFET (hnh 4.14).5. V dng sng quan st c:

Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t69/72 6. Chnh dao ng k bn c quan st dng ID (o p trn in tr R2) trong qu trnh MOSFET m. V dng sng quan st c:

7. Tham kho hnh pha trc, c lng thi gian tr m td(on) ca MOSFET.td(on) =.. nsec 8. Trong khi mch DRIVER, chuyn jumper m tn hiu chuyn mch i qua t lng cc n n cc ri n lng cc. Lp li thao tc ny trong khi quan st dao ng k. 9. Bn quan st du hiu thay i tn hiu m khi chuyn mch c iu khin vi tn hiu lng cc tt hn vi tn hiu n cc? O ng O Sai Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t70/72 BI TP 4.5 IGBT TIN HNH TH NGHIM 1.NicccngPOWERINPUTcaboardmchnnguncp15V.ngm ngun cp ti lc ny. Hnh 4.18Hnh 4.19 2. Ni mch nh hnh 4.18.3.Mnguncp.iuchnhmyphtsngvung,tns20kHz,bin+10/-10V. Ni tn hiu va to c n ng vo khi Driver. 4. Chnh dao ng k quan st p VGE v p VCE trong qu trnh IGBT m. 5. V dng sng quan st c: 6. Trong khi mch DRIVER, chuyn jumper m tn hiu chuyn mch i qua t nccnlngccrinncc.Lplithaotcnytrongkhiquanst dao ng k. Ool llea hacoq doo tht oqhlem 7leo ta ecoq saotB mn iu khin t ng, khoa in in t71/72 7. Bn quan st du hiu thay i tn hiu m khi chuyn mch c iu khin vi tn hiu lng cc tt hn vi tn hiu n cc?Ong OSai 8. Bo m rng mch li c thit lp cung cp tn hiu chuyn mchn cc. 9. Chnh dao ng k quan st VGE v VCE trong qu trnh IGBT ngt. V tn hiu quan st c: 10.Thamkhohnhbc5,clngthigianilntrcaqutrnhIGBTm. tr = nsec 11.Dngchcnngvoltkdccanghovnnng,opcollector-emitter VCE(on) trong qu trnh IGBT dn. VCE(on)=.. V Kt Lun: ____________________________________________________________________________________________________________________________________________________________________________________________________________