Gia thiet mach o·xac l~ ,dong qua Lmlien tuc mach o·ch d9 dong lien tuc va cac Iinh kien laIytuong.. Ve gian d6 ap ng6 raVovao hlnh 2c va tinh tri trung blnh di~nap nay.. Tfnh tri trung
Trang 1Mon hoc CO' 560 £)i~n Tw Cong SuAt
HQcky/namhQc 2 2019-2020
TRU'ONGDH BAcH KHOA - DHQG-HCM Ma rnon hoc EE2021
KHOA i=: =-: :c=-.: : :_:_:;:-= +==-= :_:_ -~ ~ - - -1
h60i ILPgng 90 phut
Ghi - KHONG SLr dvng taiMu
cnu: - DU'Q'c SLr dvng vi t Jt chi ho/fl C viet meu a ve hinh
- No lai a~thi cun v&i bai lam
Can 1 (2d): Cho b9 SMPS (Switching Mo e Power Supply) each ly dang Fly ack (Hinh la) c6 n uon
DC ng6 vao c6 gia tr] la Vd= 24V, tai R = 50 va c6 cac tho g s6 nhu sau: NdN2 =2, Lm= 3 0IlH, C =
200IlF , tAn s6dong cilt kh6a ban d§.nT lafsw= 50 kHz Dien ap ng6 ratren tai duoc di~ k ien d~c6 trj
trung blnh Vo= 12V Gia thiet mach o·xac l~ ,dong qua Lmlien tuc (mach o·ch d9 dong lien tuc) va cac Iinh kien laIytuong
1 Tinh ty s6 dong (ti s6 di~u che) D dn thiet, (O.Sd)
2 Ve gian d6 dong qua Lm vao hlnh 1b (rng v6"ity s6 d n D da Hnh 6" diu 1(O.Sd), va tinh cac gia tri dong iLml6"nnhftt va nho nhftt (ld)
Can 2 (2d):Cho b9 bi~n d6i di~ ap m9t chi~u d~ngdao d n nhu hlnh 2a Transistor TI va T2dU'Q'cdi~
khi~n kfch d6i nghjch v6"i Ans6 d ng cilt kho g d i va thay d i ty s6 d n (ti s6 di~ ch~) D B9 dao dong c6 cac thong s6 nhu sau: Ap ngu6n: Vd= 200V, Tai R=IO, L = O.OIH, E= 100V, tAns6d n cilt kh6a: fsw= 1kHz
Xet m~ch 6" ch~ d9 xac l~p v6"iti s6d n D =0.4
1 Ve gian d6 xung di~u khi~n d6ng ngilt transistor TI, T2(mg v6"ity s6d n da cho vao hlnh 2b (O.Sd)
2 Ve gian d6 ap ng6 raVovao hlnh 2c va tinh tri trung blnh di~nap nay (O.Sd)
3 Tfnh tri trung blnh dong tai iova ve gian d6dong di~n nay vao hlnh 2 , bi~t d9 dQ'ns6ng cua dong tai
iola L1io~ SA (O.Sd)
4 Ve gian d6 dong qua transistor Tl vaT2vao hlnh 2e (O.Sd)
Can 3(2d): Cho b9 nghich Iuu ap m9t pha nhu hlnh 3a, di~u khi~n ki~u di~u r9ng xung (PWM) Xung kich cho cac transistor t~o ra b~ng c ch so sanh s6ng man V t r ; v6"is6n di~u khi~ V co n t r o l trong m~ch di~u khi~n, va cac s6ng nay c6 d?:n nhu hlnh 3b Tai c6tri s6: R=50, L=100mH Ngu6n DC cu g cftp cho b9 nghjch Iuu: Vd =350V
I Hay ve tren hlnh 1c d~ng xung kfch cac c~p transistor Tl T2 va T3, T4 (O.Sd), va tren hlnh Id d~ng
di~n ap ng6 ra V o (ghi r6 cac m(rc di~n ap tuong (rng) (O.Sd)
2 Gia thi~t s6ng mang V t r ; c6 tAns6 rftt l6"nhO'n s6ng di~u khi~n V control· N~u mu6n hai b~c 1 cua di~n ap ng6 ra Vo c6 trj hi~u dl,lng V o l rlll s =nov va tAns6Ji = 50Hz, thl tAns6 va bien d9 cua s6 g V co ntr o l
phai la bao nhieu, bi~t bien d9 cua s6n man la V t r i= 12V (O.Sd) Tfnh tri hi~u dl,lngcua hai b~c 1 Clla dong tai i oIllCnay (O.Sd)
Trang 2CaD 4 (2d): Cho b<)nghich luu ap 3 pha nhu hinh 4a Dien ap DC eung dp eho e~u Vd=2S0V Tai 3 pha can bang: R=sn, L=lOOmH, dfiu sao (Y).B<)nghich luu duoc di~u khien thea kieu s6ng vuong ( s i x -step i nv e rt e r) voi ehu ky T, = 20ms
1 Ve cac xung kich dn thiet eho cac transistor TI-7T6 vao d thi tren hinh 4b (O.5d) Ve dang di~n ap pha tai V Anvao hlnh 4e (O.5d)
2 Tinh tr] hieu dung hai b~e 1 cua di~n ap pha tai (O.5d), ttl' do tinh ra tr] hi~u dung hai b~e 1 cua dong pha Uti(O.5d)
CaD 5 (2d): Xet b<)bien d6i di~n ap xoay chieu 1 pha nhu hinh Sa Dien ap xoay chieu V seung efip eho b9 bien d6i e6 dang hinh sin, t~n s6 SOHz,tr] hi~u dung 220V
1 Trong truong hop tai cua b<)bien d6i la R= Ion va bi~tg6e kich eho cac SCR cua b<)bi€n d6i 1a
a=J[ /3 Hay ve d~ng s6ng dong tili it(O.5d) vao hinh Sb Tinh eong sufit tren tili(O.5d) va h s6 eong sufit eua ngu6n khi d6 (O.5d)
2 Trong truo'ng hQ"ptili eua b<)bi~n d6i 1aR = Ion mAcn i ti~p vai L = 20mH, d€ e6 th€ di~u khi€n dUQ"edi~n ap ng5 ra, g6e kich a t6i thi€u eua cae SCR 1a bao nhieu? (O.5d)
(b) (a)
Hinh 1
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M SSV : H <;> va te n SV : , , , , ' , " , " , , ', , Trang 4 / 6
Trang 5TRVONG DAI HOC BAcH KHOA
KHOA BI EN - BI E N rtr
BO M O N CUN G cAp DI EN
PH l) Ll)C cH u AN DAu RA M O N HQC
T UON G UNG v o r D E TH I
Mon thi: CS Di ~n t if co g s u i - EE 20 21
Ngay thi: 29 / 07 / 2 2 - Thai hrong: 90 phut
D ~ th i s 6 :
N Qi dun g di u h o i tre n d~ th i N Q i d un g chu a n d§ u ra m fi n h oc
Cau 1 (2d ) : Ch bQSMPS (Switching Mode Power Supply) each ly dan gFly a k (Hinh la) co
nguon DC ngd vao co gia tri laVd= 24V, UtiR= sova co cac tho g s6 nhir sau:N IIN2 =2, Lm=
3 00IlH , C = 200IlF , tk s6d n c~t khoa ban d§n T la fsw = SOkHz Dien apngo ratren tai diroc
dieu khi~n d~ co tri trung binh Vo= 12V Gia thi6t mach axac lap, d n qua Lmlien tuc (mach ach6
dQ do g lien tuc) va cac linh kien la lytuong
Cau 1.1 Tinh ty so d n D can thiet L.OA.l Tinh toan cac dai hrong nhir tri
hieu dung, ti trung binh, p an
tch Fourrier cho cac dang song ap
va d n Cau 1.2 Ve gian do dong qua Lm vao hinh 1b L.O.3.1 Xay dung c c giaJ?-do ap va d n
img voi ty s6d n D da tinh acau 1, tail lin? ki~n, ng~on cua cac b~
vatinh c c gia tri dong iLmIan nh<1t bien doi cong suat thea thong so
vanh6 nh<1t diSu khi~n
C au 2 : (2d )Cho bQbien doi di~n ap mQt chieu d~n dao d n nhu hinh 2a Transistor TI vaT2duQ'C
diSu khi~n kich d6i nghich thea ki~u diSu rQng xung (PWM) v6i tk s6 dong c~t kho g d6i va thay
d i ty s6 dong D BQdao do g co cac th ng s6 nhu sau: Ap ng 6 : Vd = 200V, Tai: R=1 , L =
O.OIH,E = 100V, t&ns6 d ng c~t khoa: fsw = 1kHz Xet m~ch ach6 dQ xac l~p v6i ti s6 dong D =
0.4
Cau 2.1 Ve gian do xung dieu khien dong L.O.S.2 Nb vfrng va ap d\lllg cac phuong
ng~t transistor T I,T2Ung v6i ty s6 phap diSu khi~n xung cho bQbi6
dong da cho vao hinh 2 d6i DC-DC
Cau 2.2 Ve gian do ap ngo ra Vovao hinh 2c L.O.3.1 -Nhu tren
-va tinh tri trun binh di~n ap nay L.OA.l -Nhu ten
-Cau 2.3 Tinh tri trung binh dong tai iova ve L.O.3.1 -Nhu tren
-gian d6 dong di~n nay vao hinh 2d, L.OA.l -Nhu tren
-bi6t dQ dQ'llsong cua dong tai iola
~io ~ SA
Cau 204 Ve gian do dong q a transistor TI va L.O.3.1 - Nhu tren
-T2 vao hinh 2e
Ca u 3: ( 2d)Cho bQ nghich lUllap mQt pha nhu hinh 3a, diSu khi~n ki~u diSu rQng xung (PWM)
Xung kich cho cac transistor t~o rab~ng cach so sanh son man V t r i v6i song diSu khi~n V ca ntra l
trong m~ch diSukhi~n, va cac son nay co d~ng nhu hinh 3b Tai cotri s6: R=SO, L=100mH
Ngu6 DC cu g c<1Pcho bQ nghich lUll:Vd= 3S0V
Cau 3.1 Hay ve tren hinh 1c d~ng xung kich L.O.5.3 Nb vfrng va ap d\lng ca
cac ci;iptransistor Tl, T2 va T3, T4 phucmg phap diSu 10i6~ xung cho
( O.5d ) ,vatren hinh 1d d~n di~n ap bQn hich lUllvabien tan
ngora V a (ghi ro cac muc di~n ap
tuong Ung)
MSSV: HQ va tensv: Tr a g 5 / 6
Trang 6Cau 3.2 Gia thiet song mang V t rico tan so rat L.OA.1 - Nhir
tren-IOnhan song di~u khien V control NSu muon hai b~e 1 ella dien ap ng5 ra V o
co tri hieu dung V ol rm s = 220V va t§.ns6jj = SOHz , thi t§.n s6 va bien d<)ella song V contro lphai la bao nhieu, biet bien d<)ella song mang la V » =
12V.Tinh tri hieu dung ella hai bac
1 ella dong tai i ,luc nay (O.5d).
pha can bang: R=SO , L=100mH, dftu sao (Y) B<)nghich hru diroc di~u khi~n thea kieu song vuong
(six-step inverter) , va ehu ky T = 20ms
Cau 4.1 Ve cac xung kieh can thiet eho cac L.O.S.3 Nfun virng va ap dung ca
transistor Tl-7T6 vao d6 thi tren phuong phap dieu 10i~~ xung eho hinh 4b Ve dang dien ap pha tai V An b<)nghich hru va bien tan
vao hinh 4e
0 Cau 4.2 bi~u thue tinh tri hi~u dVng hai b~e 1SU dung phan tieh Fourier de tim L.OA . 1 - Nhtr tren
-eua di~n ap pha tai (O 5d), til do tinh
ra tri hi~u dVng hai b~e 1 eua dong pha teE(O 5d)
Call 5: (2d) Xet b<)biSn d6i di~n ap xoay ehi~u 1 pha nhu hinh Sa.Di~n ap xoay ehi~u V seung eftp
eho b<)biSn d6i co d~ng hinh sin, t§.n s6 SOHz ,tri hi~u dVng 220V
Cau S.1 Trong truemg hgp tai eua b<)bien doi L.O.3.1 - Nhutren
la R = 100 va biSt goe kieh eho cae
Danh gia cae Ms6 phAm ehftt nhu SCR ella b<)biSn d6i la a =:rr / 4 L.OA.3
Hay ve d~ng song dong tai itvao Ms6 eong suftt, THD, v.v eho hinh Sb. Tinh eong suftt tren tai va M cae b<)biSn d6i eong suM
s6 eong suftt ella ngu6n V s
Cau S.2 Trong truemg hgp tai ella b<)bien doi L.O.2.2 Phan tieh ho~t d<)ng ella cae b<)
la R= 100 m~e n6i tiSp v&i L= ehinh luu, b<)biSn d6i ap m<)t
0 20mHdi~n ap ng5 ra, d~ co th,~goe kiehdi~u khi~n dUQ'ea t6i thi~u ehi~u, b<)nghieh luuap xoay ehi~u thea thon, b<)big s6Sn d6idi~u
ella cae SCR la bao nhieu? khi~n
- - - - - - - -
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Vi- TT Vi If
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