THI CUOI Mon hoc KY HQc ky/nam hQc Ngay thi 2019-2020 29/7/2020 CO'560 £)i~n Tw Cong SuAt TRU'ONGDH BAcH KHOA - DHQG-HCM Ma rnon hoc EE2021 KHOA i=: =-: :c=-.: : :_:_:;:-= +==-=:_:_ -~ ~ h60i ILPgng 90 phut Ghi cnu: - KHONG SLr dvng tai Mu - DU'Q'cSLr dvng vitJt chi ho/flCviet meu - No lai a~thi cun v&i bai lam ae ve hinh Can (2d): Cho b9 SMPS (Switching Mode Power Supply) each ly dang Flyback (Hinh la) c6 nguon DC ng6 vao c6 gia tr] la Vd = 24V, tai R = 50 va c6 cac thong s6 nhu sau: NdN2 = 2, Lm = 300IlH, C = 200IlF, tAn s6 dong cilt kh6a ban d§.n T la fsw = 50 kHz Dien ap ng6 tren tai duoc di~u khien d~ c6 trj trung blnh Vo = 12V Gia thiet mach o·xac l~p, dong qua Lm lien tuc (mach o·ch~ d9 dong lien tuc) va cac Iinh kien la Iy tuong Tinh ty s6 dong (ti s6 di~u che) D dn thiet, (O.Sd) Ve gian d6 dong qua Lm vao hlnh 1b (rng v6"ity s6 d6ng D da Hnh 6" diu (O.Sd), va tinh cac gia tri dong iLml6"nnhftt va nho nhftt (ld) Can (2d): Cho b9 bi~n d6i di~n ap m9t chi~u d~ng dao dong nhu hlnh 2a Transistor TI va T2 dU'Q'cdi~u khi~n kfch d6i nghjch v6"i tAn s6 d6ng cilt khong d6i va thay d6i ty s6 d6ng (ti s6 di~u ch~) D B9 dao dong c6 cac thong s6 nhu sau: Ap ngu6n: Vd = 200V, Tai: R=IO, L = O.OIH, E = 100V, tAn s6 d6ng cilt kh6a: fsw = 1kHz Xet m~ch 6" ch~ d9 xac l~p v6"iti s6 d6ng D = 0.4 Ve gian d6 xung di~u khi~n d6ng ngilt transistor TI, T2 (mg v6"ity s6 d6ng da cho vao hlnh 2b (O.Sd) Ve gian d6 ap ng6 Vovao hlnh 2c va tinh tri trung blnh di~n ap (O.Sd) Tfnh tri trung blnh dong tai io va ve gian d6 dong di~n vao hlnh 2d, bi~t d9 dQ'n s6ng cua dong tai io la L1io~ SA (O.Sd) Ve gian d6 dong qua transistor Tl va T2 vao hlnh 2e (O.Sd) Can (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 b~ng cach so sanh s6ng mang Vtr; v6"is6ng di~u khi~n Vcontrol m~ch di~u khi~n, va cac s6ng c6 d?:ng nhu hlnh 3b Tai c6 tri s6: R=50, L=100mH Ngu6n DC cung 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 Vo (ghi r6 cac m(rc di~n ap tuong (rng) (O.Sd) Gia thi~t s6ng mang Vtr; c6 tAn s6 rftt l6"nhO'n s6ng di~u khi~n Vcontrol· N~u mu6n hai b~c cua di~n ap ng6 Vo c6 trj hi~u dl,lng Vol,rllls = va tAn s6 Ji = 50Hz, thl tAn s6 va bien d9 cua s6ng Vcontrol phai la bao nhieu, bi~t bien d9 cua s6ng mang la Vtri = 12V (O.Sd) Tfnh tri hi~u dl,lng cua hai b~c nov Clla dong tai io IllCnay (O.Sd) MSSV: HQ va ten SV: Trang //6 CaD (2d): Cho b,0 ( , 1113) +_ esr - 3gQ7W _ it (O,r-t) ... cHuAN DAu RA MON HQC TUONG UNG vor DE THI Mon thi: CS Di~n tif cong suit - EE2021 Ngay thi: 29/07/2020 - Thai hrong: 90 phut D~ thi s6: NQi dung diu hoi tren d~ thi NQi dung chuan d§u mfin hoc Cau... kieu s6ng vuong (six- step inverter) voi ehu ky T, = 20ms Ve cac xung kich dn thiet eho cac transistor TI-7T6 vao d6 thi tren hinh 4b (O.5d) Ve dang di~n ap pha tai VAn vao hlnh 4e (O.5d) Tinh... t§.ns6 jj = SOHz, thi t§.n s6 va bien d