Chng I:Gii Thiu Linh Kin

PHN C: TNG KT

PHN A : gII tHIU

PHN A: GII THIU

[Type text]Page 1

GVHD: H Vn ThiTrang 17

LI NI UVi s pht trin khng ngng ca khoa hc cng ngh, cuc sng ca con ngi ngy cng tr nn tin nghi v hin i hn.iu em li cho chng ta nhiu gii php tt hn, a dng hn trong vic x l nhng vn tng chng nh rt phc tp gp phi trong cuc sng. vic ng dng nhng thnh tu khoa hc k thut hin i trong tt c cc lnh vc v ang pht trin ph bin trn th gii, thay th dn nhng phng php th cng, lc hu v ngy cng c ci tin hin i v hon m hn.Trong cc b bin i in t cng sut khng th khng nhc n cc b bin i in p DC/DC, DC/AC. Cc b bin i ny ngy cng c ng dng trong cc lnh vc iu khin ng c, truyn ng in, tit kim nng lngy cng chnh l ti ca n mn hc ny.V trong hc k ny nhm chon ti Thit k h thng nghch lu 12VDC ln 220VAC tn s 50Hz lm ti cho n mn hc ny.Trong thi gian ngn thc hin ti cng vi kin thc cn nhiu hn ch, nn trong tp n ny khng trnh khi thiu st. Nhm thc hin ti mong nhn c kin ng gp ca Thy C v cc bn sinh vin n c th hon thin hn.Chng em xin chn thnh cm n!Nhm sinh vin thc hin ti:Nguyn Thi NhnNguyn Huyn TrngNguyn Kiu Dim MyNuyn Trung Ha

TP.H Ch Minhngythng 12nm 2014

MC LCPHN A : gII tHIU1LI NI U2MC LC3Danh Mc Hnh nh5PHN B : NI DUNG6CHNG I : GII THIU LINH KIN7I.IC 55571.Thng s72.Chc nng ca 5557II.IRF Z44N8III.BIN P CP NGUN8IV.TRANSISTOR 2SC9458V.IN TR8VI.T IN91.T in phn cc92.T in khng phn cc93.T in c tr s bin i10VII.C QUY10CHNG II: CC B NGHCH LU11I.NGHCH LU DNG111.Nghch lu dng 1 pha11a)Nguyn l lm vic11b)nh hng ca ph ti i vi ch lm vic ca nghch lu122.Nghch lu dng 3 pha13II.NGHCH LU P141.Nghch lu p 1 pha142.Nghch lu p 3 pha15III.NGHCH LU CNG HNG.171.Nghch lu cng hng song song172.Nghch lu cng hng ni tip.17IV.NGHCH LU IU BIN RNG XUNG PWM (Pulse Width Modulation).18CHNG III : THIT K VA THI CNG20I.S KHI H THNG NGHCH LU 12VDC TO 220VAC20II.LA CHN B NGHCH LU20III.S NGUYN L MCH NGCH LU 12VDCTo 220VAC 50Hz211.Mch dao ng212.Mch ng lc223.Tnh ton mch ng lc.22a.Tnh ton Van ng lc23b.Transistor 2SC549234.Tnh ton bin p24PHN C : TNG KT26TNG KT27I.CC VN C GII QUYT TRONG N27III.Ti liu tham kho:29

Danh Mc Hnh nhHnh 1 : IC NE5557Hnh 2 : Hnh nh V Cu To IRFZ44N8Hnh 3 : My Bin p8Hnh 4 : Transistor 2SC 4958Hnh 5 : K Hiu in Tr8Hnh 6 : T in9Hnh 7 : K Hiu Cc Loi T in9Hnh 8 : c Quy V Cu To c Quy10Hnh 9 : S Nghch Lu Cu 1 Pha11Hnh 10 : S Nghch Lu 1 Pha C im Trung Tnh11Hnh 11 : Gin Xung Ca Nghch Lu Cu 1 Pha12Hnh 12: S thay th ca nghch lu dng 1 pha12Hnh 13 : S Nghch Lu Dng 3 Pha13Hnh 14 : Gin Xung Nghch Lu Dng 3 Pha13Hnh 15 : S Nghch Lu p Cu 1 Pha14Hnh 16 : Th Nghch Lu p 1 Pha14Hnh 17 : S Nghch Lu p 3 Pha15Hnh 18 : Lut iu Khin Cc Tiristo15Hnh 19 : in p Trn Ti Mch Nghch Lu16Hnh 20 : a) Nghch Lu Cng hng Song Song _ b) Gin Xung17Hnh 21 : Mch Nghch Lu Cng Hng Ni Tip V S Thay Th17Hnh 22 : S Khi iu Khin Cc Van Ca PWM18Hnh 23 : in p Ra iu khin Bi Xung n Cc18Hnh 24 : in p Ra Trn B Nghch Lu iu Khin Bi Xung Lng Cc19Hnh 25 : S Khi H Thng Nghch Lu 12VDC To 220VAC20Hnh 26 : S Nguyn L Ton H Thng21Hnh 27 : Mch Dao ng22Hnh 28 : S Nguyn L Mch Nng in p22Hnh 29 : Hnh Dng V Cu To IRFZ44N23Hnh 30 : Hnh Dng V Cu To Transistor NPN 2SC54924Hnh 31 : Cu To Bin p25Hnh 32 : Dng Sng Ng Ra Ca B To Dao ng F = 50Hz28Hnh 33: Dng Sng Ng Ra Ti 220VAC28Hnh 34 : Mch Thc T28

PHN B : NI DUNGPHN B: NI DUNG

CHNG I : GII THIU LINH KINI. IC 5551. Thng sin p u vo : 2 - 18V ( Ty tng loi ca 555 : LM555, NE555, NE7555..)Dng tiu th : 6mA - 15mAin p logic mc cao : 0.5 - 15Vin p logic mc thp : 0.03 - 0.06VCng sut tiu th (max) 600mW2. Chc nng ca 555To xungiu ch c rng xung (PWM)Hnh 1 : IC NE555iu ch v tr xung (PPM) (Hay dng trong thu pht hng ngoi) Chn s 1(GND): cho ni GND ly dng cp cho IC hay chn cn gi l chn chung. Chn s 2(TRIGGER): c dng nh 1 chn cht hay ng vo ca 1 tn so p. Chn s 3(OUTPUT): Chn ny l chn dng ly tn hiu ra logic. Trng thi ca tn hiu ra c xc nh theo mc 0 v 1. 1 y l mc cao n tng ng vi gn bng Vcc nu (PWM=100%) v mc 0 tng ng vi 0V nhng m trong thc t mc 0 ny ko c 0V m n trong khong t (0.35 ->0.75V) . Chn s 4(RESET): Dng lp nh mc trng thi ra. Khi chn s 4 ni masse th ng ra mc thp. Cn khi chn 4 ni vo mc p cao th trng thi ng ra ty theo mc p trn chn 2 v 6. Chn s 5(CONTROL VOLTAGE): Dng lm thay i mc p chun trong IC 555 theo cc mc bin p ngoi hay dng cc in tr ngoi cho ni GND. Chn s 6(THRESHOLD) : l mt trong nhng chn u vo so snh in p khc v cng c dng nh 1 chn cht. Chn s 7(DISCHAGER) : c th xem chn ny nh 1 kha in t v chu iu khin bi tng logic ca chn 3 .Khi chn 3 mc p thp th kha ny ng li.ngc li th n m ra. Chn 7 t np x in cho 1 mch R-C lc IC 555 dng nh 1 tng dao ng . Chn s 8 (Vcc): N c cp in p t 2V -->18V (Ty tng loi 555.thp nht l con NE7555)

II. IRF Z44N

Hnh 2 : Hnh nh V Cu To IRFZ44NIII. BIN P CP NGUNNgun vo : 12Vdc ly t Acquy / 5AhNgun ra : 220VacCng sut : 110W

Hnh 3 : My Bin p

IV. TRANSISTOR 2SC495Transistor C495 l transistor thuc loi transistor NPN.C495 c Uc cc i = 50V dng Icmax = 100mAH s khuch i ca 2SC495 hFE trong khong 90 n 600.Th t cc chn t tri qua phi: E C B

Hnh 4 : Transistor 2SC 495V. IN TRin tr l mtlinh kin in t th ngtrongmch inin tr khngli lng vt lc trng cho tnh cht cn trdng inca in tr. Hnh 5 : K Hiu in Trin tr khng c nh ngha l t s cahiu in thgia hai u vt th vicng dng ini qua nR= ()Trong :U: l hiu in th gia hai u vt dn in, o bngvn(V).I: l cng dng in i qua vt dn in, o bngampe(A).R: l in tr ca vt dn in, o bngOhm().

VI. T INMt s hnh nh thc t v k hiu ca t inT in:Hnh 6 : T inL mtlinh kin in t th ngto bi hai b mtdn inc ngn cch biin mi. Khi c chnh lchin thti hai b mt, ti cc b mt s xut hinin tchcng cng , nhng tri du.S tch t ca in tch trn hai b mt to ra kh nng tch trnng lngin trngca t in. Khi chnh lch in th trn hai b mt lin th xoay chiu, s tch lu in tch bchm phaso vi in p, to nntr khngca t in trong mch in xoay chiu.Cc loi t in:Hnh 7 : K Hiu Cc Loi T in1. T in phn cc T inphn cc(c cc xc nh) hoc theo cu to cn gi lt ha. Thng trn t quy c cc m phn bit bng mt vch mu sng dc theo thn t, khi t mi cha ct chn th chn di hn s l cc dng. Khi u ni phi ng cc m - dng. Tr s ca t phn cc vo khong 0,47F - 4.700F, thng dng trong cc mch tn s lm vic thp, dng lc ngun.2. T in khng phn ccT in khng phn cc (khng xc nh cc dng m); theo cu to c th l tgiy, tgm, hoc tmica. T xoay chiu thng c tr s in dung nh hn 0,47F v thng c s dng trong cc mch in tn s cao hoc mch lc nhiu.3. T in c tr s bin iT in c tr s bin i, hay cn git xoay(cch gi theo cu to), l t c th thay i gi tr in dung, t ny thng c s dng trong k thutRadio thay i tn scng hngkhi ta d i (knhtn s).VII. C QUYNgun in th cphayc quy(gc ting Phpaccumulateur) haypin sc,pin th cpl loipinc th ti s dng nhiu ln bng cch cminv t vo b sc sc liHnh 8 : c Quy V Cu To c Quyc quy ch - a xtGm c cc bn cc bng ch v xt ch ngm trong dung dchaxt sulfuaric. Cc bn cc thng c cu trc phng, dp, dng khung li, lm bng hp kim ch antimon, c nhi cc ht ha cht tch cc. Cc ha cht ny khi c np y lixt chcc dng, v ch nguyn cht cc m.Cc bn cc c ni vi nhau bng nhng thanh ch pha trn, bn cc dng ni vi bn cc dng, bn cc m ni vi bn cc m. Chiu di, chiu ngang, chiu dy v s lng cc bn cc s xc nh dung lng ca bnh c - Quy. Thng thng, cc bn cc m c t bn ngoi, do s lng cc bn cc m nhiu hn bn cc dng. Cc bn cc m ngoi cng thng mng hn, v chng s dng din tch tip xc t hn.Cht lng dng trong bnh c quy ny l dung dch xt sunfuaric. Nng ca dung dch biu trng bngt trngo c, tu thuc vo loi bnh c quy, v tnh trng phng np ca bnh.

CHNG I: GII THIU LINH KIN

CHNG II: CC B NGHCH LUNghch lu c lp l thit b bin i dng in mt chiu thnh dng in xoay chiu c tn s ra c th thay i c v lm vic vi ph ti c lp.Ngun in mt chiu thong thng l cc in p chnh lu, c quy v cc ngun in mt chiu c lp khc.Ngi ta thng phn loi nghch lu theo s nh nghch lu 1 pha hay 3 pha hoc cng c th phn theo qu trnh in t xy ra trong nghch lu nh: nghch lu p, nghc lu dng, nghch lu cng hngI. NGHCH LU DNG1. Nghch lu dng 1 phaL thit b dung bin i ngun dng 1 chiu thnh dng xoay chiu c tn s ty c im c bn ca loi ny l ngun mt chiu cp in cho b bin i phi l ngun dng, do in cm u vo Ld thng c gi tr ln dng in l lien tc.a) Nguyn l lm vicS nghch lu 1 pha c trnh by trn hnh 1.1 s cu v hnh 1.2 s c im trung tnh.Xt s cu: Cc tn hiu iu khin c a vo tng i T1, T2 th lch pha vi tn hiu iu khin a vo i T3 v T4 mt gc 1800

Hnh 9 : S Nghch Lu Cu 1 Pha

Hnh 10 : S Nghch Lu 1 Pha C im Trung Tnhin p u vo nghch lu ln Ld= do dng in vo c san phng, ngun cp l ngun dng v c dng xung vungDng phng ngc chiu vi dng qua T1 v T2 s l cho T1 v T2b kha li.

Hnh 11 : Gin Xung Ca Nghch Lu Cu 1 Phab) nh hng ca ph ti i vi ch lm vic ca nghch luXt trng hp Ld= (in cm v cng ln). S trn hnh 1.2 c th thay th bng s hnh 1.4

Hnh 12: S thay th ca nghch lu dng 1 phaNghch lu dng khng c kh nng lm vic ch khng ti, v nu Rt -> th Ut -> v id-> .Trn thc t Rt ln v cng th in p trn ti cng tin n gi tr rt ln,do qu trnh chuyn mch khng th thc hin c, cng nh khng co thit b bn dn no chu ng ni qu in p ln nh vyNgc li khi tang ph ti ngha l tng ng vi vic gim Rt, lc ny dng np cho t s gim. ngc li dng phng qua ti s tang. iu dn n gim nng lng tch tr trong t, in p trn ti gn vi hnh ch nht, gc cng gim ng k v nh hng ti qu trnh chuyn mch ca nghch lu.2. Nghch lu dng 3 phaTong thc t nghch lu dng 3 pha c s dng ph bin v cng sut ca n ln v p ng c cc ng dng trong cng nghip

Cng ging nh nghch lu dng 1 pha th nghch lu dng 3 pha cng s dng tiristor kha cc tiristo th phi cso cc t chuyn mch C1, C3, C5V l nghch lu dng nn ngun u vo phi l ngun n, v vy gi tr Ld=.

Hnh 13 : S Nghch Lu Dng 3 Pha

Hnh 14 : Gin Xung Nghch Lu Dng 3 Pha

m bo kho c cc tiristo chc chn v to ra dng 3 pha i xng. Qua th trn mi van ng lucj ch dn trong khong thi gian = 1200.

II. NGHCH LU PNghch lu p l thit b bin i ngun p mt chiu thnh ngun p xoay chiu vi tn s ty .Ngun p vn c s dng ph bin hn trong thc t, Hn na in p ra ca nghch lu p c th iu ch theo phng php khc nhau c th gim c song iu h bc caoTrc kai nghch lu p b hn ch trong ng dng v cng sut ca cc van ng lucj iu khin nh, Hn na s iu khin phc tpNgy nay cng sut cc van ng lc IGBT,GTO,MOSFET cng tr nn ln v c kch trc gn nh, do nghch lu p tr thnh b bin i thong dng v c chun ha trong cc b bin i trong cng nghipTrong qu trnh nghin cu ta gi thit cc van ng lc l cc kha in l tng, tc l thi gian dongd v mi bang khng nn in tr ngun bng khng1. Nghch lu p 1 pha Cu toS nghch lu p 1 pha c m t trn hnh 1.9. s gm 4 van ng lucj l T1, T2,T3, T4 v cc diode D1, D2, D3, D4 dng tr cng sut phn khng v trnh hin tng qu p u ngun.T C mc song song vi ngun v tip nhn cng xut phn khangd ca ti ng thi t C cn m bo cho ngun u vo l ngun p

Hnh 15 : S Nghch Lu p Cu 1 Pha

Hnh 16 : Th Nghch Lu p 1 PhaTrn thc t ngi ta dung nghch lu p vi phng php iu ch rng xung PWM gim bt kch thc ca b lc. 2. Nghch lu p 3 phaS nghch lu p 3 pha hnh 1.11 c ghp t ba s 1 pha c im trung tnhGi s cc van l tng, T1,T2,T3,T4,T5,T6 lm vic vi dn in =1800, Za=Zb=Zc

Cc diode D1,D2,D3,D4,D5,D6 lm chc nng tr nng lng v ngun v t C m bo ngun cp l ngun p ng thi tip nhn nng lng phn khng t ti.

Hnh 17 : S Nghch Lu p 3 Pha

Hnh 18 : Lut iu Khin Cc Tiristo

m bo to ra in p 3 pha i xng lut dn in cc van phi tun theo nh th (hnh 1.12)Nh vy T1,T4 dn in lch nhau 1800 to ra 3 pha B. T5,T2 dn lch nhau 1800 to rap ha C, v cc pha lch nhau 1200.

Hnh 19 : in p Trn Ti Mch Nghch Lu

III. NGHCH LU CNG HNG.c dim c bn ca nghch lu cng hng l qu trnh chuyn mch ca van da vo hin tng cng hng. Gi tr in cp khng ln nh nghch lu dng (Ld=), m chim mt v trid trung gian sao cho khi kt hp vi in cm ti Lt v t in C th trong amchj s xut hin hin tgj dao ng in.

1. Nghch lu cng hng song songXt s hnh 1.14, khi t=0 cp van T1,T2 c m ra, T C c np , dng np cho t c dng hnh sin v mch dao ng cng hng.

Hnh 20 : a) Nghch Lu Cng hng Song Song _ b) Gin Xung

2. Nghch lu cng hng ni tip.S gm 2 cun cm L1 v L2 c qun trn cng mt li thp to ra hin tng cm ng, t C c mc ni tip vi tiCc gi tr ca L1, L2, C v Rt c chn sao cho dng qua Tiristo l dng dao ng.Nghch lu ni tip c ba ch lm vic:Ch kha t nhin: f0> f; dng qua T1 gim v khng sau mt khaongr thi gian m T2, ch ny tng t ch lm vic ca nghch lu song song.Ch gii hn: f0 = f; dng qua T1 gim v khng th T2 c m v vy ch ny m bo dng ti It v in p ti Ut l hnh Sin.Ch chuyn mch cng bc: f0 < f khi T1 cn cha kho kch m xung cho T2

Hnh 21 : Mch Nghch Lu Cng Hng Ni Tip V S Thay Th

IV. NGHCH LU IU BIN RNG XUNG PWM(Pulse Width Modulation).Cc b nghch lu trnh by trn c in p ra cha nhiu sng hi, nng cao cht lng in p u ra ca b nghch lu, b nghch lu iu bin rng xung PWM c a ra nghin cu v ng dng.Tiu chun nh gi cht lng b nghch lu l mc gn Sin chun ca in p u ra.Trong tt c cc b nghch lu thid b nghch lu iu bin rng xung c nh gi l b nghch lu cho php a ra dng song gn Sin nht.Trn hnh 1.17 biu din s khi iu khin cc tiristo ca PWM. T cho ta thy : hai tn hiu iu khin Uk v tn hiu song mang Ux a vo b so snh. Khi hai in p ny bang nhau s cho mt xung, qua b chia xung ta a ti iu khin cc tiristo tng ng.

Hnh 22 : S Khi iu Khin Cc Van Ca PWM

Hnh 23 : in p Ra iu khin Bi Xung n Cc

Trn hnh 23 biu din phng php to in p ra bng so snh in p iu khin hnh Sin v in p tam gic cn, cn hnh 1.18 l cch to ra in p bng cc xung n cc.Trong khi hnh 24 l phng php to ra in p ra bng cc xung lng cc

Hnh 24 : in p Ra Trn B Nghch Lu iu Khin Bi Xung Lng CcMch nghch lu 3 pha PWM gm ba mch nghch lu 1 pha ghp li vi nhau.Trong s nghch lu 3 pha ta c th s dng mt b pht dao ng song mang. Cn in p iu khin so snh th phi c 3 b pht dao ng hnh Sin c cng bin nhng lch pha nhau 1200 theo th t pha.

CHNG II: CC B NGHCH LU

CHNG III : THIT K VA THI CNGI. Cng SutDao ngS KHI H THNG NGHCH LU 12VDC TO 220VAC

NGUNBin p

Hnh 25 : S Khi H Thng Nghch Lu 12VDC To 220VACTa a ra thng s v yu cu b nghch lu cn thit k nh sau:Ngun cp l Acquy 12VDC/5Ah.Cng sut 110W.in p u ra 220VAC/50Hz.II. LA CHN B NGHCH LUVi ngun cp l Acquy nn ta s dng mch nghch lu c lp.Nh vy ta c ba s chn la : Nghch lu c lp ngun p, ngun dng v cng hng.Mch nghch lu c lp dng in c cp t ngun dng, y ta s dng ngun cp l acquy nn khng ph hp.Mch nghch lu c lp cng hng c dng in p ra gn sin nht, tuy nhin vi tn s ln t 500Hz tr ln do vy khng ph hp s dng cho mch m ta cn thit k.Nh vy ta s dng mch nghchlu c lp ngun p, c hai la chn:Nghch lu c lp ngun p mt pha.Nghch lu c lp ngun p ba pha sau ly mt pha s dng. Nghch lu c lp ngun p ba pha c dng hnh sin hn so vi nghch lu c lp ngun p mt pha, tuy nhin vi mc ch s dng nh ban u ta a ra th hon ton khng cn thit phi dng nh vy, bi b nghch lu p ba pha cho chi ph cao hn v tnh ton iu khin cng phc tp hn rt nhiu, trong khi ta ch cn s dng mt pha cho nhu cu sinh hot hng ngy.Do vy ta s chn mch nghch lu c lp ngun p mt pha vi cc thng s v yu cu ra.B bin i DC/AC s gm hai thnh phn chnh nh sau :Mach iu khin : C nhim v pht xung vung dao ng vi tn s 50 Hz cp xung m cho transitor, transitor dn s lm cho mosfet dn.Mch lc b nghch lu mt pha :c nhim v y ko in p 12V DC ln 220VAC tn s 50Hz.III. S NGUYN L MCH NGCH LU 12VDCTo 220VAC 50Hz

Hnh 26 : S Nguyn L Ton H Thng

1. Mch dao ngMach tao xung bng ic 555Xung vung vi tn s 50Hz t c to ra t IC NE555 c a vo chn B ca transistor c945 va cc G cua mosfet irfz44nNguyn l hot ng ca mch to xung dao ng tn s 50Hz.IC NE555 c cp ngun 12VDC t bnh Acquy trc tip vo chn 8 va chn 4 cua IC. to ra tn s 50Hz ti chn 3 ca IC 555 ta mc t in c in dung l 0.1uF, chn s 2 va chn 6 ca IC c mc tr c in tr l 120k v chn s 7 c ni vi in tr 4k7. Xung vung ra vi tn s 50Hz ti chn s 3 ca IC. Xung ny s c a vo chn B ca transistor C945 v cc G cua mosfetHnh 27 : Mch Dao ngCach tinh tn s cua mach tao xung :Tn s ca tn hiu u ra l :f = 1/(ln2.C.(R1 + 2R2))Chu k ca tn hiu u ra : t = 1/fThi gian xung mc H (1) trong mt chu k :TH = ln2 .(R1 + R2).CThi gian xung mc L (0) trong 1 chu k :TL = ln2.R2.C2. Mch ng lc

Hnh 28 : S Nguyn L Mch Nng in pin p acquy 12VDC c a ti im trung tnh ca cun s cp bin p , hai Mosfet v ni chung cng ngun S ni ti cc m ca acquy, cc cng mng D ca Q4 v Q5 ni vi cc u cn li ca s cp my bin p ri c ni vi cc dng ca acquy3. Tnh ton mch ng lc.Mch ng lc ca b bin i in p mt chiu thnh in p xoay chiu cho ti. in p xoay chiu tn s f = 50 Hz trn cun th cp bin p .T thng s mch nghch lu nh sau:P = Sm = 110 W VAC = 220V Tn s ca in p l : f = 50Hz. Dng in trn ti : Id = 110/220 = 0,5 Aa. Tnh ton Van ng lcNh vy vi yu cu thc t v cc thng s mch ta chn van ng lc loi transitor trng cng sut knh N (Mosfet ): IRFZ44N vi cc u im nh sau:Tc ng ct nhanh.in tr ni rt nh : RDS(on) = 0,6 ().Dng in cc i : IDS = 49 (A).in p cc i : VDS = 55VCc xung vung c to ra bi IC NE555 a n chn G Xung c in p > 0v Fet dnXung c in p =0v Fet ngt T ng ngt lin tc to dng in bin thin lin tc chy qua cun s cp bin p sinh ra t trng bin thin cm ng ln cc cun th cp my bin p v cho ra in pHnh 29 : Hnh Dng V Cu To IRFZ44N

b. Transistor 2SC549

Hnh 30 : Hnh Dng V Cu To Transistor NPN 2SC549Transistor l loi Transistor cng sut, c dng Ic max = 100mAVc max =50vHfe (90:100).RC = 1k ,UC = 12V IC = = 12.10-3 A = 12 mATrong khi ; IC 555 to ra xung vung vi cc mc in p khc nha:Xung mc cao c in p gn bng VccXung mc thp c in p 0.35v 0.75 vUb = 0.7v, Ib = 0.12 mA Rb = 5.6k

4. Tnh ton bin p Bin p thc t s dng trong mch:Bin p c kch thc : a = 3(cm), b = 4,2 (cm)Bin p c in th ngun l 12 Volt.in th ra l 220 Volt dng th cp l 0.5A.Ta s dng st t c li in tch l 12,6 cm2 ,tn s 50 Hz.Hnh 31 : Cu To Bin p

Din tch ca tr qun dy phi ph hp vi cng sut MBA.Sm (nh mc) l cng sut MBASm = U1 * I1 = 220*0.5 = 110 VA (W)Tnh tit din tr qun dy ca li thp:Shi =1,2= 1,2 *= 12,6 cm2Trong : Shi= a * b (cm2) =3 * 4S vng/ 1 Volt (n) l i lng tnh s vng s cp N1 v th cp N2S vng n tnh theo cng thc:n= = = 3,3 =3 vng/volttrong : 42 l h s cho st tt50 l h s cho st xuU1 = 12v dc 5AU2 = 220v ac / 0.5AT tnh c s vng cun s cp: N1 = n.U1 = 3*12 =36 vngM cung s cp my bin p im gia nn c 2 cun mi cun 36 vng dyN2 = n.U2 = 3 * 220 = 660 vngTit din dy dn:Sd = = = 1,7 mm2 (vi I= 5A, J = 3 l mt dng in khi cng sut MBA>100W)ng knh dy:Dd = = = 1,2 mm

CHNG III: THIT K V THI CNG

PHN C : TNG KTSau hn 4 tun tm hiu v thc hin vi nhiu n lc v c gng ca nhm thc hin ti cng vi s hng dn ca Thy H Vn Thi quyn n ny hon thnh vi nhng ni dung sau:I. CC VN C GII QUYT TRONG NCc vn nghin cu:Nghin cu Mch nghch lu v cc dng nghch luNghin cu cch iu ch xung dao ng vi tn s 50HzThit k v thi cng m hnh Nghch Lu 12VDC ln 220VACKt qu thc nghim v nh gi m hnh:Thi gian nghin cu v thi cng khng nhiu nn phn thit k vn cha ti u v tnh thm m v hiu qu kinh t nhng vn m bo m hnh hot ng tt.M hnh c th chp nhn c v ni dung cn thit.u v nhc im ca thi cng mchu im: Mch nh gn , chy n nh v chi ph thpNhc im:Mch ch cho cng sut thp khong 110W dung cho nhu cu thp sangKhng dung cho Ti cm c v m hnh cho ra dng song VungCc phng hg pht trin ti:Tng kch thc ca mch cho ph hp vi thc tTm hiu v thi cng mch vi cng sut cng nh p ng yu cu th t hn ti Nghch Lu 12 ln 220 trnh by c nguyn tc hot ng c bn cng nh tnh ton gi tr cc linh kin ph hp vi mch v c bit l khi cng sut nhm m bo hot ng mch hot ng tng i n nh.Tuy nhin,do cn hn ch v thi gian v trnh nn ti khng trnahs khi nhiu sai st, nhm rt mong c s dng gp kin chn tnh ca Thy v cc bn n c hon thin hn.II. Mch v dng sng thc t thu c

Hnh 32 : Dng Sng Ng Ra Ca B To Dao ng F = 50Hz

Hnh 33: Dng Sng Ng Ra Ti 220VAC

Hnh 34 : Mch Thc T

III. Ti liu tham kho:

http://www.linhkiendientu.co/2012/05/bien-oi-12v-dc-len-220v-ac-50w.html http://4tech.com.vn/forums/showthread.php/ http://www.phuclanshop.com/TraoDoiHocTap-ChiTiet.aspx?NewsId=118/ http://www.linhkiendientu.co/2012/05/bien-oi-12v-dc-len-220v-ac-50w.html http://www.dientuvietnam.net/forums/dien-tu-cong-suat-62/gui-tang-ae-mach-nghich-luu-500w-dung-tran-rat-de-lap-50629/ http://www.dientuvietnam.net/forums/ http://www.datasheet4u.com/ Gio trnh in T Cng Sut _Thy Thng Vn B_ Trng CDKT Cao Thng Gio trnh K thut in t tng t - B mn k thut in t - Trng i hc K thut cng nghip - HTN