chương 3 thiết kế bộ biến đổi dc
TRANSCRIPT
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Chng 3
Thit k n chiu sng dng LED cng sut
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3.1 t vn
Ph thuc vo yu cu chiu sng trong sinh hot ta c th
chn cng sut ca n chiu sng ph hp.
Mi phn t LED c nh sn xut linh kin bn dn bn ra th trng c cng
sut nht nh. V d loi LED trn, loi ma trn 1w, 2w, 3w, 5w, 10w. tnh
ton thit k ra c mt loi n dng trong chiu sng sinh hot ta phi tch hp
trn c s la chn cc phn t LED c sn. V d cn c mt n chiu sng cng
ngh LED cng sut 300w ta phi tch hp t 30 n LED 10w, mc theo s 3
hng song song, mi hng 10 LED. V ngun in dng cho n c xc nh
trn c s in p yu cu v dng in yu cu. V d LED 10w c cc thng s
theo nh thit k cung cp. Dng in cc i I=1.1Amp, in p 3.2 volt. Vi 10
LED ni tip th in p s l 32Volt, v 3 nhnh song song, th ngun cung cp s
c dng in cung cp l 3.3 Amp. V thit k thm m cho sn phm ta c th c
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cc hnh dng, mu sc khc nhau. Tnh ton tn nhit, tnh ton h thng quang
hc, loa hng
3.2 C s tnh ton cung cp ngun cho n LED
+ Mu sc ph thuc vo mc in p cung cp cho LED (theo bng trong phn
LED trn)
Loi LEDin th phn cc
thun 1,4 1,8V
Vng 2,0 2,5VXanh l
cy 2,0 2,8V
+ Cng sng ph thuc vo dng in i qua mt ghp.
V d mch in i vi n LED c dng
Hnh 3.1 S ghp ni cc phn t LED
in tr s c tnh theo cng thc :
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f
fs
I
VVR
=
Trong :
Vs : in p ngun cung cp
Vf: in p ri trn LED; V d mu trng in p ri l 3.2 v, vi 3 LED
ni tip Vy tng in p ri l 3.2*3=9.6 volt
If : Dng in cho php ca LED, loi thng thng 20mA
Thng thng i vi cc thit k n gin ta tin hnh la chn loi nLED, sau la chn b bin i ngun, sau tnh ton s LED ni tip s LED
song song, tnh in tr hn ch. Nh vy ta c mt loi n LED t yu cu.
Tuy nhin vi mc ch nng cao hiu sut chiu sng, gim tn tht in nng
(cc tng tht nhit) th vic dng in tr hn ch khng gim c tn tht. Vi
cc loi n LED cng sut ln th dng in cho php ln n hng Amper th
vic dng in tr hn ch s khng c hiu qu v tin cy lm vic di hn skm. V vy ta phi tnh ton thit k b bin i iu chnh c dng in mt
chiu.
3.3 Thit k b bin i DC/DC c th iu chnh c in p v dng in
dng trong n LED
Ta c 2 la chn
- Cng ngh da trn k thut tuyn tnh- Cng ngh bin i rng xung
Khi xt n hiu sut, tc l cng sut tn hao th cng ngh bin i rng xung
c u im vt tri so vi cng ngh k thut tng t.
3.3.1 Phng php n nh tuyn tnh.
Hot ng c bn ca B iu chnh tuyn tnh
Cc ngun cung cp in nng u lm vic theo mt nguyn tc c bn
ging nhau cho d l ngun tuyn tnh hoc cc loi ngun phc tp. Tt c cc
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ngun cung cp in nng u c cc b phn so snh, x l cc tn hiu phn hi.
iu ny nhm mc ch da trn thng tin gi in p u ra ti mt gi tr.
Hnh 3.2 S khi nguyn l n nh in p tuyn tnh
B iu chnh tuyn tnh ch l h thp s iu chnh, c ngha l cc ngun
in p u vo phi c gi tr cao hn nhiu so mc in p ra mong mun. C
hai phng php iu chnh tuyn tnh: B n p song song v B n p ni tip.
B n p song song chnh l cc b iu chnh in p c mc song song vi ti.
Mt ngun dng in cha iu chnh c kt ni vi mt ngun in p cao
hn, B n p song song to ra mt dng in c duy tr mt gi tr c nhcung cp trn ti cho mt bin in p u vo v dng trn ti. Mt v d ph bin
ny l b iu chnh Zener Diode . B n p ni tip hiu qu hn so vi B n p
song song v s dng hiu qu cc mt bn dn nh l hng lot ci mc ni tip,
gia ngun u vo v ti.
Hnh 3.3 S c bn b iu chnh tuyn tnh
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B n p ni tip hot ng trong ch tuyn tnh, iu c ngha l cc
n v khng c thit k tc ng trn ton b cng sut hoc tt ch ,
nhng thay vo n s tc ng trong mt mc ca "ch m ring." Nhng
dng phn hi m s xc nh mc dn in qua cc thit b iu chnh gi
tr in p.
Trung tm ca vng phn hi in p m l b khuych i thut ton h
s cao c gi l b khuych i sai s. Mc ch ca n l tip tc so snh s
khc nhau gia mt mc in p chun v in p u ra. Nu u ra khc nhau
ch vi millivolts, sau iu chnh cho cc thit b vt qua ca dn l thc
hin. Gi tr in p chun c t trn u vo khng i v thng l thp hn
mc in p u ra. in p u ra c chia xung cp ca cc in p chun. B
chia in p u ra ny c t vo trong b nghch o u ra ca b khuych
i thut ton. l s nh gi in p u ra, im nt trung tm ca b chia
in p u ra l ng nht vi in p chun.
Vic khuch i sai s to ra mt in p m t c khuch i rt nhiu
to s khc nhau gia in p tiu chun v in p u ra ( sai s in p). Sai s
in p trc tip iu khin dn ca cc thit b duy tr s nh gi in p u
ra. Nu ti tng, in p s gim. iu ny sau s tng khuych i ca in
p u ra, iu s tng cng dng in cung cp cho ti. Tng t nh vy,
nu gim ti, in p u ra s tng, do lm cho b khuych i sai s p ng
bng cch gim dng qua cc thit b n ti.
T s truyn ca b khuych i sai s p ng cc s thay i ca in p
ra v lm th no duy tr ng in p ra ph thuc vo b khuych i sai sca vng phn hi m. Nhng thng tin phn hi m c iu khin bi s sp
xp cc phn t trong di in p chia v s sai lch ca in p u ra u vo
ca b khuych i sai s. Vic thit k khuych i bao nhiu cho dng in
mt chiu c biu hin, ci m cho ta bit chnh xc c in p u ra. N
cng ch ra c khuych i bao nhiu cho tn s cao v bng thng ca b
khuych i biu hin, ci m ch ra thi gian p ng cho s thay i ti u rahoc thi gian p ng qu .
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Cc hot ng ca mt b iu chnh tuyn tnh rt n gin. Rt ging nh
cc b iu chnh trung tm ca cc mch hin c, bao gm c b iu chnh
chuyn i phc tp. Nhng thng tin ca vng phn hi in p s s dng gii
hn cui cng ca cc ngun cung cp in - duy tr s n nh ca in p u ra.
Hnh 3.4 Mch n nh in p tuyn tnh 60Volt 1Amp
Tng quan v B iu chnh tuyn tnh
B iu chnh tuyn tnh lm vic ch lin tc. Phn ln cc b iuchnh tuyn tnh c ng dng hin nay phn theo cp chnh xc, vi mc nng
lng thp cc ng dng d dng p ng thng qua vic s dng cc mch iu
chnh tch hp. i khi mc d vy cc ng dng vn yu cu cao hn dng u ra
hoc ln hn chc nng ca gii hn ngun c th cung cp
Hnh 3.5 Cc thng qua n v ca nh hng n in p ri: (a) NPN qua n v;
(b) PNP qua n v.
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C cc thit k c cn nhc n thng nht cho c hai phng php tip cn
v ngi ta ch c p dng cho cc ngun khng c tch hp, ty chnh thit
k. Nhng ch xc nh ranh gii iu khin cc iu kin m cui cng s p
ng thit k, v mt s c lin quan phi c tnh xc ng cho mi thit k. Tht
khng may, rt nhiu k s b qua chng v gp s c trn ton b phm vi hot
ng ca cc sn phm sau khi sn xut.
u tin l xem xt ngng in p. Ngng in p l s gim in p tht
gia cc in p u vo v u ra in p trong thi gian hot ng. iu ny nh
hng ln vo qu trnh thit k sau ny, nhng cn c xem xt u tin, ch cn
xem ngun tuyn tnh c thch hp cho cc nhu cu ca h thng. Trc tin, hn
95% ca tt c cc ngun suy gim bn trong b iu chnh tuyn tnh l mt in
p ri. Ngng in p mt ny c xc inh bi :
PHR = ( Vin ( max ) -Vout)Iti
Nu h thng khng th x l nhit bng gi tr cc i ca nhit mi
trng xung quanh, sau thit k mt phng php tip cn nn c thc hin.
suy gim ny quyt nh ln ca b tn nhit cc b iu chnh tuyn tnh
phi c trn cc thit b.
Mt nh gi nhanh chng v phn tch nhit s cho cc nh thit k cho d
cc B iu chnh tuyn tnh s c gii hn nhit p ng cc yu cu ca
cc sn phm hot ng trong nhit mi trng cao nht c xc nh.
Th hai, ch yu l xem xt n gi tr ti thiu in p ri ca cu trc lin
kt ring trong b iu chnh tuyn tnh. y l in p ti thiu ca in p gii
hn c th c kinh nghim t cc b iu chnh tuyn tnh, sau c th iuchnh n. Cn c vo iu ta lm th no dng transistors iu chnh dng
in phn cc v in p. Thng thng cc dng ca b iu chnh tuyn tnh
s dng mt tranzito cng sut lng cc NPN. to ra nhng in p cn thit
gia bazo - emitter cho hot ng ca transistor, in p ny phi c bt ngun
t in p ring ca colecter-emitter. i vi cc phn t qua NPN , l in p
ti thiu ca ngng in p. iu ny dn n ngng in p khng th thphn in p ca baz-emitter (khong 0,65 VDC) ca cc phn t qua NPN cng
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vi st th trn bt k cc thit b iu khin baz (transistors v in tr). i
vi ba u cc ca b iu chnh nh nhm MC78XX , in p ny l khong t
1,8 n 2,5 VDC. ty chnh s dng mu thit k transistors NPN cho kt qu
u ra dng, in p u ra c th cao hn. i vi cc ng dng in p u vo
thm ch n gn hn 1,8-2,5 VDC ca in p u ra, b iu chnh in p ri
c ngh. Cu trc lin kt ny s dng mt transistor PNP thng, ci m ly
t in p baz-emitter t in p u ra thay th ca ngng in p hoc in
p u vo . iu ny cho php cc b iu chnh c th c in p st ti thiu l
0,6 VDC. MOSFETs P-Knh cng c th c s dng trong chc nng ny v c
th to in p st gn bng 0V.
S st gim in p tr thnh mt vn iu chnh khi u vo b iu
chnh tuyn tnh trong thi gian hot ng bnh thng cho php gim dn gn vi
in p u ra. Nu hot ng t mt trng bin p AC, iu ny s xy ra s yu
ngun in iu kin (AC ti thiu). St p iu chnh thp (e.g., LM29XX) s cho
php b iu chnh hot ng khi in p u vo AC thp hn . St p iu chnh
thp cng ang c s dng rng ri nh l b iu chnh chnh trn u ra ca
b bin i in nng ngun cung cp. Trong b iu chnh chuyn mch, hiu
sut c lin quan rt ln, v vy ngng in p st cn phi c gi mc ti
thiu. y, St p iu chnh thp s tit kim mt vi W quy c trn mt NPN
da trn b iu chnh tuyn tnh. Nu cc ng dng s khng bao gi thy
ngng in p thp hn 2.5V, ta thng s dng theo b iu chnh tuyn tnh
(e.g., MC78XX).
Mt s cn nhc khc l phn loi cc phn t thng s c s dng. Tmt headroom standpoint mt, lm cho n hon ton khng c s khc bit cho d
mt tranzito cng sut lng cc hoc mt MOSFET cng sut c s dng. S
khc bit n t cc mch iu khin. Nu ngng in p cao, b iu khin
(thng l mch ni t nh hng ) phi ko dng in t u vo hoc u ra
xung t. c cho mt transistor lng cc thng dng ny c tnh l :
IB = Iti /hFEPhn nng lng mt i lm transistor lng cc thng l :
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Pdrive =Vin(max) . IB or Vout . IB
Phn iu khin mt i ny c th tr thnh ng k. Mt transistor c
iu khin c th tr thnh transistor thng tng khuych i c ch ca cc
phn t thng v theo l gim dng iu khin , hoc mt MOSFET trng c
th c s dng nh l mt phn t thng s dng
trong mt quy m dng iu khin DC nh hn so vi transistor cng sut lng
cc. Tht khng may, cc MOSFET i hi in p ln n 10 VDC iu khin
cng. iu ny c th tng mnh in p st gim. Trong phn ln cc b iu
chnh tuyn tnh c ng dng, c 1 s khc nhau nh gia hot ng ca cu ni
v transistor Mosfet hiu qu phm vi ng dng lin quan. Transistors lng cc
r hn MOSFETs cng sut v t b dao ng hn.
Hnh 3.6 Phn b nhit trn PTHC
i vi cc ng dng vt qu gii hn ca cc b iu chnh tuyn tnh
tch hp mt mnh, thng l b sung thm cc thnh phn xung quanh IC s p
ng yu cu. Nu khng, mt cch tip cn hon ton ty thch s cn phi c s
dng. Nhng phng php tip cn khc nhau c tng quan trong vic thit k.
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S khi ca mch n p c hi tip .
S khi ca mch n p c hi tip .
* Mt s c im ca mch n p c hi tip : Cung cp in p mt chiu u ra khng i trong hai trng hp in p
u vo thay i hoc dng tiu th ca ti thay i , tuy nhin s thay i
ny phi c gii hn.
Cho in p mt chiu u ra c cht lng cao, gim thiu c hin tng
gn xoay chiu.
* Nguyn tc hot ng ca mch.
Mch ly mu s theo di in p u ra thng qua mt cu phn p to ra
( Ulm : p ly mu)
Mch to p chun => gim ly mt mc in p c nh (Uc : p chun )
Mch so snh s so snh hai in p ly mu Ulm v p chun Uc to
thnh in p iu khin.
Mch khuch i sa sai s khuch i p iu khin, sau a v iu
chnh s hot ng ca n cng xut theo hng ngc li, nu in p ra
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tng => thng qua mch hi tip iu chnh => n cng xut dn gim
=>in p ra gim xung . Ngc li nu in p ra gim => thng qua
mch hi tip iu chnh => n cng xut li dn tng => v in p ra tng
ln =>> kt qu in p u ra khng thay i.
Phn tch hot ng ca mch ngun c hi tip
in p u vo cn gn xoay chiuin p u ra bng phng
* ngha cc linh kin trn s .
T 2200F l t lc ngun chnh, lc in p sau chnh lu 18V , y cng
l in p u vo ca mch n p, in p ny c th tng gim khong
15%.
Q1 l n cng xut ngun cung cp dng in chnh cho ti , in p u ra
ca mch n p ly t chn C n Q1 v c gi tr 12V c nh .
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R1 l tr phn dng c cng xut ln ghnh bt mt phn dng in i qua
n cng xut.
Cu phn p R5, VR1 v R6 to ra p ly mu a vo chn B n Q2 .
Diode zener Dz v R4 to mt in p chun c nh so vi in p ra.
Q2 l n so snh v khuych i in p sai lch => a v iu khin s
hot ng ca n cng xut Q1.
R3 lin lc gia Q1 v Q2, R2 phn p cho Q1
* Nguyn l hot ng .
in p u ra s c xu hng thay i khi in p u vo thay i, hoc
dng tiu th thay i.
Gi s: Khi in p vo tng => in p ra tng => in p chn E n Q2
tng nhiu hn chn B ( do c Dz gim t chn E n Q2 ln Ura, cn Ulm
ch ly mt phn Ura ) do UBE gim => n Q2 dn gim => n Q1 dn
gim => in p ra gim xung. Tng t khi Uvo gim, thng qua mch
iu chnh => ta li thu c Ura tng. Thi gian iu chnh ca vng hi
tip rt nhanh khong vi giy v c cc t lc u ra loi b, khng
lm nh hng n cht lng ca in p mt chiu => kt qu l in p
u ra tng i phng.
Khi iu chnh bin tr VR1 , in p ly mu thay i, dn n Q2 thay
i , dn n Q1 thay i => kt qu l in p ra thay i, VR1 dng
iu chnh in p ra theo mun .
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C1 l t lc ngun chnh sau cu Diode chnh lu.
C2 l t lc u ra ca mch ngun tuyn tnh.
Cu phn p R4, VR1, R5 to ra in p ly mu ULM
R2 v Dz to ra p chun Uc
R3 lin lc gia Q3 v Q2, R1 nh thin cho n cng xut Q1 R6 l in tr phn dng, l in tr cng xut ln .
Q3 l n so snh v khuch i p d sai
Khuch i in p d sai
Q1 n cng xut ngun
=> Ngun lm vic trong di in p vo c th thay i 10%, in p ra
lun lun c nh .
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Mch iu chnh da trn phn t mch tch hp c sn LM317
Gii thiu v 317
Gii thiu LM 317
LM317 l linh kin n p b ni tip dng bin i v
n nh din p dng. N c th cp dng trn 1,5 A v in
p u ra c th bin thin t 1,25 V 37 V.
LM317 l linh kin tng i d s dng, in p cp cho
ti n nh hn so vi cc loi IC n p c nh.
Bn cnh u im l hiu sut cao hn so vi n p c nh,
loi IC ny cn c tch hp kh nng hn ch dng khi ngn
mch, bo v qu nhit trn ti,...
Hnh 3.7: Hnh dng thc t v s chn ca IC LM317
TO-220 l dng ng gi thng gp nht ca LM317 dng
cho cc ng dng thng thng, c th trang b thm tn
nhit cho IC ny.
* Cc chn ca LM317 bao gm:
1. Chn iu chnh in p
2. Ng ra in p
3. Ng vo in p
* Cc thng s ch yu:
lch ln nht gia in p ng vo v in p ng ra: V in
Vout 35 Volt (hay 40 Volt tu nh sn sut).
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Nhit gii hn: 2300C.
Nhit vn hnh: 00C n +1250C.
Nhit lu tr: -650C n +1250C.
Cng sut tiu th: Trong khong gii hn (ti a 20W).
iu kin lm vic thng thng: 5V Vin - Vout 35V.
in p quy chiu (Vref) t 1,2V 1,3V (Vref= Vout Vadj)
Dng cp cho chn iu chnh (Iadj) khng qu 100A.
* Cu trc bn trong ca LM317
IC LM317 bao gm 3 thnh phn sau:
- Chuyn mch ngun: L mt transistor loi NPN (bng ng-
c).
- B to in p quy chiu: in p quy chiu t trc, to
ra gi tr mu 1,25V.
- B khuch i (op-am): iu khin chuyn mch ngun.
Op-am c nhim v gi cho in p u ra bng gi tr in
p ti chn iu chnh (adj) tr i in p quy chiu.
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* Nguyn l iu chnh n nh in p ca IC LM317
in p ra ca LM317 c tnh theo cng thc:
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Hnh 3.8 Mt s s ng dng LM 317 thit k n LED chiu sng.
3.3.2 Cng ngh b bin i PWM
Ht nhn ca b bin i DC/DC lm vic trong ch PWM
Hnh 3.9 S khi b bin i DC/DC lm vic trong ch PWM
Vi quan im l mt h thng t ng ta c th xy dng di dng s cu
trc nh sau:
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S cc b bin i DC/DCS mch in
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Hnh 3.10 S nguyn l b bin i BUCK
B bin i BUCK l mt dng ca mch bin i dng bm, in p u ranh hn hoc bng in p u vo. Gi thit phn t kho l l tng th s
hnh 3.4 c biu din tng ng nh sau:
M t cc quan h dng in, in p ca b bin i BUCK di dng cc
phng trnh vi phn, khi phn t kho l l tng, cc phng trnh ny c xy
dng trn c s cc nh lut Kirchoff dng in v in p. Trng hp khi kho
thng1=u
, ta thy rng phn t i t trng thi phn cc ngc, tc l n khngdn dng, ngc li khi kho trng thi ngt 0=u , dng in s mc vng qua i
t
Trng hp khi 1=u
p dng nh lut Kirchoff theo dng in v in p ta nhn c cc
phng trnh sau:
Evdt
di
L +=
R
vi
dt
dvL =
Trng hp khi 0=u b bin i c m t bi phng trnh:
vdt
diL =
R
vi
dt
dvL =
Kt hp li ta c
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uEvdt
diL +=
R
vi
dt
dvL =
{ }1,0uTrong u xem nh l iu khin u vo, khi iu khin l lien tc trong
khong [0,1] th lc iu khin l gi tr trung binh v c k hiu avu v lc
h thng c dng
Euvdt
diL av+=
R
vi
dt
dvL =
Chng ta c th k hiu trong mt h bin mi
LCv
i
E
C
L
E
x
x 1,
10
01
2
1 =
=
Ta nhn c
avuxddx+= 21
Qx
xdtdx 2
12 =
Trong LC
RQ =
Mc tiu iu khin s l n nh in p u ra ln cn gi tr t mong
mun bng cch tng hp lut iu khin phn hi chou
, v d lut iu khinPWM, rng ca xung thay i tng ng vi gi tr trung bnh thay i
c tnh truyn t ca b bin i BUCK
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Hnh 3.11 S mch in b bin i BUCK
d
S
on
T
S
VT
tdttv
TV
S
== 0
00 )(1
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So snh hai phng php bin i ngun tuyn tnh v xung thy c hiu sut
ca hai phng php. i vi phng php tuyn tnh hiu sut bin i thp, i
vi phng php bin i xung th cho hiu sut cao hn.
3.4 Thit k, th nghim n LED cng sut
Trn c s s nguyn l ch ra trn hnh trn, cn c vo cng sut ca LED,
ta c la chn cho phn t:
-
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- tranzistor cng sut,
- tham s in cm ca cun dy,
- gi tr t in, v
- iot
Thit k mch in th nghim
Trn c s cc tham s, phn t tnh ton la chn ta s dng phn mm tr
gip thit k mch in t Altium designer
Trong phn th nghim n tp trung vo hai th nghim:
- Th nht l thay i mu sc ca LED bng cch thay i in p
- Th nghim th 2 l thay i cng sng bng cch thay i dng in
n a ra c m hnh th nghim chng minh cho cc ni dung l thuyt
trnh by.
-
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Kt lun chung
I. Kt qu thu c sau khi hon thnh n
Trn c s l thuyt v trnh by v th nghim v n LED cho thy hiu
qu ca vic s dng chiu sang s dng LED. LED yu cu mt ngun cung cp
mt chiu.
II. Kin ngh v hng pht trin
Cng ngh n LED ni ring v cng ngh bn dn pht
sng ni chung cn tr thnh chin lc u t pht trin cng
ngh cao ca Vit Nam bi v:
a. Cng ngh n LED s c mt th trng ln gii quyt
ngay nhu cu tit kim nng lng khi m du ho, kh
t, vn l ngun nng lng chnh to ra in nng trn
ton cu ni chung v Vit Nam ni ring, ang lm
vo nguy c cn kit v khng d ti to trong chu k
sng ca con ngi.
b. u t cho mt nh my sn xut chip pht sng v ng
gi chip hon chnh ch cn trn di 40 triu USD
mang li li sut 30% mi nm hay mi 18 thng nu c s
h tr cng ngh t cc chuyn gia Vit kiu u ngnh
nc ngoi. Trong khi , u t cho nh my sn xut ch
to linh kin bn dn vi mch s cn mt vn u t ban
u khng di 500 triu USD.
c. Quy trnh ch to n LED trng tng i n gin
hn sn phm vi mch vn a dng hn, i hi nhiu
sng to hn trong thit k.
d. Cng ngh LED trng u vit nht trn th gii hin ang
nm trong tay cc chuyn gia u ngnh ngi Vit ang
sinh sng v lm vic nc ngoi.
-
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Ti liu tham kho
[1] - Nguyn Vn Nh: in t cng sut . H BK HCM
. 2005
[2] - Joseph Vithayathil: Power Electronics . 1995
[3] - Mohan, Undeland, Robin: Power Electronics . 1997
[4] - Fang Lin Luo, Hong Ye: Advanced DC/DC Converter
. 2004
[5] - Abraham I. Pressman: Switching Power Supply
Design . 2001
[6] - Hunt, Lipsman, Rosenberg: A guide to MATLAB .
2003
[7] - Nguyn Phng Quang: Matlab & Simulink. NXB
KHKT . 2003[8] - A. Dumitrescu, D. Fodor, M. Rosu: Modeling and
simulation of
electric drive systems using Matlab/Simulink
environments . 1999
[9] - Linear Teachnology Corporation: Design Note,Application Note 51,54, 57,66, 67, 76, 84. 1993 - 2006
http://www.linear.com
[10] - Cybernet Systems Co., Switching Power Supply DesignUtilizing /Pspice - 2002
http://www.linear.com/http://www.linear.com/