chương 3 thiết kế bộ biến đổi dc

8/2/2019 Chng 3 Thit k b bin i DC

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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
http://www.kythuatvien.com/forum/uploads/images/2009/5/26/kythuatvien_Attachments_195715_Nguon_hoitiep1.gif


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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 .
http://www.kythuatvien.com/forum/uploads/images/2009/5/26/kythuatvien_Attachments_195715_Nguontuyentinh.gif


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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 .
http://www.kythuatvien.com/forum/uploads/images/2009/5/26/kythuatvien_Attachments_195715_Nguon_TV_noidia.gif


15/28

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).
http://www.flickr.com/photos/34249786@N04/4181689122/


16/28

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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19/28

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


22/28

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


23/28

Hnh 3.11 S mch in b bin i BUCK

d

S

on

T

S

VT

tdttv

TV

S

== 0

00 )(1


24/28


25/28

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.


28/28

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/

chương 3 thiết kế bộ biến đổi dc

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