07_chuong 3_bien Doi Dc_dong Lien Tuc

8/2/2019 07_chuong 3_bien Doi Dc_dong Lien Tuc

1/40

1

CHNG 3: BIN I DCo GII THIU

o CC B BIN I DNG LIN TC

1. Mchbinigim p (Buck Converter)

2. Mchbinitng p (Boost Converter)

3. Mchbinitnggim p


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2

GII THIU

Dng lin tc l dng trong cuncm lc

no cng c trdng trong ton chu k.

c in p DC ln ngi ta thng

ghp nhiubnitip nhau.

Mch boost converter c thtngin p

v thay thcc vin pin.


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3

GII THIU

Vi hai vin pin ta c th dng mch

Boost converter tng in p ln s

dng cho cc xe in v h thng n

trang tr.

c in p DC ln ngi ta thng

ghp nhiubnitip nhau.


4/40

4

CC B BIN I DNG LIN TC

LS

C

+

-

VidcRD1

1. Mchbinigim p S nguyn l

Chcnng cc linh kin: S, L, C, D1, R. Cc githit khi phn gii:


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5

S

D1

C

R

L

+

-

Vidc

1. Mchbinigim p Ch ON

dt

diLVVVVVV LiLLi 00

L

VV

dt

di iL 0

Khi S ng, do diode phn cc nghch nnngng, ta c dng

inchy qua cuncm.inthcuncmbng:

)1(0

0

DTL

VVi

L

VV

DT

i

t

i

dt

di

i

swonL

iLLL



6/40

6

L

S

D1

C

R

+

-

Vidc

1. Mchbinigim p Ch OFF

Khi bth, diode tr nn phn ccthun nndn, v do cho dng incuncmchyqua hnh. inthqua cuncm khi bth:

L

V

dt

di

dt

diLVV LLL

0

0

)2(1

1

0

0

TDL

Vi

L

V

TD

i

t

i

swoffL

LL



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7

1. Dng sng mch bin i gim p

t

t

t

t

S

TOFFTON

vL

iL

iC

Vi

Vi-Vo

-Vo

ILmax

ILmin

IL=IO iL

iC

DT t



8/40

8


t

t

t

t

S

TOFFTON

vL

iL

iC

Vi

Vi-Vo

-Vo

ILmax

ILmin

IL=IO iL

iC

DT t



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9


t

t

t

t

S

TOFFTON

vL

iL

iC

Vi

Vi-Vo

-Vo

ILmax

ILmin

IL=IO iL

iC

DT t



10/40

10


t

t

t

t

S

TOFFTON

vL

iL

iC

Vi

Vi-Vo

-Vo

ILmax

ILmin

IL=IO iL

iC

DT t



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11

1. Mchbinigim p Dng sng

t

t

t

t

S

TOFFTON

vL

iL

iC

Vi

Vi-Vo

-Vo

ILmax

ILmin

IL=IO iL

iC

DT t

0 OFFLONL ii

Do s thay i tng

cng dng in chyqua cun cm khi Sng v khi S h lbng khng:



12/40

12

1. Mchbinigim p

01)2()1(

0

00

TDL

VDT

L

VV

ii

i

swoffLswonL

ii

on

i VVVT

tDVV 00

TDL

VDT

L

VDVDT

L

VVi i

swonL

10000

Hot ng thng trc i hi dng incuncmticui chu k giao hon bngvitrsti lc btungha l sthay itng

cng trong dng cun cm trn 1 chu k lbng khng:



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13

1. Mchbinigim p Dng in trung bnh qua cuncm: Dng in max v min qua cuncm:

Gi trcctiucuncm: dn sng ng ra:

R

VII RL

0

L

t

RV

Lf

D

RVI

off

2

1

2

1100max

L

t

RV

Lf

D

RVI

off

2

1

2

1100min

RTDRfDL

21

21min

2

0

0

8

1

LCf

D

V

V



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14

2. Mchbinitng p S nguyn l


C

D1L

RS

+

-

Vidc



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15

2. Mchbinitng p Ch ON

Khi S ng, diode phn cc nghch nnngng, dng in qua cun L to nn inthVLcho bi:+

-

Vidc

C

R

VL=Vi

S

D1L

V

dt

di

dt

diLVV iLLiL

LV

DTi

ti iLL

)3(L

DTVi i

swonL



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16

2. Mchbinitng p Ch OFF

Khi S h, diode phn ccthun nn dn chodng qua cun cm L to nn in th ca

cuncm VL:D1

R

C+

-

VidcS

VL=Vi-Vo

L

VV

dt

di

dt

diLVVV iLLiL

0

0

LVV

TD

i

t

i iLL 0

1

)4(10

L

TDVVi i

swoffL



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17

2. Dng sng mch bin i tng p

iL

t

t

t

S

TOFFTON

vL

iLVi-Vo

Vi

ILmax

ILminIL

DT (1-D)T

t

Imax

Imin

iD



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18


iL

t

t

t

S

TOFFTON

vL

iLVi-Vo

Vi

ILmax

ILminIL

DT (1-D)T

t

Imax

Imin

iD



19/40

19


iL

t

t

t

S

TOFFTON

vL

iLVi-Vo

Vi

ILmax

ILminIL

DT (1-D)T

t

Imax

Imin

iD



20/40

20


iL

t

t

t

S

TOFFTON

vL

iLVi-Vo

Vi

ILmax

ILminIL

DT (1-D)T

t

Imax

Imin

iD



21/40


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22

2. Mchbinitng p

hot ng thng trc, s thay i tngcng dng trong cuncmphibng khng,theo (3) v (4) ta c:

0

1)4()3(

0

0

L

TDVV

L

DTV

ii

ii

swoffLswonL

D

VV i 1

0

L

DTV

L

TDD

VV

L

TDVVi i

i

i

i

Lswoff

1110



23/40

23

2. Mchbinitng p Dng in trung bnh qua cuncm: Dng in max v min qua cuncm:

Gi trcctiucuncm:

dn sng ng ra:

RD

VI iL 2

1

LDTV

RD

ViII ii

swon

LL

2122max

LDTV

RD

ViII ii

swoff

LL

2122min

f

RDDL

RDDLf

2

1

2

1 2min

2

min

RCf

D

V

V

0

0



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24

3. Mchbinitng-gim p S nguyn l


+

-

VidcL

S

R

D1

C



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25

3. Mchbinitng-gim p Ch ON

Khi S ng, diode phn cc nghch nnngng, dng in qua cun L to nn inthVLcho bi:+

-

Vidc

C

R

S D1

L

L

V

dt

di

dt

diLVV iLLiL

L

V

DT

i

t

i iLL

)5(L

DTVi i

swonL



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26

3. Mchbinitng-gim p Ch OFF

Khi S h, dng trong cun cm khng thayi tc thi, diode phn cc thun nn dn

cho dng qua t v tito nn inthcacuncm VL:

R

S D1

+

-

Vidc

C

L

L

V

dt

di

dt

diLVV LLL

0

0

LV

TDi

ti LL 0

1

)6(1

0

L

TDVi

swoffL



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27

3.Dng sng b bin i tng-gim p

t

t

t

S

TOFFTON

vL

iL

Vo

Vi

ILmax

ILmin

IL iL

DT



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28


t

t

t

S

TOFFTON

vL

iL

Vo

Vi

ILmax

ILmin

IL iL

DT



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29


t

t

t

S

TOFFTON

vL

iL

Vo

Vi

ILmax

ILmin

IL iL

DT



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30


t

t

t

S

TOFFTON

vL

iL

Vo

Vi

ILmax

ILmin

IL iL

DT



31/40


32/40


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33

Dng in trung bnh qua cuncm:

Dng in max v min qua cuncm: Gi trcctiucuncm:

dn sng ng ra:

2

2

2

0

)1(

1

DR

DV

RDV

D

DV

RDV

VI i

i

i

i

L

LDTV

RD

DViII ii

swon

LL

2122max

L

DTV

RD

DViII ii

swoff

LL

2122min

f

RDL

RDLf

2

1

2

12

min

2

min

RCf

DV

RC

DTVV 00

0

CC B BIN I DNG LIN TC3. Mch bin i tng-gim p


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34

4. BchuyniCuk S nguyn l

Chcnng cc linh kin: S, L1, L2, C1,

C2, D1, R.

Cc githit khi phn gii:

+

-

Vs

C1 L2L1

RS

C2D1



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35

4. BchuyniCuk Ch ON

Ta c cc mchtngng khi S ngnh hnh

in th trung bnh ca t C1 c tnh theo nh

lut KirchhoffvinthTrsinth trung bnh qua cuncmbng khng

chthngtrc

R

C2

L1

S

iC1=-iL2

+

-

Vs

L2

D1

01VVV ic

21 Lswonc

Ii



36/40

CC B BIN I DNG IN TC


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37

Cng suthpthcatibngvi cng sutcpin:

NuD> 0,5: inthra lnhninthvo.

NuD< 0,5: inth

ra nhhninthvo.

0111 TDiDTi swoffcswonc

D

D

I

ITDIDTI

L

L

LL

1

012

1

12

iL

L

LLiiV

V

I

IIVIVPP 0

2

1

2010

D

DVV i

10

4. B chuyn i Cuk




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38

Lu rng cc linh kinL2, C2 v Rc cng cuhnh nhbchuynih th v dng qua cuncm c cng dngvibchuynihth. Do ,

dn sng hoc s thay i trong in th racngsbngvicabchuynihth. :

dn sng ng ra C1:2

220

0

8

1

fCL

D

V

V

HAYD

D

fRC

VTD

C

IdtI

Cv iL

T

DTLc

1

11

2

11

11

1

1

fRC

DVvc

1

0

1

4. B chuyn i Cuk


CC B BIN I DNG KHNG LIN TC


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39

CC B BIN I DNG KHNG LIN TC Stnggim ca dng qua cuncm c thtnhbng cch xem inthcuncm khi bt S ng: inthqua L2khi bt S ng:

Vi dng lin tc trong cun cm, dng trungbnh philnhn 1/2 s thay i trong dng. Ta ctrscctiuca cc cuncm:

4. B chuyn i Cuk:

dt

diLVv LiL

1

11 fL

DV

L

DTVi

L

V

DT

i iiL

iL

11

1

1

1

dt

diLVVVVv L

iiL

2

2002

Dng in iL2 l: fL DVLDTVi iiL22

2

Df

RDL

2

12

min,1

f

RDL

2

1min,2


40/40

40

BIN I DCDNG KHNG LIN

TC

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07_chuong 3_bien Doi Dc_dong Lien Tuc