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8/2/2019 07_chuong 3_bien Doi Dc_dong Lien Tuc
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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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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.
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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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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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:
CC B BIN I DNG LIN TC
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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:
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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2. Mchbinitng p S nguyn l
Chcnng cc linh kin: S, L, C, D1, R. Cc githit khi phn gii:
C
D1L
RS
+
-
Vidc
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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3. Mchbinitng-gim p S nguyn l
Chcnng cc linh kin: S, L, C, D1, R. Cc githit khi phn gii:
+
-
VidcL
S
R
D1
C
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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3.Dng sng b bin i tng-gim p
t
t
t
S
TOFFTON
vL
iL
Vo
Vi
ILmax
ILmin
IL iL
DT
CC B BIN I DNG LIN TC
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3.Dng sng b bin i tng-gim p
t
t
t
S
TOFFTON
vL
iL
Vo
Vi
ILmax
ILmin
IL iL
DT
CC B BIN I DNG LIN TC
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3.Dng sng b bin i tng-gim p
t
t
t
S
TOFFTON
vL
iL
Vo
Vi
ILmax
ILmin
IL iL
DT
CC B BIN I DNG LIN TC
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3.Dng sng b bin i tng-gim p
t
t
t
S
TOFFTON
vL
iL
Vo
Vi
ILmax
ILmin
IL iL
DT
CC B BIN I DNG LIN TC
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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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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
CC B BIN I DNG LIN TC
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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
CC B BIN I DNG LIN TC
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CC B BIN I DNG IN TC
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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
CC B BIN I DNG LIN TC
CC B BIN I DNG LIN TC
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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 LIN TC
CC B BIN I DNG KHNG LIN TC
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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
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BIN I DCDNG KHNG LIN
TC