Điều khiển điều áp xoay chiều 3 pha

4.5 §Æc ®iÓm ®iÒu khiÓn ®iÒu
¸p ba pha
Nguyªn lÝ ®iÒu khiÓn
§iÒu khiÓn b»ng c¸ch ®ªmh xung
§iÒu khiÓn b»ng chïm xung
I. Nguyªn lÝ ®iÒu khiÓn ®iÒu ¸p ba pha
§iÒu khiÓn ®iÒu ¸p ba pha cã thÓ coi nh chØnh l u cÇu ba pha
T
2
T
3
T
5
T
1
T
4
T
6
a)
T
5
T
2
T
1
T
6
T
4
c)

T
1
T
2
T
4
T
3
T
5
T
6
b)
Ba c¸ch cÊp xung ®iÒu khiÓn
•
CÊp xung ®«ng thêi cho c¸c van ë nhãm NA vµ nhãm
NKvÝ dô nh h×nh vÏ:
•
Cã thÓ cã ba c¸ch cÊp xung ®iÒu khiÓn
T
1
T
2
T
3
T
5
T
4
T

6
A
1
B
1
C
1
A
B
C
Z
A
Z
B
Z
C
0
0
T
2
T
3
T
5
T
1
T
4
T
6

A
1
B
1 C
1
A
B
C
Z
A
Z
B
Z
C
T
2
T
3
T
5
T
4
T
6
A
1
B
1
C
1

A
B
C
0
Z
A
Z
B
Z
C
T
1
T
1
T
2
T
3
T
5
T
4
T
6
A
1
B
1
A
B

C
Z
A
Z
B
Z
C
0
X
C
X
§
T
1
T
4
,T
6
T
2
T
3
,T
5
T
3
T
6
,T
4

T
4
T
5
,T
1
T
5
T
2
,T
4
T
6
T
1
,T
3
X
C
X
§
T
1
T
4
T
2
T
3

T
3
T
6
T
4
T
5
T
5
T
2
T
6
T
1
X
C
X
§
T
1
T
4
T
2
T
3
T
3

T
6
T
4
T
5
T
5
T
2
T
6
T
1
•
§iÒu khiÓn b»ng biÕn ¸p xung hai cuén d©y
H×nh 3.33 §Öm xung b»ng biÕn ¸p.
M§K
T
6
tíi T
5
T
6
T
1
T
4
M§K
T

1
M§K
T
4
•
§Öm xung tr íc tÇng khuÕch ®¹i
+15V
M§KT
1
M§KT
6
H
tíi T
4
T
1
H×nh 3.34 §Öm xung tr íc tÇng khuÕch ®¹i
•
§iÒu khiÓn b»ng xung ®¬n
A B C
α
t
t
t
t
t
t
π/2
π
X

T1
X
T2
X
T3
X
T4
X
T5
X
T6
1
2 3
4
5
6
7 8 9 10 11 12 13
14
X
3
X
23
X
2
X
52
X
1
X
61

X
14
X
5
X
6
X
36
X
45
X
3
X
4
X
14
T
1
T
2
T
3
T
4
T
5
T
6
•
M¹ch ®iÒu khiÓn

V
6
A
5
A
4
+12V
T
6
+15V
-12V
UC
U
®f1
U
®f2
D
1
D
2
VR
1
R
1
R
2
A
A
1
+

-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
R
4
U
®k
R
5
R
6
A
3
-
+
D
V
5

T
5
UB
U
®f1
U
®f2
D
1
D
2
VR
1
R
1
R
2
A
A
1
+
-
B
R
3
R
4
D
3
Tr

1
C
A
2
-
+
R
4
U
®k
R
5
R
6
A
3
-
+
D
V
3
T
3
V
4
A
5
A
4
+12V

T
4
+15V
-12V
UA
U
®f1
U
®f2
D
1
D
2
VR
1
R
1
R
2
A
A
1
+
-
B
R
3
R
4
D

3
Tr
1
C
A
2
-
+
R
4
U
®k
R
5
R
6
A
3
-
+
D
V
1
T
1
D
4
V
2
A

5
A
4
+12V
T
2
+15V
-12V
H1
H2
H3
H4
H5
H6
-12V
Udk
§iÒu khiÓn ®iÒu ¸p ba pha khi van lµ triac
U
A
U
®f1
U
®f2
D
1
D
2
VR
1
R

1
R
2
A
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
R
4
U
®k
R
5
R
6

A
3
-
+
DA
R
7
D
4
D
5
X
U
A
R
5
Tr
2
Tr
3
U
B
U
®f1
U
®f2
D
1
D
2

VR
1
R
1
R
2
A
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
R
4
U
®k
R

5
R
6
A
3
-
+
DA
R
7
D
4
D
5
X
U
B
R
5
Tr
2
Tr
3
U
C
U
®f1
U
®f2
D

1
D
2
VR
1
R
1
R
2
A
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
R
4

U
®k
R
5
R
6
A
3
-
+
DA
R
7
D
4
D
5
X
U
C
R
5
Tr
2
Tr
3
-12V
-12V
-12V
+12V

+12V
+12V
+15V
HA
HB
HC
-12V
TA
TB
TC
•
§iÒu khiÓn b»ng chïm xung
A B C
α
H×nh 3.39 §iÒu khiÓn ba pha b»ng chïm xung
t
t
t
t
t
t
t
X
1
X
2
X
3
X
4

X
5
X
6
+
A6
D
4
Uv
U
®f
1
U
R
2
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A

2
-
+
C
1
R
5
A
3
-
+
D
AND
®f
2
R
2
A
1
+
-
B
R
3
R
4
D
3
Tr
1

C
A
2
-
+
C
1
R
5
A
3
-
+
D
D
4
-
AND
T
5
T
6
T
3
T
4
+15V
T
2
D

4
Uv
U
®f
1
U
R
2
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
C
1
R
5

A
3
-
+
D
AND
®f
2
R
2
A
1
+
-
B
R
3
R
4
D
3
Tr
1
C
A
2
-
+
C
1

R
5
A
3
-
+
D
D
4
AND
+15V
+15V
D
4
Uv
U
®f
1
U
R
2
A
1
+
-
B
R
3
R
4

D
3
Tr
1
C
A
2
-
+
C
1
R
5
A
3
-
+
D
AND
®f
2
R
2
A
1
+
-
B
R
3

R
4
D
3
Tr
1
C
A
2
-
+
C
1
R
5
A
3
-
+
D
D
4
AND
+15V
∼
∼
∼