3-ph controlled rectfier working principal

It explains about the operation of 3-phase controlled rectifier.

1. Three Phase Controlled
Rectifiers

2. 2
3 Phase Controlled Rectifiers
•Operate from 3 phase ac supply voltage.
•They provide higher dc output voltage.
•Higher dc output power.
•Higher output voltage ripple frequency.
•Filtering requirements are simplified for smoothing out load voltage and load
current.
•Extensively used in high power variable speed industrial dc drives.
•Three single phase half-wave converters can be connected together to form a three
phase half-wave converter.

3. 3
 
 
 
0
0
0
sin ;
Max. Phase Voltage
2
sin
3
sin 120
2
sin
3
sin 120
sin 240
RN an m
m
YN bn m
m
BN cn m
m
m
v v V t
V
v v V t
V t
v v V t
V t
V t








 

 
  
 
 
 
 
  
 
 
 
 
V
A N
V
C N
V
B N
12 0
0
12 0
0
12 0
0

4. 3-Phase Half Wave Converter with R Load (6.7)

5.  
 
 
0
1
0
2
0
3
0
30
6
5
150
6
7
270
6
2
Each thytistor conducts for 120 or radians
3
T istriggeredat t
T istriggeredat t
T istriggeredat t

  

  

  

 
   
 
 
 
   
 
 
 
   
 
 

6. 6

8. 3-Phase Half Wave Converter with RL Load

9. 0
0
3 0
0
3 0
0
6 0
0
6 0
0
9 0
0
9 0
0
12 0
0
12 0
0
15 0
0
15 0
0
1 8 0
0
1 8 0
0
2 10
0
2 10
0
2 40
0
2 40
0
2 70
0
2 70
0
3 00
0
3 00
0
3 30
0
3 30
0
3 60
0
3 60
0
3 90
0
3 90
0
4 20
0
4 20
0
V
an

V
0

V
0
V
an


=30
0
=60
0
V
bn
V
bn
V
cn
V
cn
t
t
=30
0
=60
0

10. 10

11. 11

12. 12

13. 13

14. 14

15. 15

16. 16

17. 17

18. 18

19. 19
Three Phase Full Converter

20. 20

21. 21

22. 22

23. •EXAMPLE
Power Electronics •23

24. •SOLUTION
Power Electronics
•24

25. SINGLE-PHASE SEMI CONVERTERS

26. THREE-PHASE SEMI CONVERTERS
26

33. THREE-PHASE SEMI CONVERTERS