The document discusses three phase bridge rectifiers. It describes three phase power supplies and defines rectifiers as devices that convert alternating current to direct current. It then discusses the construction, working principle, and types of three phase bridge rectifiers using six diodes. Applications include motor drives, battery chargers, and energy storage. Advantages are higher efficiency and larger DC output. Disadvantages include higher peak inverse voltage diodes which are more expensive.

1. ENGINEER ZIA UR RAHMAN (STAR)
GCUF Sahiwal Campus

2.  Three phase supply
 Rectifier
 Types of Three phase bridge rectifier
 Construction
 Working
 Calculations
 Application
 Advantages and Disadvantages
 Conclusion
Contents

3. Three Phase Bridge
Rectifier

4. Three Phase Supply
4 wires
3 “active” phases, A, B, C
1 “ground”, or “neutral”
Color Code
Phase A Red
Phase B Blue
Phase C Yellow
Neutral White or Gray

5. A rectifier is an electrical device that converts alternating
current (AC), which periodically reverses direction, to direct
current (DC), which flows in only one direction. The process
is known as rectification.
What is Rectifier ?

6. Three Phase Bridge Rectifier
It has two types:
 Half wave Rectifier  Full wave Rectifier

7. Circuit Diagram
Three Phase Bridge Rectifier

8. Three Phase Bridge Rectifier
 6 DIODES
 UPPER DIODES D1, D3, D5 CONSTITUTES +ve GROUP
 LOWER DIODES D4, D6, D2 CONSTITUTES -ve GROUP.
 THREE PHASE T / F FEEDING THE BRIDGE IS CONNECTED
IN DELTA-STAR
CONSTRUCTION USING

9. Conducting
angle
D1 D2 D3 D4 D5 D6
0° 60° 120° 180° 240° 300° 360°

14. Application
 Motor drives
 Battery chargers
 Alternators
 Energy storage
 Electric vehicles

15. Advantages Of Full Wave Rectifier
 Efficiency is higher
 The large DC output
 The ripple factor is less

16. Disadvantages Of Rectifier
 PIV rating of diode is higher.
 Higher PIV diodes are larger in
size and costlier.
 The cost of center tap transformer
is high

17. Conclusion:
Three-phase diode bridge rectifier
analyzed
Quantitative measures of rectifier
performance introduced.

18. any….!
Questions?