Your Federal Quarterly Tax Payments are due April 15th

# Three-Phase Bridge Rectifier by Jv24D2A

VIEWS: 17 PAGES: 18

• pg 1
```									Three-Phase Power
Definitions

• 4 wires
– 3 “active” phases, A, B, C
– 1 “ground”, or “neutral”
• Color Code
– Phase A     Red
– Phase B     Black
– Phase C     Blue
– Neutral     White or Gray
Phasor Diagram
Delta-Connected Sources

VLINE = V
Phasor Diagram, VAB as reference
Look at the Currents

I = ILINE / 3
Y-Connected Sources
Phasor Diagram with A as reference
Complete Phasor Diagram

VLINE = 3V
Look at the Currents

I = ILINE
Three-Phase Bridge Rectifier
Conduction Sequence
Average Output Voltage, Vdc

T
1
Vdc 
T    f (t )dt
0


2 6
Vdc      3Vm cos td (t )
2 0
6
3 3
Vdc      Vm  1.654Vm

rms Output Voltage
1
                            2

 2    6

       3Vm cos td (t ) 
2   2
Vrms
2
      0                   
 6                        
1
3 9 3     2
Vrms    
 2 4   Vm
        
Vrms    1.6554Vm
Diode Currents

3Vm
Im       peak
R
1

                           2

 4                      
6
Ir        I m cos td (t ) 
2    2

2 0

                        

I r  0.5518I m
Transformer Secondary Current
1

                             2

 8                        
6
Is         I m cos td (t ) 
2    2

2


0


1
2  1   2           2
I s  I m    sin           
  6 2   6        
I s  0.7804 I m
Instantaneous Output Voltage

2            2
v0 (t )  0.9549Vm (1  cos(6t )      cos(12t )  ...
35           143

```
To top