This document summarizes simulations of different DC supply converter circuits including: 1. An AC-AC transformer followed by an uncontrolled rectifier. 2. An uncontrolled rectifier followed by a DC-DC converter. 3. A controlled rectifier feeding a load. Tables show calculated performance parameters for the rectifiers including rectification ratio, form factor, transfer utilization factor, and ripple factor. Waveforms and harmonics analyses are also presented for outputs of the different converter configurations.

1. CONVERTER SIMULATIONS
DC Supply (12V @ 1A)
Presented By
FA13-R09-005 Muqadsa Iftikhar
FA13-R09-013 Zunaib Ali
FA13-R09-024 Madiha Naeem

2. DC Supply
Fig. 1(a): AC to AC Transformer followed by Uncontrolled Rectifier
LOAD
+
V0
-
I0
~
AC
DC
_
~
AC
AC
~
AC
Supply
220V ac is converted to desired value of ac and then uncontrolled rectifier is
used to convert it to DC.

3. DC Supply
Load
AC
Supply
+
V0
-
I0
DC
DC
_
~
AC
DC
_
_
Fig. 1(b): Uncontrolled Rectifier followed by DC-DC Converter
Uncontrolled rectifiers are used to produce a fixed dc from a fixed ac and at the
output of rectifier a dc chopper circuit is used which provide variable dc just by
changing the duty cycle

4. DC Supply
Fig. 1(a): Controlled Rectifier feeding Load
Load
AC
Supply
+
V0
-
I0
~
AC
DC
_
Applied voltage can be made variable by using controlled rectifiers which provide
variable dc from a fixed ac

5. DC Supply
Table: Performance Parameters for Rectifier

6. DC Supply
Performance Parameters for Rectifier
From formulas mentioned above we can say that:
•The lower the value of RR from unity the lower will be the circuit
performance.
•The greater the value of the FF from unity lower will be the circuit
performance.
• The lower the value of TUF from unity the lower will be the circuit
performance...
•The greater the value of the RF from zero lower will be the circuit
performance....

7. Conversion
Transformer followed by Uncontrolled Rectifier
Continuous
powergui
ac input
12.06
Voltage
1 2
Transformer
In1
Specturm
Scope4
Scope2
Scope10
signal rms
RMS4
R
0.999
Power Factor
v+
-
O/P Voltage
InMean
Mean Value1
InMean
Mean Value
signal
magnitude
angle
Fourier
Irms
I1rms
Theta
DSTF
DSPF
PF
zunaib
Embedded
MATLAB Function
0.999
Distortion Factor
1
Displacement Factor
D4
D3 D2
D1
1.005
Current
i+ -
Ammeter1
i
+ -
Ammeter

8. Conversion
Transformer followed by Uncontrolled Rectifier
0 120 240 360 480 600 720
0
20
40
60
80
100
frequency
HarmonicsMagnitude
Full wave
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035
0
5
10
15
20
time
RectifierOutpur
Full wave

9. Conversion
Transformer followed by Uncontrolled Rectifier
S.No Performance Parameters Calculated Values
1 Rectification ratio (RR) 0.81
2 Form factor (FF) 1.11
3 Transfer Utilization Factor (TUF) 0.81
4 Ripple Factor (RF) 0.482
Table # 2: Observed values of RR, FF, TUF & RF taken from Matlab command window

10. Conversion
Uncontrolled Rectifier followed by DC-DC Chopper
Continuous
powergui
v
+
-
Voltage Measurement
Scope3
Scope
274.4
Rectified Voltage
In Mean
Mean Value1
In Mean
Mean Value
[A]
From1
Diode3
Diode2
Diode1
Diode
Conn1
Conn2
Converter
C3
12.05
Buck Output
AC Voltage Source
Rectifier followed by Chopper

11. Conversion
Uncontrolled Rectifier followed by DC-DC Chopper
2
Conn2
1
Conn1
t
v
+
-
Vo V
R
Pulse
Generator
In Mean
Mean Value2
L
i
+
-
Io
g
C
E
IGBT/Diode [A]
Goto1
1.03
Display1
D
Clock
C2C1
A
Chopper

12. Conversion
Uncontrolled Rectifier followed by DC-DC Chopper
Chopper Output
0 0.005 0.01 0.015 0.02 0.025
-2
0
2
4
6
8
10
12
14
16
Output of Chopper
time
RectifierOutpur

13. Conversion
Uncontrolled Rectifier followed by DC-DC Chopper
0 120 240 360 480 600 720
0
10
20
30
40
50
60
70
80
90
100
frequency
HarmonicsMagnitude
rectifier with chopper
Output Voltage Equation
in case we use
Capacitive Filter
Value of Ra

14. Conversion
Controlled Rectifier
Continuous
pow ergui
v
+
-
Voltm
gm
ak
T4
gm
ak
T3
gm
ak
T2
gm
ak
T1
In1
Specturm & other blocks
Scope5
Scope1
Scope
signal rms
RMS4
R
0.9704
Power Factor
In Mean
Mean Value2
In Mean
Mean Value1
signal
magnitude
angle
Fourier
Irms
I1rms
Theta
DSTF
DSPF
PF
zunaib
Embedded
MATLAB Function
0.9762
Distortion Factor
0.994
Displacement Factor
12.4
Converter Output Voltage
1.008
Converter Output Current
i+
-
C1
i
+ -
C
AC
3 & 4
1 & 2

15. Conversion
Controlled Rectifier
0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018
-5
0
5
10
15
20
25
time
RectifierOutpur
Controlled

16. Conversion
Controlled Rectifier
0 120 240 360 480 600 720
0
20
40
60
80
100
120
frequency
HarmonicsMagnitude
Controlled Rectification

17. Conversion
Controlled Rectifier
Performance Parameters Calculated Values
RR 0.5629
FF 1.3328
TUF 0.4944
RF 0.8811