Post on 25-Dec-2019
LAB MANUAL
ON
POWERELECTRONICS AND SIMULATION LAB
2018-19
III B.TECH II SEM
Mr.Sk.Wahab
Assistant Professor
CHADALAWADA RAMANAMMA ENGINEERING COLLEGE (AUTONOMOUS)
Chadalawada Nagar, Renigunta Road, Tirupati – 517 506
Department of Electrical and Electronics Engineering
EXPERIMENT NO: 01
GATE FIRING CIRCUITS FOR SCR’S
AIM:
To study the operation of R and RC firing circuit for SCR.
APPARATUS REQUIRED:
SL.NO.
NAME OF THE APPARATUS
RANGE QUANTITY
1.
Control potentiometer
5k
1no.
2.
Diode
INS402
1no.
3.
Thyristor
TYN619
1no.
4.
Resistive load
129/600V
1no.
5.
Connecting probes
-
As per required.
CIRCUIT DIAGRAM:
RESISTANCE FIRING CIRCUIT:
Fig.2(a). Resistance firing circuit.
RC FIRING CIRCUIT:
Fig.2(b). RC firing circuit.
MODEL WAVEFORMS:
RESISTANCE FIRNG CIRCUIT:
RC FIRING CIRCUIT:
PROCEDURE:
RESISTANCE FIRING CIRCUIT:
1. Connections are made as per the circuit diagram.
2. Keep the potentiometer R1 in minimum position (maximum resistance in the circuit)
3. Turn on the power switch.
4. Observe the output voltage waveform, SCR voltage and gate signals for various firing angle .
5. Observe the range of firing angle control.
RC FIRING CIRCUIT:
1. Connections are made as per the circuit diagram.
2. Keep the potentiometer R1 in minimum position (maximum resistance in the circuit).
3. Turn on the power switch.
4. Observe the output voltage waveform, SCR voltage and gate signals for various firing angle.
5. Observe the range of firing angle control.
TABULAR COLUMN:
(a) Resistive firing circuit
Sl.no. Amplitude TON TOFF
(b) RC firing circuit
Sl.no. Amplitude TON TOFF
PRECAUTIONS:
1. Avoid loose connections.
2. Make sure that the firing angles are proper before connecting the circuit.
RESULT:
Studied the operation of R and RC firing circuit for SCR for different firing angles.
EXPERIMENT NO: 02
SINGLE PHASE AC VOLTAGE CONTROLLER USING
R AND RL LOADS
AIM:
1. To study the principle of operation of single phase AC voltage controller.
2. To obtain the output voltage across R and R-L loads for various firing angles by
Conducting suitable experiment.
APPARATUS REQUIRED:
1. Single phase AC voltage controller module.
2. DMM or AC Voltmeter (0-30V) MI.
3. CRO.
SPECIFICATIONS:
SCR
SCR = TYN612.
Maximum anode to cathode voltage (Vak) = 600V.
Maximum anode current (Ia) = 12 A.
Maximum gate to anode voltage (Vga) = 18V.
Snubber circuit
Snubber resistance - 500 Ω, 5 W.
Snubber capacitance - 0.1µF, 1200V.
Load components
Load resistance (R) = 225Ω, 5 W
Load inductance (L) = 48.5mH.
CIRCUIT DIAGRAM:
Fig. Circuit diagram of single phase AC voltage controller with
R load.
Fig. Circuit diagram of single phase AC voltage controller with
R-L load.
MODEL WAVEFORMS:
Fig. Waveforms of single phase AC voltage controller with R load.
Fig. Waveforms of single phase AC voltage controller with R-L load.
PROCEDURE
1) Turn ON the trainer module.
2) Turn ON the 24V AC supply.
3) Switch ON the debounce logic switch.
4) Vary the control voltage knob to fix the firing angle α, from 0 to 180˚(π rad) in steps of 30˚.
5) For each α value, note down the output voltage for R load and tabulate the value in Table 1.
Also trace the output waveforms for each firing angle.
6) For each α value, note down the output voltage and extinction angle (β) for R-L load and
tabulate the values in Table 2. Also trace the output waveforms for each firing angle.
7) Compare the measured output voltage with the theoretically calculated output
voltage as given in equations (1) and (2).
TABULAR COLUMN:
Table 1. Experimental results for R load
Sl.No.
FIRING ANGLE(α)
Theoretical Output
Voltage
Vo,RMS (V)
Practical output
voltage
Vo,RMS (V)
Div.
Deg.
Rad.
Table 2. Experimental results for R-L load
Sl.No.
FIRING
ANGLE(α)
EXTINCTION
ANGLE(β)
Theoretical
Output
Voltage
Vo,RMS (V)
Practical
output
voltage
Vo,RMS (V)
Div.
Deg.
Rad.
Div.
Deg.
Rad.
FORMULAE USED:
For R Load
For R-L Load
PRECAUTIONS
Avoid loose connections.
Make sure that the firing angles are proper before connecting the circuit.
Before giving connections, ensure all the switches are in OFF position.
RESULT
Thus, the operation of single phase AC voltage controller was studied and the output voltage for
R and R-L loads with different firing angles were obtained.
EXPERIMENT NO: 03
SINGLE PHASE FULLY CONTROLLED BRIDGE CONVERTER
WITH R AND RL LOADS
AIM:
To study the operation of single phase fully controlled converter with R and RL loads and
to observe the waveforms across the load.
APPARATUS REQUIRED:
SL.NO. NAME OF THE
APPARATUS
RANGE QUANTITY
1. Single phase fully
converter circuit. - 1no.
2. Single phase
converter trigger
circuit
- 1no.
3.
Isolated transformer 1kw/230V/50HZ 1no.
4.
Resistive load 150/5A 1no.
CIRCUIT DIAGRAM:
FOR R-LOAD
FOR RL LOAD
MODEL WAVEFORMS:
FOR R LOAD
FOR RL LOAD
PROCEDURE:
1. Make the connections as per the circuit diagram..
2. Keep the multiplication factor of the CRO’s probe at the maximum position.
3. Switch on the thyristor kit and firing circuit kit.
4. Keep the firing circuit knob at the 180 position.
5. Vary the firing angle in steps.
6. Note down the voltmeter reading and waveform from the CRO.
7. Switch off the power supply and disconnect.
TABULAR COLUMN:
FOR R-LOAD
Sl.no. Input
voltage
Firing angle Output voltage(V) Output current(A)
Theoretical Practical Theoretical Practical
FOR RL-LOAD
Sl.no. Input
voltage
Firing angle Output voltage(V) Output current(A)
Theoretical Practical Theoretical Practical
PRECAUTIONS:
1. Avoid loose connections.
2. Make sure that the firing angles are proper before connecting the circuit.
RESULT:
Thus we have studied the operation of single phase fully controlled converter with R &
RL load and observed the output waveforms.
EXPERIMENT NO: 04
SINGLE PHASE SERIES INVERTER WITH R AND RL LOADS
AIM:
To study the operation of series inverter circuit and to observe the output waveforms.
APPARATUS REQUIRED:
1. Series inverter circuit kit
2. CRO
3. DC regulated power supply
4. Connecting probes
CIRCUIT DIAGRAM:
MODEL WAVEFORMS:
PROCEDURE:
1. Switch ON the supply & observe for the power indication.
2. Check the firing pulses for both thyristors individually on CRO.
3. Measure the DC supply.
4. Switch off the supply and connect the circuit as per the circuit diagram.
5. Observe the output voltage waveform across the output.
6. Vary the frequency and observe and note down the change in the waveform with
frequency.
TABULAR COLUMN:
Sl.No. Frequency Position Input Voltage(V) Output
Voltage(V)
TON TOFF
PRECAUTIONS:
1. Connections are made carefully.
2. Avoid loose connections.
3. To switch off the inverter, switch off the DC suuply.
4. Switch off the triggering pulses which will lead to short circuit.
RESULT:
Thus we have studied the series inverter and observed the output waveforms.
EXPERIMENT NO: 05
SINGLE PHASE PARALLEL INVERTER WITH R AND
RL LOADS
AIM:
To study the operation of single phase parallel inverter and to observe the output
waveforms for R and RL loads.
APPARATUS REQUIRED:
SL.NO.
NAME OF THE APPARATUS RANGE QUANTITY
1.
Parallel inverter circuit - 1no.
2.
Regulated power supply
- 1no.
3.
CRO - 1no.
4.
Rheostat 50ohms 1no.
5.
Inductor (0-150)mh/5A 1no.
6.
Connecting probes - As per required
CIRCUIT DIAGRAM:
MODEL WAVE FORMS:
PROCEDURE:
1. Connect the circuit as per the circuit diagram connect an external voltage sup[ply across the
Vdc terminals.
2. Apply the triggering pulses to SCR1 & SCR2 .
3. Keep the triggering frequency minimum.
4. Switch ON the CRO, experiment kit and the external power supply.
5. Observe the output waveforms in the CRO. Change the frequency and observe the change in
waveform with frequency. Note down the voltage values for different frequencies.
6. Keep the frequency knob in the minimum position and switch off the supply.
TABULAR COLUMN:
Sl.No. VIN(V) Amplitude Firing
Angle
Frequency
Position
Time
Division
Voltage
Division
TON
(msec)
TOFF
(msec)
PRECAUTIONS:
5. Connections are made carefully.
6. Avoid loose connections.
7. To switch off the inverter, switch off the DC suuply.
8. Switch off the triggering pulses which will lead to short circuit.
RESULT:
Thus we have studied the 1-phase parallel inverter and also observed the output
waveforms for R and RL loads.
EXPERIMENT NO: 06
DC JONES CHOPPER WITH R AND RL LOADS
AIM: To study the operation of DC Jones chopper.
APPARATUS REQUIRED:
SL.NO.
NAME OF THE APPARATUS RANGE QUANTITY
1.
DC-Chopper firing circuit - 1no.
2.
Regulated power supply (0-30)V 1no.
3.
Patch cards - As per required
CIRCUIT DIAGRAM:
MODEL WAVEFORMS:
PROCEDURE:
1. Connect the circuit as per the circuit diagram.
2. Switch on the power supply after making necessary connections for the DC chopper
firing unit.
3. Check trigger pulses by varying duty cycle and frequency.
4. Make the inner connections in the power circuit.
5. Apply variable DC source to the DC supply.
6. Initially set DC supply to 10V.
7. Connect a resistive load and connect respective trigger outputs from the firing to the
respective SCR’S in the power circuit.
8. Switch on the DC supply and observe the voltage waveforms across the load i.e.,
chopper DC wave form.
9. If commutations fail we can see only DC voltage.
10. In this case switch off DC supply and switch off pulses and check the connections and
try again.
11. Observe the voltage across load, capacitor, across main SCR and auxiliary SCR, by
varying duty cycle and frequency potentiometer.
TABULAR COLUMN:
Sl.no. Amplitude Input
voltage(V)
Frequency
(Hz)
Duty
cycle(%)
TON
(msec)
TOFF
(msec)
PRECAUTIONS:
1. Connections are made carefully.
2. Avoid loose connections..
3. Switch off the triggering pulses which will lead to short circuit.
RESULT:
Thus DC-Jones chopper was studied and wave forms are observed.
EXPERIMENT NO: 07
SINGLE PHASE HALF CONTROLLED CONVERTER WITH R
AND RL LOADS
AIM:
To study the operation of single-phase half controlled rectifier and to observe the
waveforms across the loads.
APPARATUS REQUIRED:
Sl.No.
NAME OF THE
APPARATUS
RANGE QUANTITY
1.
Single phase half
controlled power
circuit
_ 1no.
2.
Single phase
converter triggering
circuit
_ 1no.
3.
Isolation transformer 1kva, 50Hz, 230V 1no.
4.
Resistive load 150/5A 1no.
5. Connecting probes _
As per required
CIRCUIT DIAGRAM:
FOR R LOAD
FOR RL LOAD
MODEL WAVE FORMS:
FOR R LOAD
FOR RL LOAD
PROCEDURE:
1. Switch on the main supply to the firing circuit.
2. Observe all the test points by varying the firing angle.
3. Then observe the trigger outputs and their phase sequence, make sure that all the trigger
outputs are proper before connecting to the power circuit.
4. The trigger output pulse width as we vary the firing angle potentiometer.
5. Next make the connections in the power circuit.
6. Connect 30V tapping of the secondary transformer to the circuit. Connect the rheostat
between load points give firing pulses from the firing circuit to the MCB. Switch on the
trigger outputs and note down the voltage waveforms across load and devices.
7. Draw the waveforms across load and devices for different firing angle.
8. Repeat the same for different input voltage upto maximum voltage as provided in the
isolation transformer.
9. Repeat the same for RL load with and without free wheeling diode and observe the
waveforms.
TABULAR COLUMN:
Sl.No. INPUT
VOLTAGE
FIRING
ANGLE
OUTPUT VOLTAGE OUTPUT CURRENT
Theoretical Practical Theoretical Practical
PRECAUTIONS:
1. Avoid loose connections.
2. Make sure that the firing angles are proper before connecting the circuit.
RESULT:
Thus we have studied the operation of single phase half controlled rectifier and observed
the waveforms.
EXPERIMENT NO: 08
Design a low cost boost converter
Aim:
To Design a low cost boost converter deriving from 5V USB to 12V,100mA
APPARATUS
Personal computer
Texas instrument Webench software
PROCEDURE
1. OPEN “TEXAS INSTRUMENTS” website
2. Login into your account
3. Select “go to my account
4. Go to “MENU”and select “WEBENCHdesign center”
5. In “WEBENCH”designer block enter your power supply requirements and click “START design”
6. Select your power supply solutions and click “choose part”
7. Automatically generated different topologies of boost converter are displayed
8.Click on “open design”on any one of solution
9Click on “design document” and download it.
EXPERIMENT NO: 09
Design a low cost and power efficient buck converter
Aim:
To Design a low cost and power efficient buck converter that could be used as a USB charger
for mobile devices deriving its power from an automotive battery
APPARATUS
Personal computer
Texas instrument Webench software
PROCEDURE
8. OPEN “TEXAS INSTRUMENTS” website
9. Login into your account
10. Select “go to my account
11. Go to “MENU”and select “WEBENCHdesign center”
12.In “WEBENCH”designer block enter your power supply requirements and click “START
design”
13.Select your power supply solutions and click “choose part”
12. Automatically generated different topologies of boost converter are displayed
13. Click on “open design”on any one of solution
14. Click on “design document” and download it.
EXPERIMENT NO: 10
Design a low cost synchronous buck converter
Aim:
To Design a low cost synchronous buck converter
APPARATUS
Personal computer
Texas instrument Webench software
PROCEDURE
15. OPEN “TEXAS INSTRUMENTS” website
16. Login into your account
17. Select “go to my account
18. Go to “MENU”and select “WEBENCHdesign center”
19. In “WEBENCH”designer block enter your power supply requirements and click “START design”
20. Select your power supply solutions and click “choose part”
21. Automatically generated different topologies of boost converter are displayed
22. Click on “open design”on any one of solution
23. Click on “design document” and download it.