chadalawada ramanamma engineering college lab.pdf · 2. apply the triggering pulses to scr1 &...

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)


PRECAUTIONS:



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.


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:



7. To switch off the inverter, switch off the DC suuply.


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:


2. Avoid loose connections..


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


PRECAUTIONS:



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


PROCEDURE




12.In “WEBENCH”designer block enter your power supply requirements and click “START

design”

13.Select your power supply solutions and click “choose part”


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


PROCEDURE





19. In “WEBENCH”designer block enter your power supply requirements and click “START design”

20. Select your power supply solutions and click “choose part”


22. Click on “open design”on any one of solution

23. Click on “design document” and download it.

chadalawada ramanamma engineering college lab.pdf · 2. apply the triggering pulses to scr1 &...

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