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LABORATORY MANUAL

ELE054

INDUSTRIAL ELECTRONICS AND ELECTRIC DRIVES

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TABLE OF CONTENT

S. No. Title of the Experiment Page No.

1 To draw V-I characteristics of SCR 3

2 To draw V-I characteristics of TRIAC 5

3 To draw V-I characteristics of DIAC 8

4 To draw V-I characteristics of UJT 10

5 To design uni-junction transistor as relaxation oscillator 12

6 To design a triggering circuit for SCR using UJT and

observe its waveform

14

7 To design half wave controlled rectifier using RC

triggering and observe the waveform

16

8 To design full wave controlled rectifier using RC

triggering and observe the waveform.

19

9 To Fabricate a Fan Speed Regulator using TRIAC 22

10 To observe the wave shape across SCR and load of an

illumination control circuit

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Experiment No. 1

1. Experiment: To draw V-I characteristics of an SCR

Equipment required:

S. No. Name of Equipment Range

1 SCR(MCR100) 600V/10A

2 Ammeter 0-50mA

3 Ammeter 0-500mA

4 Voltmeter 0-50V

2. Learning Objectives: To find relationship between voltage and current at a particular gate

current.

3. Circuit Diagram:

4. Outline of the Procedure:

a. Connections are made as shown in diagram.

b. Value of gate current IG is adjusted by adjusting VGG.

c. By varying the anode-cathode supply voltage VAA gradually in step-by-step, note down the

corresponding values of VAK & IA. Note down VAK & IA at the instant of firing of SCR and

after firing then increases the supply voltage VAA. Note down corresponding values of VAK &

IA.

d. The point at which SCR fires, gives the value of break over voltage VBO.

e. A graph of VAK Vs IA is to be plotted.

f. The gate supply voltage VGG is to be switched off.

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g. Observe the ammeter reading by reducing the anode- cathode supply voltage VAA. The point

at which the ammeter reading suddenly goes to zero gives the value of Holding Current IH.

h. Repeat the steps.

5. Observation Table:

6. Required Results:

Characteristics of SCR were studied & found that SCR turned on when IA > IL & remained in on state until IA > IH

7. Cautions:

a. Make the connections and get it checked by the teacher.

b. Do not give supply in the absence of teacher.

c. Use datasheet in order to check the rating and pins of the components.

8. Learning outcomes: to be written by the students in 50-70 words.

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Experiment No. 2

1. Experiment: To draw V-I characteristics of a TRIAC.

2. Equipment required:

S.

No.

Name of component Range

1 TRIAC (BT136)

2 Ammeter (0-30mA)

3 Voltmeter (0-30V)

4 Wattage resistors (100Ω/20W)

5 Power supply (0-30V)

3. Learning objective:

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Required results:

Observation Table:

Note down the values of break over voltages of TRIAC

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Relationship:

Characteristics of Triac were studied between anode current and voltage across MT1&MT2.

Graph: Plot the V-I characteristics of TRIAC.

Cautions:

(1)DC supply should be increased slowly in steps.

(2)Always connect ammeter in series and voltmeter in parallel. Learning Outcome: To be written by students in their own words.

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Experiment No. 3

1. Experiment: To draw V-I characteristics of a DIAC.

2. Equipment Required:

S.

N

o.

Non Consumable Component Range

1. Diac(DB8-9) 40-50V

2. One DC ammeter

3. One DC voltmeter

4. Power supply 60V dc Supply

5 Resistor 2.2kohm, 1.2Kohm

3. Learning objective: To know about how Diac works without gate and about its break over voltage.

4. Circuit Diagram:

2.2 Kῼ , 0.5W Load(1.2Kῼ, 0.5W)

mA

DC Supply MT1 V

Diac

MT2


1. Connect the circuit as per the diagram.

2. Switch ON the power and increase the voltage at 70 volt.

3. Increase the supply Vcc till the DIAC trigger.

4. Increase the Vcc slowly and note the current at which the diac triggers.

5. Supply push pull reset key change the voltmeter back to 75 V.

6. Gradually introduce the resistance in series with anode circuit by means of potentiometer

note the state voltage and anode current.

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7. Observations :

To note down the values of break over voltage VBO of diac.

8. Relationship: Characteristics of Triac were studied between anode current and voltage across MT1&MT2.

9. Graph: Plot the V-I characteristics of Diac.

10. Cautions: (1)DC supply should be increased slowly in steps.

(2)Always connect ammeter in series and voltmeter in parallel.

11. Learning Outcome: To be written by students in their own words.

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Experiment No. 4

1. Experiment: To draw V-I characteristics of an UJT.


S.

No.

Non Consumable

Component

Range

1. UJT (2N2646)

2. Ammeter (0-30mA)

3. Power supply (0-30V)

4. Variable Resistor 2.2 KΩ

5. Voltmeter (0-30V)

6. Fixed resistance (50Ω)

3. Learning objective:

To study the V-I characteristics of a UJT and to observe valley point and negative

resistance region.

4. Circuit

Diag.

mA 2.2Kῼ, 0.5W

UJT

VEE VBE

50 ῼ

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1. Make the connections as per the circuit diagram in fig.

2. Select the Vbb at 10v DC.

3. Note down the voltage of Ve and Ia

4. Vary the voltage Ve

5. Note Down the change in Ve and Ie

6. Record the values of peak voltage, valley voltage , valley current and peak current.

6. Required results:

7. Observations: Note down the values of emitter voltage and emitter current. Also note down

valley voltage.

8. Graph: Plot graph between VE & IE.

9. Cautions:

10. Learning Outcome: To be written by the student …

(1) Always connect the voltmeter in parallel & ammeter in series.

(2)Connection should be proper & tight.

(3)Switch ‘ON’ the supply after completing the circuit.

(4)DC supply should be increased slowly in steps.

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Experiment No. 5

1. Experiment: To plot input and output waveforms of UJT relaxation oscillator.

2. Equipment Required:

S. No. Non Consumable Component Range

1. UJT( 2N2646)

2. One DC ammeter

3. One AC Ammeter

4. One AC voltmeter

5. One DC voltmeter

6. Power Supply

3. Learning objective: To know about how UJT produces oscillations during charging and discharging of

a capacitor.

4. Circuit Diagram:


1. Make the connections as per Circuit diagram

2. Switch ON the DC supply. 3. Connect the CRO across the Capacitor.

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7. Observation Table:

VBB.

Emitter Voltage Emitter Current

8. Relationship: Plot the waveform of VE voltage across capacitor and Vo voltage at output

terminals.

9. Graph: Draw the graph of voltages across capacitor and voltage across resistor.

10. Cautions

11. Learning Outcome: To be written by students in their own words.

(1) Always connect the voltmeter in parallel & ammeter in series.

(2)Connection should be proper & tight.

(3)Switch ‘ON’ the supply after completing the circuit.

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Experiment No. 6

1. Experiment: To design a triggering circuit for SCR using UJT and observe its

waveform.


S. No. Name of Equipment Range

1 SCR(MCR100) 600V/12A

UJT(2N2646)

Capacitor 100µF/35V

2 Ammeter 0-50mA

3 Ammeter 0-500mA

4 Voltmeter 0-50V

5 CRO

POT 0-5Kohm

3. Learning Objectives: To learn the triggering of SCR using UJT.

4. Circuit Diagram:


a. Connections are made as shown in diagram.

b. Switch On the power supply and vary the POT and observe the waveform

across the SCR

c. Draw the waveforms at different firing angles.


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Hence verified the firing scheme of UJT triggering circuit and observe the

waveform across the load and device SCR. From the experiment it is concluded

that it is possible to vary the firing angle from 00 to 180

0.

7. Cautions:





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Experiment No. 7

1. Experiment: To design half wave controlled rectifier using RC triggering

and observe the waveform.


S.No. Name of Component Range Quantity

1 Transformer 230V/50Hz 1

2 Resistors 100 ohms 2

3 SCR TY604 600v/10A 1

4 Diode 1

5 POT 500K 1

6 Capacitor 1

3. Learning Objectives: To learn SCR control circuit.

4. Circuit Diagram:

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5. Outline of procedure:

6. Required Results: Check the waveforms across the load.

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7. Cautions:




d. Test the circuit with small voltage supply either 12V or 24 volt and a small

load.


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Experiment No. 8

1. Experiment: To design full wave controlled rectifier using RC triggering and

observe the waveform.


S.No. Name of Component Range Quantity

1 Transformer 230V/50Hz 1

2 Resistors 100 ohms 2

3 SCR TY604 600v/10A 1

4 Diode 1

5 POT 500K 1

6 Capacitor 1


4. Circuit Diagram:

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7. Cautions:





load.


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Experiment No. 9

1. Experiment: To Fabricate a Fan Speed Regulator using TRIAC


3. Learning Objectives: To learn TRIAC control circuit.

4. Circuit Diagram:

5. Outline of procedure: 1) Assemble the circuit on a bread board.

2) The load whether lamp/fan should be less than 200 watt.


7. Cautions:





load.


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Experiment No. 10

1. Experiment: Observe the wave shape across SCR and load of an illumination

control circuit



4. Circuit Diagram:

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7. Cautions:





load.


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