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Department of Electronics and Communication DSCE, Bangalore78 Power Electronics Laboratory Page 1 POWER ELECTRONICS LAB Subject Code: 06ECL78 IA Marks : 25 No. of Practical Hrs/Week: 03 Exam Hours : 03 Total no. of Practical Hrs: 42 Exam Marks : 50 1. Static characteristics of DIAC 2. Static characteristics of SCR 3. Static characteristics of MOSFET 4. Static characteristics of IGBT 5. Controlled HWR and FWR using RC triggering circuit 6. SCR turn off using LC circuit 7. SCR turn off using Auxiliary Commutation 8. UJT firing circuit for HWR and FWR circuits 9. Generation of firing signals for thyristors/ trials using digital circuits/ Microprocessor 10. AC voltage controller using TRIAC – DIAC combination 11. Single phase Fully Controlled Bridge Converter with R and RL loads 12. Voltage (Impulse) commutated chopper both constant frequency and Variable frequency operations 13. Speed control of a separately exited DC motor 14. Speed control of universal motor 15. Speed control of stepper motor 16. Parallel / series inverter
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Page 1: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 1

POWER ELECTRONICS LAB

Subject Code: 06ECL78 IA Marks : 25 No. of Practical Hrs/Week: 03 Exam Hours : 03 Total no. of Practical Hrs: 42 Exam Marks : 50

1. Static characteristics of DIAC

2. Static characteristics of SCR

3. Static characteristics of MOSFET

4. Static characteristics of IGBT

5. Controlled HWR and FWR using RC triggering circuit

6. SCR turn off using LC circuit

7. SCR turn off using Auxiliary Commutation

8. UJT firing circuit for HWR and FWR circuits

9. Generation of firing signals for thyristors/ trials using digital circuits/ Microprocessor 10. AC voltage controller using TRIAC – DIAC combination

11. Single phase Fully Controlled Bridge Converter with R and R‐L loads

12. Voltage (Impulse) commutated chopper both constant frequency and Variable frequency operations 13. Speed control of a separately exited DC motor

14. Speed control of universal motor

15. Speed control of stepper motor

16. Parallel / series inverter

Page 2: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 2

Set of Experiment

I ‐ Cycle

1. Static characteristics of DIAC

2. Static characteristics of SCR

3. Static characteristics of IGBT

4. Controlled HWR and FWR using RC triggering circuit

5. Speed control of a separately exited DC motor

6. Single phase Fully Controlled Bridge Converter with R and R‐L loads

7. Generation of firing signals for Thyristors/ trials using digital circuits/ Microprocessor

8. SCR turn off using LC circuit

II‐Cycle

1. Static characteristics of MOSFET

2. UJT firing circuit for HWR and FWR circuits

3. Voltage (Impulse) commutated chopper constant frequency and variable frequency Operations 4. Parallel / series inverter

5. Speed control of stepper motor

6. SCR turn off using Auxiliary Commutation

7. AC voltage controller using TRIAC – DIAC combination

8. Speed control of universal motor

Page 3: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 3

Experiment No.1

Static characteristics of DIAC

Aim : To determine the forward and reverse characteristic of DIAC

Apparatus Required: Resistor 1kΩ‐1No, Voltmeter (0‐60v)‐1 No, DIAC‐1No, Ammeter (0‐250mA)‐1No, Connecting Wires, Connecting Board‐1No. Circuit Diagram:

Procedure: (1). Rig up the circuit as shown in the circuit diagram (2). Switch on the Regulated power supply by keeping the voltage course fine in

minimum position (3). Increase the voltage in steps and note down the corresponding voltage and Current in the tabular column (4). Reduce the voltage to the minimum position and switch off the power supply (5). To determine the reverse characteristics interchange the DIAC terminals and repeat the above steps (6). Plot the graph of Voltage versus Current

Applications:

Page 4: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 4

Tabular Column: Forward

V ( volts) I (ma)

Reverse

V ( volts) I (ma)

Graph:

Result:

Page 5: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 5

Experiment No.2

Static characteristics of SCR

Aim: To determine the V‐I characteristics of the given SCR

Apparatus Required: Resistor 1kΩ, 470E/5w ‐1No, SCR TYN604/410‐1No, Voltmeter (0‐60v)‐1 No, Ammeter (0‐100mA)‐2No, connecting Board‐1No, Connecting Wires.

SYMBOL:

Circuit Diagram:

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Set Ig=7ma, Keeping Ig constant, vary the anode voltage VAK and note down

the anode current Ia and anode voltage Vak (3). Tabulate the readings and plot the graph of Vak Versus Ia (4). Repeat the above steps for for different gate current (Ig) (5). From the graph determine holding current (IH), Latching current (IL) and

Forward Break over voltage (VBO)

Page 6: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 6

Applications: Graph:

Tabular Column:

I g =_____________ma

V ak (volts) I a (mA)

IL = ____________ma IH =____________ma Result:

Page 7: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 7

Experiment No.3

Static characteristics of MOSFET

Aim: To obtain the drain and transfer characteristics of MOSFET

Apparatus Required: Resistor 10kΩ, 50E/5w ‐1No, MOSFET (IRF 450)‐1No, Voltmeter (0‐60v)‐1 No, Ammeter (0‐100mA)‐2No, Connecting Board‐1No, Connecting Wires. SYMBOL:

Circuit Diagram:

Procedure:

(1).Rig up the circuit as shown in the circuit diagram (2).Switch on the power supply and keep Vgs to a constant value (1, 2,3V etc) (3).By varying the voltage across drain and source and note down the

corresponding voltage Vds and current Id (4).Tabulate the readings plot the graph of V ds v/s Id for different Vgs determine Rd

Page 8: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 8

(5).To determine the transfer characteristics set Vds to a specified value and vary Vgs (6).For each variations of Vgs note down the drain current Id, tabulate the readings and plot the graph of Vgs v/s Id for constant Vds

(7). Determine the Tran conductance Gm and Amplification factor (µ) Rd = V ds / Id Gm= Id / Vgs µ = Gm* Rd Applications: Graph: Output Characteristics: Transfer Characteristics

Tabular Column: Output Characteristics

Vgs1= V ds (volts)

I d (mA)

Transfer Characteristics

Vds= V gs(volts)

I d (mA)

Result:

Vgs2= V ds (volts)

I d (mA)

Page 9: Pe Lab Manual e&c Dept Dsce

D

Po

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Aim: To plot

Apparatus

Circuit Diag

t of Electron

nics Laborato

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Required: Co

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ory

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Static c

Transfer ch

IGBT, Voltmonnecting W

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aracteristics

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Page 9

Page 10: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 10

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Switch on the supply by keeping in minimum position of Vge and Vce (3). Set the value for Vge=5.32v (4). Increase Vce in steps and note down the corresponding voltage of Vce and Current Ic (5).Tabulate the readings plot the graph of Ic versus Vce (6).To determine the transfer characteristics set Vce to a specified value (7). By increasing Vge in steps note down the corresponding values of Ic and plot the graph of Vge versus Ic for constant Vce Applications: Graph: Transfer Characteristics: Output Characteristics:

Tabular Column: V‐I Characteristics

Vge1= Vge2=

V ce (volts) I c(mA)

Vce1= Vce2= V ge(volts)

I d(mA) Result:

Transfer Characteristics

Page 11: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 11

Experiment No.5

Controlled HWR and FWR using RC triggering Circuit

Aim: To rig up a circuit for controlled HWR and FWR using RC Triggering circuit

Apparatus Required: SCR (2P4M)‐2No, Diode (BY127)‐2No, Resistor 100E/5W, Pot 1M, Capacitor (0.47µF),Transformer (12‐0‐12) Voltmeter(0‐60v), Connecting Board, Connecting Wires and CRO probe.

Circuit Diagram:

HALF WAVE RECTIFIER

FULL WAVE RECTIFIER

v

v

230V 50HZ

Page 12: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 12

INPUT AND OUTPUT WAVEFORMS:

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Switch on the Power supply (3). Observe the wave forms across SCR and Load for HWR and FWR (4). By varying the potentiometer (1M) note down the delay angle and output voltage (5).Compare the results with the theoretical value Vdc=Vm [1+cosα]/2π for HWR, Vdc=Vm [1+cosα]/π for FWR Tabular Column:

Delay Angle(α) V practical (volts)

V theoretical (volts) Applications: Result:

Page 13: Pe Lab Manual e&c Dept Dsce

D

Po

A A

C

Department

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SCR t

Aim: To stud Circuit

Apparatus

Circuit Diag

t of Electron

nics Laborato

turn‐on cir

dy the turn ot

Required: 1 P C

gram:

nics and Co

ory

Ex

rcuit using

on of SCR us

SCR (2P4M)100E/5W,PoPulse TransfConnecting W

mmunicati

xperiment

Synchron

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)‐2No,UJT(2ot100K,Capaformer, VoltmWires, and C

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t No.6

ized UJT re

ynchronous

N2646),Diodcitor(0.47µFmeter(0‐60vCRO probe.

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angalore‐78

P

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WR and FW

No,Resistor1mer(12‐0‐12)ng Board,

8

age 13

WR

1k, ,

Page 14: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 14

HALF WAVE CONTROLLER

FULL WAVE CONTROLLER

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Switch on the A.C supply (3). Observe the wave forms at Vs, Va, Vz, Vc Vb1, VSCR and across the load (4). By varying the potentiometer (100K) note down the delay angle and output

voltage Applications:

SCR

6V/12V

1k

230V

B!6V/12V

R5

100E/5W

B2

2N2646

VB1

100k

VC

Vz1k

50Hz

VS 1k

Z6.5

0.47MF

VA

E

E

VB1

VS

2N2646

6V/12V

230V/50HZ

VA1k

B1

R8

1k

0.47MF

6V/12V

100k

Z 6.5

D

100E/5W

B2

1k

VC

SCR1

SCR2

VZVz

D

Page 15: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 15

Result:

Page 16: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 16

Experiment No.7

SCR turn‐off using LC circuit

Aim: To study the basic working of LC Commutation Apparatus Required: Multimeter, Patch chords, CRO probes Circuit Diagram:

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Switch on the triggering circuit and observe the triggering pulses with the

help of CRO (3). Switch on the chopper switch keeping the potentiometer of the triggering

circuit in Minimum position (4). Note down the output Voltage, Duty cycle and Plot the graph

Tabular Column:

Applications:

VL (volts) Ton (ms) Toff (ms) T (ms) Duty Cycle

Page 17: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 17

Graph: VL Duty cycle Result:

Page 18: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 18

Experiment No.8

SCR turn‐off using Auxilliary Commutation

Aim: To study the SCR Turn Off using Auxilliary Commutation Apparatus Required: Multimeter, Patch chords, CRO probes, Lamp load. Circuit Diagram:

Page 19: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 19

Procedure: (1). Rig up the circuit as shown in the circuit diagram (2). Switch on the triggering circuit and observe the triggering pulses with the help of CRO (3). Keep the selector switch of the DC supply in the second position i.e. 30V (4). Switch on the DC supply of the firing circuit keeping the chopper switch in the Off Position (5). Switch on the chopper switch keeping the potentiometer of the triggering circuit in the Minimum position (6). Observe the waveforms across the SCR, capacitor and Load (7). By varying the firing pulses measure Ton, Toff and output voltage across the Load (8). Compare the practical value with the theoretical value Vdc=Ton/Ton+Toff x Vin, Vdc=Ton/T x Vin, Vdc = duty cycle x Vin (9).Plot the graph of Duty cycle v/s output voltage Tabular Column:

Applications: Graph:

Result:

VL (volts) Ton (ms) Toff (ms) T (ms) Duty Cycle

Page 20: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 20

Experiment No.9

Digital Triggering of SCR

Aim: To study the triggering of SCR using digital triggering Method Apparatus Required: Multimeter, Transformer (12‐0‐12), Resistor 100E/5w, Patch chords, CRO probes.

Circuit Diagram:

To HWR

Page 21: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 21

Procedure:

(1). Switch on the Digital Triggering circuit module and check the Triggering pulses of the digital triggering using CRO

(2). Note down the wave forms at different terminal points of the module [A,C, Tp, Tn] (3). Rig up the circuit as shown in the circuit diagram (4). Vary the Triggering angle in steps and note down the output voltage [vdc]

across the load (5). Bring back the Triggering angle to zero and switch off the module (6). Plot the graph of vdc v/s α

Tabular Column:

Load Voltage (volts) Delay angle (α)

Applications: Graph:

Result:

Page 22: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 22

Experiment No.10

AC voltage controller using TRIAC‐DIAC combination

Aim: To study AC voltage controller Apparatus Required: TRIAC module, differential module, Lamp, Multimeter, BNC to BNC probe. Circuit Diagram:

Procedure: (1). Rig up the circuit as shown in the circuit diagram (2). Switch on the power supply to the circuit (3). Vary the potentiometer and note down the load voltage and delay angle (4). Plot the graph of delay angle versus voltage

Tabular Column:

Load Voltage (volts) Delay angle (α)

Applications: Graph:

Result:

Page 23: Pe Lab Manual e&c Dept Dsce

D

Po

A A C

Department

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Single

Aim: To stud Conver

Apparatus

Circuit Diag

t of Electron

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phase full

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Required: In

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ory

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Page 24: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 24

Procedure:

(1). Rig up the circuit as shown in the circuit diagram (2). Switch on the Triggering circuit and check the Triggering pulses with the help of CRO Keeping the potentiometer in minimum position (3). By varying the Triggering pulses note down the corresponding output voltage and Delay angle (4). Plot the graph of delay angle V/s output voltage (5). Decrease the Triggering pulses to the minimum position and switch off the circuit

Tabular Column:

Load Voltage (volts) Delay angle (α)

Applications: Graph:

Result:

Page 25: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 25

Experiment No.12

Speed control of separately excited DC Motor Aim: To study the speed control of separately excited DC motor using single phase full Wave half controlled rectifier Apparatus Required: Isolation transformer, patch cords, Multimeter, and Tachometer. Circuit Diagram:

Procedure: (1). Rig up the circuit as shown in the circuit diagram (2). Switch on the firing circuit and check the firing pulses with the help of CRO (3). Switch on the AC supply of the isolation transformer (4). By varying the firing circuit note down the output voltage and speed

Tabular Column:

Applications: Graph:

Result:

Load Voltage (volts) Speed (rpm)

Page 26: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 26

Experiment No.13

Speed Control of Universal Motor

Aim: To study the speed control of Universal Motor Apparatus Required: TRIAC module, differential module, Universal motor, Multimeter.

Procedure: (1). Rig up the circuit as shown in the circuit diagram (2). Switch on the power supply to the circuit (3). Vary the potentiometer and note down the load voltage and speed (4). Plot the graph of voltage v/s speed

Tabular Column:

Graph:

Result:

Load Voltage (volts) Speed (rpm)

Page 27: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 27

A1 A2 B1 B2Red Green Blue Black

0 1 0 10 1 1 01 0 1 01 0 0 1

Q1 Q2 Q3 Q4

Experiment No.14

Stepper Motor

Aim: To study the speed control of stepper motor Apparatus Required: Stepper motor, Stepper motor controller. Circuit Diagram:

SWITCHING LOGIC SEQUENCE

Half Step Full Step

A1 A2 B1 B2Red Green Blue Black

0 1 0 10 0 0 11 0 0 11 0 0 01 0 1 00 0 1 00 1 1 00 1 0 0

BLACK

RED

BLACK

GREEN

LOGIC CONTROLLER

BLUE

FREEWHEELING DIODES

SWITCHING TRANSISTORS

RS

+ ve

WHITE RS

-ve

Page 28: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 28

Procedure: (1). Connect A1, A2, B1 and B2 leads of stepper motor to the corresponding Terminals of the Control module (2). Set the appropriate number of steps (3). Set the stepper motor to operate in half step or full step mode (4). Observe the rotation of the motor for different type of settings Motor Ratings: Permanent magnet, bifilar wound two phase Steps per revaluation : 200 No. of Leads : 06 Step angle : 1.80 + 02 – 0.10 non cumulative. 3 kg.cm = 0.1 N.m = 13.0 OZ – in Applications: Graph: Result:

Page 29: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 29

Experiment No.15

Series Inverter

Aim: To study the basic working of series Inverter Apparatus Required: Inverter module, Patch chord, Multimeter, CRO probes, Resistor 50 Ω/5w, DC Power supply. Circuit Diagram:

Procedure: (1). Switch on the module to check the triggering pulses on the CRO (2). Rig up the circuits as shown in the circuits diagram (3). Switch on the power supply and observe the wave forms across the load (4). Measure the output voltage and output frequency by varying the frequency of the triggering circuits (5). Repeat the above procedure for different values of Inductance and

Capacitance (6). Bring back the triggering angle to zero and switch off the module

Tabular Column:

Inductance (H) Capacitance(µf) Frequency (Hz)

VL (volts)

T1 Firing Circuit T2

G

K

G K

Page 30: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 30

Applications: Graph:

Result:

Resonance Frequency [Fr] =

Page 31: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 31

Experiment No.16

Parallel Inverter

Aim: To study the basic working of parallel Inverter

Apparatus Required: Inverter module, Patch chords, Triggering module. Circuit Diagram:

Procedure: (1). Rig up the circuits as shown in the circuits diagram (2).Connect the +15, ‐15, Gnd and supply to the Triggering circuit. Check the

output of the trigger circuit at various points (3).Connect the gate of SCR1 and SCR2 to the triggering circuit and oscilloscope to the load (4).Observe the waveform and measure the frequency across the load

Applications: Graph:

Result:

Vdc

C

D2

D1

LKVL

-SCR1

+

SCR2

RL

T1 Firing Circuit T2

G

K

GK

Page 32: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 32

MODEL QUESTION BANK

[1] Obtain the static characteristics of SCR and hence determine the holding current [2] Conduct a suitable experiment to determine VI‐ characteristics of uni‐directional four

layer switches. Determine breakdown voltage and holding current [3] Obtain a variable DC output voltage using LC communication and plot the graph of Duty

cycle v/s output voltage [4] Rig up and test an oscillator chopper circuit to produce variable DC output. Draw the

output voltage v/s duty cycle [5] Conduct a suitable experiment to obtain an output voltage of a fully controlled bridge

rectifier using resistive load. Plot the output voltage v/s delay angle [6] Conduct a suitable experiment to obtain an output voltage of a fully controlled bridge

rectifier for R and RL load with and without free wheeling diode. Plot the output voltage v/s delay angle for R load

[7] Conduct a suitable experiment to convert fixed DC voltage to variable DC voltage with the duty cycle of ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ and verify

[8] Conduct a suitable experiment to convert fixed DC voltage to variable DC voltage with a fixed frequency

[9] Conduct a suitable experiment to control the speed of a given DC motor using single phase half controlled bridge rectifier. Draw the speed v/s output voltage

[10] Control the RPM and step size of a stepper motor tabulate the readings for different settings

[11] Conduct a suitable experiment to obtain the AC output from a DC input using a basic series inverter

[12] Conduct a suitable experiment to verify the operating principle of a single phase series inverter

[13] For single phase fully controlled bridge rectifier circuit with R load plot the graph of Alpha v/s output voltage using digital firing circuit

[14] By conducting suitable experiment on a given MOSFET obtain the drain and transfer characteristics

[15] By conducting suitable experiment on a given MOSFET determine Rd, µ, gm [16] Conduct a suitable experiment to draw VI characteristics of the given IGBT and comment

on its switching characteristics [17] Conduct a suitable experiment to draw transfer and output characteristics of given IGBT [18] Conduct a suitable experiment to control intensity of light using bidirectional switch and

plot output voltage v/s delay angle [19] Conduct a suitable experiment to control the speed of a single phase universal motor and

plot the graph of output voltage v/s speed [20] Conduct a suitable experiment to trigger SCR using a UJT relaxation oscillator [21] Using RC only rig up a suitable experiment to trigger SCR and hence obtain the output

voltages for different angles

Page 33: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

Power Electronics Laboratory Page 33

[22] Using RC triggering for HWR and FWR obtain firing angle v/s output voltage. Study the relevant waveforms

[23] Conduct a suitable experiment to obtain V‐I characteristics of a given 4‐layer 2 terminal device. Find the breakdown voltage for both directions

Page 34: Pe Lab Manual e&c Dept Dsce

Department of Electronics and Communication DSCE, Bangalore‐78

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`````````````````

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Department of Electronics and Communication DSCE, Bangalore‐78

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