power-electronics-laboratory-manual-10ECL78.pdf - APPROVED...

APPROVED BY AICTE NEW DELHI, AFFILIATED TO VTU BELGAUM
DEPARTMENT OF ELECTRONICS AND COMMUNICATION &
ENGINEERING
POWER ELECTRONICS LABORATORY
LAB MANUAL – 10ECL78
2016-2017
VII SEMESTER
Prepared by: Reviewed by: Approved by:
Sathisha B M Kavitha M V Dr. A.A. Powly Thomas
Assistant professor Head of the Department Principal
Dept. of ECE Dept. of ECE GCEM
GCEM GCEM
81/1, 182/1, Hoodi Village, Sonnenahalli, K.R. Puram, Bengaluru, Karnataka-
560048.

INDEX
S.No Title Page No
1. Syllabus i
2. Course objective ii
3. Course outcome ii
4. Do’s & Don’t’s iii
5. List of experiments iv
6. Viva questions 77

i
SYLLABUS
POWER ELECTRONICS LAB
Subject Code: 10ECL78 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 SCR and DIAC.
2. Static characteristics of MOSFET and IGBT.
3. Controlled HWR and FWR using RC triggering circuit
4. SCR turn off using i) LC circuit ii) Auxiliary Commutation
5. UJT firing circuit for HWR and FWR circuits.
6. Generation of firing signals for thyristors/ trials using digital circuits / microprocessor.
7. AC voltage controller using triac – diac combination.
8. Single phase Fully Controlled Bridge Converter with R and R-L loads.
9. Voltage (Impulse) commutated chopper both constant frequency and variable frequency operations.
10. Speed control of a separately exited DC motor.
11. Speed control of universal motor.
12. Speed control of stepper motor.
13. Parallel / series inverter.
Note: Experiments to be conducted with isolation transformer and low voltage.

ii
Course Objectives:
 To study and analyze V-I characteristics of SCR and DIAC.
 To study and analyze V-I characteristics of MOSFET and IGBT.
 To study and analyze various waveforms across different circuit elements in Full and Half wave
rectifier using RC Firing circuit.
 To study and analyze various waveforms across different circuit elements in Full and Half wave
rectifier using UJT Firing circuit.
 To study and analyze various waveforms across different circuit elements in Full and Half wave
rectifier using Digital Firing circuit.
 To study and analyze various waveforms across different circuit elements various waveforms of AC
voltage regulator using TRIAC and DIAC combination.

To study and analyze Single phase Fully Controlled Bridge Converter with R and R-L loads.

To study and analyze Voltage (Impulse) commutated chopper

To study and analyze Speed control of a separately exited DC motor, Universal motor and stepper
motor.

To study and analyze various waveforms across different circuit elements in Parallel / series
inverter
Course Outcomes:
The student will have the Ability:

To conduct and analyze V-I characteristics of SCR and DIAC
.
 To conduct and analyze V-I characteristics of MOSFET and IGBT
 To conduct and analyze Full and Half wave rectifier using RC Firing circuit
 To conduct and analyze Full and Half wave rectifier using UJT Firing circuit
 To conduct and analyze Full and Half wave rectifier using Digital Firing circuit.