POWER ELECTRONICS
EE 785 07
Course Objectives:
- To get an overview of different types of power semi-conductor devices and their switching characteristics.
- To understand the operation, characteristics and performance parameters of controlled rectifiers.
- To study the operation, switching techniques and basic topologies of Choppers.
- To learn the different modulation techniques of pulse width modulated inverters and to understand the harmonic reduction methods.
- To study simple applications
- Power Semi-conductor Devices[9 hours]
- Introduction
- Power Diodes
- Power BJT
- Thyristor Characteristics
- Two Transistor model of Thyristor
- Series and Parallel operation of Thyristors
- SCR, TRIAC, Power MOSFET, GTO, IGBT and SIT
- Device Structures and Characteristics
- Turn ON- Turn OFF methods and Circuits
- Protections, Ratings and applications
- Handling precautions and power dissipation
- Controlled Rectifiers[8 hours]
- Single Phase / Three Phase, Half wave / full wave, half controlled /fully controlled converters with R, RL and RLE loads
- Continuous and discontinuous current operations
- Evaluation of performance parameters
- Effects of source inductance
- Power factor improvement techniques
- 6-pulse and 12-pulse converters
- Dual converters
- Choppers[11 hours]
- DC Choppers
- Introduction
- Principle of operation,
- Analysis with waveforms of Step-Down and Step-Up choppers
- Buck, boost and buck-boost Converter
- AC Choppers:
- Operation of 1-phase voltage regulator with R, RL loads
- 1-phase step up & step down cycloconverters
- Inverters[9 hours]
- Single phase and three phase (both 120º mode and 180ºmode) inverters
- PWM techniques: Sinusoidal PWM, modified sinusoidalPWM, multiple PWM
- Introduction to space vector modulations
- Voltage and harmonic control
- Series resonant inverter
- Current source inverter
- Applications[8 hours]
- Speed control of DC motor using rectifiers and choppers
- Uninterruptible Power Supply (UPS)
- Switched mode Power Supply (SMPS)
- Battery Charger
- Introduction to shunt and series compensators
Practical:
There should be experiments on
- Basic characteristics of power transistors, diodes thyristors (SCRs)
- Single phase, full wave and bridge rectifiers with resistive loads
- Single phase SCR controller with UJT trigger
- Three phase bridge rectifiers with diodes and with SCRs
- Rectification for inductive loads
- Various types of Choppers
- Speed Control of DC Motor
References:
- M.H. Rashid, “Power Electronics: Circuits, Devices and Applications”, Pearson Education.
- Philip T. Krein, “Elements of Power Electronics”, Oxford University Press.
- Jay P. Agarwal, “Power Electronic Systems – Theory and Design”, Prentice Hall.
- Ned Mohan, Tore M. Undeland, William P. Robbins, “Power Electronics, Converters, Application and Design”, John Wiley and Sons.
- Cyril.W.Lander, “Power Electronics”, McGraw – Hill.
- M.D. Singh, K.B. Khanchandani, “Power Electronics”, Tata McGraw – Hill.
Evaluation Scheme:
The questions will cover all the chapters of the syllabus. The evaluation scheme will be as indicated in the table below:
Chapters |
Hours |
Marks Distribution* |
1 |
9 |
16 |
2 |
8 |
14 |
3 |
11 |
20 |
4 |
9 |
16 |
5 |
8 |
14 |
Total |
45 |
80 |
*There could be a minor deviation in Marks distribution
|