Power Electronics

EE3591

POWER ELECTRONICS

COURSE OBJECTIVES:

• To understand the various applications of power electronic devices for conversion, control and conditioning of the electrical power and to get an overview of different types of power semiconductor devices and their dynamic characteristics.

• To understand the operation, characteristics and performance parameters of controlled rectifiers.

• To study the operation, switching techniques and basic topologies of DC-DC switching regulators.

• To learn the different modulation techniques of pulse width modulated inverters and to understand harmonic reduction methods.

• To study the operation of AC voltage controller and various configurations of AC voltage controller.

UNIT I

SWITCHING POWER SUPPLIES

MOSFET dynamic behavior - driver and snubber circuits - low power high switching frequency per circuit switching Power supplies, buck, boost, buck-boost converters - Isolated topologies - resonant converters - switching loss calculations and thermal design.

UNIT II

INVERTERS

IGBT: Static and dynamic behavior - single phase half bridge and full bridge inverters - VSI (1phase and three phase inverters square wave operation) - Voltage control of inverters single, multi pulse, sinusoidal, space vector modulation techniques- various harmonic elimination techniques-CSI

UNIT III

UNCONTROLLED RECTIFIERS

Power Diode - half wave rectifier - mid-point secondary transformer based full wave rectifier - bridge rectifier - voltage doubler circuit - distortion factor - capacitor filter for low power rectifiers - LC filters - Concern for power quality - three phase diode bridge.

UNIT IV

CONTROLLED RECTIFIERS

SCR-Two transistor analogy based turn- ON turn ON losses thermal protection - controlled converters (1 pulse, 2 pulse, 3 pulse, 6 pulse) - displacement factor - ripple and harmonic factor - power factor mitigation, performance parameters - effect of source inductance - inverter angle limit.

UNIT V

AC PHASE CONTROLLERS

TRIAC triggering concept with positive and negative gate pulse triggering, TRIAC based phase controllers - various configurations for SCR based single and three phase controllers.

COURSE OUTCOMES:

Upon the successful completion of the course, students will be able to:

CO1: Understand the operation of semiconductor devices and dynamic characteristics and to design &analyze the low power SMPS

CO2: Analyze the various uncontrolled rectifiers and design suitable filter circuits

CO3: Analyze the operation of the n-pulse converters and evaluate the performance parameters

CO4: Understand various PWM techniques and apply voltage control and harmonic elimination methods to inverter circuits.

CO5: Understand the operation of AC voltage controllers and its applications.

TOTAL: 45 PERIODS

TEXT BOOKS:

1. Ned Mohan, T.M.Undeland, W.P.Robbins, "Power Electronics: Converters, applications and design", John Wiley and Sons, 3rd Edition (reprint), 2009

2. Rashid M.H., Power Electronics Circuits, Devices and Applications, Prentice Hall India, 3rd Edition, New Delhi, 2004.

REFERENCES:

1. Cyril. W. Lander, Power Electronics, McGraw Hill International, Third Edition, 1993.

2. P.S.Bimbhra, Power Electronics, Khanna Publishers, Third Edition 2003

3. Philip T.Krein, Elements of Power Electronics, Oxford University Press, 2013.

4. P.C.Sen, Power Electronics, Tata McGraw-Hill, 30th reprint, 2008.