JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Electronics

Course Objectives:

• To understand various Power Electronics devices such as SCR, TRIAC, DIAC, IGBT, GTO etc.
• To understand application of aforesaid Power Electronics devices in Choppers, Inverters and Converters etc.
• To understand control of Electrical Motors through DC-DC converters, AC Converters etc.
• To understand the use of Inductors and Capacitors in Choppers, Inverters and Converters. Course outcomes: Students are able to
• To understand various Power Electronics devices such as SCR, TRIAC, DIAC, IGBT, GTO etc.
• To understand application of aforesaid Power Electronics devices in Choppers, Inverters and Converters etc.
• To understand control of Electrical Motors through DC-DC converters, AC Converters etc.
• To understand the use of Inductors and Capacitors in Choppers, Inverters and Converters.

UNIT - I

High-Power Semiconductor Devices: Introduction, High-Power Switching Devices, Diodes, Silicon-Controlled Rectifier (SCR), Gate Turn-Off (GTO) Thyristor, Gate-Commutated Thyristor (GCT), Insulated Gate Bipolar Transistor (IGBT), Other Switching Devices, Operation of Series-Connected Devices, Main Causes of Voltage Unbalance, Voltage Equalization for GCTs,

UNIT - II

Cascaded H-Bridge Multilevel Inverters: Introduction, Sinusoidal PWM, Modulation Scheme, Harmonic Content, Over modulation, Third Harmonic Injection PWM, Space Vector Modulation, Switching States, Space Vectors, Dwell Time Calculation, Modulation Index, Switching Sequence, Spectrum Analysis, Even-Order Harmonic Elimination, Discontinuous Space Vector Modulation. Introduction, H-Bridge Inverter, Bipolar Pulse-Width Modulation, Unipolar Pulse-Width Modulation.

R16 B.TECH EEE.

UNIT - III

Diode-Clamped Multilevel Inverters: Three-Level Inverter, Converter Configuration, Switching State ,Commutation, Space Vector Modulation, Stationary Space Vectors , Dwell Time Calculation, Relationship Between V_refLocation and Dwell Times, Switching Sequence Design, Inverter Output Waveforms and Harmonic Content , Even-Order Harmonic Elimination, Neutral-Point Voltage Control, Causes of Neutral-Point Voltage Deviation , Effect of Motoring and Regenerative Operation, Feedback Control of Neutral-Point Voltage

UNIT - IV

DC-DC Switch-Mode Converters & Switching DC Power Supplies Control of dc-dc converter, Buck converter, boost converter, buck-boost converter, cuk dc-dc converter, full- bridge dc-dc converter, dc-dc converter comparison. Introduction, linear power supplies, overview of switching power supplies, dc-dc converters with electrical isolation, control of switch mode dc power supplies, power supply protection, and electrical isolation in the feedback loop, designing to meet the power supply specifications.

UNIT - V

Resonant Converters & Power Conditioners And Uninterruptible Power Supplies Classification of resonant converters, basic resonant circuit concepts, load-resonant converters, resonant-switch converters, zero-voltage-switching, resonant-dc-link inverters with zero-voltage switching’s, high frequency-link integral-half cycle converters. Power line disturbances, Introduction to Power Quality, power Conditioners, uninterruptible power supplies, Applications.

TEXT BOOKS:

• 1. “M. H. Rashid”, Power electronics circuits, Devices and applications, PHI, I edition – 1995.
• 2. “Ned Mohan, Tore M. Undeland and William P. Robbins, A”, “Power Electronics converters, Applications and Design” John Wiley & Sons, Inc., Publication, 3rd Edition 2003

REFERENCE BOOK:

• 1. “Bin Wu, A”, “High-Power Converters and Ac Drives” John Wiley & Sons, Inc., Publication (Free down load from rapidshire.com) 2006. R16 B.TECH EEE.