JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Analog Electronics, Digital Electronics

Course Objectives:

• To Design/develop suitable power converter for efficient control or conversion of power in drive applications
• To Design / develop suitable power converter for efficient transmission and utilization of power in power system applications.

Course Outcomes

At the end of this course students will demonstrate the ability to

• Understand the differences between signal level and power level devices.
• Analyze controlled rectifier circuits.
• Analyze the operation of DC-DC choppers.
• Analyze the operation of voltage source inverters.

UNIT - I

POWER SWITCHING DEVICES Concept of power electronics, scope and applications, types of power converters; Power semiconductor switches and their V-I characteristics - Power Diodes, Power BJT, SCR, Power MOSFET, Power IGBT; Thyristor ratings and protection, methods of SCR commutation, UJT as a trigger source, gate drive circuits for BJT and MOSFETs

UNIT - II

AC-DC CONVERTERS (PHASE CONTROLLED RECTIFIERS) Principles of single-phase fully-controlled converter with R, RL, and RLE load, Principles of single-phase half-controlled converter with RL and RLE load, Principles of three-phase fully-controlled converter operation with RLE load, Effect of load and source inductances, General idea of gating circuits, Single phase and Three phase dual converters

UNIT - III

DC-DC CONVERTERS (CHOPPER/SMPS) Introduction, elementary chopper with an active switch and diode, concepts of duty ratio, average inductor voltage, average capacitor current. Buck converter - Power circuit, analysis and waveforms at steady state, duty ratio control of output voltage. Boost converter - Power circuit, analysis and waveforms at steady state, relation between duty ratio and average output voltage. Buck-Boost converter - Power circuit, analysis and waveforms at steady state, relation between duty ratio and average output voltage.

UNIT - IV

AC-DC CONVERTERS (INVERTERS) Introduction, principle of operation, performance parameters, single phase bridge inverters with R, RL loads, 3-phase bridge inverters - 120 and 180 degrees mode of operation, Voltage control of single phase inverters –single pulse width modulation, multiple pulse width modulation, sinusoidal pulse width modulation.

UNIT - V

AC-AC CONVERTERS Phase Controller (AC Voltage Regulator)-Introduction, principle of operation of single phase voltage controllers for R, R-L loads and its applications. Cyclo-converter-Principle of operation of single phase

R18 B.TECH EEE III YEAR

cyclo-converters, relevant waveforms, circulating current mode of operation, Advantages and disadvantages.

TEXT BOOKS:

• 1. M. H. Rashid, “Power electronics: circuits, devices, and applications”, Pearson Education India, 2009.
• 2. N. Mohan and T. M. Undeland, “Power Electronics: Converters, Applications and Design”, John Wiley & Sons, 2007.

REFERENCES:

• 1. R. W. Erickson and D. Maksimovic, “Fundamentals of Power Electronics”, Springer Science & Business Media, 2007.
• 2. L. Umanand, “Power Electronics: Essentials and Applications”, Wiley India, 2009. R18 B.TECH EEE III YEAR