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Fundamental of Power Electronics

Indian Institute of Technology Bombay via NPTEL

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The course introduces basics of power electronic devices and converters. Working principles, operating modes and analysis of DC-DC, DC-AC, AC-DC, and AC-AC converters would be covered for a variety of loads. Control of power electronic converters would be explained. Certain specialized concepts in power electronics like matrix converter, active rectifiers and SiC/GaN devices would be included, along with some of the popular applications of power electronics such as renewable energy conversion and power quality enhancement.

Undergraduate and post graduate, including research students, with electrical and electronics engg. background would benefit from the course. Those with background in energy science and engineering and system and control disciplines may also benefit. Industry professionals and researchers in R&D stream will also benefit.

PREREQUISITES: Electrical and electronic circuits, network theory and basics of semiconductor physics.


Week 1 : Power Electronics – Introduction (Definitions, Basic building blocks and applications); Introduction to switches and examples of PE; Power Converters-Classification (using switching matrix); PE Converter-Passive components (R, L, C) and Active components; Review of basic concepts-Engineering Math (Laplace, Fourier and Diff. equations) 
Week 2  :  Review of basic electrical engg. concepts-RLC circuits; Brief Semiconductor theory and PN Junction; Power Diodes; Thyristors (SCR); Thyristors (SCR and GTO). 
Week 3 :  Power BJT – Introduction, Structure, Operation, Characteristics; Power BJT–Equations, Losses, Drawbacks; Power MOSFET- Introduction, Structure, Operation and Characteristic; Power IGBT-Introduction, Structure, Operation and Characteristics; Power MOSFET and IGBT - comparison (Merits, Demerits, Applications)
Week 4 :  AC-DC Conv. 1-ɸ half-wave and full-wave, Uncontrolled and Controlled Rectifiers with R, R-L, R-L-E, R-E and pure L loads; Effect Of source Inductance (R-L and RLE loads only); 3-ɸ AC-DC Conv. Uncontrolled and Controlled Rectifiers (R and R-L loads only); Effect of source inductance on 3-ɸ rectifiers (R-L load only).
Week 5  :  AC-AC Conv. 1-ɸ AC voltage controllers; 3-ɸ AC voltage controllers; Cyclo-converters - 1-φ operation with R and R-L load; Cyclo-converters - Circulation mode operation, Waveforms and Equations, MATRIX Conv.; DC-DC Conv.-Introduction, Types of DC/DC converters, Drawbacks of Linear Power Supplies.
Week 6 : DC-DC Conv. Conventional (Thyristorized) dc-dc converters (choppers) and their 1, 2 and 4 quad. operation. Buck and Boost conv. (CCM/DCM); DC-DC Conv.-Buck-Boost Conv. (CCM/DCM), Cuk and SEPIC Conv.; Synchronous Buck Converter, Bidirectional and Full Bridge with 4 quadrant operation; DC-DC Isolated Conv.: Forward and flyback Conv.; DC-DC Isolated Conv.: Push-Pull Conv.
Week 7 : Resonant DC-DC converters. Intro and Basic Operation, ZVS and ZCS; DC-AC Conv. Intro: 1-ɸ half and full bridge inverter: Topology and working (Square wave and quasi wave operation); Fourier analysis of Square wave and quasi square wave operation. PWM operation: Merits and demerits of SPWM-(Bipolar, Unipolar); 3-ɸ VSI Topology and working, Square wave operation, 120 and 180; 3-ɸ VSI PWM operation (SPWM).
Week 8 : Space vector modulation (SVPWM), etc.; CSI-Topology and Basic Operation; Resonant Inverters: Basic Operation; Resonant Inverters: Design of LC, applications; Multi-level Inverters – Neutral Point Clamped Topology: Topologies and operation.
Week 9 : Drive Circuits: Need for drive circuits, examples, SCR drive; MOSFET and IGBT drives and their features, Selection of Gate Drive IC; Snubbers: Need for Snubbers, Types and examples; Snubber: Design Equations; Basics of magnetic Concepts.
Week 10: Inductor Design: eg. Area Product approach; Transformer Design: eg. Area Product approach; Inductor and Transformer (Examples and Applications); Thermal Modelling and Heat-Sink Design; Control of PE Systems, State Space (Averaging + Small Signal).
Week 11 : Control of PE Systems, State Space (Averaging + Small Signal analysis); Control Block Diagram, Controller design; Reference frame theory based control; Microgrid application.
Week 12: Power Quality issues and application of PE in resolving them STATCOM, Active filters etc.; Application of PE in Solar PV: Introduction, V-I Char., MPPT operation, grid-connected and standalone Solar PV systems; Application of PE in Wind: MPPT operation, grid-connected and standalone systems; Application of PE in Fuel cell energy conversion; Advanced Semiconductor Power devices eg. SiC, GaN devices.

Taught by

Prof. Vivek Agarwal

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