Line Commutated and PWM Rectifiers

By Prof. Anandarup Das | IIT Delhi

Learners enrolled: 520 | Exam registration: 50

ABOUT THE COURSE:

The course covers different types of AC-DC converters. The technology of diode and thyristor based rectifiers is quite matured. However, they are slowly getting replaced by PWM converters for newer applications like EV and battery charging with improvement in size and efficiency of the converter. Thus, it is important to study and understand this subject keeping in mind the direction of future development.

Both the traditional line commutated rectifiers and the newer generation converters like PFC boost, AC-DC flyback or bridgeless PFC will be covered, with an emphasis for the latter. In addition, modeling and controller design for traditional three phase converter (AC-DC or DC-AC) will be taken up. Lectures will be supported by practical examples and followed by assignments for thorough understanding.

All the lectures will be delivered keeping in mind about the need for both UG and PG students. During the initial portion of a specific topic, the basics will be covered which is suitable for both types of students. Further, advanced topics will be introduced.

INTENDED AUDIENCE: Students and professionals

PREREQUISITES: A first course (UG level) on power electronics is a pre-requisite.

INDUSTRY SUPPORT: Industries that deal with power converters for grid integration like ABB, Siemens, ST Microelectronics etc.

Summary

Course Status :	Completed
Course Type :	Elective
Language for course content :	English
Duration :	12 weeks
Category :	Electrical, Electronics and Communications Engineering Power Systems and Power Electronics
Credit Points :	3
Level :	Undergraduate/Postgraduate
Start Date :	21 Jul 2025
End Date :	10 Oct 2025
Enrollment Ends :	04 Aug 2025
Exam Registration Ends :	22 Aug 2025
Exam Date :	01 Nov 2025 IST
NCrF Level	4.5 — 8.0

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1: Diode and thyristor based rectifiers (single phase and 3-phase) with RL and RC loads, Use of L, C and LC filters, effect of source inductance, continuous and discontinuous conduction.

Week 2: Multi-pulse rectifiers to improve power quality: 6-pulse, 12-pulse or higher pulse rectifiers, transformer configuration, input current analysis, THD and power quality issues.

Week 3: Three phase AC-DC converter (Inverter/ PWM rectifier): steady state analysis, phasor diagram, leading, lagging and unity power factor operation, regenerative mode, Hysteresis control.

Week 4: Three phase grid connected AC-DC converter: space vector, Clarke and Park transformation.

Week 5: Three phase grid connected AC-DC converter: d-q Modeling, small signal analysis.

Week 6: Three phase grid connected AC-DC converter: designing of controller, design example.

Week 7: Single phase AC-DC converter (PFC Boost rectifier): power circuit, steady state analysis, unity power factor operation

Week 8: AC-DC Flyback converter: Basic understanding of DC-DC Flyback converter, power circuit of AC-DC Flyback converter, steady state analysis

Week 9: Bridgeless PFC circuits: circuit topologies, steady state analysis.

Week 10: Three level NPC rectifier, Vienna rectifier: circuit topology, steady state analysis.

Week 11: AC-DC converters for EV chargers- onboard and offboard chargers: topologies, analysis and operational issues, commercial development, future trends.

Week 12: Introduction to converters for battery storage system, conclusion

Books and references

Lecture slides, datasheets and application notes.

Fundamentals of Power Electronics, by Robert W. Erickson and Dragan Maksimovic, Springer publication.
Power Electronics: Converters Applications and Design by Mohan, Undeland and Robbins, Wiley Publication
Power Electronic Circuit by Issa Batraseh, Wiley Publication
Power Electronics: Essentials and Applications by L Umanand, Wiley Publication
Modern Power Electronics and AC Drives, by B.K. Bose, Prentice Hall India Learning Private Limited

Instructor bio

Prof. Anandarup Das

IIT Delhi

Dr. Anandarup Das works as an Associate Professor in the Department of Electrical Engineering, IIT Delhi. He works in high power electronics and motor drives for various applications in electrical industries. His research interest includes power converter topologies, PWM techniques and control.

He has published 43 journal papers, 61 conference papers and 10 patents. Dr. Anandarup Das has completed guiding 1 Post Doc, 5 PhD research scholars, 14 MTech and several BTech students. Currently, 8 PhD scholars and 1 MsR student are working with him.

Dr Anandarup Das has several international projects with Norway, UK, Denmark etc. with support from DST and SERB and national collaborative projects with CPRI, CSIR Durgapur, NHSRCL etc. in India.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.

The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).

Date and Time of Exams: November 01, 2025 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.

Registration url: Announcements will be made when the registration form is open for registrations.

The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.

Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

Please note that assignments encompass all types (including quizzes, programming tasks, and essay submissions) available in the specific week.

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Madras. It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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