Power Electronics is the enabling technology for achieving various power conversion by using semiconductor devices as a "power switch." This course describes fundamentals, operating principles, and applications of each power converter topology comprehensively, in which the particular attention is paid to the following items: 1) fundamentals of power electronics, 2) operation principles of power converters as a voltage source or current source, 3) roles of passive components (i.e., transformers, capacitors, and inductors), 4) the characteristics of power semiconductor devices, 5) dc choppers (i.e., buck choppers, boost choppers, and buck-boost choppers), 6) isolated dc-dc converters, 7) diode rectifiers with a pure resistive load, 8) diode rectifiers with a dc inductor, 9) diode rectifiers with a dc capacitor, 10) the fundamentals and operating principles of inverters, 11) single-phase inverters, 12) three-phase inverters, 13) current-source inverters, 14) NPC (Neutral-Point-Clamped) inverters, 15) the applications of power electronics.
The importance of power electronics increases year by year because it is an enabling technology for solving environmental problems such as global warming as well as achieving energy saving. In addition, it is possible to understand other important courses such as electric machinery, linear circuit theory, and control engineering for electrical and electronic engineers more deeply because power electronics is based on these courses. We hope that each of the students attends this course actively for understanding the importance of power electronics more.
By the end of this course, students will be able to:
1) Compare advantages and disadvantages of each of the power devices (i.e., diode, thyrister, IGBT, MOSFET, and so on) as a power switch.
2) Use passive components (i.e., transformer, inductor, and capacitor) to form voltage or current source by understanding the roles and importance of them in power electronics.
3) Calculate voltage ratio, ripple-voltage amplitude, ripple-current amplitude by understanding the operating principles and characteristics of each dc-dc converter.
4) Calculate dc voltage of various diode rectifiers by understanding the roles of diodes and passive components.
5) Compare advantages and disadvantages of modulation methods and harmonic spectra by understanding the operating principles of various inverter topologies.
Power electronics, power semiconductor devices, dc choppers, isolated dc-to-dc converters, diode rectifiers, inverters.
|Specialist skills||Intercultural skills||Communication skills||✔ Critical thinking skills||Practical and/or problem-solving skills|
|✔ ・Applied specialist skills on EEE|
Each lecture will be given primarily by using MS PowerPoint slides, the contents of which are based on the designated textbook. All slides will be uploaded to OCWi before or after the lecture.
|Course schedule||Required learning|
|Class 1||Fundamentals of power electronics - Fundamental of power converters, semiconductor switches, the roles of passive components, supply and load, voltage source and current source, various forms of power conversion.||Understand the fundamentals of power converters and the relationship between supply and load and operation of voltage and current sources by reading power point slides and pages 1–14 of textbook carefully.|
|Class 2||Power semiconductor devices 1 - Physical properties of silicon, pn junction and diode, transient characteristics of diode, and snubber circuits.||Understand the fundamental characteristics of diodes and protection of power devices by reading power point slides and pages 16–27 of textbook carefully.|
|Class 3||Power semiconductor devices 2 - Power transistors, thyristors, GTO and GCT thyristors.||Understand the fundamental characteristics of power transistors, thyristors, and MOSFETs by reading power point slides and pages 27–41 of textbook carefully.|
|Class 4||Power semiconductor devices 2 - MOSFETs, IGBTs, PM and IPM, gate drive circuits, next-generation power devices (SiC devices and GaN devices).||Understand the fundamental characteristics of MOSFETs, IGBTs, and next-generation power devices by reading power point slides and pages 38–54 of textbook carefully.|
|Class 5||DC-DC conversion 1 - Outline of dc-dc conversion, operating principles of buck chopper and boost chopper.||Understand the operating principles of dc-dc converters by reading power point slides and pages 66–70 of textbook carefully.|
|Class 6||DC-DC conversion 2 - Operating principles of bi-directional chopper, buck-boost chopper, and four-quadrant chopper.||Understand the operating principles of buck, boost, and buck-boost choppers by reading power point slides and pages 70–71 and 88-99 of textbook carefully.|
|Class 7||Test level of understanding with exercise problems and summary of the first part of the course - Solve exercise problems covering the contents of classes 1–6.||Test level of understanding and self-evaluate achievement for classes 1–6.|
|Class 8||DC-DC conversion 3 - Operating principles of isolated dc-dc converters (flyback converter and forward converter).||Understand the operating principles of isolated dc-dc converters by reading power point slides and pages 100–107 of textbook carefully.|
|Class 9||AC-DC conversion (rectifier) 1 - Outline of ac-dc conversion, rectifiers with pure resistive load, role of inductor.||Understand the operating principles of rectifiers with pure resistive load and the role of inductor by reading power point slides and pages 177–184 of textbook carefully.|
|Class 10||AC-DC conversion (rectifier) 2 - Role of free-wheeling diode, dc magnetic flux deviation, overlapping of currents.||Understand the role of free-wheeling diodes in rectifiers and the overlapping of currents by reading power point slides and pages 185–192 of textbook carefully.|
|Class 11||AC-DC conversion (rectifier) 3 - Rectifier with dc capacitors, 12-pulse rectifier, thyristor rectifiers, PWM rectifiers, and PFC rectifiers.||Understand the operating principles of various rectifiers by reading power point slides and pages 192–218 of textbook carefully.|
|Class 12||DC-AC conversion (inverter) 1 - Outline of inverters, classification of inverters, single-phase full-bridge inverter.||Understand the operating principles of inverters by reading power point slides and pages 115–122 of textbook carefully.|
|Class 13||DC-AC conversion (inverter) 2 - Pulse-Width-Modulation (PWM), single-phase or three-phase PWM inverter, NPC (Neutral-Point-Clamped) inverter.||Understand the operating principles of PWM by reading power point slides and pages 165–168 of textbook carefully.|
|Class 14||DC-AC conversion (inverter) 3 - Current control of three-phase PWM converter, high-voltage high-power power electronics, modular multilevel cascade converters.||Understand the operating principles of a three-phase PWM converter and state-of-the-art high-voltage high-power power electronics.|
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
Kin, Tokai. Power Switching Technology: IEEJ; ISBN 978-4-88686-296-9 C3054. (Japanese)
Students' knowledge of fundamentals of power electronics, power semiconductor devices, dc-dc converters, rectifiers, inverters, and their ability to apply them to problems will be assessed by reports (100%).
Electric Circuit Theory I and II, Electric Machinery, Control Engineering for Electrical and Electronic Engineers.