The course is intended mainly for doctoral students whose research topic is within or related to power electronics or electrical drives. The course provides a deep understanding of resonant converters, snubbers and gate-drive circuits. The course also highlights how resonant converters promote sustainability.
Content and learning outcomes
Operation and design of resonant converters, snubbers, and gate-drive circuits:
• Analysis of operation modes of different resonant converters
• Limitations in duty ratio, voltage and current for soft switching
• Methods of control for resonant converters
• Effects of non-idealities of resonant converters
• Energy loss minimization using resonant transitions and relation to sustainability
• Analysis of operation of different snubber circuits
• Electric stress and losses depending on parameter choices for snubbers
• Effects of parasitic elements of snubber circuits
• Good practices when designing gate-drive circuits
• Power device protection in gate-drive circuits
• Good practices for circuit layouts
Intended learning outcomes
After completion of the course the student shall be able to:
• explain how different resonant converters operate
• explain limitations of different resonant converters
• explain the basic operation of different snubber circuits
• explain how design choices of snubbers affect losses and electric stresses
• explain how different gate-drive circuits operate
• explain basic concepts of good circuit layouts
• calculate peak values of voltages and currents of different resonant converters
• calculate limits in duty ratios, min/max values of voltages/currents for soft-switching
• calculate values of passive components of snubbers
• calculate transient voltages and currents for power devices with snubbers
• calculate suitable values of impedances in gate loops
• describe characteristics of different resonant converters
• describe how parameter choices of resonant converters influence the operation
• describe how resonant converters can increase sustainability
• describe in what way parasitic elements of snubbers influence the effectiveness of the snubber
• describe how gate-drive circuits can withstand high levels of electromagnetic noise
• describe how power devices can be protected from the gate-drive circuit
Literature and preparations
Examination and completion
If the course is discontinued, students may request to be examined during the following two academic years.
- EXA1 - Exam, 8.0 credits, grading scale: P, F
Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.
The examiner may apply another examination format when re-examining individual students.
During the seminars the students should show that they are able to absorb the content of a section of the book and then present it in a professional way for the other students. The students should also show that they are capable of taking part in an advanced scientific discussion on the subject.
The project work is a simulation study which is presented in a report. In this report the students shall reflect over how their topic of investigation relates to sustainability. The written examination is a standard examination with the grades P or F.
Other requirements for final grade
• At least one approved seminar with oral presentation
• An approved simulation study on a subject chosen by the examiner
• An approved written examination
Opportunity to complete the requirements via supplementary examination
Opportunity to raise an approved grade via renewed examination
- All members of a group are responsible for the group's work.
- In any assessment, every student shall honestly disclose any help received and sources used.
- In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.
Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.Course web FEN3219
Main field of study
Mohan/Undeland/Robbins: Power Electronics: Converters, Applications, and Design, John Wiley & Sons,(0471-42908-2, 2003).