Events at Department of Energy Technology

Industrial/PhD Course: EMI/EMC in Power Electronics


16.11.2020 kl. 08.30 - 17.11.2020 kl. 16.30



Associate Prof. Pooya Davari, Aalborg University


Professor Eckart Hoene - Aalborg University and Fraunhofer IZM,
Dr. Christian Wolf, Lead Specialist, EMC & Power Electronics - Grundfos Holding A/S,
Associate Professor Pooya Davari - Aalborg University

ECTS: 2.5


With a rapid advancement of power switching devices and digital signal processing units, power electronics technology has found its way into many applications of renewable energy generation, transmission and consumption. Although power electronics systems are a key enabler as a cross-functional technology in the energy conversion process, their pulse energy conversion with inherent switching behavior exhibit disturbing harmonic emissions and electromagnetic noises.

Recently, with the high penetration of power electronic systems and advent of new power semiconductor devices known as wide-band gap (WBG) the importance of understanding and preventing power converters switching disturbances have significantly elevated. The generated harmonic and noise disturbances can result in electromagnetic interference (EMI) and should be controlled within specific limits by applying proper filtering, topology and control scheme. Thereby, in order to prevent the power converters from disturbing their own operation and other nearby electronic devices they should design for electromagnetic compatibility (EMC).

The emphasis of this course is to give a complete and clear picture on EMI issues and mitigation methodologies. Systematic designing of passive EMI filters for differential mode (DM) and common mode (CM) noises in single-phase and three-phase systems will be provided. Printed circuit board (PCB) design criteria, passive and active components parasitic and shielding approaches in reducing near-field couplings will be covered as well. Furthermore, time and frequency domain modeling of conducted low and high frequency emission noises through developing equivalent circuit models of power electronics converters in order to reduce the analysis complexity and prevent from conventional trial and error design approach will be addressed. This course will also focus on new challenges within the new frequency band of 2-150 kHz (i.e., suparharmonics) in power electronic based power systems. The course content is combined with real-world application examples and demonstration.

In the first day the course will focus on basics of harmonics generated by switching, EMI issues in PWM converters, components parasitic, measurement requirement, interference mechanisms, filtering component and strategy. In the second day there will be more focus on advanced topics such as magnetic coupling, EMI prediction, Shielding and new standard requirements. The second day will be supported with industrial examples and real-world design experience regarding different aspects of EMI/EMC in power electronics. 


This course is intended for intermediate and advanced researchers and engineers in the field of power electronics and its applications, for EMC specialists and advanced university students exploring new harmonics and EMI challenges in power electronics-based power system and WBG-based power electronic systems. General knowledge in power electronics converters operation modes, passive components and basic control theory are preferred. Course exercises and mini-projects will be performed on MATLAB/PLECS software platform.

  1. Pre-reading the shared materials
  2. Power Electronics
  3. Basic understanding of power electronics control

Form of evaluation

The participants will work on mini-projects in the final 1-day lecture. The mini-projects are defined based on a real application design and will be assigned to group of four people. Groups will compare and deeply discuss their design method and choices and present their results in presentation form to the class.

  1. Mini-projects
  2. Power point presentation

Day1: 8:30 – 16:30

08:30 – 09:00 Introduction and Welcome [Pooya]
09:00 – 09:45 Topic1: Basics: Harmonics Generated by Switching [Pooya]

(Why EMI issues in PWM converters?)

09:45 – 10:00 Break
10:00 – 10:45 Topic2: Basics: Components Parasitic [Pooya]

(Passive and active components non-ideal characteristics)

11:00 – 12:00 Topic3: Basics: Measurement requirement [Pooya]

(How to conduct measurement, the role of LISN/AMN and EMI receiver)

12:00 – 13:00 Lunch
13:00-13:45 Topic4: Interference Mechanisms [Eckart/Pooya]

(Understanding DM and CM interferences)

13.45-14:30 Topic5: Filtering Components and Strategy [Eckart/Pooya]

(DM and CM filter design criteria and tricks)

14:30 – 14:45 Break
14:45 – 15:15 Topic6: Filtering Components (Advanced) [Eckart]

(Near field coupling and suitable filter orientation)

15:15 – 16:00 Topic7: Prediction [Eckart/Pooya]

(How to simulate? Which software to choose?)

16:00 – 16:30 Topic8: Practical examples [Eckart]

(Simulating EMI vs Experimental)

Day2: 8:30 – 16:30

08:30 – 09:00 Topic9: Mechanisms [Eckart]

(Shielding electric and magnetic fields)

09:00 – 09:45 Topic10: Design Strategies for Power Electronic Devices [Eckart]

(How to go from Si to WBG)

09:45 – 10:00 Break
10:00 – 10:45 45 min presentation from groups (mini projects) [Students]

(each group has 5min to present and 5min to get feedback)

10:45-11:15 Topic11: New 2- 150 kHz Frequency Range Standard [Pooya]

(Requirements and challenges)

11:15-12:00 Topic12: Overview: for interference, propagation, remedies and limits [Eckart]
12:00 – 13:00 Lunch
13:00-13:30 Topic13: EMC Demonstrator Conducted Mode [Christian]

(How the enclosure and mechanical layout can affect the performance of your filter)

13:30-13:45 Topic14: EMC Demonstrator Radiated Mode [Christian]

(How the enclosure and mechanical layout can affect the performance of your filter)

13:45-14:00 Topic15: Resonance Phenomenon [Christian]

(Resonance phenomenon in conducted emission measurement)

14:00-14:30 Topic16: EMC filters and mechanical layout [Christian]

(What is important in filter layout)

14:30 – 14:45 Break
14:45-15:30 Topic17: Crosstalk – Ground plane [Christian]

(Minimize noise problems in PCB layout, both emission and immunity)

15:30-16:00 Topic18: SMPS and layout [Christian]

(Minimize noise problems in breadboard test set-up, both emission and immunity)

16:00 – 16:30 Feedback



6000 DKK for PhD students outside of Denmark and 8000 DKK for the Industry.


Department of Energy Technology


Aalborg University, Pontoppidanstræde 101, room 1.015, 9220 Aalborg East