3rd course in the Modeling and Control of Power Electronics

Instructor: Dragan Maksimovic, Ph.D., Professor 

Prior knowledge needed: ECEA 5700 Introduction to Power Electronics, ECEA 5701 Converter Circuits, ECEA 5702 Converter Control, ECEA 5703 Magnetics Design, ECEA 5705 Averaged Switch Modeling and Simulation, ECEA 5706 Technical Design-Oriented Analysis 

Learning Outcomes

  • Gain an understanding of issues related to electromagnetic interference (EMI) and electromagnetic compatibility (EMC).
  • Understand the need for input filters and the effects input filters may have on converter responses.
  • Design properly damped single and multi-section filters to meet the conducted EMI attenuation requirements without compromising frequency responses or stability of closed-loop controlled power converters.

Syllabus

Duration: 5 hours

In this module, EMI and EMC issues are introduced, and differences between differential-mode and common-mode noise are highlighted. It is shown how conducted common-mode EMI is related to parasitic capacitive couplings between high dv/dt nodes and chassis ground, whereas conducted differential-mode EMI is related to converter input current ripple. The purpose of a line impedance stabilization network (LISN) in an EMC measurement setup is explained and illustrated by a simulation example. We discuss how input filters are required to attenuate conducted interference on the input side of the converter, We also show how undamped input filters may affect converter frequency responses and lead to performance degradation or instability of closed-loop regulated power converters. Week 1 includes application examples and practice Quizzes and concludes with a graded Quiz on Introduction to Input Filter Design.

Duration: 4 hours

In this module, the impact of an input filter on converter frequency responses is studied using the Extra Element Theorem, which is a design-oriented analysis technique covered in Techniques of Design Oriented Analysis. Input filter design criteria are established based on attenuation requirements and the need to meet impedance conditions necessary to mitigate effects on the converter frequency responses. Damping of input filters is discussed in detail, including optimal damping techniques to minimize the size of filter components. Examples are included to illustrate the design of damped single-section input filters. Week 2 includes practice Quizzes and concludes with a graded Quiz on the Single-Stage Input Filter Design.

Duration: 4 hours

In this module, we discuss an approach to the design of properly damped multi-section input filters, which offer higher-order attenuation and reduced size of filter components. Design examples are included to illustrate the design of damped multiple-section input filters. Week 3 includes application examples and practice Quizzes, as well as a graded Quiz on the Multi-Stage Input Filter Design.

Duration: 2 hours

Final Exam for this course.

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Grading

Assignment
Percentage of Grade
Segment 1 Quiz: Introduction to Input Filter Design 15%
Segment 2 Quiz: Single Stage Input Filter Design 15%
Segment 3 Quiz: Multi Stage Input Filter Design 15%
Practice Exam 10%

ECEA 5707 Input Filter Design Final Exam

45%

Letter Grade Rubric

Letter Grade 
Minimum Percentage

A

92%

A-

90%

B+

88%

B

82%

B-

80%

C+

78%

C

72%

C-

70%

D+

68%

D

56%

F

0%