525.725.81 - Power Electronics

Expanded Course Description

Prerequisites

Course Structure

The course materials are divided into modules which can be accessed by clicking Course Modules on the left menu. A module will have several sections including the overview, content, readings, discussions, weekly quizzes and assignments. You are encouraged to preview all sections of the module before starting. Most modules run for a period of seven (7) days, exceptions are noted in the Course Outline. You should regularly check the Calendar and Announcements for assignment due dates.

Course Topics

• Introduction to Steady- State Analysis of a Switching Converter
• Introduction to Simulink – Simulating a BOOST converter
• Switch Realization, Losses, and Efficiency of a Switching Converter
• Discontinuous Conduction Mode (DCM)
• Transformer Isolation
• Large Signal Modeling
• Small Signal Modeling
• Converter Transfer Functions
• Control and Regulator Design
• Conducted EMI and Filter Design
• Power Analysis/Diode Rectifiers
• DCM Flyback/LFR Rectifier
• Control of DCM Flyback and Energy Storage Consideration

Course Goals

The objective of this course is to provide the student with analytical modeling, analysis and control techniques to design switching regulators to meet specific design performance requirements.

Course Learning Outcomes (CLOs)

• Perform steady state analysis on power electronic circuits in both continuous and discontinuous conduction modes.
• Select power electronic components based on results from steady state analysis.
• Calculate converter losses to determine overall converter efficiency.
• Derive large and small signal models of power electronic circuits.
• Analyze converter transfer functions using MATLAB Simulink.
• Design control regulators using MATLAB Simulink to meet typical performance requirements.
• Design input filters to meet conducted emission EMI requirements.
• Simulate three types of power electronic models using MATLAB Simulink (switching, large signal, small signal).
• Control a converter to perform active power factor correction.

Textbooks

Erickson, R.W. & Maksimović, D. (2004). Fundamentals of power electronics Second Edition. New York, NY: Kluwer Academic Publishers.

ISBN: 978-1-4757-0559-1

A pdf version of the text book has been included under course information. Textbook information for this course is available online through the appropriate bookstore website: For online courses, search the BNC website at http://ep.jhu.edu/bookstore.

Required Software

MATLAB

You will need access to MATLAB/Simulink version 2017b or newer with the Power Systems library add on under Simscape. The MATLAB Total Academic Headcount (TAH) license is now in effect. This license is provided at no cost to you. Send an email to software@jhu.edu to request your license file/code. Please indicate that you need a standalone file/code. You will need to provide your first and last name, as well as your Hopkins email address. You will receive an email from Mathworks with instructions to create a Mathworks account. The MATLAB software will be available for download from the Mathworks site.

Technical Requirements

• Circuit Analysis techniques (KVL,KCL, Laplace domain)
• Operation of Semiconductor devices (Diode, MOSFET,IGBT)
• Transfer functions and frequency analysis (BODE plots, step response)
• MATLAB (vector and matrix math, mfile creation)
  

Student Coursework Requirements

It is expected that each module will take approximately 7–10 hours per week to complete. Here is an approximate breakdown: reading the suggested sections of the texts (approximately 1–2 hours per week), listening to the audio annotated slide presentations and responding to the discussion forum (approximately 2–3 hours per week), and learning assessments (approximately 4–5 hours per week).

This course will consist of the following basic student requirements:

Weekly Discussion Forum

A discussion forum is created for each module. Please use the module discussion forum for any questions related to a particular module so responses and clarifications are available to all students.

Only contact me directly via email when the discussion forum is not appropriate.

Weekly Module Quiz (15% of Final Grade Calculation)

Assignments (30% of Final Grade Calculation)

Assignments are due weekly at the start of a new module (Wednesday) according to the dates in the Calendar. For example module 1 assignment will be due by midnight EST the day module 2 is posted.

The assignments are online based and contain problem sets and SIMULINK exercises. Partial credit will be awarded for SIMULINK problem sets. Problems involving SIMULINK will require uploading simulation results in the form of a picture. Discussions and collaborations are encouraged with fellow students for the assignments only, but final answers to problem sets must be derived on your own. Sharing final answers or using previous semester answers is a direct violation of the academic conduct policy.

Partial Credit:
Partial credit links will be open for each assignment after the due date. Solution sets to a previous module will be posted at the start of a new module. Students have 48 hours to review solution sets and generate a word based document (handwritten submissions not accepted) explaining what aspect of a particular problem should be considered for partial credit and why. The document should provide a detailed explanation of where in the problem a mistake was made. A math mistake that cascades to other problems needs to be documented. The partial credit awarded will be based on how well the document details and outlines the mistakes and is very subjective.

Unless extenuating circumstances such as personal/family emergency, NO Late submissions will be accepted.

Weekly assignments are graded out of ten points:

Midterm Exam (25% of Final Grade Calculation)

The midterm exam will be available in Module 7 covering modules 1-6.

No late submissions will be accepted.

Work on this midterm must be entirely your own. No discussion with fellow classmates or anyone outside this class is allowed. You can submit questions to Dr. Reichl for clarification.

Final Project (30% of Final Grade Calculation: design calculations 15% simulation files 15%)

The final project will be available in Module 12

No late submissions will be accepted.

The project will involve design calculations submitted much like the assignments.

Work on this project must be entirely your own. No discussion with fellow classmates or anyone outside this class is allowed. You can submit questions to Dr. Reichl for clarification.

Grading Policy

Assignments are due according to the dates posted in your Canvas course site. You may check these due dates in the Course Calendar or the Assignments in the corresponding modules. I will post grades one week after assignment due dates.

A grade of A indicates achievement of consistent excellence and distinction throughout the course—that is, conspicuous excellence in all aspects of assignments and discussion in every week.

A grade of B indicates work that meets all course requirements on a level appropriate for graduate academic work. These criteria apply to both undergraduates and graduate students taking the course.

EP uses a +/- grading system (see “Grading System”, Graduate Programs catalog, p. 10). You should contact your Program Chair for guidance on the breakdown used by your program.

Example:
100–98 = A+

97–94 = A

93–90 = A−

89–87 = B+

86–83 = B

82–80 = B−

79–70 = C

Final grades will be determined by the following weighting:

Academic Policies

Deadlines for Adding, Dropping and Withdrawing from Courses

Students may add a course up to one week after the start of the term for that particular course. Students may drop courses according to the drop deadlines outlined in the EP academic calendar (https://ep.jhu.edu/student-services/academic-calendar/). Between the 6th week of the class and prior to the final withdrawal deadline, a student may withdraw from a course with a W on their academic record. A record of the course will remain on the academic record with a W appearing in the grade column to indicate that the student registered and withdrew from the course.

Academic Misconduct Policy

All students are required to read, know, and comply with the Johns Hopkins University Krieger School of Arts and Sciences (KSAS) / Whiting School of Engineering (WSE) Procedures for Handling Allegations of Misconduct by Full-Time and Part-Time Graduate Students.

This policy prohibits academic misconduct, including but not limited to the following: cheating or facilitating cheating; plagiarism; reuse of assignments; unauthorized collaboration; alteration of graded assignments; and unfair competition. Course materials (old assignments, texts, or examinations, etc.) should not be shared unless authorized by the course instructor. Any questions related to this policy should be directed to EP’s academic integrity officer at ep-academic-integrity@jhu.edu.

Students with Disabilities - Accommodations and Accessibility

Johns Hopkins University values diversity and inclusion. We are committed to providing welcoming, equitable, and accessible educational experiences for all students. Students with disabilities (including those with psychological conditions, medical conditions and temporary disabilities) can request accommodations for this course by providing an Accommodation Letter issued by Student Disability Services (SDS). Please request accommodations for this course as early as possible to provide time for effective communication and arrangements.

For further information or to start the process of requesting accommodations, please contact Student Disability Services at Engineering for Professionals, ep-disability-svcs@jhu.edu.

Student Conduct Code

The fundamental purpose of the JHU regulation of student conduct is to promote and to protect the health, safety, welfare, property, and rights of all members of the University community as well as to promote the orderly operation of the University and to safeguard its property and facilities. As members of the University community, students accept certain responsibilities which support the educational mission and create an environment in which all students are afforded the same opportunity to succeed academically. 

For a full description of the code please visit the following website: https://studentaffairs.jhu.edu/policies-guidelines/student-code/

Classroom Climate

JHU is committed to creating a classroom environment that values the diversity of experiences and perspectives that all students bring. Everyone has the right to be treated with dignity and respect. Fostering an inclusive climate is important. Research and experience show that students who interact with peers who are different from themselves learn new things and experience tangible educational outcomes. At no time in this learning process should someone be singled out or treated unequally on the basis of any seen or unseen part of their identity. 
 
If you have concerns in this course about harassment, discrimination, or any unequal treatment, or if you seek accommodations or resources, please reach out to the course instructor directly. Reporting will never impact your course grade. You may also share concerns with your program chair, the Assistant Dean for Diversity and Inclusion, or the Office of Institutional Equity. In handling reports, people will protect your privacy as much as possible, but faculty and staff are required to officially report information for some cases (e.g. sexual harassment).

Course Auditing

When a student enrolls in an EP course with “audit” status, the student must reach an understanding with the instructor as to what is required to earn the “audit.” If the student does not meet those expectations, the instructor must notify the EP Registration Team [EP-Registration@exchange.johnshopkins.edu] in order for the student to be retroactively dropped or withdrawn from the course (depending on when the "audit" was requested and in accordance with EP registration deadlines). All lecture content will remain accessible to auditing students, but access to all other course material is left to the discretion of the instructor.