Resonant and Soft-Switching Techniques in Power Electronics

ECEN 5817 Spring 2012

Announcements

  • (05/22) Final exam solutions have been posted on D2L (for thos who have submitted their work via D2L)
  • (05/07) Final exam, problem 1 correction: the phase shift phi is in the range -pi < phi < pi. Corrected version of the final exam has been posted on D2L.
  • (05/06) Another correction in lecture 43: there was an error in Pzvt(J) calculation in the ZVT analysis and design example. A corrected set of annotated slides has been posted on the schedule page. The sample final exam solutions file on D2L has been updated. Also note that in the sample exam solutions, in the expression for Ic,rms, a factor of (1/3) was incorrectly dropped in the D_23*u_23 term. This correction has not been made in the sample-exam solutions.
  • (05/03) Correction in lecture 43, design example, page 2: M = V/(nVg), because the transformer is 1:n, not n:1. A corrected set of annotated slides has been posted on the schedule page.
  • (04/25) Final exam will be handed out for on-campus students in class on Friday, May 4. This exam will be due by 2pm on Wednesday May 9. Off-campus students can start working on the exam any time on or after Friday May 4. The exam is due 5 days after the start, but no later than 5pm MT on Wednesday, May 16. For practice, a sample exam and solutions have been posted on D2L in the Content section.
  • (04/23) Homework 11 is due in class on Monday, April 30. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, May 7.
  • (04/16) Homework 10 is due in class on Monday, April 23. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, April 30.
  • (04/09) Homework 9 is due in class on Monday, April 16. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Friday, April 23.
  • (04/02) Homework 8 is due in class on Monday, April 9. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, April 16.
  • (03/14) For on-campus students midterm exam is handed out in class on Wed 3/14. It is due in class on Wed 3/21. Off-campus students can start the exam after 11am MT on Wed 3/14. The exam is due in one week after the start time, but no work will be accepted after 5pm MT on Wed 3/28. Off-campus students should use D2L system to obtain the exam and to upload the work.
  • (03/05) Homework 7 is due in class on Monday, March 12. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Friday, March 19.
  • (02/24) Homework 6 is due in class on Monday, March 5. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Friday, March 12.
  • (02/22) Lectures 17 and 18 will be recorded in class on Friday, Feb.24, 10am-12pm. Lectures 19 and 20 will be recorded in class on Friday, March 2, 10am-12pm. I will be away on a trip M-W, Feb 27-29. There will be no office hours on W, Feb.29.
  • (02/20) Homework 5 is due in class on Friday, February 24. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Friday, March 2.
  • (02/13) Homework 4 is due in class on Monday, February 20. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, Febrary 27.
  • (02/06) Homework 3 is due in class on Monday, February 13. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, Febrary 20.
  • (02/04) Important schedule updates: because of a snow storm campus was closed on Friday, Feb 3, and lecture 8 was cancelled. Furthermore, I will be away on a trip Feb.5-9. Schedule updates are as follows:
    • Lectures 8, 9 and 10 taped in 2010 are posted on-line
    • For on-campus students, lectures 8 and 9 will be played back in class on Monday, Feb. 6 and Wed., Feb 8, respectively. HW2 is still due in class on Monday, Feb.6. The grader will come to pick up the homeworks. All students should plan to view lecture 10 on-line.
    • There are no changes in the due dates for HW assignments. Please follow the due dates posted here and on the lecture schedule page, and ignore any annoucements or dates mentioned in on-line lectures 8, 9 and 10 from 2010.
    • There will be no office hours on Wednesday, Feb.8 or Thursday, Feb.9. Please use blog or email.
    • We will resume normal schedule with live lecture 11 on Friday, Feb.10.
  • (01/28) Homework 2 is due in class on Monday, February 6. Off-campus students should follow the on-campus due dates, but have the one-week grace period, which expires 5pm MT on Monday, Febrary 13.
  • (01/20) Homework 1 is due in class on Friday, January 27. For off-campus students, the one-week grace period expires 5pm MT on Friday, Febrary 3.
  • (01/18) A note to off-campus students: you will use Desire2Learn (D2L) system to upload your work, and see all your hw and exam scores. Please try to log in using your U of Colorado IdentiKey, and take a look at the D2L site.
  • (01/17) Handout slides (suitable for taking notes) have been posted for Lectures 1-3.
  • (01/13) Welcome to ECEN5817. Lectures are MWF 10-10:50am in ECCS 1B12 (CAETE studio), starting on Wednesday, January 18, 2012.

This course is offered in alternate spring semesters. It is being offered in Spring 2012. Instructor: Professor Dragan Maksimovic. This is one of the three courses required for the Professional Certificate in Power Electronics.

The required prerequisite for the course is ECEN 5797 Introduction to Power Electronics. Note that ECEN 5807 is not a prerequisite. This course supersedes the course previously called Power Electronics 3.

The course is offered both to regular on-campus students and also to off-campus students via CAETE. Students registered through CAETE can receive lectures via web-based streaming video, or other media. Further details of the course policies, including procedures for off-campus students, are listed on the course vitals page.

The course includes a detailed study of the mechanisms of switching loss, hard switching, and soft switching. Both traditional resonant converters and up-to-date approaches to soft switching are included. Applications emphasized include dc-dc converters for computer power and portable applications, and dc-ac inverters for gas discharge lighting ballasts. Analysis approaches include steady-state analysis in the frequency domain (using sinusoidal approximation) and time domain (state plane analysis), and small-signal ac modeling using the averaged switch modeling and the phasor transform methods. Topics include optimization of system efficiency at both full- and light-load conditions. A detailed syllabus is attached.