ECE 464 Power Electronics
Fall 2009 Web Page
- Professor: Philip Krein
Email: krein AT
illinois.edu
Office Hours: Wednesdays 1:30-3 pm, 50 Everitt, or by appointment, 347 Everitt Lab
- Please note that help is also available in the lab (room
50) on Tuesdays 9:30-10:30am, 4-5pm, and on Wednesdays 3-4pm from the ECE
469 TAs.
Syllabus
Announcements --
8/24/09 Welcome to ECE 464!
The presentation used in the first session can be found here.
9/2/09
Six necessary rules for design and operation of power converters:
1. Conservation of energy.
2. The source conversion concept.
3. Kirchhoff's Voltage Law: do not attempt to
interconnect unlike voltages.
4. Kirchhoff's Current Law: provide a path for all
currents at all times.
5. The average voltage across an inductor is zero.
6. The average current through a capacitor is zero.
9/14/09 Test #1
will be held in class on Wednesday, September 30. The final exam schedule
calls out Thursday December 17 at 8:00am.
9/25/09 There will
be an optional review session on Monday, September 28 in room 50.
11/1/09 Test #2
will be held in class on Wednesday, November 11. It covers material
through Chap. 10.
11/4/09 Office
hours THIS WEEK ONLY are noon to 1pm because of a building meeting conflict.
I will also be available during some portion of the Friday open lab period.
You are welcome to send homework questions by e-mail.
11/9/09 As a
service to those who have been ill, with flu and otherwise, I have provided
access to a set of session notes that was prepared several years ago for a video
offering of the course. Please note that these on strictly on an "as-is"
basis, and for personal use by enrolled students.
Links here. No office
hours this week, given the exam Wednesday morning.
11/18/09 Prof. Krein will not be available Wednesday or Thursday,
but there will be hours in the lab staffed by the ECE 469 TAs per the regular
schedule.
Exams and Study Guides
Sample Exam with Solution Fall 2008,
Sample Exam 1
Homework and Readings, Solutions, and Reviews
- Homework Archive
- Homework #8 due Friday, October 31, 2009
Solutions
1. Problem 6 in Chap. 6.
2. An ac-ac converter has been constructed to take variable
three-phase ac from a wind generator and deliver it to a three-phase 60 Hz
ac grid. The generator output has been filtered to looks more or less
like an ac current source, but has a voltage that increases linearly with
wind speed. Its frequency ranges from 40 Hz at minimum wind speed to
300 Hz at maximum. The grid-side voltage is 4160 V line-to-line RMS.
The wind-side voltage is 5400 V line-to-line RMS at the maximum speed.
a. Draw a circuit that represents this function.
b. What switching frequencies do you recommend for the
expected operating range?
c. For the maximum wind speed, plot (and I DO NOT mean
sketch on looseleaf paper) the input voltage for any one of the line-to-line
connections. What is the amplitude of the wanted component of this
voltage?
3. Problem 4 in Chap. 7.
4. Problem 16 in Chap. 7.
5. Problem 6 in Chap. 9.
- Please read sections in Chap 7 except skip 7.4 and
7.5. Please read sections 9.1 and 9.2.
- Homework #9 due Friday, November 6, 2009
Solutions
1. Problem
9 in Chap. 9.
2. Problem 16 in Chap. 9.
3. Problem 21 in Chap. 9.
4. Problem 10 in Chap. 10.
5. Problem 3 in Chap. 10. Hint: the switching time is the
duration of the interval as a device changes from on to off or vice versa.
- Please read sections 9.3.1 and 9.4, then all of Chapter 10.
- Homework #10 due Friday, November 20, 2009
1. Problem 13 in Chap. 10.
2. Problem 2 in Chap. 11.
3. Problem 10 in Chap. 11.
4. Problem 11 in Chap. 11.
- Homework #11 due Friday, December 4, 2009
1. Problem 20 in Chap. 11.
2. Problem 24 in Chap. 11
3. Problem 2 in Chap. 12
4. Problem 4 in Chap. 12
5. Problem 12 in Chap. 12.
- Please read all of Chap. 12
Other Material
Grainger Award
Last updated on
11/20/2009