ECE562 Power Electronics Schedule and Grading

1 1 ECE562 Power Electronics Schedule and Grading Class Time: Tuesday and Thursday 5:30 6:45 PM in B105 (Engineering B wing) Instructor: Professor George Collins, Email: Text Book: Fundamentals of Power electronic , by R. W. Erickson and D. Maksimovic Class website: Link to course lectures: COURSE OBJECTIVES This course will teach students how to understand, analyze, design and better employ new commercial IC Power supplies on a chip or on a board in any electronic system requiring powered DC levels different from the general DC system bus. Typically this is 6-12 additional DC levels. One illustrative commercial example is a remarkable Dialog Semiconductor product which provides, on ONE IC chip: 18 LDO( low drop out regulators) for low noise voltages needed for cell phone transceivers , two Buck converters for cell phone processors and semiconductor memory Power supplies and one Boost converter for both driving LEDS for LCD screen backlighting or for the flash camera.

2 ALL on one IC chip and driven by the batteries!! Texas Instruments has similar products. This kind of chip allows for low cost cell phones employing various chips with various DC voltages all from one rail voltage. This course will cover the two major approaches to high efficiency DC-DC conversion in detail: Pulse width modulation and resonant converters. Both employ ideal lossless L-C networks and ideal lossless switches. The DC-DC PWM conversion is primarily an IC solution to point of load DC Power requirement and the resonant DC-DC conversion is for high performance DC Power applications at kW levels, usually implemented on PC boards with discrete components, often called BRICKS. However, some attention will be given to linear Power supplies like low drop out regulators and switched capacitor supplies for a comparison to our two circuit types. Moreover LDO s provide the lowest ripple rails for powering critical Electronics devices Grading for 562 Power Electronics We will emphasize group efforts with teams of students handing in weekly HW sets and take home POP quizzes.

3 PLEASE FORM a GROUP for HW, Spice Labs, POP QUIZZES and for group presentations, described below, ASAP in the first week of the semester. In a nut shell the ECE562 Grading is scored as follows in 6 parts: 1. Four HW Homework assignments pt each will comprise 5 % of the grade. See page 4 of this document for details of assignments and due dates from Chapters 2,3,4and 5. In general HW 2 assignments are due on Tuesdays. I will email each of you to remind you of HW problem changes and due date changes if any. 2. Five Spice assignments@ 2 pts each are worth 10 % and are listed later. In general Spice labs are due on Tuesdays too, usually when no HW is due. 3. Talk #1/Paper #1 given as a group effort will count for 20%. Talk # 1 will occur weeks 5 and 6 of the semester. For 2012 this is from 18 to 27 Sept. Each group must sign up for a specific date and with the same topic for TALK # 1 Coupled Inductors Employed in PWM Converters For Reducing current ripple: theory and applications.

4 Let me know if you need a specific date as early as possible. Email the PPT SLIDES and the Word Paper to me as attachments so I have a record of their receipt date versus the due date. 4. Talk #2/Paper #2 given as a group effort will count for 31%. Talk # 2 will occur weeks 12 and 13 of the semester. For 2012 this is from 6 to 16 Nov. Each group must sign up for a specific date and cover the topic of Right Half Plane Zero s ( RHPZ S) in the open loop Gain of PWM Converters: Stability issues Encountered with RHPZ S in Closed Loop . Our text is a good first source for this talk as is the website of EDN magazine. Choose three converters to discuss. Let me know if you need a specific talk date for your group as early as possible. Again email the final PPT SLIDES and the final Word Paper to me only (NOT THE GRADER) as attachments, so I have a record of their receipt date versus the due date.

5 5. I count 24% for eight weekly class pop quizzes @ 3 pts each and are done as a group effort. Each student will receive an email from me each week detailing the Pop Quiz Questions for the week. Again email the PPT SLIDE Answers for the pop quizzes as electronic attachments on the due date of THURSDAY the week after the assignment was given, so I have a record of their receipt date time from your group versus the official due date. Late assignments lose points. 6. Exams will count for 10% and are done INDIVIDUALLY in class. Tentatively the exam will occur on Thur week 11. For 2012 this exam is tentatively on 1 Nov 1-6 add up to 100% and will be the basis for 562 grades. ALL TOGEATHER NOW one super 562 Schedule : HW Spice, Talks and Pop Quizzes DATES Week # Tues Due Date Thur Due Date Tues 28/ 30 Aug 2 Buck Spice Pop Quiz # 1 Tues 4/6 Sept 3 Boost Spice Pop Quiz # 2 Sign up your group for one of four talk dates in weeks 5 and 6 Tues 11/13 Sept 4 Buck Boost Spice Pop Quiz # 3 And HW Ch 2 WEEKS 5 and 6 which is in 2012 18 to 27 Sept TALK # 1 All groups have the same topic Coupled Inductors in PWM Converters and reducing current ripple.

6 Theory and application HW and Spice HW is still due in week # 6 as shown below 3 Tues 25/27 Sept 6 SEPIC Spice Pop Quiz # 4 2 Oct 7 Cuk Spice 9/11 Oct 8 HW Ch 3 Pop Quiz # 5 16/18 Oct 9 Pop Quiz # 6 23/25 Oct 10 HW Ch 4 Pop Quiz # 7 DATES Week # Tues Due Date Thur Due Date Sign up your group for one of four talk dates in weeks 12 and 13 30 Oct/ 1 Nov 11 EXAM Pop Quiz # 8 NO MORE Pop Quizzes after 1 Nov Weeks 12 and 13: 6 Nov to 15 Nov TALK # 2 for all groups the same general topic is Right Half Plane Zero s in the open loop Gain of PWM Converters: Stability issues Encountered in Closed Loop . Choose up to three converters to discuss. But one will make the case. Thanks giving break from 19 to 25 Nov 27/29 Nov 14 HW Ch 5 4 / 6 Dec 15 Special Lecture 4 Dec and grade estimate 6 Dec Disclaimer Notice: All items in this memo are subject to change by Prof.

7 Collins in LATER class announcements and items are considered only a preliminary guide to the student. For example, the ECE562 classes can cover high frequency magnetics/transformers/inductors rather than more details of PWM circuits or basics of resonant converters, if strong class interest exists each semester is unique in its class preferences in this diverse field. In week # 9 we will have a mid class review of past and future topics in which you are encouraged to input your desires for the remainder of the class lectures. See in class participation grade issues section. Disclaimer Notice: All items in this memo are subject to change by Prof. Collins in LATER class announcements and items are considered only a preliminary guide to the student. For example, the ECE562 classes can cover high frequency magnetics/transformers/inductors rather than more details of PWM circuits or basics of resonant converters, if strong class interest exists each semester is unique in its class preferences in this diverse field.

8 In week # 9 we will have a mid class review of past and future topics in which you are encouraged to input your desires for the remainder of the class lectures. See in class participation grade issues section. 4 However, some students need a better 562 grade for various reasons here is a chance to earn it, by doing 7 and 8 below. 7. Up to 5% of the grade will be for in class participation-you cannot act like a potted plant and expect credit for this portion. Folks who interrupt or bring to lectures quality questions or important comments will earn these points. I love questions from the class. You are paying to be taught and I am being paid to teach so ask lots of questions. Do not act like a potted plant in class. 8. In addition I will give up to 5 extra points on the final grade for a pre approved special project to improve the 562 course in future years (See me and we will write a contract together).

9 An example is to design buck, boost, buck boost, cuk and sepic using the TI website below Of course you will need to submit PDF s of all you key screen shots to get credit. YES the possible total is >100 % and final grades will be curved as described below: Our approach will be more traditional with both + and - letter grades to achieve a sliding curve and a distribution of grades..In an ideal statistical world we would seek in a class grade distribution as follows: Grading will be curved with students above the median receiving an A , students below the median and above one standard deviation below the median receiving a B . 1 to 2 standard deviations below the median will receive a C , 2 to 3 standard deviations below will receive a D , and anything lower will receive an F . Generally this means: A > 95 B > 85 C > 75 D > 65 In summary, Grading for 562 is in six parts as indicated above with opportunity for both group and individual efforts.

10 Group efforts are encouraged in HW, Spice assignments and talks as well as papers. Groups of up to but not to exceed 6 students per group are acceptable to encourage team efforts and provide the opportunity to learn team dynamics. Upon leaving CSU you will work in a company in teams the Word and PowerPoint skills you learn in presenting technical materials in 562 will be to YOUR benefit. The practice and experience of living with the psychodrama of technical group efforts will also benefit you personally. DETAILED Schedule on HW Assignments, Spice Assignments, Pop Quizzes and Grading for each At the end of this I will present a table of ALL assignment due dates throughout the semester 1. Exam and Pop Quizzes (34 points total for 8 pop quizzes and one exam) 5 a. In class WEEKLY pop quizzes @ 3pts each for a total of 24 points on material from the recent weeks in class material can be done as a group effort.