Transcript Distance Learning and use of the Internet and the World
Web-Based Delivery of the First Course in Power Electronics Amman – Jordan December 16-17
Issa Batarseh School of Electrical Engineering and Computer Science University of Central Florida.
Orlando, Florida 32816 Email: [email protected]
Introduction
The role of technology in education has never been greater: capabilities, cost.
The Internet has been utilized as the ideal medium to create platforms for students to use for its wide availability.
There is a pressing need for developing original web-based multi-media learning environment.
None of today's web-based educational tools allow students to perform a generalized and real time simulation of engineering problems in the interactive web-based instructional environment.
Introduction(cont.)
Power electronics is the fastest growing area in electrical engineering.
US universities have not kept pace with the growth of power electronics field, and are not educating students in sufficient numbers The writing of this paper is motivated primarily by the current multimedia delivery efforts underway at the University of Central Florida (UCF) to develop undergraduate and graduate curriculum in power electronics.
Methods of Delivery
Classroom (Live) fixed in time and location Distance any time any place meets needs of non traditional students maintain classes at branch campuses
Methods of Distance Learning
Textbooks
Radio/TV
By Correspondences
Taped Lectures
Video Streaming
Interactive TV
Internet/web Based live feeding
Internet Based
Universal access Moderate cost (free to students) Complement classroom instruction and make learning easier.
Learn a new technology that is here to stay Potential for improving critical thinking and problem solving skills.
interaction between students and faculty.
Highly interactive via Web and e-mail Foster independence and autonomy among students.
Higher students satisfaction.
High participation in discussion.
Internet Based Courses (cont.)
Potential Problems
Low bandwidth (delays in transmitting audio and video information).
Learning curve, hardware and software Budgetary restrictions.
Students with limited writing and communication skills are at disadvantage.
Possible delays due to technical difficulties.
Web Based Power Electronic Courses 8 Universities were surveyed by email:
Limited web based activities
Documentation/information
Limited interaction with students
Lack of design on line
Lack of simulation on line
Web Based Power Electronic Courses
Table I Summary of on-line PE Survey
1.
No. of Institutions offer P.E. Courses
2.
No. of on-line PE Courses
Fully on the web courses 3.
List of Multimedia Tools
- Information about the course - Full Lectures on line - Homework Assignments are provided on line - - - - - Homework Assignments are taken on line Exams/Quizzes are given on line Sample exams online. Student profiles Design on-line 4.
What form if interaction do you have with your students:
- Email - Bulletin boards - Videos 5.
Do you use Web-CT for your courses
? 7 6 4 7 5 7 1(soon) 2 4 2 0 7 4 4 2+1(soon)
UCF Experience
Web-CT has been the main platform used to develop courses on line.
Courses are either: – (W) Fully on the Web to reduce classroom seating – (M) Mixed-mode course – (E) Web Enhanced in which the web is used to enhance course delivery.
The
Fully on the Web Courses
are offered fully via the web through which students are not required to attend the class.
Mixed/Web-Enhanced Courses
students use both live lectures and the web to go through the course.
UCF Experience (cont.)
FEEDS:
System Florida Engineering Educational Delivery College of Engineering and Computer Science has been involved with video-taped classes for more than 15 years.
UCF had 120 classes at 51 sites .
(The Florida State System has more than 484 classes at 156 sites) By combining both the Internet and the existing videotaped delivery, the program was able to offer courses to more students at more remote locations.
Power Electronics Courses
At UCF, two power electronics courses are offered periodically; – EEL 5245 Power Electronics I – EEL 6246 Power Electronics II A third course that discusses dynamic modeling and controller design is offered as – EEL 6271 Advanced Electronics I
Power Electronics Courses
Table II Detailed course outlines for First Course in Power Electronics
POWER ELECTRONICS I
d) Cuk Converter 3.3.2 Isolated Switch-Mode Power converters a) Single-ended Isolated Forward Converter b) Double-ended Isolated Forward Converter c) Flyback converter
I. Introduction
1.1 Overview of the Course 1.2 Why Power Electronics ?
1.3 Overview and Applications of Power Electronics
II. Review Material
2.1 Modern Switching Semiconductor Devices (Diodes, BJTs, MOSFETs, Thyristors, GTOs, IGBTs) 2.2 Switching Characteristics 2.3 The Ideal Switch and Switching Functions 2.4 Magnetics: materials and properties 2.5 Transformers 2.6 Three-phase Systems
III. DC-TO-DC Switch-mode Converters
3.1 Concept of Source Conversion: source <--> load 3.2 Linear Regulators 3.3 Switch-mode Converters 3.3.1 Non-Isolated Switch-mode Converters: Continuous Conduction Modes (CCM).
Discontinuous Conduction Modes (DCM).
a) Buck Converter b) Boost Converter c) Buck-Boost Converter
IV. DC-to-AC Inverters
4.1 Principle of Operation 4.2 Single-phase Inverters 4.3 Equal Pulse Modulation 4.4 Sinusoidal PWM 4.5 Three-phase Inverters
V. Diode Circuits and Rectifiers (AC-to-DC Conversion)
5.1 Rectifier Concepts 5.2 Single Phase Half- and Full-wave Diode Rectifiers with: a) Resistive load b) Inductive load c) Capacitive load 5.3 Three-phase Full-wave Rectifiers
VI. Phase-Controlled Rectifiers (AC-to-DC Conversion)
6.1 Natural and Forced Commutation Concepts 6.2 Principle of Phase-Controlled Converters 6.3 Single-phase Full Converters
The First Power Electronics Course: Fall 2000
The Web Site: http://reach.ucf.edu/~eel5245/ The site contains; – detailed course outline, – lectures, – homework assignments, – sample exams, – quizzes on line, – exam on line – Student information/course grades
Logging on:
Figure 1 Welcome page for the course, with the login screen shown.
Fig. 2(a) Student view of the main page of the course Web-CT site.
Fig. 2(b) The instructor and editor view of the course Web-CT site.
Fig. 3 The course home Web Site for the class
Quizzes and Exams;
The Web-CT environment allows student tracking and providing quizzes and exams on line.
Developed quizzes and one exam on-line.
This makes it possible for students to take open book, open-note exams anywhere and any time within the time window set by the instructor.
Future Trends;
Growth in power electronics education and research will continue to grow in the near future To develop an effective power electronics education it is important to have simulation and hardware laboratory support in conjunction with the course material.
Web-based education must include more on-line course offerings advanced graphical-user-interface tools, on-line exams, interactive discussion, and even web-based interactive circuit and system simulations.
Additional work is needed in developing web-based interactive simulation/design and experiential learning.
On-Line Power Electronics Simulation:
Computer simulation and computer tools play very important role delivering effective power electronics education.
In UCF; Students will have free access that will allow them through a GUI to be able to design build and simulate circuit engineering problems on line.
This will provide an innovative method for interactive teaching and on-line design testing.
The on-line Pspice computer simulation of engineering problems will help students better understand abstract engineering principles, and will have multiple opportunities to solve engineering design problems.