1. PWM Dc-to-Dc Power Conversion
Chapter 1
PWM Dc-to-Dc Power Conversion
Pulsewidth Modulated Dc-to-DC Power Conversion

2. Head Lamp Drive Circuit in Automobile
Energy Source and Load
- Source:
- Load:
Conventional Resistive Solution
- Control low:
- Ohmic loss at:
Dc-to-Dc Power Conversion

3. Problem of Resistive Solution
Assumptions:
- Ploss :
- Efficiency :
Consequence of poor efficiency
Dc-to-Dc Power Conversion

4. Dc-to-Dc Power Conversion as Alternative Solution
Control law:
No power loss in circuit:

5. Dc-to-Dc Power Conversion
Power conversion: Changing electrical energy/power from one form to
another form using electronics devices
Examples:
Power electronics: Electronic engineering that deals with all types of
power conversions while questing the
Dc-to-Dc power conversion: Process of changing the voltage level of a dc
source to another value
Dc-to-Dc Power Conversion

6. Classification of Power Conversion
Dc-to-Dc Power Conversion

7. Dc-to-Dc Power Conversion System
Dc source with non-ideal characteristics
- Standalone dc source:
- Rectified ac source:
Dc-to-Dc Power Conversion
Load as dynamic current sink with non-resistive impedance
- Electric equipment: non-resistive load impedance

8. Dc-to-Dc Power Conversion System
Dc-to-dc converter as voltage source
Function of dc-to-dc converter:
Elements of dc-to-dc converter
- Power stage: semiconductor switch
- Controller: processors, ICs, and discrete components
Dc-to-Dc Power Conversion

9. Features and Issues of PWM Dc-to-Dc Converter
Power stage components
- Semiconductors: high frequency switching
- Inductors and capacitors: periodic voltage/current excitation
- Transformers: periodic voltage/current excitation
Power stage configurations
- Accommodation of input voltage and load current requirements
- Very large or very small voltage conversion ratio
- Galvanic isolation between source and load
Dynamic modeling and analysis
- Closed-loop feedback control: stability
- Dynamic modeling to accommodate conventional analysis technique
Dynamic performance and controller design
- Static and dynamic performance
- Dynamic performance: stability, transfer functions, transient responses
- Feedback controller design for optimal dynamic performance
Dc-to-Dc Power Conversion

10. POWER ELECTRONICS: 2012 Fall ● General Information Office: IT Office Hour: Fri 9:00-12:00 AM Phone: , Home Page: ● Course Objective: As an introductory course in power electronics, the class will address basic principles, analysis techniques, and applications of modern power electronics with a strong emphasis on switchmode dc-to-dc power conversions. The students would learn methods of solving various power electronics problems using their knowledge about electronics, circuit theories, and control theories. ● Text: Byungcho Choi, “Fundamentals of Switchmode Dc-to-Dc Power Conversions nd Edition, 2010, Young Publishing   Reference: R.W. Erickson, “Fundamentals of Power Electronics,” D. W. Hart, “Introduction to Power Electronics,” 1997, Prentice-Hall P. T. Krein, “Elements of Power Electronics,” 1998, Oxford  

11. Tentative Course Outline
Topic
Major Contents
Week
Chapter 1: Basics of
Power Electronics
 Introduction to power electronics
 Semiconductor switches and switching circuits
 Energy storage/transfer devices and switching circuits
3 weeks
Chapter 2: Step-down Dc-to-Dc Power Conversion Circuit:
Buck Converter
 Basic principles of buck converter
 Time-domain analysis of buck converter
 Discontinuous-conduction mode of operation
 Closed-loop control of buck converter
3 week
Chapter 3: Dc-to-Dc Power Converter Circuits
 Step-up dc-to-dc converter
 Buck/boost converter
1 week
Midterm Test
 Flyback converters
 Bridge-type converters
 Forward converters
2 weeks
Chapters 4, 5, and 6: Modeling, Control Design and
Analysis of PWM Converters
 Average modeling of PWM converters
 Small-signal modeling of PWM converters
 Small-signal analysis of PWM dc-to-dc converters
 Compensation design and closed-loop analysis
4 weeks
Final Exam
 Grading Policy:
Midterm Test: 42%, Final Exam: 42%, Homework: 16%
 Honor System:
Students should develop their own solutions to homework problems.
Late homework will not be accepted with no exceptions.