PWM Dc-to-Dc Power Conversion

1. 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 Dc-to-Dc Power Conversion • 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: 2012Fall●General Information Office: IT3-314 Office Hour: Fri 9:00-12:00 AM Phone: 950-6603, Home Page: http://m80.knu.ac.kr/~SMPC/●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. 2nd Edition, 2010, Young Publishing http://www.bandinlunis.com/front/product/detailProduct.do?prodId=3196848 Reference: R.W. Erickson, “Fundamentals of Power Electronics,” 1997. D. W. Hart, “Introduction to Power Electronics,” 1997, Prentice-Hall P. T. Krein, “Elements of Power Electronics,” 1998, Oxford

11. Tentative Course Outline  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.