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PWM Dc-to-Dc Power Conversion Pulsewidth Modulated Dc-to-DC Power Conversion

PWM Dc-to-Dc Power Conversion

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Chapter 1. PWM Dc-to-Dc Power Conversion. Pulsewidth Modulated Dc-to-DC Power Conversion. Head Lamp Drive Circuit in Automobile. Energy Source and Load - Source: - Load: Conventional Resistive Solution - Control low: - Ohmic loss at:. - PowerPoint PPT Presentation

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Page 1: PWM Dc-to-Dc Power Conversion

PWM Dc-to-Dc Power Conversion

Pul

sew

idth

Mod

ulat

ed D

c-to

-DC

Pow

er C

onve

rsio

n

Page 2: PWM Dc-to-Dc Power Conversion

2

22

Head Lamp Drive Circuit in Automobile● Energy Source and Load

- Source:

- Load:

● Conventional Resistive Solution

- Control low:

- Ohmic loss at:

Dc-

to-D

c P

ow

er

Con

vers

ion

Controller

xR OI

BV oROV

Page 3: PWM Dc-to-Dc Power Conversion

3

33

Problem of Resistive Solution

● Assumptions:

- Ploss : - Efficiency : ● Consequence of poor efficiency

Dc-

to-D

c P

ow

er

Con

vers

ion

Controller

xR OI

BV 60 W@ 12 VOV

Page 4: PWM Dc-to-Dc Power Conversion

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44

Dc-to-Dc Power Conversion as Alternative Solution

● Control law:

● No power loss in circuit:

Dc-

to-D

c P

ow

er

Con

vers

ion

Controller

a

Switch network

BV

Xv

BV

onT

sT

Ov

p

Ov

Xv

Page 5: PWM Dc-to-Dc Power Conversion

5

55

● 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 ConversionD

c-to

-Dc

Po

we

r C

onve

rsio

n

Page 6: PWM Dc-to-Dc Power Conversion

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66

Classification of Power Conversion

AC

Converters

Inverters

Cyclo-

converters

AC DC

DCRectifiers

Dc-

to-D

c P

ow

er

Con

vers

ion

Page 7: PWM Dc-to-Dc Power Conversion

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77

● Dc source with non-ideal characteristics - Standalone dc source: - Rectified ac source:

Dc-to-Dc Power Conversion System

● Load as dynamic current sink with non-resistive impedance - Electric equipment: non-resistive load impedance

Dc-

to-D

c P

ow

er

Con

vers

ion

Dcsource

Power stageLoad

Controller

Dc-to-dc converter

Page 8: PWM Dc-to-Dc Power Conversion

8

88

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

μ

Dc-

to-D

c P

ow

er

Con

vers

ion

Dcsource

Power stageLoad

Controller

Dc-to-dc converter

Page 9: PWM Dc-to-Dc Power Conversion

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99

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-D

c P

ow

er

Con

vers

ion

Page 10: PWM Dc-to-Dc Power Conversion

POWER ELECTRONICS: 2012 Fall

● 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://w w w.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

Page 11: PWM Dc-to-Dc Power Conversion

Tentative Course Outline

Topic Major Contents WeekChapter 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 TestChapter 3: Dc-to-Dc Power

Converter Circuits 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.