Pulsewidth Modulated DC–to–DC Power Conversion

BYUNGCHO CHOI is a professor in the School of Electrical Engineering and Computer Science at Kyungpook National University, Daegu, Korea. He received his PhD from Virginia Polytechnic Institute and State University, Blacksburg, Virginia. Over the past twenty years, Dr. Choi has been teaching and doing research in the area of PWM DC-to-DC power conversion.

Preface vii PART I CIRCUITS FOR DC-TO-DC POWER CONVERTERS 1 PWM Dc-to-dc Power Conversion 3 1.1 Description of PWM Dc-to-dc Power Conversion 4 1.2 Dc-to-dc Power Conversion System 7 1.3 Features and Issues of PWM Dc-to-dc Converter 8 1.4 Chapter Highlights 10 References 12 2 Power Stage Components 13 2.1 Semiconductor Switches 13 2.2 Energy Storage and Transfer Devices 17 2.3 Switching Circuits in Practice 38 2.4 Summary 50 References 51 Problems 51 3 Buck Converter 69 3.1 Ideal Step Down Dc-to-dc Power Conversion 70 3.2 Buck Converter: Step Down Dc-to-dc Converter 72 3.3 Buck Converter in Start Up Transient 76 3.4 Buck Converter in Steady State 78 3.4.1 Circuit Analysis Techniques 78 3.5 Buck Converter in Discontinuous Conduction Mode 87 3.6 Closed-loop Control of Buck Converter 97 3.7 Summary 107 References 108 Problems 108 4 Dc-to-dc Power Converter Circuits 123 4.1 Boost Converter 124 4.2 Buck/Boost Converter 135 4.3 Structure and Voltage Gain of Three Basic Converters 144 4.4 Flyback Converter: Transformer Isolated Buck/Boost Converter 145 4.5 Bridge-Type Buck Derived Isolated Dc-to-dc Converters 154 4.6 Forward Converters 167 4.7 Summary 180 References 181 Problems 181 PART II MODELING, DYNAMICS, AND DESIGN OF PWM DC-TO-DC CONVERTERS 5 Modeling PWM Dc-to-dc Converters 201 5.1 Overview of PWM Converter Modeling 202 5.2 Averaging Power Stage Dynamics 204 5.3 Linearizing Averaged Power Stage Dynamics 223 5.4 Frequency Response of Converter Power Stage 230 5.5 Small signal Gain of PWM Block 235 5.6 Small signal Model for PWM Dc-to-dc Converters 236 5.7 Summary 240 References 241 Problems 241 6 Power Stage Transfer Functions 247 6.1 Bode Plot for Transfer Functions 247 6.2 Power Stage Transfer Functions of Buck Converter 266 6.3 Power Stage Transfer Functions of Boost Converter 274 6.4 Power Stage Transfer Functions of Buck/Boost Converter 284 6.5 Empirical Methods in Small signal Analysis 286 6.6 Summary 289 References 289 Problems 291 7 Dynamic Performance of PWM Dc-to-dc Converters 299 7.1 Stability 300 7.2 Frequency-Domain Performance Criteria 303 7.3 Time-Domain Performance Criteria 307 7.4 Stability of Dc-to-dc Converters 309 7.5 Nyquist Criterion 311 7.6 Relative Stability: Gain Margin and Phase Margin 318 7.7 Summary 325 References 325 Problems 326 8 Closed-loop Performance and Feedback Compensation 333 8.1 Asymptotic Analysis Method 334 8.2 Frequency-Domain Performance 341 8.3 Voltage Feedback Compensation and Loop Gain 346 8.4 Compensation Design and Closed-loop Performance 351 Performance 355 8.5 Summary 385 References 387 Problems 387 9 Practical Considerations in Modeling, Analysis, and Design of PWM Converters 409 9.1 Generalization of PWM Converter Model 410 9.2 Design and Analysis of Dc-to-Dc Converters with Practical Source System 433 9.3 Consideration for Non-Resistive Load 452 9.4 Summary 453 References 456 Problems 456 PART III CURRENT MODE CONTROL 10 Current Mode Control Functional Basics and Classical Analysis 467 10.1 Current Mode Control Basics 469 10.2 Classical Analysis and Control Design Procedures 480 10.3 Closed-loop Performance of Peak Current Mode Control 511 10.4 Current Mode Control for Boost and Buck/Boost Converters 535 10.5 Summary 551 References 553 Problems 553 11 Current Mode Control Sampling Effects and New Control Design Procedures 561 11.1 Sampling Effects of Current Mode Control 562 11.2 Expressions for s-Domain Model for Current Mode Control 569 11.3 New Control Design Procedures for Current Mode Control 586 11.4 Current Mode Control for Off-Line Flyback Converter with Optocoupler-Isolated Feedback 615 11.5 Summary 630 References 633 Problems 633 Index 637