Pulse-width Modulated DC–DC Power Converters

810 Pages·2008·7.08 MB·English

Pulse-width Modulated DC–DC
Power Converters
MARIAN K. KAZIMIERCZUK
Wright State University
Dayton, Ohio, USA
A John Wiley and Sons, Ltd, Publication

Pulse-width Modulated DC–DC
Power Converters

Pulse-width Modulated DC–DC
Power Converters
MARIAN K. KAZIMIERCZUK
Wright State University
Dayton, Ohio, USA
A John Wiley and Sons, Ltd, Publication
Thiseditionfirstpublished2008
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Contents
Preface xix
About the Author xxi
List of Symbols xxiii
1 Introduction 1
1.1 Classification of Power Supplies 1
1.2 Basic Functions of Voltage Regulators 3
1.3 Power Relationships in DC–DC Converters 5
1.4 DC Transfer Functions of DC–DC Converters 5
1.5 Static Characteristics of DC Voltage Regulators 6
1.6 Dynamic Characteristics of DC Voltage Regulators 9
1.7 Linear Voltage Regulators 12
1.7.1 Series Voltage Regulator 13
1.7.2 Shunt Voltage Regulator 14
1.8 Topologies of PWM DC–DC Converters 17
1.9 Relationships among Current, Voltage, Energy, and Power 18
1.10 Electromagnetic Compatibility 19
1.11 Summary 20
1.12 References 20
1.13 Review Questions 21
1.14 Problems 22
2 Buck PWM DC–DC Converter 23
2.1 Introduction 23
2.2 DC Analysis of PWM Buck Converter for CCM 23
2.2.1 Circuit Description 23
2.2.2 Assumptions 27
2.2.3 Time Interval 0<t ≤DT 27
2.2.4 Time Interval DT<t ≤T 28
2.2.5 Device Stresses for CCM 29
2.2.6 DC Voltage Transfer Function for CCM 29
viii CONTENTS
2.2.7 Boundary between CCM and DCM 30
2.2.8 Ripple Voltage in Buck Converter for CCM 32
2.2.9 Switching Losses with Linear MOSFET Output
Capacitance 37
2.2.10 Switching Losses with Nonlinear MOSFET Output
Capacitance 39
2.2.11 Power Losses and Efficiency of Buck Converter for CCM 42
2.2.12 DC Voltage Transfer Function of Lossy Converter for
CCM 46
2.2.13 MOSFET Gate-drive Power 47
2.2.14 Design of Buck Converter for CCM 48
2.3 DC Analysis of PWM Buck Converter for DCM 51
2.3.1 Time Interval 0<t ≤DT 54
2.3.2 Time Interval DT<t ≤(D +D )T 56
1
2.3.3 Time Interval (D +D )T <t ≤T 57
1
2.3.4 Device Stresses for DCM 57
2.3.5 DC Voltage Transfer Function for DCM 57
2.3.6 Maximum Inductance for DCM 59
2.3.7 Power Losses and Efficiency of Buck Converter for DCM 61
2.3.8 Design of Buck Converter for DCM 63
2.4 Buck Converter with Input Filter 69
2.5 Buck Converter with Synchronous Rectifier 69
2.6 Buck Converter with Positive Common Rail 72
2.7 Tapped-inductor Buck Converters 74
2.7.1 Tapped-inductor Common-diode Buck Converter 74
2.7.2 Tapped-inductor Common-transistor Buck Converter 76
2.7.3 Watkins–Johnson Converter 76
2.8 Multiphase Buck Converter 77
2.9 Summary 79
2.10 References 81
2.11 Review Questions 81
2.12 Problems 82
3 Boost PWM DC–DC Converter 85
3.1 Introduction 85
3.2 DC Analysis of PWM Boost Converter for CCM 85
3.2.1 Circuit Description 85
3.2.2 Assumptions 88
3.2.3 Time Interval 0<t ≤DT 88
3.2.4 Time Interval DT<t ≤T 89
3.2.5 DC Voltage Transfer Function for CCM 90
3.2.6 Boundary between CCM and DCM 91
3.2.7 Ripple Voltage in Boost Converter for CCM 93
3.2.8 Power Losses and Efficiency of Boost Converter for CCM 95
3.2.9 DC Voltage Transfer Function of Lossy Boost Converter
for CCM 97
3.2.10 Design of Boost Converter for CCM 99
3.3 DC Analysis of PWM Boost Converter for DCM 103
3.3.1 Time Interval 0<t ≤DT 105