Sneak Circuits of Power Electronic Converters

Sneak Circuits of Power Electronic Converters

Work on sneak circuits and related analysis methods for power converters contributes to the reliability of power electronic systems worldwide. Most books on the subject focus on electronic systems; this book is perhaps the first to examine power electronic systems. The authors describe sneak circuit phenomena in power converters, introduce SCA methods for power electronic systems, and propose how to eliminate and make use of sneak circuits.

This book:

* highlights the advanced research works in sneak circuit analysis by a leading author in the field

* is original in its treatment of power electronics converters, going beyond the electronic system level

* is suitable for both introductory and advanced levels

* offers guidelines for industry professionals involved in the design of power electronic systems, enabling early detection of potential problems

This book is geared for researchers and graduate students in electrical engineering, as well as engineers and researchers in power electronics. Researchers in power electronics reliability will also find it to be a helpful resource.

Bo Zhang South China University of Technology, P. R. China.

Dongyuan Qiu South China University of Technology, P. R. China.

Sneak Circuits of Power Electronic Converters

Work on sneak circuits and related analysis methods for power converters contributes to the reliability of power electronic systems worldwide. Most books on the subject focus on electronic systems; this book is perhaps the first to examine power electronic systems. The authors describe sneak circuit phenomena in power converters, introduce SCA methods for power electronic systems, and propose how to eliminate and make use of sneak circuits.

This book:

• highlights the advanced research works in sneak circuit analysis by a leading author in the field
• is original in its treatment of power electronics converters, going beyond the electronic system level
• is suitable for both introductory and advanced levels
• offers guidelines for industry professionals involved in the design of power electronic systems, enabling early detection of potential problems

This book is geared for researchers and graduate students in electrical engineering, as well as engineers and researchers in power electronics. Researchers in power electronics reliability will also find it to be a helpful resource.

Inhalt

About the Authors xi

Preface xiii

Acknowledgments xvii

1 Sneak Circuit and Power Electronic Systems 1

1.1 Reliability of Power Electronic Systems 1

1.2 Sneak Circuit 2

1.2.1 Definition of Sneak Circuit 2

1.2.2 Examples of Sneak Circuits 3

1.2.3 Basic Causes of Sneak Circuit 9

1.3 Sneak Circuit Analysis 10

1.3.1 Definition of Sneak Circuit Analysis 10

1.3.2 History of Sneak Circuit Analysis 10

1.3.3 Methods of Sneak Circuit Analysis 11

1.3.4 Benefits of Sneak Circuit Analysis 12

1.3.5 Relationship between Sneak Circuit Analysis and other Safety Techniques 13

1.4 Power Electronic System and Sneak Circuit Analysis 14

1.5 Arrangement of this Book 15

References 15

Part I SNEAK CIRCUIT PHENOMENA

2 Sneak Circuits of Resonant Switched Capacitor Converters 19

2.1 Introduction 19

2.2 Sneak Circuits of Basic RSC Converter 19

2.2.1 Sneak Circuits of Basic Step-Down RSC Converter 20

2.2.2 Sneak Circuits of Basic Step-Up RSC Converter 27

2.2.3 Sneak Circuits of Basic Inverting RSC Converter 34

2.2.4 Sneak Circuit Performance of Basic RSC Converters 37

2.3 Sneak Circuits of High-Order RSC Converter 37

2.3.1 Sneak Circuits of High-Order Step-Down RSC Converter 38

2.3.2 Sneak Circuits of High-Order Step-Up RSC Converter 47

2.4 Summary 57

References 57

3 Sneak Circuits of DC-DC Converters 59

3.1 Introduction 59

3.2 Buck Converter 59

3.2.1 CCM of Buck Converter 59

3.2.2 DCM of Buck Converter 61

3.2.3 Operating Conditions of Buck Converter 62

3.3 Boost Converter 63

3.3.1 CCM of Boost Converter 63

3.3.2 DCM of Boost Converter 65

3.3.3 Operating Conditions of Boost Converter 66

3.4 Buck-Boost Converter 67

3.4.1 CCM of Buck-Boost Converter 67

3.4.2 DCM of Buck-Boost Converter 68

3.4.3 Operating Conditions of Buck-Boost Converter 70

3.5 Sneak Circuit Conditions of Buck, Boost, and Buck-Boost Converters 71

3.6 Cúk Converter 71

3.6.1 Normal Operating Mode of Cúk Converter 71

3.6.2 Sneak Circuit Phenomena of Cúk Converter 74

3.6.3 Experimental Verification of Cúk Converter 81

3.7 Sepic Converter 84

3.7.1 Normal Operating Mode of Sepic Converter 84

3.7.2 Sneak Circuit Phenomena of Sepic Converter 89

3.7.3 Experimental Verification of Sepic Converter 91

3.8 Zeta Converter 91

3.8.1 Normal Operating Mode of Zeta Converter 94

3.8.2 Sneak Circuit Phenomena of Zeta Converter 98

3.8.3 Experimental Verification of Zeta Converter 100

3.9 Sneak Circuit Conditions of Cúk, Sepic, and Zeta Converters 102

3.10 Summary 103

References 103

4 Sneak Circuits of Soft-Switching Converters 105

4.1 Introduction 105

4.2 Sneak Circuits of Full-Bridge ZVS PWM Converter 105

4.2.1 Normal Operating Mode of FB ZVS PWM Converter 106

4.2.2 Zero Voltage Switching Conditions of FB ZVS PWM Converter 112

4.2.3 Sneak Circuit Phenomena of FB ZVS PWM Converter 112

4.2.4 Operating Conditions of FB ZVS PWM Converter 118

4.2.5 Experimental Verification of FB ZVS PWM Converter 119

4.3 Sneak Circuits of Buck ZVS Multi-Resonant Converter 122

4.3.1 Normal Operating Mode of Buck ZVS MR Converter 123

4.3.2 Sneak Circuit Phenomenon of Buck ZVS MR Converter 126

4.3.3 Simulation Verification of Buck ZVS MR Converter 128

4.4 Sneak Circuits of Buck ZVT PWM Converter 128

4.4.1 Normal Operating Mode of Buck ZVT PWM Converter 130

4.4.2 Sneak Circuit Phenomenon of Buck ZVT PWM Converter 133

4.4.3 Simulation Verification of Buck ZVT PWM Converter 136

4.5 Summary 137

References 137

5 Sneak Circuits of other...