Efficiency Enhanced DC-DC Converter Using Dynamic Inductor Control (eBook)

Omar Abu Mohareb has earned his doctoral degree in Automotive Mechatronics Engineering from University of Stuttgart. He is now active in electromobility field and its efficient and smart infrastructure concepts. He has also earned his first patent on the proposed dynamic inductor control (DIC) concept.

Acknowledgement and Dedication 6
Table of Contents 7
List of Figures 10
List of Tables 15
Abbreviations and Nomenclatures 16
Abstract 21
Kurzfassung 23
1 Introduction 25
1.1 Motivation 25
1.2 Scope 26
1.3 Dissertation Outline 27
2 Literature Review and State of the Art 29
2.1 Literature Review on Efficient DC-DC Converters 29
2.2 Inductor in DC-DC Converter 32
2.3 Effect of Inductor Current on Inductance Value 34
2.4 Inductance Value Effect on Root Mean Square Losses 36
2.5 State-of-the-Art of Inductor Control in DC-DC Converters 38
3 Boost Battery Charger Modeling 41
3.1 Modeling Non-Ideal Components 43
3.1.1 Lithium-Ion Battery Model 43
3.1.2 DC Power Source Model 45
3.1.3 Inductor Model 46
3.1.4 Capacitor Model 47
3.1.5 Power Switches Models 47
3.2 Boost Battery Charger Models 49
3.2.1 State-Space Averaging Model 50
3.2.2 Canonical Model 57
3.3 Maximum Energy Transfer in DC-DC Converters 60
4 Dynamic Inductor Control Concept 64
4.1 Inductance Value Effect on Efficiency 64
4.2 Variable Inductor Structure 66
4.3 Control Methodology 71
4.4 Stability Investigation 75
4.5 Advantages of Dynamic Inductor Control 78
5 Dynamic Inductor Control Simulation 79
5.1 Controller Simulation 79
5.2 Simulation Assumptions and Parameters 81
5.3 Simulation Results 83
5.4 Evaluating DIC with other DC-DC Converter Type 87
5.5 Maximum Energy Transfer Evaluation 89
6 Dynamic Inductor Control Implementation 93
6.1 Prototype Converter with Dynamic Inductor Control 93
6.2 Controller Implementation 96
7 Experimental Results 101
7.1 Steady-State Performance with Dynamic Inductor Control 101
7.1.1 Steady-State Performance at Different Load Currents 101
7.1.2 Steady-State Performance at Different Source Voltages 105
7.1.3 Comparison of Efficiency with Conventional Boost Converter 106
7.1.4 Performance as Li-ion Battery Charger 108
7.2 Transient Performance of Converter with Dynamic Inductor Control 113
7.2.1 DC-DC Converter Transient Performance as DIC is Enabled 113
7.2.2 Step-Changed Source Voltage Transient with Enabled DIC 115
7.2.3 Load Transient with Enabled DIC 117
8 Conclusions and Future Work 121
8.1 Conclusions 121
8.2 Future Work 123
References 125
Appendix 133
A1. Battery Boost Charger Canonical Model 133
A2. Simulink Models 136
A3. Schematic and Bill of Materials for the Prototype 140
A4. Transfer Functions Analysis of Current Sensor 151