Fast transient Voltage Regulator Module_PHD

kevinwjs

TABLE OF CONTENTS
1 CHAPTER ONE....................................................................................................... 1
1.1 BACKGROUND...................................................................................................... 1
1.2 TECHNICAL CHALLENGES FOR VRM DESIGN........................................................ 4
1.2.1 Transient Response ...................................................................................... 4
1.2.2 Power Devices ............................................................................................. 9
1.2.3 The High-Input-Voltage Voltage Regulator Module ................................... 12
1.3 OBJECTIVES AND DISSERTATION OUTLINE .......................................................... 16
1.3.1 Fast-Transient Low-Voltage VRMs ............................................................ 16
1.3.2 Current-Sensing and Current-Sharing Control in VRMs ............................ 17
1.3.3 Improved Light-Load Efficiency for Synchronous Rectifier Applications .... 17
1.3.4 High Input Voltage VRMs.......................................................................... 18
1.3.5 Future VRMs ............................................................................................. 18
2 CHAPTER TWO.................................................................................................... 19
2.1 INTRODUCTION................................................................................................... 19
2.2 LIMITATION OF TODAY’S TECHNOLOGY............................................................... 21
2.2.1 Transient Limitation .................................................................................. 21
2.2.2 Efficiency Limitation.................................................................................. 33
2.3 CANDIDATE VRM TOPOLOGIES.......................................................................... 36
2.3.1 Fast transient VRM topology ..................................................................... 36
2.3.2 Fast VRM with small ripple ---- interleaved QSW VRM ............................. 39
2.4 EXPERIMENTAL EVALUATIONS AND PRACTICAL ISSUE ......................................... 49
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2.4.1 Experimental Evaluations .......................................................................... 49
2.4.2 Practical issue ........................................................................................... 55
2.5 SUMMARY.......................................................................................................... 60
3 CHAPTER THREE................................................................................................ 61
3.1 INTRODUCTION................................................................................................... 61
3.2 TRADITIONAL CONTROL USED IN MODULE-PARALLELING APPLICATION ................ 62
3.2.1 Single loop Voltage mode Control.............................................................. 62
3.2.2 Peak current mode control ......................................................................... 64
3.3 A NOVEL CURRENT SENSING AND CURRENT SHARING TECHNIQUE ........................ 73
3.3.1 A novel current sensing technique.............................................................. 73
3.3.2 A novel current sharing control technique.................................................. 76
3.3.3 Design and Experimental Results............................................................... 82
3.4 GENERALIZATION AND EXTENSION OF THE NOVEL CURRENT SHARING CONTROL... 90
3.4.1 Generalization of the novel current sharing control technique ................... 90
3.4.2 Extension applications of the novel current sharing control technique ....... 92
3.5 SUMMARY.......................................................................................................... 96
4 CHAPTER FOUR................................................................................................... 97
4.1 INTRODUCTION................................................................................................... 97
4.2 CHALLENGE IN SYNCHRONOUS RECTIFIER BUCKVRM......................................... 99
4.3 DETECT INDUCTOR CURRENTMODE AUTOMATICALLY ....................................... 107
4.4 IMPROVE VRM LIGHT LOAD EFFICIENCY: FIXED FREQUENCY CONTROL.............. 111
4.4.1 Disable synchronous rectifier at light load................................................ 111
4.4.2 With synchronous rectifier at light load.................................................... 115
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4.5 IMPROVE VRM LIGHT LOAD EFFICIENCY: HYBRID MODE CONTROL .................... 126
4.5.1 Disable synchronous rectifier at light load................................................ 126
4.5.2 With synchronous rectifier at light load.................................................... 131
4.6 SUMMARY........................................................................................................ 137
5 CHAPTER FIVE .................................................................................................. 138
5.1 INTRODUCTION................................................................................................. 138
5.2 LIMITATION OF TODAY’S APPROACH ................................................................. 140
5.3 A NOVEL HIGH-INPUT-VOLTAGE VRM ----- PUSH-PULL FORWARD VRM............ 145
5.3.1 Operation of the push-pull forward converter .......................................... 145
5.3.2 ZVS operation.......................................................................................... 152
5.4 COMPARED WITH OTHER TOPOLOGIES ............................................................... 157
5.5 EXPERIMENTAL EVALUATION............................................................................ 163
5.6 A NOVELNON-ISOLATED HIGH -VOLTAGE VRM TOPOLOGY¾IMPROVED CENTER
TAP INDUCTOR STRUCTURE...................................................................................... 178
5.7 SUMMARY........................................................................................................ 184
6 CHAPTER SIX..................................................................................................... 185
6.1 HIGH FREQUENCY OPERATION........................................................................... 185
6.2 ADVANCED POWER DEVICE TECHNOLOGIES ....................................................... 189
6.3 ADVANCED INTEGRATION PACKAGING TECHNOLOGIES ...................................... 192
6.4 ADVANCED HIGH-INPUT-VOLTAGE VRM TOPOLOGIES....................................... 196
6.5 CONCLUSIONS.................................................................................................. 198

rommelhitler

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rommelhitler

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haobx

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hi_china59

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auch0311

谢谢

joshuacp

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smrecnik

Thanks you so much