Modeling, Design and Simulation of Digitally Controlled DC/DC Converter

kevinwjs

CHAPTER 1INTRODUCTION........................................................................................................................1
1.1 WHAT IS DIGITALPOWER?.................................................................................................................1
1.2 GENERAL DIGITAL CONTROLLER ARCHITECTURE............................................................................3
1.3 TAKE ADVANTAGE OF DIGITAL CONTROL .........................................................................................5
1.3.1 Control core...................................................................................................................................5
1.3.2 Control periphiral...........................................................................................................................7
1.4 THESISOVERVIEW.............................................................................................................................9
CHAPTER 2 VOLTAGE MODE VERSUS CURRENT MODE...................................................................11
2.1 MODULATOR INSTABILITYEXAMPLES.............................................................................................11
2.2 MULTI-FREQUENCY SMALL SIGNAL MODEL....................................................................................14
2.3 A NEW MODULATION PERSPECTIVE.................................................................................................17
2.4 PROOF OF THE MODULATION STABILITY.........................................................................................21
2.5 CONCLUSIONS ON THEMODULATOR................................................................................................25
2.6 DIGITAL MODULATION.....................................................................................................................27
CHAPTER 3 DISCRETE MODEL AND CONTROL....................................................................................29
3.1 DESIGN BY EMULATION....................................................................................................................29
3.2 DIRECT DIGITAL DESIGN..................................................................................................................30
3.3 DISCRETE MODELING.......................................................................................................................31
3.4 NOTES ON DESIGNIMPLEMENTATION..............................................................................................33
CHAPTER 4 MIXED SIGNAL VERIFICATION AND EXPERIMENTS ..................................................35
4.1 BOTTOM-UP DESIGN........................................................................................................................36
4.2 MOVING TO TOP-DOWN DESIGN.....................................................................................................37
4.3 DIGITALLY CONTROLLED POWER CONVERTER MIXED MODE SIMULATION STEPS ........................37
4.3.1 Verilogentry................................................................................................................................38
4.3.2 Verilog-Aentry............................................................................................................................41
4.3.3 UsingModelwriter.......................................................................................................................45
4.3.4 SchematicEntry...........................................................................................................................47
4.3.5 Starting the simulation setup........................................................................................................51
4.3.6 Defining D/A and A/D conversion information ...........................................................................52
4.3.7 Debugging simulation and verifivation........................................................................................54
4.4 DESIGN, SIMULATION AND EXPERIMENTAL EXAMPLE ....................................................................55
CHAPTER 5 LOW COST DIGITAL IMPLEMENTATION AND OTHER FUTURE WORKS .............61
5.1 ONLINE DOUBLE POLE FREQUENCY DETECTION ...........................................................................61
5.1.1 Double pole freqeuncy detection method.....................................................................................62
5.1.2 voltage level definitions and operation sequence.........................................................................65
5.1.3 Windowed flash ADC..................................................................................................................67
5.1.4 Low power design........................................................................................................................69
5.2 FUTURE WORK FOR ONLINE DETECTION METHOD ..........................................................................73
5.3 DISCRETE OGY METHOD GOOD FOR DIGITAL IMPLEMENTAION ...................................................75
CHAPTER 6 CONCLUSIONS.........................................................................................................................80

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