Inductive Powering (eBook)

Preface 6
Symbols and units 8
Table of contents 13
1 An introduction on telementry 17
1.1 WIRELESS CONNECTIONS 18
1.2 HOW TO CHOOSE BETWEEN LINK TYPES? 36
1.3 CONCLUSIONS 49
1.4 REFERENCES 49
2 The concepts of inductive powering 56
2.1 INDUCTION THEORY 57
2.2 INDUCTIVE POWERING 62
2.3 THE DRIVEN INDUCTIVE LINK 67
2.4 LINK OPTIMISATION 82
2.5 DISCUSSION: OPTIMISATION OF WEAKLY COUPLED LINKS 86
2.6 CONCLUSIONS 89
2.7 REFERENCES 89
3 Exact link formulae 92
3.1 INDUCTIVE LINKS WITH A PARALLEL-RESONANT SECONDARY 94
3.2 INDUCTIVE LINKS WITH A SERIESRESONANT SECONDARY 107
3.3 CONCLUSIONS 115
3.4 REFERENCES 116
4 Primary coil drivers 117
4.1 CLASS C 120
4.2 MODELLING OF SWITCH TRANSISTORS 124
4.3 CLASS D 126
4.4 THE IMPORTANCE OF SUPPLY DECOUPLING 131
4.5 IDEAL ACTIVE-DEVICE BEHAVIOUR 132
4.6 SATURATING CLASS C 134
4.7 CLASS E 141
4.8 CLASS E WITH 1 COIL AND 1 CAPACITOR 150
4.9 DRIVING WEAKLY COUPLED LINKS 151
4.10 CONCLUSIONS 153
4.11 REFERENCES 155
5 Optimisation of the driven inductive link 158
5.1 OPTIMISATION OF THE DRIVEN LINK 159
5.2 THE OPTIMISATION STRATEGY 165
5.3 DESIGN EXAMPLE 175
5.4 CONCLUSIONS 179
5.5 REFERENCES 180
6 Automatic link tuning 182
6.1 AUTOMATIC SEARCH OF THE TRANSFER FREQUENCY AND AUTO-REGULATION OF THE DRIVER POWER 183
6.2 SWITCH-MODE COIL DRIVER WITH LOAD-RESONANCE CONTROL 186
6.3 PROTOTYPE RESULTS AND DISCUSSION 188
6.4 REFERENCES 190
A1 Vector Formulae 191
A2 Coil models and measurements 193
A3 Saturating-class-C amplifiers 206
Index 229