Chapter One
Introduction 1
Chapter Two
2 Theoretical background 2
2.1 History of Wireless Power Transfer 2
2.2 Main concepts of wireless transmission of electric energy 3
2.3 Physics behind inductive coupling WPT 6
2.4 Health and safety considerations 11
2.5 Main WPT interface standards and alliances 12
2.5.1 Qi by the Wireless Power Consortium (WPC) 13
2.5.2 Rezence by the Alliance for Wireless Power (A4WP) 13
2.5.3 Power Matters Alliance (PMA) 13
2.6 Wireless power market overview 14
Chapter Three
Methods and materials 19
3.1 Texas Instruments Qi compliant modules evaluation 19
3.2 NextFloor custom 40W WPT system 23
3.3 PCB schematic design 24
3.3.1 Transmitter schematic 24
3.3.2 Receiver schematic 28
3.4 PCB layout design 34
Chapter Four
Results and discussion 38
4.1 Tests and measurements 38
4.1.1 Efficiency evaluation 39
4.1.2 EMF test 42
4.1.3 EMC scan 42
4.2 Development of the NextFloor WPT prototypes 47
4.2.1 NextFloor + WPT concept 47
4.2.2 Qi-compatible demo-table 49
4.2.3 Non-standardized 40W WPT floor-demo 51
5 Conclusions 53
References
