Contents wpt

1. CONTENTS
CERTIFICATE………………………………………………………………….…...ii
ACKNOWLEDGEMENT……………………………………………………….......iii
ABSTRACT…………………………………………………………………...….…iv
LIST OF FIGURES………………………………………………………………....vii
CHAPTER 1: WIRELESS POWER TRANSMISSION……………………...…1-8
1.1 Introduction ……………………………………………………..…………1
1.2 Why do we go for wireless power transmission (WPT) system ……………1
1.2.1 Losses in the wired system ………..………………………...……....1
1.3 Historical revolution of Wireless Power Transmission …….………....…….3
1.4 What is WPT ……………………………………………………………..…6
1.5 How does wireless power work? ……………………………………............7
1.6 Need of WPT ………………………………………………………….….....7
CHAPTER 2: IDEA OF TRANSFORMING ELECTRICITY TO WPT……....9-12
2.1 Electricity ………………………………………………...……...……….…..9
2.2 Magnetism ……………………………………………......…..........................9
2.3 Electromagnetism ………………………………………...........……………..9
2.4 Magnetic induction………………..............................................………...….10
2.5 Energy/power coupling …………...……………………...........…………….10
2.6 WPT technology …………………………………………......……………...11
CHAPTER 3: THEORIES ON WPT …………………….……..…………….....13-23
3.1 Near field theory ………………………………………..........…………......13
3.1.1 Electrical conduction principle ……………………….....…….……...13
3.1.2 Induction principle (non resonant energy transfer) ..………................15
3.1.3 Electrostatic induction principle ……………….....…………….……16
3.1.4 Electro-dynamic induction ……………………......………..…….…..17
3.1.5 Experimental demonstration of evanescent coupling at MIT...............18
3.2 Far Field Theory ……………………………………..………………….…18
3.2.1 Microwave Power Transmission (MPT) ……………...…..…….…19
3.2.2 Applications ………………………………………….........…….…20
3.2.2.1 WTP for space solar ………………………………………...20
3.2.2.2 Power transfer bridging ………………………………......…21
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2. 3.2.3 Safety issues ………………………………………….….............22
CHAPTER 4: TRANSMITTERS AND RECIEVERS …………………..…..24-27
4.1 Antennas for Microwave Power Transmission ………..………...…........24
4.2 Recent technologies for transmitters ……………………..………..….....24
4.2.1 Magnetron …………………………………………..….............25
4.2.2 Semiconductor amplifier ……………………...……………,,…25
4.3 Wireless Power Transmission – Receivers and Rectifiers …….…….......26
4.3.1 Recent technologies of Rectenna ……………..………..…..……26
4.3.2 Recent technologies of Rectenna array………………......………26
4.3.3 Efficiency ………………………...……………………......…….26
4.3.3.1 RF DC conversion efficiency ...……….…........………...27
4.3.3.2 Beam collection efficiency ……………....……....…..….27
CHAPTER 5: RECENT TECHNOLOGICAL TRENDS.…………...……...28-29
5.1 Retro directive beam control………………….………….................……28
5.2 Environmental issues …………………….………….………………......28
5.3 Interaction with Atmosphere ……………..…….……….............,.....…..28
5.4 Interaction with Space Plasmas ...……….....…………….………,,….....29
CHAPTER 6: APPLICATIONS, ADVANTAGES AND FUTURE……......30-33
6.1 Applications ……………………………………………………….…..30
6.1.1 Automatic wireless power charging ………………….…......,....30
6.1.2 Consumer electronics …………………………………….........30
6.1.3 Industrial……………………………………..…………….........30
6.1.4 Transportation ………………………….…...………...…….…..31
6.2 Other applications ……………………………….……………...……...31
6.3 Advantages and disadvantages …………………………………..….....31
6.4 Safety and Future scope …………………………………………...…....32
6.4.1 Is WPT technology safe? ………………………...………….…...32
6.4.2 Future scope of WPT ……………………………..……….....…..33
CONCLUSION ……………………………………………………………..…34
REFRENCES ………………………………………………….…………........35
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