Upcoming SlideShare
×

Power in space(Wireless Power Transfer)

3,452
-1

Published on

you are worried due to power losses during power trasmission through WIRES.

A new era had begun, where people are going to transfer POWER without any wires in SPACE.
It will change the world into no wires and no batteries.

Published in: Technology
10 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Be the first to comment

Views
Total Views
3,452
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
561
0
Likes
10
Embeds 0
No embeds

No notes for slide

Power in space(Wireless Power Transfer)

1. 1. 1 WIRELESS POWER TRANSMISSION
2. 2.  What is wireless power transmission(WPT)?  Why WPT?  History of WPT  Types of WPT ◦ Techniques to transfer energy wirelessly  Advantages and disadvantages  Applications  Conclusion  References 2
3. 3.  The transmission of power from one place to another without using wires, cables or chords  But, the wireless power transmission is made possible by using various technologies like microwaves, lasers and EM waves 3
4. 4.  As per studies, most electrical energy transfer is through wires.  Most of the energy loss is during transmission • On an average, more than 30% • In India, it exceeds 40% Wireless Power Transmission 4
5. 5. History of WPT: Tesla’s Expt  In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission.  As it is in Radiative mode, most of the Power was wasted and has less efficiency.  The efficient midrange power transfer concept is Witricity. In this model source and load are in Magnetic resonance so there is no power loss.
6. 6. 6 CONCEPT OF ELECTROMAGNETIC WAVE: When an electric current passes through a wire, there is an electric field & magnetic field in the dielectric surrounding the conductor . The electric field of a circuit over which energy flows has three main axes which are mutually perpendicular to each other: a. The magnetic field, concentric with the conductor. b. The lines of electric force, radial to the conductor. c. The power gradient, parallel to the conductor.
7. 7. RESONANCE COUPLING  A group of theoretical physicists at MIT came up with the idea to use resonant induction to transmit power wirelessly led by Dr. Marin Soljacic. “Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied. The Rise Of The Fallen in 2007
8. 8. 8
9. 9.  Reliable  Efficient  Fast  Low maintenance cost  Can be used for short-range or long-range. 9
10. 10. 3/16/2014Wireless Power Transmission 10
11. 11.  The transfer of energy ◦ Magnetic coupling ◦ Inductive coupling  Simplest Wireless Energy coupling is a transformer 11
12. 12. 12
13. 13. 13 Electricity Magnetism Electromagnetism Magnetic Induction Energy/Power Coupling Resonance Resonant Magnetic Coupling
14. 14. 14 Inductive Coupling:  It uses magnetic fields that is produced due to current's movement through- wire. Bending the wire into a coil amplifies the magnetic field. The more loops the coil makes, the bigger the field will be.  This is the principle how a transformer works. Using it an electric toothbrush recharged. It takes three basic steps: 1. Current from the wall outlet flows through a coil inside the charger, creating a magnetic field. In a transformer, this coil is called the primary winding. 2. When you place your toothbrush in the charger, the magnetic field induces a current in another coil, or secondary winding, which connects to the battery. 3. This current recharges the battery.
15. 15. 15 Need of Resonant coupling: Non-resonant coupled inductors(transformers,)work on the principle of inductive coupling is of short range power transfer & requires a magnetic core. Over greater distances the NRI Method is highly inefficient and wastes the majority of the energy in resistive losses of the primary coil. Hence concept of resonant coupling comes where two coils are tuned to a particular frequency called resonating frequency & absorb optimal energy.
16. 16. 3/16/2014Wireless Power Transmission 16
17. 17. 3/16/2014Wireless Power Transmission 17
18. 18. 3/16/2014Wireless Power Transmission 18 Comparison with other technologies: In conventional transformers, for inductive transfer efficiency around 80% at short range  in witricity tightly coupled conventional transformers has efficiency around 90-95% . In addition, where batteries need periodic maintenance and replacement, resonant energy transfer can be used instead. So pollution due to Batteries during their construction and their disposal is largely avoided.
19. 19.  Will it harm me?  Will it harm the environment?  Will it interfere with important communication? NO
20. 20.  No wires  No e-waste  Need for battery is eliminated  Efficient energy transfer  Harmless, if field strengths under safety levels  Maintenance cost is less 20
21. 21.  Distance constraint  Field strengths have to be under safety levels  Initial cost is high  In RIC, tuning is difficult  High frequency signals must be the supply  Air ionization technique is not feasible 21
22. 22. 22
23. 23. 23
24. 24. 24
25. 25.  Transmission without wires- a reality  Efficient  Low maintenance cost. But, high initial cost  Better than conventional wired transfer  Energy crisis can be decreased  Low loss  In near future, world will be completely wireless Wireless Power Transmission 25
26. 26. 26  “Wireless Power Transmission”, Vol No.- 45, Electronics For U –August-2013  Peter Vaessen,” Wireless Power Transmission”, Leonardo Energy, September 2009  C.C. Leung, T.P. Chan, K.C. Lit, K.W. Tam and Lee Yi Chow, “Wireless Power Transmission and Charging Pad”  Wikipedia.  EFY posted articles on WPT.
27. 27. Wireless Power Transmission 27