Wireless power transmission

1. A SEMINAR ON WIRELESS
POWER TRANSMISSION
UNDER THE GUIDANCE OF MADHURI KANJILAL
PRESENTED BY :
ARPAN SAHA
ABHISHEK ADHIKARY
ARNAB ADHIKARI
SUBHAM MITRA
TOUHID ALAM
DEPT: ELECTRICAL ENGINEERING
CAMELLIA SCHOOL OF ENGINEERING AND TECHNOLOGY

2. CONTENTS:
1. INTRODUCTION
2. BACKGROUND
3. INNOVATIONS & EXPERIMENTS CONDUCTED
4. METHODS OF WIRELESS TRANSMISSION
5. ADVANTAGES
6. DISADVANTAGES
7. ISSUES AND FUNDING
8. CONCLUSION
9. A DEMONSTRATION OF WIRELESS POWER TRANSMISSION

3. INTRODUCTION
 As the name suggests wireless power transmission is not a
dream anymore.It will be a reality to transmit electric power
without using any cables or wires in future. Even the most
remote places in the world and most importantly the villages
of India not having any access to electricity and
technology could be benifitted.
 Also the losses of the distribution system would be
significantly reduced which is nearly 27% of the energy
generated.

Microwave Power Transmission is one of the promising
technologies and may be the righteous alternative for
efficient
power transmission.

4. BACKGROUND
Nikola Tesla he is who invented radio and shown us he is indeed
the “Father of Wireless”. Nikola Tesla is the one who first
conceived
the idea Wireless Power Transmission and demonstrated “the
transmission of electrical energy without wires" that depends upon
electrical conductivity as early as 1891[2]. In 1893, Tesla
demonstrated the illumination of vacuum bulbs without using
wires for power transmission at the World Columbian Exposition
in Chicago.

5. INNOVATIONS & EXPERIMENTS CONDUCTED:
 The Wardenclyffe tower shown in Figure 1 was
designed and constructed by Tesla mainly for
wireless
transmission of electrical power rather than
telegraphy
 Experiments in power transmission without
wires in the range of tens of kw have been
performed at Goldstone in California in 1975
and at Grand Bassin on Reunion Island in 1977.
 A physics research group, led by Prof. Marin Soljacic,
at the Massachusetts Institute of technology(MIT)
demonstrated wireless powering of a 60W light bulb
with40% efficiency at a 2m (7ft) distance using two
60cm-diametercoils in 2007 .

6.  Electromagnetic Induction:The electrical transformer is probably
the simplest example of wireless energy transfer. The primary and
secondary circuits of a transformer are electrically isolated from each
other. The transfer of energy takes place by electromagnetic coupling
through a process known as induction.
 Electromagnetic radiation:Electromagnetic radiation in the form of
either radio waves or light can also be used to transfer energy wirelessly.
While systems based upon this method are used mostly for information
transfer, a high degree of efficiency in power transmission is also
achievable under certain circumstances. Efficient power transmission via
radio waves can be achieved by using shorter wavelengths of
electromagnetic radiation, typically in the microwave range. A rectenna may
be used to convert the microwave energy back into electricity.

7.  Evanescent wave coupling :
i. Evanescent wave coupling is a process by which electromagnetic waves are
transmitted from one medium to another by means of the evanescent (or decaying)
electromagnetic field(s).
ii. This is usually accomplished by placing two or more waveguides close together so
that the evanescent field does not decay much in the vicinity of the other
waveguide.
iii. If a proper resonant waveguide is brought near the transmitter, the
evanescent waves can allow the energy to tunnel (specifically
evanescent wave coupling, the electromagnetic equivalent of tunneling)
to the power drawing waveguide, where they can be rectified into DC
power

8.  CCOONNDDUUCCTTIIOONN::
 From experiments performed between 1888 and 1907
Nikola Tesla concluded that the earth is an excellent
electrical conductor, and an electric current can be
made to propagate undiminished for distances of
thousands of miles.

It was also found that the earth’s
natural electrical charge can be made to oscillate, "by
impressing upon it [very low frequency] current waves
of certain lengths, definitely related to its frequency.

9. ADVANTAGES:
• Power Loss iiss vveerryy lleessss aass ccoommppaarreedd ttoo
WWiirreedd EElleeccttrriicciittyy TTrraannssmmiissssiioonn..
• TThheerree iiss nnoo nneeeedd ooff TTrraannssmmiissssiioonn LLiinneess..
• HHeeaalltthh aanndd EEnnvviirroonnmmeennttaall EExxppeerriimmeennttss
ccllaaiimm tthhaatt WWiirreelleessss EElleeccttrriicciittyy TTrraannssmmiissssiioonn
UUssiinngg MMiiccrroowwaavveess aanndd llaasseerr iiss ssaaffee..

10. DISADVANTAGES:
• Would Require aa NNeettwwoorrkk ooff hhuunnddrreeddss ooff
ssaatteelllliitteess..
• TThhee CCoosstt ooff tthhiiss PPrroottoottyyppee PPrroojjeecctt WWiillll BBee
$$7744 BBiilllliioonn aapppprrooxx..
• IInntteerrffeerreennccee wwiitthh ootthheerr EElleeccttrroonniicc DDeevviicceess
wwiillll bbee tthheerree..
• TThhee SSiizzee ooff RReecctteennnnaa wwiillll bbee MMaassssiivvee

11. ISSUES AND FUNDING:
• NNAASSAA:: FFuunnddiinngg TThhee rreesseeaarrcchh,, iinn cchhaarrggee ooff ssppaaccee fflliigghhtt ffoorr
tthhee UUnniitteedd SSttaatteess OOff AAmmeerriiccaa..
NNAASSAA:: WWoouulldd bbee llaauunncchhiinngg tthhee ssaatteelllliitteess aanndd ddooiinngg
MMaaiinntteennaannccee ..
• CoNClUSIoN: MMoorree RReelliiaabbllee TThhaann GGrroouunndd BBaasseedd
SSoollaarr PPoowweerr GGeenneerraattiioonn..
• MMoorree RReelliiaabbllee TThhaann WWiirreedd EElleeccttrriicciittyy TTrraannssmmiissssiioonn..
• IInn OOrrddeerr TToo HHaavvee WWiirreelleessss EElleeccttrriicciittyy TTrraannssmmiissssiioonn TToo
BBeeccoommee aa RReeaalliittyy,, FFoolllloowwiinngg TThhiinnggss HHaavvee TToo HHaappppeenn::
##GGoovveerrnnmmeenntt SSuuppppoorrtt..
##CChheeaappeerr LLaauunncchh PPrriicceess..
##IInnvvoollvveemmeenntt OOff TThhee PPrriivvaattee SSeeccttoorr