3. • The transmission of energy from one place to ano
without using wires.
• Conventional energy transfer is
using wires
• But, the wireless transmission is made possible by
various technologies…..
4. • Nikola Tesla in late 1890s
• Pioneer of induction techniques
• His vision for “World Wireless System”
• The 187 feet tall tower to broadcast energy
• All people can have access to free energy
• Due to shortage of funds, tower did not
operate
5. Tesla was able to transfer energy from
one coil to another coil
He managed to light 200 lamps from a
distance of 40km
The idea of Tesla is taken in to research after 1
by a team led by Marin Soljačić from MIT. T
is named as ‘WiTricity’.
6. i. As per studies, most electrical energy transfe
through wires.
ii. Most of the energy loss is during transmission
iii. On an average, more than 30%
iv. In India, it exceeds 40%
8. • Human beings or other objects placed between th
transmitter and receiver do not hinder the trans
of power.
• Magnetic field tend to interact very weakly with
biological tissues of the body, and so are not p
cause any damage to any living being.
9. There are mainly 3 major types of wireless energy transfe
Short range – INDUCTIVE COUPLING
Medium range – RESONANT INDUCTION
Long range
power transfer – ELECTROMEGNETIC WAVE
10. 1) Ground based power transmission
2) Space based power transmission
11. But Space-based power transmission is preferred
based power transmission
Ground is (obviously) cheaper per noontime watt, but:
· Space gets full power 24 hours a day
– 3X or more Watt-hours per day per peak watt
– No storage required for nighttime power
· Space gets full power 7 days a week – no cloudy days
· Space gets full power 52 weeks a year
– No long winter nights, no storms, no cloudy seasons
· Space delivers power where it’s needed
– Best ground solar sites (deserts) are rarely near users
· Space takes up less, well, space
– Rectennas are 1/3 to 1/10 the area of ground arrays
– Rectennas can share land with farming or other uses.
12. Solar Power Satellites (SPS) have proposed to collect sola
energy in space and beam it down to the Earth.
13. • There is no air in space, so the satellites would receive somewhat more intense sunlight,
unaffected by weather.
• The SPS concept is simpler than most power systems here on earth.
• Solar radiation can be more efficiently collected in space, where it is roughly three
times stronger than on the surface of the Earth and it can be collected 24 hours per day
(since there are no clouds or night in high Earth orbit).
• SPS does not use up valuable surface area on the Earth
14. Four basic steps involved in the conversion of solar energy
electricity and delivery are:
Capture solar energy in space and
convert it to electricity
Transform the electricity to radio
frequency energy and transmit it to Earth
Receive the radio frequency energy on Earth and
convert it back to electricity
Provide the electricity to the utility grid
21. • Microwave Transmitting Satellites
about 35,000 km above Earth’s surface.
microwave transmitting satellites are massive,
the solar reflectors spanning up to 3 km and weighing over
80,000 metric tons.
capable of generating multiple gigawatts of power, enough to
power a major U.S. city.
22. Unlimited energy resource
Energy delivered anywhere in the world
Zero fuel cost
Zero CO2 emission
Minimum long-range environmental impact
Solar radiation can be more efficiently collected i
23. Launch costs
Capital cost even given cheap launchers
Would require a network of hundreds of satellites
Possible health hazards
The size of the antennas and rectennas
Geosynchronous satellites would take up large sections of
Interference with communication satellites
