Wireless power transmission Its types Its applications

1. WIRELESS POWER
TRANSMISSION
By:
Hafiz Hussain(2012119)
Hassan Raza(2012143)
Junaid Ahmad(2012159)
Khawaja Zain(2012161)

2. Introduction
Transmission and distribution losses
Loss of energy generated in wires
Nicola Tesla

3. History of Wireless Power
In 1899, Sir Nikola Tesla Proposed a
method of Wireless Power Transmission.
He enlighted 200 lamps at the distance of 40
km, Wirelessly !
Nikola Tesla – The Genius
Colorado springs experiment

4. Earth current transmission
Wireless Tower
Charged by high frequency and high voltage apparatus
High frequency AC Current discharged
Conduction, Earth surface shell
Tesla Coil
Electrical resonant transformer circuit
High frequency output illuminates fluorescent tubes

5. The forgotten invention is reborn in 2007
RESONANCE COUPLING
 A group of engineers at MIT came up with the idea to use resonant induction to transmit
power wirelessly.
“Resonance", a phenomenon that causes an object to vibrate when energy of a certain
frequency is applied.

6. Experiment demonstrated at MIT.
A 60W light bulb lit from source at a distance of 2m from load.

7. What is WPT ?
definition is :
 “Transmission of energy through the air”.
 A system of two electromagnetic resonators
coupled mostly through their magnetic fields.

8. Types of WPT
Near-field techniques
Inductive Coupling
Resonant Inductive Coupling
Air Ionization
Far-field techniques
Microwave Power Transmission (MPT)
LASER power transmission
8

9. Inductive coupling
Primary and secondary coils- not connected
with wires.
Energy transfer - due to Mutual Induction.
9

10. Resonance Inductive Coupling(RIC)
Same concept as Inductive coupling just that the coils
operate at resonant frequency leading to efficient
transfer of energy over a larger distance.
 Interacts weakly with extraneous off resonant objects.
Radiation loss will be negligible

11. 11

12. Resonant Inductive Coupling

13. Air Ionization
Toughest technique under near-field energy transfer
techniques
Air ionizes only when there is a high field
Needed field is 2.11MV/m
Natural example: Lightening
Not feasible for practical
implementation.

14. Microwave Power Transmission
(MPT)
 SPS Idea proposed by Petel Glaser in 1968
 Satellite in Geosynchronous Orbit

15. Microwave Power Transmission
(MPT)
Microwaves produced at 2.45 GHz by using Magnetron
Rectenna is used for collecting these Microwaves (One and
half mile long)
 Rectenna converted these Microwaves in DC power with
antenna and rectifier
Through this type of Power Station, we can get 5 to 10 G-Watts
power.
Power efficiency up to 85%.

16. 5,000 MW Receiving Station (Rectenna). This station is
about a mile and a half long.

17. Laser Power Transmission
 Energy conversion –solar energy to concentrated light
energy – electrical energy.

18. Laser Power Transmission
Long distance transmission possible.
Solar energy- Not a concentrated source of energy.
Losses due to scattering of light.
Presently only 3% of solar energy is being utilized.
High efficiency about 50% to 75%.
With this technology it is expected 1GW of power can be
generated.

19. 19
Applications
In Electric Automobiles

20. Applications
 Direct Wireless Power
 No device needs wires
 For TVs, toasters or any form of
Immobile devices

Automatic Wireless Charging Pad
 Device with rechargeable batteries
 charges itself
 Criteria: Close Contact

21. WPT CONCERNS
Will it harm me?
Will it harm the environment?
NO

22.  No wires
 No Energy-waste as compared to dumped used batteries
 Need for battery is eliminated
Maintenance cost is less
22
Advantages of WPT

23. Distance constraint
23
Disadvantages

24. Initial cost is high
In RIC, tuning is difficult(L & C Values for Resonance)
Air ionization technique is not feasible( small distance,
High voltage, )
24
Disadvantages

25. CONCLUSION
Transmission without wires- a reality
Efficient (MIT experiment more than 60%)
Energy crisis can be decreased
In near future, world will be completely wireless