The document discusses various techniques for wireless transmission of energy including near field techniques like inductive coupling and resonant inductive coupling, and far field techniques like laser power transmission, microwave power transmission, and solar power satellites. It provides details on how inductive coupling, resonant inductive coupling, microwave power transmission, and solar power satellites work. The document also discusses advantages and disadvantages of near field and far field techniques as well as applications of wireless power transmission including electric vehicle charging, consumer electronics, and industrial uses.

2. SUBMITTED TO:-Mr Ram Bhagat ,Assistant professor(Dept of Electrical Engineering)

3. The transmission of energy from one place to another without using wires
 Conventional energy transfer is using wires ,which results in large Copper
loss.
 But, the wireless transmission is made possible by using various
technologies based on Resonant frequency ,Inductive coupling etc.

5.  Near Field Techniques
 Inductive Coupling
 Resonant Inductive Coupling
 Far Field Techniques
 Laser power Transmission
 Microwave Power Transmission
 Solar power Satellite(SPS)

6. INDUCTIVE COUPLING
It is based on the FARADAY’S LAW OF
ELECTROMAGNETIC INDUCTION
Make use of coils. The coils are not connected
through wire or any other kind of material.
Transfer of energy is due to mutual induction.
Its based on the concept :- that an oscillating
electric field produces magnetic field and an
oscillating magnetic field produces oscillating
electric field

7. Same inductive coupling(EMI) concept but
the coils here operate at their resonating
frequency.
Inductance induces current.
Resonance makes both the coil to operate at
same frequency.
Fields are non-radiative in nature.

8. RIC is highly efficient
RIC has much greater range than inductive coupling
RIC is directional when compared to inductive coupling
RIC can be one-to-many. but usually inductive coupling is
one-to-one
Devices using RIC technique are highly portable

9. ADVANTAGES OF NEAR FIELD TECHNOLOGY
 For short range transmission
 Aims low power transmission
 Need for battery is eliminated
 Efficient energy transfer using RIC
 Harmless, if field strengths under safety levels
 Maintenance cost is less

10. DISADVANTAGES OF NEAR FIELD TECHNOLOGY
 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

11. APPLICATION OF NEAR FIELD
TECHNNOLOGY
 Electric automobile charging
 Consumer electronics
 Industrial purposes
 Sharing information

12. FAR FIELD ENERGY TRANSMISSION
 Aims high power transmission
 For long range of transmission
 Require line of sight
 Radiative in nature

13.  Microwave Power Transmission (MPT)
 LASER Power Transmission
 Solar power Satellite(SPS)

14. MICROWAVE POWER TRANSMISSION (MPT)
Transfers high power from one place to another.
 Two places being in line of sight usually.
Electrical energy converted to microwave energy
using magnetron.
Capturing microwave using retina.
Conversion of microwave energy into electrical
energy.
Transmission of electrical energy.

15. LASER POWER TRANSMISSION
LASER is highly directional and coherent
But, gets attenuated when it propagates
through atmosphere
Simple receiver
Photovoltaic cell
Cost-efficient

16.  Satellites are placed in geostationary orbit
 Solar energy is captured using photocells
 Each SPS may have 400 million photocells
 Transmitted to earth in the form of
microwaves/LASER
 Using rectenna/photovoltaic cell, the energy
is converted to electrical energy
 Efficiency exceeds 95% if microwave is used.

17. ADVANTAGE OF FAR FIELD TECHNIQUE
 Efficient,Easy
 Need for grids, substations etc are eliminated
 More effective when the transmitting and receiving points are along a line-of-
sight

18. DISADVANTAGES
 Needs line-of-sight
 Initial cost is high
 When LASERs are used,
 conversion is inefficient
 Absorption loss is high
 When microwaves are used,
 interference may arise
 Needs positioning and GPS systems.

19. WITRICITY
Transmission of electrical energy from one object to another without the use of
wires is called as WiTricity.
 Wireless transmission is useful in cases where interconnecting wires are
inconvenient, hazardous, or impossible.
HOW WITRICITY WORK???
 Near-field inductive coupling through magnetic fields
 It makes use of resonating frequency to transmit energy.

20. THE FORGOTTEN INVENTION IS REBORN IN 2007
In 2007,6 MIT members headed by Marin Soljacic were able to successfully transmit power to a bulb within a
distance of 2m at a frequency of 9.9MHz using concepts of non radiative mid range energy transfer.
Resonance
inductive coupling
Efficiency at that point was just approximately 43%

21.  To fulfil the ever increasing demand of nation.
 It is efficient and reliable.
 Its application are eco-friendly.
 Safe for humans.
 Low maintenance cost.
 Fast
 Can be used for short-range and long-range transmission.
 Wireless technology is a non-radiative mode of energy transfer, relying
instead on the magnetic near field.

22. WHY WIRELESS OR WHY NOT WIRES ?
 Conventional medium of transferring electrical energy is wires.
 So most of losses occurs during transmission.
 Globally on an average about 30%.
 In India its about 40% or more.
 Billions, trillions of $ is spend on wires and in their installation.
 Waste management a challenge in 21 century.
 40 billion disposal batteries added to e-waste every year.
 PVC is non-biodegradable.

23. NETWORK OF WIRES ON ELECTRIC
POLES IN DARYAGANJ, NEW DELHI

24. RESONANCE INDUCTIVE COUPLING
 Two objects having same resonating frequency
and in Magnetic resonance at Strongly coupled
regime tend to exchange energy , while
dissipating relatively little energy to the
extraneous off-resonant objects.
 The equipment used is sometimes called
a resonant or resonance transformer.

26. APPLICATION
 Automatic Wireless Power Charging :-
When all the power a device needs is provided wirelessly, and no batteries are required.
This mode is for a device that is always used within range of its WiTricity power source.
When a device with rechargeable batteries charges itself while still in use or at rest,
without requiring a power cord or battery replacement. This mode is for a mobile device
that may be used both in and out of range of its WiTricity power source.
 Consumer Electronics
 Automatic wireless charging of phones, laptops, game controllers in home, car, office,
Wi-Fi hotspots.
 Direct wireless powering of stationary devices like flat screen TV's, digital picture
frames, home theatre accessories, wireless loud speakers etc ,eliminating expensive
custom wiring, unsightly cables and "wall-wart" power supplies.
 Direct wireless powering of desktop PC peripherals: wireless mouse, keyboard,
printer, speakers, display, etc. eliminating disposable batteries and awkward cabling.

27. Industrial
 Direct wireless power and communication interconnections across rotating
and moving "joints" (robots, packaging machinery, assembly machinery,
machine tools) . eliminating costly and failure-prone wiring.
 Direct wireless power and communication interconnections at points of use
in harsh environments (drilling, mining, underwater, etc.) ... where it is
impractical or impossible to run wires.
 Direct wireless power for wireless sensors and actuators, eliminating the
need for expensive power wiring or battery replacement and disposal..

28.  Transportation:-
 Automatic wireless charging for existing electric vehicle classes: golf carts,
industrial vehicles.
 Automatic wireless charging for future hybrid and all-electric passenger and
commercial vehicles, at home, in parking garages, at fleet depots.

29. MAY BE IN FUTURE