1. WIRELESS ELECTRICITY
Presenting by
Sachin Karkera
Dept. of E&E MITK

2. OVERVIEW
 History
 Introduction
 Definition
 Fundamental working principle
 Types of techniques
 Recent technologies
 Applications
 Advantages
 Limitations
 References

3. HISTORY
 1899:The founder of AC electricity, Nikola Tesla,
was first to conduct experiments dealing with
WPT.
 1939-45:World War II developed ability to
convert energy to microwaves using a
magnetron.
 1961:Willam C. Brown publishes an article
exploring possibilities of microwave
transmission.
 1968:Idea for Solar Power Satellites, Would use
microwaves to transmit power to Earth from
Solar Powered Satellites.
 2009:Sony shows a wireless electrodynamics
induction powered TV set, 60W over 50cm.

4. INTRODUCTION
 Electrical energy need to be transported to the
distribution lines through cords.
 One of the major issues in power transmission is the
losses that occur during transmission and distribution
process of electrical power
 In order to minimize power losses in the power
distribution network, we should develop some
alternatives to minimize the power dissipation.
 Now-a-days there is a rapid increase of electronic
goods , which dependent on the chemical storage of
energy by the battery which need to be recharged
frequently.

5. DEFINITIONS
 As the word itself means “without wires”.
 Wireless electricity is the transfer of power to a
device over the air.
 Also known as wireless power transmission,
inductive power transfer, can be used for short
range or even long range without cords.

6. FUNDAMENTAL WORKING PRINCIPLE
 It works on the principle of “mutual induction” between the two
coils.
 In general there are two copper coils arranged one at the sender
end and other at the receiver end .The first coil is attached to the
power source while the second coil to the light bulb.
 When the power is switched on the first coil converts the
electricity into magnetic field ,which is oscillating at a particular
frequency i.e , AC source.
 The second coil at the receiver end converts the magnetic field
into electricity .The surrounding environment is unaffected.

7. TECHNIQUES
 Near-field techniques
The near-field techniques are measuring with
appliance near from the power source.
 Far-field techniques
The far-field techniques are measuring the
electrical load far from the power source.

8. Near-field techniques:
 Inductive coupling
 Magnetic resonant coupling

9. Far-field techniques:
 Microwave power transmission
 Laser power transmission

11. RECENT TECHNOLOGIES
 Qi technology
 This technology uses the small inductors to transmit
power over high frequency, and also supports charging
distance of few cm at most.
 Alliance for wireless power
(A4WP)technology
 It provides larger area for magnetic field, allows single
transmitter to charge multiple devices.
 Power matter alliance (PMA)technology
 Better power model for battery equipped devices using
wireless charging method.

12. WHERE IT WILL BE USED?
o Cell Phones
o TVs
o Computers
o Electric Cars
o Cordless Tools
o Industrial Machinery
o Medical Devices (pacemakers, etc.)
o Military Devices (unmanned robots, planes)
o Consumer Appliances
o ANYTHING ELECTRIC!

13. ADVANTAGES
 Wireless Power Transmission system would completely
eliminates the existing high-tension power transmission
line cables, towers and sub stations between the
generating station and consumers .
 So no transmission and distribution losses.
 We can produce electricity anywhere without wires.
 The power can be delivered in any direction i.e.,
omnidirectional.
 No need for meter rooms and electrical closets.
 Reduction of e-waste by eliminating the need for power
cords.
 Need more light in your office, no need for electrician.
Simply place the lamp where ever you need it.

14. LIMITATIONS
 The Capital Cost for practical
implementation of
WPT seems to be very high.
 The flux condition should
satisfy certain conditions ,
if not no power supply takes
place.
 There is a loss of power transmission
if there is a strong Ferro- magnetic substance.

15. THANK YOU
Any questions?