This document summarizes a seminar on wireless power transfer systems. It discusses various techniques for wireless power transmission including inductive coupling for short ranges, resonant coupling for medium ranges up to a few meters, power transmission through microwaves, and solar power satellite systems for transmitting power from space to the ground. The history of wireless power transmission is also summarized, including Nikola Tesla's experiments with transferring power through resonant coils in 1899 and more recent MIT experiments achieving 40% efficiency over 2 meters using inductive coils.

1. A
SEMINAR
ON
WIRELESS POWER TRANSFER SYSTEM
Submitted to: Submitted By:
MR. SUNIL GOYAL BALVEER SINGH HADA
H.O.D. FINAL YEAR
ELECTRICAL DEPARTMENT

2. INTRODUCTION
 It is transmission of power without using wires
 In this technique microwaves are used for
transmission of electrical power.
 Power at very high frequency is transmitted
 Efficiency is increased by increasing the frequency

3. Persant Electric system
sourc
e
load
Load
sourc
e
WPT
system

4. HISTORY
In 1899 Nicola Tesla tranfered electrical power through
‘Tesla coils’.
Tesla coil a high mast of 200-ft with a 3 ft-diameter
ball at its top.
He fed 300 kW power to the Tesla coil resonated at 150
kHz. The RF potential at the top sphere reached 100
MV.

5. History contd..
MIT started a
program
“WiTricity” in
which a project was
made.
Energy was
transferred upto 2m
by helical shaped
coils.
Efficiency of this
transmission was
40%.

6. For small range For large rang
Inductive coupling
Resonant coupling
Through microwaves
Solar power satellite
system
Various WPT techniques

7.  Energy is transferred by
mutual induction.
 It’s range is very less.
 Example:
 Brush charging pad ,
transformer etc.
Inductive coupling

8. PROCESS OF INDUCTIVE
COUPLING

9. RESONANT COUPLING
It is
combination of
resonance &
inductive
coupling.
. In resonant
coupling range is
few meters.
In this coupling
circuit is tuned
to mutual
frequency.

10. TRANSMISSION THROUGH MICROWAVE
In 1970 microwaves
were used for
transmission of
power.
The efficiency was
40-50%
It was done from
space to ground by
Japanes scientists in
1987.

11. Block Diagram
Microwave generator transmitter
receiverload
source
medium

12. Need of solar power satellite system
sun sun
Sun
sunsun
SOLAR PLATE

13. Solar power satellite system
Solar power satellites are used
to get solar power more
efficiently.
SPS are placed at
geostationary orbits.
Solar power is captured by
photocells &a satellite may
have 400 million cells.
Energy is send to earth via
microwaves/ LASER.

14. DIFFERENT VIEWS OF SPS

15. Rectenna in US
Rectenna in US receives 5000MW of
power from SPS
It is about one and half mile long
7/10/2014 Wireless Power Transmission 15

16. Environmental
issues
It creates interference with the other
communication system.
This interference can be removed by
increasing frequency band.
It is not harmful for living entities.

17. 
ADVANTAGES
No transmission losses are persant in WPT system which are 30% approx.
Saving of wires & towers cost as no lines are required in this system
It is estimated that before 2030 all transmission in the world will be wireless

18. THANKS TO ALL

19. ?