wirelless charger

1. Submitted to: Submitted by:
Mrs.SHIKHA PANDEY Name
Rollno.
(Department of EC)
DEPARTMENT OF ELECTRONICS & COMMUNICATION
ENGG.
AXIS COLLEGE OF TECHNOLOGY

2. Contents
 INTRODUCTION
 OBJECTIVE
 PRINCIPLE OF OPERATION
 TRANSMITTER
 RECEIVER
 IMPLEMENTAION
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION

3. Introduction
 The mobile can be charged at any time, anywhere automatically
as you talk in your mobile phone!
This technology would eliminate the need for physically
plugging in an Mobile phone.
The microwave signal is transmitted from the transmitter
along with the message signal using special kind of
antennas called slotted wave guide antenna at a frequency
is 2.45 GHz

4. OBJECTIVE
 The main objective of this current proposal is to make
the recharging of Mobile phones independent of their
manufacturer and battery.
 We are going to add just a rectenna & a filter to the
ordinary mobiles during manufacturing time…
 Thus the more you talk, the more is your mobile phone
charged!!!!!!! This is new isn’t?!!

5. MICROWAVE REGION
 Microwave wavelength range approximately from
1mm (thickness of pencil lead) to 30cm (about 12
inches).
 The microwave region in electromagnetic spectrum
ranges from 0.3cm to 300cm.
 Microwave region give the information about the
temperature of the object that emitted microwaves.

6. WHY WIRELESS CHARGING USING MICROWAVES ???
 Microwaves are good for transmitting information from one
place to another ( because it penetrate haze , light rain ,
snow , clouds etc…).
 It has shorter wavelength than remote sensing.
 Microwave radiation are considered harmless except for
people with pace makers.

7. Principle of Operation &
Block Diagram
Transmitting station with
the microwave
transmitter
sensor
Rectenna
RF cable
circulator
waveguide
Slotted waveguide
Antenna
mobile signal
 The microwave signal is transmitted along with message
signal using slotted wave guide antenna.
 The sensor search for the mobile signal , in addition it has
a “RECTENNA”.
 Rectenna receives the transmitted power and converts the
microwave power to DC power.

8. TRANSMITTER
 The MAGNETRON is a self-contained microwave
oscillator.
 Cross field and magnetic field are used to produce high-
power output .
 Efficiency of this high power oscillator lies between
50% and 80%.
Electron beam
Energy
Microwave
Energy
Cross Field Device

9. Slotted waveguide antenna
 It is used as ideal power transmitter
(because of its high aperture efficiency
>95%) .
 It has high power handling capacity .
 It has 64 slots of power uniformly
through free space to the rectenna.

10. Receiver Design
Rectenna:-
Microwave
Energy
DC Energy

11. The microwave signal is transmitted along
with message signal using slotted wave guide
antenna.
The sensor search for the mobile signal , in
addition it has a “RECTENNA”.
It comprises of a dipoles and Schottky barrier
diodes Usually its elements are arranged in the
mesh pattern.
How Receiver Works ?

12. SCHOTTKY
 • A Schottky barrier diode is formed by connecting
a metal with a semiconductor.
 •The semiconductor material is chosen from
different metals such as molybdenum, chromium,
platinum and tungsten.
 •This diode does not has minority carriers, its speed
is much faster, so its reverse recovery time(Trr) is
very short and shorter than 10 ns.

13. What is RECTENNA and how it helps?
 Its nothing but the combination of
rectifier and antenna..
 Antenna is to receive the microwave
signal and it just feed the signal to
rectifier .
 Rectifier is to convert the microwave
energy to electricity.

14. •SENSOR
 The operating frequency of the mobile phone is 900MHz or
1800MHz for communication.
 LM2907-a simple n F to V converter used as it operates
between this specified range .
 To trigger the rectenna circuit to ON and the mobile begins
to charge using the microwave power automatically.
 This is required, as the phone has to be charged as long as the
user is talking.

15. Implementation
 NOKIA has launched this wireless charging technology in its new mobile model “
NOKIA LUMIA 1020”.
 Energy efficient chargers of all size and shape to match our phone.
 They are all quiet compactable , which means we can use any chargers as we like.

16. Advantages
The need of different types of chargers by different
manufacturers is totally eliminated
Lower risk of ELECTRICAL SHOCK or shorting.
Convenience.
The more you talk the more you get charged.
Wireless energy transfers can potentially recharge the
mobile phones without chords.

17. Disadvantages
Wireless transmission of the energy causes some
drastic effects to human body, because of its
radiation
Process is of high cost.
Network traffic may cause problem in charging.
Rate of charging is of minute range .
Charging depends on network coverage.

18. FUTURE SCOPE
In future RECTENNA is used to produce large-scale
power from microwaves beam .
This technology is also applicable for electronic
gadgets which work on batteries and thus saves
electricity.
Currently researches are going on, to implement this
technology for laptops.

19. CONCLUSION
 A novel use of RECTENNA and a SENSOR in
mobile phone could provide a new dimension in
the revelation of mobile phones.
 Thus a great advantage is to carry their mobile
phones to any place is devoid of facilities for
charging.

20. REFERENCE
 Theoretical and experimental development of 10
and 35 GHz rectennas “IEEE Transactions on
Microwave Theory and Techniques”, vol. 40, no. 6,
June 1992
 Theodore.S.Rappaport , “Wireless Communications
Principles and Practice”.