PPT on Wireless charging of mobile using microwaves

 INTRODUCTION
 WHAT’S HAPPENING
 MICROWAVE REGION
 FREQUENCY SELECTION
 BLOCK DIAGRAM
 TRANSMITTER SECTION
 RECEIVER SECTION
 ADVANTAGES
 DISADVANTAGES
 APPLICATION
 CONCLUSION
2

 Mobile phones becoming basic part of life
 Recharging of mobile phones is a big problem
 Objective—to recharge any mobile phone independent of
manufacturer and battery make
 Achieved by recharging battery while talking using
microwaves
3

 More you talk more the mobile get charged!
 No separate mobile charger
 Additives to mobile handsets:
Sensor
Rectenna
4

 Microwave signal is transmitted from transmitter along with
message signal using slotted waveguide antenna at frequency
2.45 GHz
 Charging made universal
5

 Wavelength : 1 mm-30 cm
 Microwave can be used for:
1. Measuring body temperature
2. Transmitting information
3. Remote sensing
4. RADAR
5. Communication
7

 We choose s –band of microwave region(2-4GHz)
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Designation Frequency range
L Band 1 to 2 GHz
S Band 2 to 4 GHz
C Band 4 to 8 GHz
X Band 8 to 12 GHz
Ku Band 12 to 18 GHz
K Band 18 to 26 GHz
Ka Band 26 to 40 GHz
Q Band 30 to 50 GHz
U Band 40 to 60 GHz

 Select license free 2.45 GHz Industrial, Scientific and
Medical (ISM) radio bands
 ISM bands are reserved internationally for non-commercial
use of RF electromagnetic fields for industrial, scientific and
medical purpose
9

 Transmitter has two sections:
◦ Magnetron
◦ Slotted waveguide antenna
11

• Magnetron is a vacuum tube oscillator that generates high-
power electromagnetic signals in the microwave frequency
range.
12

 It is a microwave tube in which electrons generated from a heated
cathode are affected by magnetic and electric fields to produce
microwave radiation
 Magnetron is used to produce high-power output required in radar
and communication equipment
13

 It is an Omni-directional antenna
15

 Slotted antenna arrays used with waveguides are popular
antenna in navigation, radar and other high-frequency systems
 Has high efficiency and gain of 13dB
 Here we use frequency of 2.45GHz
16

17
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.

 Basic additions to mobile phone
a. Rectenna
b. Sensory Circuit
18

What’s rectanna you are confused…….it’s 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 AC signal to PULSATING DC
signal.
19
Rectenna = Rectifier + Antenna.

 Rectenna is a rectifying circuit that converts microwave
energy into DC output.
 Single Rectenna is approx 23 mm2 , arranged to form an array
suitable to the shape of mobile phone.
 Very thin as sheets and can be used at the back of the Cell
phones
 In our design it consists of a single diode power rectifier in
“hybrid technology” with improved sensitivity at low power
levels.
20

 The Schottky diode microwave rectifying circuit is used
here as its efficiency is found to be greater than 90%.
 To make low cost power rectifier for low and high power
levels of 2.45GHz with good efficiency of rectifying operation
 Used to improve transmission efficiency
21

 Directly converts the microwave signal into DC power.
 The efficiency is up to 90% in laboratory environments
 Comprises of a dipoles and diodes.
 Usually its elements are arranged in the mesh pattern
22

 A Schottky barrier diode -- majority carrier device
 Common diode -- minority carrier device.
 Its reverse recovery time Trr is very short and shorter than
10 nS.
 The forward voltage bias of the Schottky barrier diode is
under 0.6V.
 This is a comparatively ideal diode, such as for a 1 ampere
limit current PN interface.
23

 Simple circuit which detects whether the user is making a call
 Simple F to V converter, this would serve our purpose
 Operating frequency of mobile phone operators for GSM
system for mobile communication in India is 900MHz or
1800MHz
 Simple yet powerful F to V converter is LM2907
24

 On the reception of the microwave signal ,the sensor circuitry
directs rectenna circuit to ON
 Rectenna circuit converts microwave energy to dc output
 Mobile phone begins to charge using the microwave power as
long as the user talks over cell phone.
26

 Charging mobiles wirelessly
 Saving time for charging
 Wastage of power is less
 Better than witricity
 Get charged as we make call during long journey
27

 Radiation problems may occur
 Network traffic may cause problems in charging
 Charging depends on network coverage
 Rate of charging may be of minute range
28

 “ WIRELESS CHARGING OF MOBILE
PHONES”
 Use of rectenna and sensor in mobile phone could provide
new dimension in the revolution of MOBILE POWER
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 Thus this paper successfully demonstrates a novel method of
using the power of microwave to charge mobile phones
without use of wired chargers.
 It provides great advantage to mobile phone users to carry
their phones anywhere even if the place is devoid of facilities
for charging.
 Has effect on human beings similar to that from cell phones at
present.
30

 Ms.Priyanka M.Shah,Ms.Ila D.Paramar,Ms.Heena R.Patel
“Wireless Power Transmission Using Microwave”
 www.seminarprojects.com
 www.seminarsonly.com
 www.wikipedia.org
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PPT on Wireless charging of mobile using microwaves

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