wireless mobile charging using microwaves

WIRELESS MOBILE CHARGING USING MICROWAVES

SEMINAR GUIDE Prof. Y.K MISHRA

PRESENTED BY-KAUSHLENDRA SINGHROLL No.13419B.TECH ,3rd YEARELECTRONICS ENGINEERING

CONTENTS INTRODUCTION WHAT’S HAPPENING MICROWAVE REGION FREQUENCY SELECTION TRANSMITTER SECTION RECEIVER SECTION ADVANTAGES DISADVANTAGES APPLICATION CONCLUSION

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INTRODUCTION

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

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INTRODUCTION [contd]

More you talk more the mobile get charged!

No separate mobile charger

Removal of talk time and battery stand by from mobile specifications

Additives to mobile handsets: Sensor Rectenna

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WHAT’S HAPPENING?

Microwave signal is transmitted from transmitter along with message signal using slotted waveguide antenna at frequency 2.45 GHz

Charging made universal

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[7]

MICROWAVE REGION Wavelength : 1 mm-30 cm Microwave can be used for :

1) Measuring body temperature 2)Transmitting information 3) Remote sensing 4) RADAR 5) Communication

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Microwave Region Of Electromagnetic Spectrum We choose s- band of microwave region(2-4GHz)

Designation Frequency range

L Band 1 to 2 GHz

S Band 2 to 4 GHzC 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

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[7]

FREQUENCY SELECTION

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

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BLOCK DIAGRAM OF WHOLE SETUP

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[8]

TRANSMITTER SECTION

Consists of two parts– Magnetron– Slotted waveguide antenna

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MAGNETRON

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

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[7]

MAGNETRON [contd.]

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

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STRUCTURE OF MAGNETRON

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[8]

SLOTTED WAVEGUIDE ANTENNA

 It is an Omni-directional antenna. 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.

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Slotted Wave Guide Antenna [5]

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RECEIVER SECTION

Basic additions to mobile phone SensorRectenna

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SENSOR CIRCUITRY Simple circuit which detects whether the user is making a call. Simple Frequency to Voltage 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 Frequency to Voltage converter is LM2907

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SENSOR CIRCUITRY [contd.]

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.

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Sensor Circuitry

LM 2907 IC

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[8]

RECTENNA What is Rectenna? Rectenna is a rectifying circuit that converts

microwave energy into DC output. Single Rectenna is approx 23 mm , 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.

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RECTIFYING CIRCUIT 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

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RECTIFICATION RECTENNA

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Rectifying Circuit [4]

ADVANTAGES

Charging mobiles wirelessly

Saving time for charging

Wastage of power is less

Better than witricity

Get charged as we make call during long journey.

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DISADVANTAGES

Radiation problems may occur

Network traffic may cause problems in charging

Charging depends on network coverage

Rate of charging may be of minute range

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APPLICATION

As the topic’s name itself it is used for“ WIRELESS CHARGING OF MOBILE

PHONES”

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FUTURE SCOPE 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.

Use of rectenna and sensor in mobile phone could provide new dimension in the revolution of mobile power.

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CONCLUSION

 Thus this technique successfully demonstrates a novel method of using the power of the microwave to charge the mobile phones without the use of wired chargers.

Thus this method provides great advantage to the mobile phone users to carry their phones anywhere even if the place is devoid of facilities for charging.

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REFERENCES

[1]. Theodore.S.Rappaport , “Wireless Communications Principles and Practice”

[2]. Wireless Power Transmission – A Next Generation Power Transmission System, International Journal of Computer Applications Volume 1 – No. 13.

[3]. Lander, Cyril W. "2. Rectifying Circuits". Power electronics London: McGraw-Hill. 3rd edition, 1993.

[4]. Tae-Whan yoo and Kai Chang, "Theoretical and Experimental Development of 10 and 35 GHz rectennas" IEEE Transaction on microwave Theory and Techniques, vol. 40. NO.6. June.1992.

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REFERENCES [contd.]

[5]. Pozar, David M. Microwave Engineering Addison– Wesley Publishing Company,1993.

[6]. Wireless Power Transmission – A Next Generation Power Transmission System, International Journal of Computer Applications Volume 1 – No. 13.

[7]. www.seminarsonly.com[8]. International Journal of Innovative Research in

Science, Engineering and Technology, Published on Feb 1,2014

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