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A NOVELBATTERY CHARGER

OPERATED FROMRANDOM SOUND

SOURCES ORAIR PRESSURE

Presented bySneha Liz Paul Roll No:49

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INTRODUCTION

Cell Phones – Integral Part of Our Social Life• Social Contacts• Playing Games• Watching Movies, Listening Music, etc.• Banking• ConferencesAccording to the Magazine `THE GUARDIAN’, there are 4.1 billion users of Cell Phones in the

World, ie. 60 % of World Population.

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INTRODUCTION ...CONTD

`International Energy Agency’ says 1.4 billion people around the world have no access to Electricity.Scarcity of Electricity affects a huge portion of

population in Cell Phones usage.Natural calamities, like Earth Quakes, Tsunamis,

Landslides, etc. lead to power outages. Daily One Unit Electricity required for Cell Phone

charging.THERE IS AN URGE FOR

AN ALTERNATE ENERGY SOURCE.

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CELL PHONE CHARGERS

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CELL PHONE CHARGERS ... CONTD

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PIEZOELECTRICITY Piezoelectricity was discovered by Curie Brothers

in 1880. It is the generation of electric field from applied

pressure. It is observed in crystalline materials. The materials exhibiting the direct piezoelectric

also exhibit the reverse piezoelectric effect (the internal generation of a mechanical strain

resulting from an applied electrical field.)

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PIEZOELECTRIC MATERIALS

NATURAL SYNTHETIC

Quartz Lead zirconate titanate (PZT)

Rochelle Salt Zinc oxide (ZnO)

Topaz Barium titanate (BaTiO3)

Sucrose Gallium orthophosphate (GaPO4)

Tendon Potassium niobate (KNbO3)

Silk Lead titanate (PbTiO3)

Enamel Lithium tantalate (LiTaO3)

Dentin Langasite (La3Ga5SiO14)

DNA Sodium tungstate (Na2WO3)

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PIEZOELECTRIC WORKING

Crystals generally have a charge balance where negative and positive charges precisely nullify each other

When this charge balance is disrupted by an external force, such as, applying physical stress to a crystal, the energy is transferred by electric charge carriers

When pressure is applied, a negative charge is produced on the expanded side and a positive charge on the compressed side.

Once the pressure is relieved, electrical current flows across the material.

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PIEZO TRANSDUCER

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PIEZOELECTRIC MATERIAL-EFFECTIVE SOUND SENSORS

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PIEZOELECTRIC ENERGY HARVESTING

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POWER GENERATING SIDEWALK

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GYMS AND WORKPLACES

Vibrations caused from machines in the gym.

At workplaces, piezoelectric crystal are laid in the chairs for storing energy.

Utilizing the vibrations in the vehicle like clutches, gears etc.

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MOBILE KEYPADS & KEYBOARDS

Crystals laid down under keys of mobile unit and keyboard.

For every key pressed vibrations are created.

These vibrations can be used for charging purposes.

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POWER GENERATING BOOTS OR SHOES

Idea was researched in US.

To power the battlefield equipment by generators embedded in soldier boots.

Idea was abandoned due to the discomfort.

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FLOOR MATS & PEOPLE POWERED DANCE CLUBS

Series of crystals can be laid below the floor mats, tiles and carpets.

One footstep can only provide enough electrical current to light two 60-watt bulbs for one second.

When mob uses the dance floor, an enormous voltage is generated.

This energy is used to power the equipment of nightclubs.

17Block Diagram

PROPOSED METHOD

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Circuit Diagram

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Low voltage Audio power amplifier 4V ac output with biasing voltage of 5V Voltage gain 20-200 Applications: AM-FM radio amplifiers, TV sound

systems, Power converters etc.

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Quadrupler Circuit

DC output equal to four times the peak voltage value (4Vp) of the sinusoidal input signal. Also, using large value capacitors will help to reduce the ripple voltage.

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RESULT & OBSERVATIONS

Output of voltage quadrupler circuit:11.2V with 65mA from 118db sound.

Battery output:2.1V after 3min. Within 20mins ,fully charged-3.68V. Output power of quadrupler circuit:-o .0757W before applying soundo .7345W after applying sound source

on piezo disc.

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For Different Distances And Intensity Of Sound Source In Outdoor

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COMPACT CHARGER:DESIGN AND ACCESSORIES

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FUTURE IMPROVEMENT

Piezoelectric transducers suitably placed inside and outside of cell phone casing.

Conversion circuit housed inside mobile phone.

User talks over his mobile, sound from his voice converts into electric power.

Increasing air or sound pressure mechanically-using horn.

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Increasing air pressure mechanically by customized horn

Placement of transducer with horn

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APPLICATIONS Military Purpose (war field, border and hilly regions). When travelling in a long journey, during a trek or beach

when switch boards are not available. While continuously talking on the phone with a low battery

especially in android and smart phones where battery gets quickly discharged due to running applications.

In outdoors with various sources like train whistle in railway station, noise in traffic, industries and public places.

Sound produced from a running hydraulic pump and construction piling.

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ADVANTAGES Simple & Portable Useful in areas where there is

no electric power at all. Helpful during natural

disaster.

DISADVANTAGES We do not get piezoelectric

transducer with high conversion efficiency.

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CONCLUSION An effective way of producing usable electric power from available sound

energy is presented. Piezoelectric transducers can be used for conversion of sounds into electric

energy. The produced electric energy is stored in super-capacitors which is then

summed up and amplified through adder and voltage multiplier circuits. The resultant electric power can be used to charge a rechargeable mobile

battery. If we will be able to convert sound energy to electric energy efficiently it

could help us to reduce the scarcity of electrical energy globally. The noise pollution on roads and runways due to traffic could be converted

into electric energy and power the street lightning, signals and various other electrical appliances.

With considerable research and sophistication to this technology, we can expect a world with no external chargers for mobile phones in the future.

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REFERENCES1. Tryhorn, Chris. The Guardian. Guardian News and Media, 02 Mar.

2009. Web. 02 Mar. 2012.2. Seminar on “Energy poverty: The missing Millennium Development

Goal”, International. Energy Agency, March, 2012.3. John Therampilly, Energy harvesting from multiple sources for

Battery charging. March 2012.4. Robert John Littrell, “High Performance Piezoelectric MEMS

Microphones”, Dissertation of Doctor of Philosophy (MechanicalEngineering), The University of Michigan, 2010.

5. Takeuchi M, Matsuzawa S, Tairaku K, Takatsu C. Piezoelectricgenerator as power supply for RFID-tags and applications, Proc. IEEEUltrasonics Symposium, New York City, USA, pp. 2558–2561, 28–31October 2007.

6. T. Dikshit, D. Shrivastava, A. Gorey, A. Gupta, P. Parandka, S. Katiyal,“Energy Harvesting via Piezoelectricity” , proceedings of the 4thNational Conference; INDIACom-2010, 25 – 26 February, 2010.

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