Its regarding how sound vibrations and piezo crystals generating the electricity with even the modest of tech and unknown ways...something really interesting and out of the way..surprisingly enough the piezo energy is the all new kind of invented renewable which is being come into use, i hope you really like the content described..!

1. PIEZOELECTRICITY AND ITS
APPLICATIONS
BY:
1. ARPAN KUMAR KAR
2. SHAILJA KANT UPADHYAY
3. SAHAJ BHARINDWAL
4. AJINKYA GARUD
20/09/18
SUBMITTED TO - MS. SAKSHI BA

2. CONTENTS
1. INTRODUCTION
2. MATERIALS
3. WORKING
4. APPLICATIONS
5. CONCLUSION

3. INTRODUCTION
• Piezoelectricity was discovered by Curie brothers in
1880.
• It is the generation of electric field from applied
pressure.
• It is observed in crystalline materials with no
inversion symmetry.
• 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).

4. MATERIALS

5. WORKING
• The positive & negative charges are
symmetrically distributed in a crystal.
• Piezoelectric ceramic materials are not
piezoelectric until the random ferroelectric
domains are aligned by a process known as
POLING.
• Poling consists of inducing a DC voltage across
the material.

6. CONTD.
• Fig: (a) Random orientation of domains prior to
poling
(b) Poling in DC Electric Field
(c) Remanent polarization after field is removed

7. CONTD.
• When pressure is applied to an object, 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.

8. PIEZO TRANSDUCER

9. PRIME APPLICATIONS:
PIEZOELECTRIC ENERGY
HARVESTING

10. POWER GENERATING SIDEWALK
Charging pads under the cross walk collect
energy from the vibrations. Piezoelectric
charging panels channel energy to
lithium ion batteries ( which can be used
further)

11. 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.

12. 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.

13. 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.

14. FLOOR MATS AND 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.

16. OUTPUT POWER
• The output voltage obtained from a single
piezoelectric crystal is in millivolt(mV) range,
which is different for different crystals.
• And the wattage is in microwatt(μW) range.
• In order to achieve higher voltages, the
piezoelectric crystals can be arranged in
series.
• Used to charge batteries for backup supplies
or to power low-power microprocessors.

17. OTHER APPLICATIONS
• Electric cigarette lighter:
Pressing the button of the lighter causes a spring-
loaded hammer to hit a piezoelectric crystal,
producing a sufficiently high voltage that electric
current flows across a small spark gap, thus heating
and igniting the gas.
• As sensing elements:
Detection of pressure variations in the form of sound
is the most common sensor application, e.g.
piezoelectric microphones. Sound waves bend the
piezoelectric material, creating a changing voltage.

19. CONCLUSION
• Piezoelectricity is a revolutionary source for
“GREEN ENERGY”.
• Flexible piezoelectric materials are attractive
for power harvesting applications because of
their ability to withstand large amounts of
strain.
• Convert the ambient vibration energy
surrounding them into electrical energy.
• Electrical energy can then be used to power
other devices or stored for later use.

20. REFERENCES
• “Piezoelectric Electric based energy harvesting” Nuthan
Raju, V. Karthik ,T.P Mohd. Jaffar Ahmed Khan.
• Tomasz G. Zielinski, “ Fundamentals of piezoelectricity”,
Institute Of Fundamental Technological Research,
Warsaw, Poland.
• Tanvi Dikshit, Dhawal Shrivastava, (February 25,2010),
“ Energy Harvesting via Piezoelectricity”.
• http://www.electroschematics.com/4301/piezoelectricit
ydesign-notes.
• http://web.archive.org/web/20101006002651/http://w
ww.eetimes.com/electronics-
news/4197064/Piezoelectric-Technology-A-Primer