"energy goes where attention goes..."

2.  Introduction to piezoelectricity
 Piezoelectric effect and its types
 Energy harvesting ?
 Types of energy harvesting
 Piezoelectric energy harvesting
 sources of vibrations
 Block diagram(circuit)
 Applications of Piezoelectric energy
 Advantages of piezoelectric energy harvesting
 Disadvantages with piezoelectric energy harvesting
 conclusion

3.  Piezo=“pressure”
 It is the ability of certain materials to generate an electric
charge in response to applied mechanical stress.
 Piezoelectric materials : quartz , rochelle salt etc…
Types of piezoelectric effects:
* Direct piezoelectric effect
* Converse piezoelectric effect

4. ?

5. Types of energy harvesting :
• Macro-scale energy harvesting
Sources : solar , wind , tidal etc…
• Micro-scale energy harvesting
Sources : vibrations , pressure , heat etc…

6.  It is a micro-scale energy harvesting
 It uses “direct piezoelectric effect”
phenomena

7. Crystal:
Piece of solid substance having high
refractive index
Sources of vibration for a crystal :
1)Power generating sidewalks or footpaths
2)Power generating shoes

8. 3)Gyms , work places
4)Mobile keypads and key bords
5)Floor mats , tiles , carpets
6)Dance clubs etc…

9. Circuit of a piezoelectric
energy harvester :

10. Applications :
• Sensing elements
• Ultrasound imaging
• Sonar sensors
• Chemical and biological sensors
• Musical instruments
• Automatic applications
• Piezoresistive devices
• Piezoresistors

11. Advantages :
 Unaffected by external magnetic fields
 Pollution free
 Easy replacement of equipment

12. Disadvantages :
 Crystal gets cracked if it is overstressed.
 May be effected if used at high temperatures for
long time.
 Cannot be used for static measurements.

13. Finally , why do we need this ?
Harvest the type of energy , wherever you go ,
whatever the circumstance will be , it should always
spaces and lives around you…:)
Because “energy flows where attention goes….”
thank uh…