This document discusses piezoelectric energy harvesting. Piezoelectric materials generate an electric charge when subjected to mechanical stress. Common piezoelectric materials include quartz, Rochelle salt, and various ceramics. The document outlines how piezoelectricity works and some applications, such as sensors, lighters, and phones. Advantages are that piezoelectric energy harvesting is green, pollution-free, and has low maintenance costs. Disadvantages include low power outputs and effects from high stress and temperature changes. The conclusion discusses using piezoelectric strips in shoes to harvest energy from walking and power portable electronic devices.

1. M.UDAY KUMAR
PIEZOELECTRIC ENERGY
HARVESTING

2. ABSTRACT
 Energy harvesting becomes more and more
important in our life. Energy is harvested from
ambient environment such as mechanical,
thermal, light, electromagnetic, human body, and
etc to replace traditional sources. Mechanical
energy harvesting is the most promising of
several energy harvesting techniques: it uses
piezoelectric (PE) components that transfers the
vibration energy to the electrical energy. This
electrical energy can be regulated and stored
before using by the electronic devices where the
replacement of the batteries is impractical, such
as the wireless micro sensor networks,
implementable medical electronic, and tire
pressure sensor system.

3. INTRODUCTION
 Piezo electric effect is the ability of certain
materials to generate an electric charge in
response to applied mechanical stress
 Piezo electricity is derived from greek word
“piezo” or “piezein”. Which means to squeeze or
press
 Piezo electric effect is formed in crystal having no
centre of symmetry
 Piezo electricity was first proved by french
physicist btothers pierre and jacques curie

4. MATERIALS EXHIBIT PIEZO
ELECTRIC EFFECT
•Quartz
•Ammonium dihydrogen phosphate (ADP)
•Lithium sulfate
•Rochelle salt.
•Antimony sulfoiodide
•Piezoelectric ceramics Barium titanate (TB-1)
•Calcium barium titanate (TBK-3).
.Dry bone

5. WORKING
 Crystals which acquire a charge when
compressed, twisted or distorted and vice versa
are said to be piezoelectric materials
 When piezo electric materials are subjected to
stress charges are distibuted and create potential
difference

6. APPLICATIONS
1.Sensing instrument(eg.pressure detection)
2.Ultra sonic sensors
3.Electric ciggar lighter
4.Mobile phones and kreypads
5.Series of crystalls used to blow lights
6.Gyms and working places
7.Piezo electric motars

7. ADVANTAGES
 It is a green energy
 pollution free
 Maintanence cost is low
 Easy replacement of equipment

8. DISADVANTAGES
 Crystals is break due to high stress
 Power out put is too low
 May effect due to temperature
 Low energy density

9. Conclusion
 The goal of the project is to determine if it is
possible to change a personal electronic device
using wasted energy harvested from walking or
jogging. I used a piezoelectric strip that generated
energy when bent. The output of the piezoelectric
plate was connected to an energy harvesting
device and whose output was connected to either
a battery or super capacitor. Once this device
was charged, it was connected to an electronic
device, such as an iPod, for final charging.