Download 2. A wearable system of micro machined piezoelectric cantilevers

ENERGY MANAGEMENT based on Embedded System
A WEARABLE SYSTEM OF MICROMACHINED
PIEZOELECTRIC CANTILEVERS COUPLED TO A
ROTATIONAL OSCILLATING MASS FOR ON-BODY ENERGY
HARVESTING
ABSTRACT
Over the past two decades, there has been significant interest In converting
mechanical energy from human motion Into electrical energy. This electrical
energy can then be used to Recharge batteries in electronic devices or directly
power small scale, Low-power circuits.
A number of commercial devices use human power to produce Electricity
such as hand-crank generators (for powering Flashlights, radios, and recharging
mobile devices), and pedal Generators (that can be used to power larger electrical
devices typically generating between 100 and 1000Wand can be as high As 1000
W). However, these generators require concentrated human Effort for long periods
of time, which might preclude the User from doing other tasks. It is desirable to
scavenge or harvest Energy from human movement, while the user is performing
His/her everyday activities.
Some of the earliest work to harvest energy from human gait Dates back
almost 250 years and include the self-winding Watch and closely related modern
electromechanical (or so called Electrical) self-winding watches, and various shoe
mounted Foot cranks Driven by the potential to power small, portable electronic
devices, the first work in self-powered electrical Energy harvesting included
ENERGY MANAGEMENT based on Embedded System
electromagnetic vibration in A device carried on the hip, and piezoelectric strain
energy Harvesting by a device mounted in the heel of a shoe.
This Initial work has lead to substantial interest in gait powered energy
Harvesting. The mechanical energy generated from the movement of the human
movement into electrical energy. The output of accelerometer and piezo plate is
given to the ADC for analog to digital conversion and then to microcontroller in
order to monitor the value of energy generated.
The outputs of transducers are also given to boost controller. The obtained
energy is boosted up using Boost Controller and given to DC-DC converter. The
output of the DC-DC converter is stored in a storage device. The stored energy is
inverted to AC voltage and is given to the relay and utilized for other purposes for
lighting lamps for example. The voltage control is provided by the microcontroller.
EXISTING SYSTEM
Energy harvesting sources including solar, wind and thermal each with a
different optimal size. They either waste much available energy due to impedance
mismatch, or they require active digital control that incurs overhead, or they work
with only one specific type of source. No more research on the vibration domain.
DISADVANTAGES
 Construction cost is high in normal energy harvesting like wind, solar.
 Not will be compact.
 More storage device required.
PROPOSED SYSTEM
ENERGY MANAGEMENT based on Embedded System
This paper has investigated the optimal power that can be extracted from
human gait over a wide speed range using electromechanical vibration conversion
from human movement.
Driven by the potential to power small portable electronic devices, more
recent research in energy harvesting from gait has focused on 1) increasing the
power output 2) energy harvesting from the motion of backpacks during walking,
and 3) minimizing energy expenditure by controlling the breaking force.
ADVANTAGES
 Good output power.
 Easy Method.
 Portable Technologies.
 Boost level increased.
 Should be trustable one.
ENERGY MANAGEMENT based on Embedded System
BLOCK DIAGRAM
VIBRATION
SOURCE
ACCELERO
METER
DC-DC
BOOSTER
SUPER
CAPACITOR
PIEZO PLATE
ADC
ATMEL
AT89S52
LCD
STORAGE
DEVICE
ENERGY MANAGEMENT based on Embedded System
AC LOAD
RELAY
INVERTER
(DC-AC)
HARDWARE REQUIREMENTS
 MICROCONTROLLER – Collect the sensors value and produce PWM
 ADC- converts the sensors value in 8 bit digital output to UC.
 ACCELEROMETER - produce movements corresponding analog
values
 PIEZO ELECTRIC PLATE- convert vibration into electricity
 DC-DC BOOSTER – boost up the input voltage depends upon PWM
 SUPER CAPACITOR- make uniform charging into the battery
 BATTERY- used for the energy storage purpose
 RELAY- provide automatic switching operation
 INVERTER- convert the dc voltage into ac voltage for rut the load
ENERGY MANAGEMENT based on Embedded System
 LCD- for monitoring purpose
SOFTWARE REQUIREMENTS

KEIL CROSS COMPILER

PROTEUS SOFTWARE