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GROUP 31POWERED BY PEOPLE
Supervisor: Dr. Azmi Abdul Wahab
Team Leader :Nur Haedzerlin Bt Md Noor
14883
Team Members:
Fernando Juma Muzonde14617
Muhammad Adham Bin Adnan 14900
Tan Chee Huat 16072
Raymond Joseferd
14962
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INTRODUCTION
PROBLEM STATEMENT
OBJECTIVES
LITERATURE REVIEW
METHODOLOGY
RESULTS ANDDISCUSSION
CONCLUSION AND
RECOMMENDATION
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•Most electronic devices run on battery and
sometimes one can barely find the time to
recharge them.
• The device created can remedy the situation
whereby no one will have to wait around to
recharge their iPods and smart phones.4
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• For people who enjoy an active lifestyle, they will
find it difficult to keep their entertainment device
charged while they are On- The-Go.
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• To produce a working prototype that converts
human body motion into electrical energy.
• To create a working prototype to charge an
entertainment device such as MP3 player.
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• “Harvesting human kinetic energy” by
Longhan Xie and Ruxu Du, 2012.
• Mechanical energy of human body.
• Method proposed.
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Number of turns of coils required:
= −∅
Where:
N = Number of turns of wireØ = Magnetic Flux = B x A
As stipulated in the design requirements,
= 5
5 + =
• Faraday's law of induction.
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• Human Passive Motion Harvesting System(Abdi. H and Mohajer. N, 2010).
• The proposed system.
• Piezoelectric transducer.
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• Biomechanical Energy
Harvesting by J.A. Hoffer et
al., 2008.
• Regenerative braking.
• Mechanical, control and
power generation systems.
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CITATION METHOD CONCLUSION
Longhan Xie and
Ruxu Du (2012)
Electromagnetic
induction initiated by
eccentric rotor, which
absorbs human
motion.
Simulation shows that the harvester with
40mm diameter and 50g weight, worn on
the wrist, can produce dozens of mW of
electricity during normal walking.
Abdi. H andMohajer. N (2010)
Integration of apiezoelectric harvester
into belt to generate
electricity from
breathing.
Results showed that it can provide up to1.2mW in rest time and 2.3mW after mild
exercise time. This amount of energy is
sufficient to power an mp3 player.
Q. Li, V. Naing,
J.A. Hoffer, D.J.
Weber, A.D. Kuo
and J. M. Donelan
(2008)
Converting knee
motion into electricity
with an aid of
regenerative braking.
Experimental results show that generative
braking generated
4.8±0.8 W of electrical power with a
minimal increase in metabolic cost.14
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ProblemDefinition
ConceptualDesign
Proof ofConcept
DesignFinalization
PrototypeFabrication
Testing
Finalization
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PROBLEM DEFINITION
• As mentioned earlier in Problem Statement,
people who enjoy an active lifestyle will find itdifficult to keep their entertainment device
charged while they are On- The-Go.
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The minimum voltage required for a
charging application is 5V.
Power generation
•Using Faraday’s Law of Induction, our
conceptual design was to incorporate the
magnet which is moved inside thecylinder wound by copper coils by
human body motion.
CONCEPTU L DESIGN
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WIRECOIL
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ChargingCircuit
• Electromagneticinduction
• AlternatingCurrent (AC)
Input
• Bridge RectifierDiode
• To change from
AC to DC
Rectifier• Capacitor
• Smoothing thewaveform
Filter
• LM 317
• To increase thelow voltage to a
higher voltage
VoltageRegulator • Provide a USB
port forcharging thedevice.
Batterycharger
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Main Components Of The Circuit
CIRCUIT PART COMPONENTS VALUE QUANTITY
Rectifier Zener Diode (BZX55C10)
-
4
Filter Capacitor 1
Voltage Regulator
LM 317 - 1
Capacitors
.
2
Resistor
.
1
Variable Resistor
1
Battery Charger
Resistor
1
Capacitor
1
NPN Transistor
-
1
Zener Diode (BZX55C10)
-
1
Diode (1N4002) - 1
Female USB Cable
-
1
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(a) Humanbody
motion
(b)Engineerin
gCalculatio
n and Analysis
(c)ComputerSimulation
forCharging
Circuit
Proof ofConcept
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(A) Human body motion
PROOF OF CONCEPT
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(B) ENGINEERING CALCULATION ANDANALYSIS
Neodymium Iron Boron Magnet
Specifications:
i. Magnetic Flux Density: 1.32 Tesla
ii. Dimension: 1.3 cm diameter x 4cm lengthiii. Area: πDL = 1.634 x10^-3 m^2
• Copper coil selection:
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• Assuming the average time for the magnet to pass
through the coil is 0.5 seconds,
=5 +
=
5 + 0.5
1.32 × 0.0016340.5 = 1275
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(C) COMPUTER SIMULATION FOR
CHARGING CIRCUIT
Input
Bridge
Rectifier
Filter
Voltage
Regulator
Charging
Circuit
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•Our finalized design consist of the 3 main components
- Armband
- Power generator: Magnet and 1500 turns copper
coils.
- Charging circuit
DESIGN FIN LIZ TION
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PROTOTYPE F BRIC TION
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• Before everything is assembled together, we
had to make sure each component isserving its purpose well.
TESTING
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Testing Of Magnet And Coils Assembly
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Testing Of Charging Circuit With LED
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• Breadboard circuit design which is then soldered
into veroboard.
FIN LIZ TION
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Material
Price (RM)
Magnets
90
Copper Coil 8
Spring 5
Casing 4
Armband 8
Miscellaneous 15
Total 130
COST N LYSIS
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Our consideration
• The magnet is attached to the forearm for
comfort.
Our assumption
• People will jogging and sometimes sprinting.
• The speed of jogging and sprinting is sameas amateur people.
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NO OF TURNS (2 MAGNETS) VOLTAGE
50 0.16 V
300 1.3V
1550 3.37 V
• Multimeter cannot detect small changes,
therefore the reading is not accurate.
• Therefore, we used a computer software from
the lab to plot the induction graph.
Multimeter Readings
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Forearm (spr int witho ut spr in g)
• Maximum amplitude is 5.551V.
• The oscillation of the cycle is not
even.
• The magnet cannot travel through
Forearm (spr int w ith spr in g)
• Maximum amplitude is 9.529V.
• The magnetic field cut trough
coil more often.
• The magnet travel through thecoil easil .
ME SUREMENT USING
DESIGN STUDIO SOFTW RE
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Forearm (jogging with spring)
• Maximum amplitude is 5.551V.
• The magnetic field cut trough
coil more often.
Forearm( jogging without spring)
• Maximum amplitude is 4.507V.
• The distribution of peak also little
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4.507
6.936 5.551
9.5298.2479.995 8.558
9.995
0
2
4
6
8
10
12
Jogging With noSpring
Jogging WithSpring
Sprint With NoSpring
Sprint With Spring
Forearm
Palm
Voltage VS ConfigurationVolts
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Result Of Charging Circuit With Cellphone
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Why?
• People on-the-go may not have time to charge
their devices.
• Absolutely no electric socket or power supply
needed.
• Works by simply utilizing running motion.
• Faraday's Law of Induction.44
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How?
• Two major components: magnet coils and
charging circuit.
• Voltage generated depend largely on magnet
strength.
• One of the strongest commercially availablemagnet, Neodymium Iron Boron.
accessory.45
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• For charging circuit, a combination of
electrical components assembled to convert
AC voltage into DC voltage and current.
• Incorporate these components into a jogging
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Results?
• Testing: ensuring workability and
improvements.
• Spring attached to magnet coils.
• Forearm position to ease comfort and simplify
wiring.
• Maximum peak: 9V , > 5V.
• Inconstant charging. 47
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•Use LT1512 Integrated Circuit - constant-
current/constant-voltage
•Reduction of components size - lighter product
•Use two instead of one. - Double voltage
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