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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

1



INTRODUCTION

PROBLEM STATEMENT

OBJECTIVES

LITERATURE REVIEW

METHODOLOGY

RESULTS ANDDISCUSSION

CONCLUSION AND

RECOMMENDATION

2



3



•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



5



• For people who enjoy an active lifestyle, they will

find it difficult to keep their entertainment device

charged while they are On- The-Go.

6



7



• 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.

8



9



• “Harvesting human kinetic energy” by

Longhan Xie and Ruxu Du, 2012.

• Mechanical energy of human body.

• Method proposed.

10



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.

11



• Human Passive Motion Harvesting System(Abdi. H and Mohajer. N, 2010).

• The proposed system.

• Piezoelectric transducer.

12



• Biomechanical Energy

Harvesting by J.A. Hoffer et

al., 2008.

• Regenerative braking.

• Mechanical, control and

power generation systems.

13



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



15



ProblemDefinition

ConceptualDesign

Proof ofConcept

DesignFinalization

PrototypeFabrication

Testing

Finalization

16



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.

17



18



19



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

20



WIRECOIL

21



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

22



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

23



(a) Humanbody

motion

(b)Engineerin

gCalculatio

n and Analysis

(c)ComputerSimulation

forCharging

Circuit

Proof ofConcept

24



(A) Human body motion

PROOF OF CONCEPT

25



(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:

26



• 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

27



(C) COMPUTER SIMULATION FOR

CHARGING CIRCUIT

Input

Bridge

Rectifier

Filter

Voltage

Regulator

Charging

Circuit

28



•Our finalized design consist of the 3 main components

- Armband

- Power generator: Magnet and 1500 turns copper

coils.

- Charging circuit

DESIGN FIN LIZ TION

29



PROTOTYPE F BRIC TION

30



• Before everything is assembled together, we

had to make sure each component isserving its purpose well.

TESTING

31



Testing Of Magnet And Coils Assembly

32



Testing Of Charging Circuit With LED

33



• Breadboard circuit design which is then soldered

into veroboard.

FIN LIZ TION

34



Material

Price (RM)

Magnets

90

Copper Coil 8

Spring 5

Casing 4

Armband 8

Miscellaneous 15

Total 130

COST N LYSIS

35



36



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.

37



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

38



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)


• The magnetic field cut trough

coil more often.

• The magnet travel through thecoil easil .

ME SUREMENT USING

DESIGN STUDIO SOFTW RE

39



Forearm (jogging with spring)


• The magnetic field cut trough

coil more often.

Forearm( jogging without spring)


• The distribution of peak also little

40



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

41



Result Of Charging Circuit With Cellphone

42



43



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



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



• For charging circuit, a combination of

electrical components assembled to convert

AC voltage into DC voltage and current.

• Incorporate these components into a jogging

46



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



48



•Use LT1512 Integrated Circuit - constant-

current/constant-voltage

•Reduction of components size - lighter product

•Use two instead of one. - Double voltage

49



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