ED 100 Mechanical energy harvesters for portable electronic devices

1. ED 100 Mechanical energy harvesters for portable electronic devices Group B4-5a Dong-Kyeong Lee, JisuChoi, Seoyun Yum, Na Than Jo, Eui Jae Yun, Khang June Lee

2. Objective • Design amechanical energy harvesters for portable electronic devices. • benefit the public • efficient, affordable • Anywhere, any given time

3. Device • Heating &Cooling System • Mobile phone • Lighting umbrella • Book-light

4. Stakeholder & Customer & User

5. Target for Survey & Interview Survey Interview • Students • Professors • Random individuals. • graduate students • Professors in charge of mechatronics/ mechanical/ electrical/ material engineering areas.

6. Research

7. Results • Book-light survey • 32% have used book-lights before • 83% are willing to pay upto 50000Won • Mobile Phone/MP3 survey • When purchasing the device 42% look at the functions, 57% look at the design, 1% at price • Interview • PLZT is a very efficient piezo-electric material

8. Previous Solutions

9. FR, NFR, C, CN, SC • FR1: generate energy • FR2: stable circuit • NFR1: affordable • NFR2: look good • C1: size and weight • C2: budget • CN1: portable • CN2: easy to use • SC: durable

10. Ideas (1)

11. Ideas (2)

12. Ideas (3)

13. FR, DP • FR1: Durable • FR2: Generate electrical energy • DP1: Able to take damage when dropped • DP2: Small and easy to carry around

14. Final Design

15. Any Questions? ThankYou

16. Back-up slides

22. Functional Requirements (FR) • FR.1.Eco-friendly • 1.1 It should be made of some material that could decay. • 1.2 It should recycle when it is broken. • FR.2. Withstand the damages from outside. • 2.1. This device could endure the shock from falling from your hands while you are calling. • 2.1.1. Should endure the shock from falling at the height of 180cm • 2.2. This device should absorb the shock. • 2.3. This device should resist electromagnetic wave from the mobile phone. • 2.4. This device should withstand the heat from the other circumstance or sources from a body or a mobile phone or weather, etc • 2.5. This device should be waterproof device. • 2.6. This device should stable from the chemical reaction.

23. Functional Requirements (FR) • FR.3. Generating energy • 3.1. This device should convert remnant energy into electric energy efficiently. • 3.2. This device should take advantage of other wasted energy at the maximum if possible • 3.3. This device should produce the electric energy, and at least the device enables us to make 3 minutes call in the emergency. • FR.4. Electric circuit • 4.1. Electric circuit in the device should withstand the voltage from mobile phone. • 4.2. The internal resistance of the circuit should be small as possible. • 4.3. The connection part (to the mobile phone) should be stable, not be corrosive.

24. Non-Functional Requirements (NFR) • nFR1. Not to be heavy • 1.1 Size should be small as possible for user’s convenience. • 1.2 Use light material as long as the technology permits • 1.3 Not feel any inconvenience at all during using the device. • nFR2. Not to be much expensive. (Affordable) • 2.1. Use cheaper material, if possible, and high-efficiency materials as possible. • nFR3. Be nice to look at the device • 3.1. Its design could induce people to buy it. • 3.2. Its design should not hinder the purpose of the device to generate energy. • nFR4. Not too competitive with other companies as this may lead to large amount of competition and affect the resources available to be used.

25. Input Constraints (C) • C1. Size of the harvester should not be too big (size as big as wallet) • C2. Mass of the harvester should not be too heavy (<1kg) • C3. High durability

26. System Constraints (C) • C4. Energy produced should be transported steadily • C5. Electric current produced should be transformed into appropriate DC volt • 5.1 Electric voltage produced (AC) should be transformed to DC • 5.2 Electric voltage produced (DC) should be transformed to adequate DC volt • C6.The system should have enough high efficiency • 6.1 The efficiency of electrical energy production system • 6.2 The efficiency of electrical energy transportation system

27. System Constraints(2)(C) • C7. Means of production of energy are constrained • 7.1 Magnetic induction • 7.2 Piezoelectric matter • C8. The harvester should not be affected by weather or surrounding environment • 8.1 Emergency use • 8.2 The harvester should be able to used regardless of the place of usage

28. External constraints(C) • C10. Limited power of human • 10.1 No battery for the system is available • C11. Budget is limited per team (900,000 won for our team) • C12. Time for the project is limited (Only for this spring semester)

29. Customer Needs (CN) • CN1. Generate energy • 1.1 able to generate enough energy to use • 1.2 do not require long time to generate energy • CN2. Easy to use • 2.1 Every people (ex. children, woman, man) must be able to use • 2.2 makes maximum energy through minimum effect • CN3. Portable • 3.1 small mass • 3.2 small volume • 3.3 easy to carry all the time

30. Customer Needs (CN) • CN4. General • 4.1 not limited on one electronic device • 4.2 can be used for many electronic devices which have similar method for charging • 4.3 can be used for long time • CN5.Environment friendly • 5.1 not emits pollutions • CN6. Cost • 6.1 the cheaper the better • 6.2 the quality have to be good

31. Selection Criteria (SC) • SC.1. The device have to as possible as cheap. • SC.2. The device have to as possible as portable. • 2.1. as possible as small • 2.2. as light as possible • SC.3. The device have to as possible as simple. • 3.1. easy to use (not complex) • SC.4. The device have to as possible as hard. • 4.1. bare quite strong impact • 4.2. use for a long time

32. Selection Criteria (SC) • SC.5. The device have to be made simple as possible. • 5.1. simple structure of piezoelectric crystal • SC6. The device have to as possible as good looking. • 6.1. attractive • 6.2. colorful • SC7. The device have to as possible as eco friendly. • 7.1. not to pollute environment • 7.2. contain as little amount heavy metal as possible • SC8. The device have to connect with other many device. • SC9. The device should have a high degree of efficiency.

33. Interview Questions • Mechanism of piezoelectric materials • The amount of energy gained from the piezo • Applications of piezoelectric materials in our lives • Efficiency and cost • The way to store energy produced by piezo • Methods to keep the brightness of the LED even • Whether the energy is enough for charging • Alternative energy source

34. Age • Over 30Possess a mobile phone • Possess an MP3 or any other music players • Which do you use more? • How long do you use a mobile phone a day? (any activity involving mobile phone) • How long do you use an MP3 a day? • Did you have any situations where you had a problem due to the battery running out for the above devices? • How much time do you spend a day to charge up your battery for the above device (The one you use more) • If the device could charge by itself, how much more are you willing to pay when you are purchasing it? • Which aspect of the mobile phone or mp3 do you look at when purchasing them?

35. Age • Have you ever used book light before • What kinds of characteristics do you look at for book lights? • How big do you think they should be? • How long do you spend outside? (Walking outside) • Up to how much are you willing to pay? • Have you had an experience where you could not read due to lack of light? • In what kind of environment do you read books? • For how long do you read books in a day? • In which position do you like to read books?

36. Introduction • The survey is for the Freshman Design Course at Kaist. The project is to design energy harvesters for portable electronic devices. This survey will mainly concentrate on the portable device being book light.

37. Book light: A device used to • Read texts with limited light source. • Energy efficient (LED lights) • Light and compact => transportation • Reading positions • Flexible

38. Mobile phone: A device used to • Make calls • Send text messages • Communicate with other people. • MP3: A device which allows the user to • Store • Listen to music and video.

39. As a team, you should meet and discuss your project topic and different aspects of that theme and the problem(s) that it represents •  “mechanical energy harvesters for portable electronic devices”. • harvest energy, benefit the public, environmentally and user friendly. • usage of certain electronic devices more convenient • efficient, affordable • Anywhere, any given time • Safe • Durable • provide energy for people who need it for electronic devices

40. Heating &Cooling System. • Artificial Heart • Bridge and other infrastructures • Lighted Clothing • Mobile phone • Torch • Park • Wireless devices • Lighting umbrella • Hand heater • LED writing • Glow-stick

41. Pro: Can use mobile phones in emergency situations. Less energy is used at home. Also it will affect a large number of people, so can make a great impact. Furthermore, the target market has a wide range making it a more general solution rather than a specific one targeted at a small group of people. • Con: It is hard to produce enough electricity for the mobile phone at nearly all of the times when it is required

42. used a lot=> many cases where the battery runs out and important calls must be made. • inconvenient. • main means of communication in the 21st century • benefit the public • emergency situations • saving power and being eco-friendly.

43. Stakeholder & Customer & User • Our problem: To work on making energy harvesters for mobile phones. • Requirements to design and produce the energy harvesters may be improbable for the given • Time • Skills • Funds • Market