Lamp Head Designs

Hey guys,

Here are some of the designs I came up with. Any suggestions/ideas??

- Elliot -

LED Specs from the manufacturer:

CREE High Power - Tao source of an electronic agent. CREE High Power Products:

1.cree high power led Q5 is white, the color temperature :5700-7000K (WC, WD, WF, WG) Model: XREWHT-L1-Q5 cree led warm white temperature :2600-3700K, warm white natural :3700-5000K, other colors, red, green, blue, yellow. Model: XRE, XRC, XPE, XPC, MCE series.
2. Luminous flux of up to 114LM / W.
3. The normal working current: 350mA-700mA, 700mA at work when the flux is 1.65 times the work of 350mA maximum support, 1000mA
4. Typical voltage 3.2V (350Ma), 3.5V (700mA)
5. CLASS II,> 2000V
6. Typical viewing angle 90 °, 110 °, 115 °
7.1000 is less than small-time decline 0.5% (350mA, Ta = 25 degrees,)
8.50000 small-time decline of less than 30% (350mA, Ta = 25 degrees,)
9. Meet the ROHS requirements.
10. Thermal resistance within the lowest in the industry: 8 ℃ / W
11. The world's leading JEDEC standards for pre-test
12. Can be reflow line-JEDEC, J-STD-020C standard,
13. Cooling section is not electrically charged.
14. To provide tailor-made aluminum plate (special specifications) tailor-made, (ie, zone plate) LED reflow processing and other supporting services.
15. Application: LED lamps, automotive lighting, stage lighting, mobile phone backlight, architectural lighting, solar lighting, military flashlight; to provide tailor-made aluminum plate (special specifications) tailor-made, (ie, zone plate) LED reflow processing and other support services .

Generator Report

Below is the executive summary from our final report for the generator. I am unsure on how to attach the entire report, which including the appendices and table of contents is about 45 pages long. I have it in both Microsoft word and pdf format. If anyone knows how to upload a pdf or word document please let me know. I can also email it to people individually.

-Liz

The purpose of this report is to present our findings regarding our manually powered generator design for charging cellphone batteries to M-Heal, the student organization we collaborated with. This report presents our prototype design and prototype tests. Because our prototype design did not generate enough electricity to charge the cellphone batteries, our report also discusses changes that should be made to our generator design in order to successfully charge cellphone batteries.

M-Heal had previously designed a surgical lamp which operated using cellphone batteries in order to provide reliable lighting in Ugandan operating rooms. Currently, the cellphone batteries must be charged using electricity from a power grid; unfortunately, Uganda’s power grids are unreliable. Consequently, a surgeon can be left without lighting during surgery.

Our solution was to design a manually powered generator that could charge the ten cellphone batteries. As part of our task, we followed the criteria established by M-Heal as well as criteria we devised after considering the problem. These criteria included using sustainable parts, ease of construction, and ease of operation.

The main parts of our generator prototype were obtained from used automobiles, cellphones, and bicycles. Our research indicated that these used devices are available in Uganda and allow our design to be constructed and maintained in Uganda. Our prototype design consisted of three main components, the generator, the circuit system, and the stand. The circuit system contained two circuits; the first circuit used the energy our generator produced to charge a car battery and the second circuit charged the cellphone battery using the stored electricity in the car battery.

Prototype testing revealed that the amount of electricity we generated was insufficient to charge the cellphone batteries. From the results of our voltage test, we concluded that the voltage that our prototype produced was too low to charge the car battery. Because we could not charge the car battery, we were unable to charge the cellphone batteries.

Based on our research and tests, we have devised several design improvements. These recommendations are mainly concerned with the electricity output of our generator. We propose to optimize the AC voltage produced by our generator by adding more magnets to the wheel, moving the steel core closer to the bicycle wheel, and adding more wire coils to the core. In order to prevent the high voltage losses after rectification, we also suggest using a more efficient rectifier.

While we did not meet our criteria of charging ten cellphone batteries, we did create a working generator out of parts which are sustainable materials in Uganda. We recommend that a future team continues our work and improves the design of our generator in order to successfully charge the cellphone batteries.

Meeting Summary 1/24

Hi everybody,
Today's lamp meeting was just a overview of the project for our new team members and some general brainstorming. The major goals of this semester will be to build a new lamp head, build a new generator prototype, and create a more specific business plan. We need to have the next prototype ready to send with the Nicaragua team for their trip in June.

Action Items:
Liz: Post a summary of the engin 100 generator project on the blog
Melissa: Learn about the physics of generators
Pat: Think of reasons why the current generator prototype isn't very efficient
Elliot: Draw up two designs for the lamp head


The Lamp Team Blog:
Here's the url for the lamp team blog. If you have any interesting ideas or see any interesting articles please post on it. You should also post the results of whatever action items you're working on between meetings. The url for the blog is http://mheal-lamp.blogspot.com/.

Survey Team Lamp Results:
The results from the survey team's surveys are attached to the email I sent out today. If you haven't read them over yet I suggest doing so.

Next Week:
The next lamp team meeting will be on Tuesday directly after the M-HEAL general body meeting (so around 8pm), once again in the project room. We will look at the waveforms of the current generator and discuss improvements to the design. We will also discuss new head designs.