Electroluminescent Logo Cap Project Team # 10 Milestone # 3 –System-Level Design Review Faculty Advisor/Reviewers: Dr. Michael Frank Dr. Bing Kwan Dr. Rajendra Arora Team Members: Monica Pereira Monique Peregrina Liang Liufu Ifedayo Ogundana Sponsored by: Albert Daci
Electroluminescent Logo Cap Project. Team # 10 Milestone # 3 –System-Level Design Review. Team Members: Monica Pereira Monique Peregrina Liang Liufu Ifedayo Ogundana. Faculty Advisor/Reviewers: Dr. Michael Frank Dr. Bing Kwan Dr. Rajendra Arora. Sponsored by: Albert Daci. - PowerPoint PPT Presentation
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Electroluminescent Logo Cap Project
Team # 10Milestone # 3 –System-Level Design Review
Faculty Advisor/Reviewers:Dr. Michael FrankDr. Bing KwanDr. Rajendra Arora
Team Members:Monica PereiraMonique PeregrinaLiang LiufuIfedayo Ogundana
Sponsored by:
Albert Daci
Monica Pereira
2Introduction/Overview of the Project
• The purpose of this project is to design an original cap that implements electroluminescent technology. This cap will consist of a panel with flashing capabilities and with a hidden internal circuit.
• Each cap will implement a switch with three states (turn on, flash, turn off) and be provided with an internal circuit with water resistant capabilities. In addition, the cap will come with a micro-USB charger hidden underneath the bill of the cap.
3
ADDITIONAL CONCEPT GENERATION & SELECTION
Monica Pereira
4Prototype ConceptFront View Internal View
Monica Pereira
5Overall Design Components
• Fitted baseball cap• LiPo rechargeable
battery • Battery charger• 10cm x 10cm EL panel• 3V DC battery inverter• IC chip• Liquid Encapsulating
epoxy resin
Reference No.
Description Component fulfilling this requirement
REQN-001
The design must be able to light on, blink and turn of.
Timing IC
REQF-002 Use slim batteries that maximize the prototype efficiency
Li-Po rechargeable battery & battery charger
REQN-004
REQN-006
Components will be water resistant Design will withstand common wear and tear.
Epoxy resin encapsulating material
CAP-001
REQF-004
Panel must be able to turn on continuously, blink and turn off. A miniature button switch should be implemented in the bill to turn on/flash/turn off the EL logo.
Blinking will be fulfilled through the timing IC The three operating modes will be operated through the single pole, triple-throw switch
Monica Pereira
6
Component selectionThe following components have remained the same:
The LiPo Charger Basic uses a Microchip MCP73831T-2ACI/OT charge management controller to charge 3.7V Li-Po batteries at a rate of 500mA per hour.The board incorporates a charging circuit, status LED, connector for your battery (JST type), and USB connector. A small mounting hole allows this charger to be embedded into a project easily.
• More components may be neededProbability – moderate Consequence – minorStrategy – some funds are reserved
• Damaging the timer IC and/or the inverter Probability – low Consequence – severe Strategy – funds are reserved for purchase of extra major components
• Unaccounted-for-costs Probability- lowConsequence - moderate, Strategy – low price components are purchased and expenses are cut down
• Budget limitations Probability – low Consequence – moderate Strategy – component parts are ordered to together to reduce cost of shipping.
34CURRENT EL CAP REPLICATION BUDGET (CUSTOM INVERTER)
35Updated Schedule
Monica Pereira
36
Thank You!Questions ?
Monica Pereira
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EXTRA SLIDES FOR REFERENCE
38
Item Test Methods Performance
Over charge
At 20±5°C charging batteries with constant current 3A to voltage 4.8V, then with constant voltage 4.8V till current decline to 0. Stop test until batteries temperature is 10 degrees lower than max temperature.
No explosion or fire
Over discharge At 20±5°C discharge battery with 0.2A continuously 12.5h. No explosion or fire
Short-circuit At 20±5°C connect batteries’ anode and cathode by wire which impedance less than 50mΩ, keep 6 h
No explosion or fire
Thermal shock
Put the battery in the oven. The temperature of the oven is to be raised at 5±10 degrees per minute to a temperature of 130degrees and remain inside the oven 60 minutes.
No explosion or fire
Safety TestTest conditions: The following tests must be measured at flowing air and safety protection conditions. All batteries must standard charge and lay 24h.
Li-Po Battery Performance
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Cautions of charge & dischargeChargeCharging current should be lower than values that recommend below. Higher current and voltage charging may cause damage to cell electrical, mechanical, safety performance and could lead heat generation or leakage.Batteries charger should charging with constant current and constant voltage modeCharging current should be lower than (or equal to ) 1ACharging voltage must be lower than 4.25VDischargeDischarging current must be lower than (or equal to )2ADischarging voltage must not be lower than 2.75V.Over-dischargeIt should be noted that the cell would be at an over-discharge state by its self-discharge. In order to prevent over-discharge, the cell shall be charged periodically to keeping voltage between 3.6-3.9V.
40
Supply Current - Current in mA/cm2 versus supply voltage:
As the supply current is increased for the EL panel, the supply voltage also increases.
EL Panel Specs
41
Brightness Vs Timewith time.
Unlike most other lighting which can critically fail, EL Panel brightness decreases with time.
The following factors have an impact on lifetime:• Higher Voltage• Higher Frequency• DC Supply• High Ambient Humidity• High Ambient TemperatureBrightness can be increased by using a higher voltage or higher frequency.Higher voltage slightly decreases life time, but is preferred if higher supply current can be accepted.
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EL Panels emit light from 50VAC and increase in brightness with higher voltage up to 200VAC. The frequency should be over 50Hz. Brightness increases with higher frequency up to 1000Hz. However, it is recommended that frequencies in the range of 400-600Hz and voltages of no greater than 160VAC are used, otherwise the panel life will rapidly deteriorate.