Mobile%20Device%20Charger%20Sponsored%20by

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Mobile Device ChargerSponsored by
System Level Design Presentation 12.07.06

• Liaison Len Horey
• Coach Wenhsing Wu
• Team Alex Rodriguez
• Bryan Talenfeld
• Niraj Patel
• Peter Flores
• Pree Silva

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Project Background

• Develop a device to charge the following common
  handheld electronics
• Cell phones
• PDAs
• MP3 players (especially iPods)
• Primary Customer Needs
• High value to end-user
• Easy to use
• Minimum liability
• Minimum number of attachments
• Major Constraints
• Avoid patent infringements
• Strive to cover 80 of market

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Previous Accomplishments

• Verified need for product
• Identified end-user habits and practices
• Established target device market
• Identified device brands that will cover desired
  market share of 80
• Categorized devices by voltage and current inputs
• Created patent database
• Compiled relevant active patents
• Established simple summaries for ease of use

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Current Accomplishments

• Acquired extended knowledge of chargers
• Reverse engineered similar chargers
• Completed external research
• Completed hardware design
• Revised concept
• Circuit design and schematics
• Prototype Plan
• Testing Plan

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Current AccomplishmentsRevised Concept

• Must withstand
• Temperature 50 to 90 degrees Fahrenheit
• Humidity 25 to 95 RH
• Constant use and possible abuse

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Current Accomplishments Hardware Connections
Mobile device (cellphone)
Wall (AC)
Overcharge Protection
USB Port
Device Adapter
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Current Accomplishments Circuit Design and
Schematics
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Current Accomplishments Overcharge Protection

• This circuit has the goal of protecting the
  device from overcharging
• Still under development
• to achieve ideal conditions

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Prototype Plan

• Assembly
• The Prototype is divided into two parts
• DC supply
• AC ? DC using transformer, Wave rectifier and
  voltage regulator. DC voltage at the USB
  receptacle
• Attachment
• The USB connector is followed by charge
  termination circuit and then connected to device
  connector through a wire.
• Testing
• DC supply
• For voltage and current available at USB output
• Attachment
• For functionality of the charging termination
  circuit. Also test its functionality with
  computer USB ports.

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Prototype PlanParts, Quantity and Cost
Estimated Cost of DC Supply 11.76 Estimated
Cost of Attachments 1.94
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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Testing PlansQuality/Reliability Objectives

• Meet company specifications
• Meeting company/government standards for quality
  and reliability
• Assuring that the components and sections of the
  product are reliable under stressed conditions.
• Testing product for previously stated condition
• Product Maltreatment Test

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Testing PlansProduct Maltreatment Test

• This is designed to test the durability of the
  prototype.
• The test involves the following
• Pulling the attachment cord when phone is
  connected
• Trying to force wrong attachment into the phone
• Verifying part life by running various short and
  long term tests.

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Testing PlansProduct Verification Plans

• The hardware of the product will be main focus
  when running verification tests.
• No software is required in our product minimizing
  the testing needed for hardware/software
  integration.
• The following testing procedures will be used to
  test the product
• Test Battery Condition
• Charge Regiment Test

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Issues

• Attachments
• The team has not been able to find a vendor for
  the cell-phone, PDAs and MP3 player connectors
  needed to connect the charger to the mobile
  devices.

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Agenda

• Project Background
• Previous Accomplishments (up to PDR)
• Current Accomplishments (since PDR)
• Revised concept
• Circuit Design
• Prototype Plans
• Testing Plans
• Issues
• Next Steps
• Questions

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Next Steps

• Order Components 12/11/06
• Independent work 12/11-01/08
• Receive Components 01/08/07
• Prototype Build Start 01/10/07
• Prototype Build End 01/22/07
• Testing/ Debugging Start 01/22/07
• Testing/ Debugging End 03/01/07

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Questions
Peter
Bryan
Alex
Pree
Neil