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Design Guide A Batteryless Cell phone 6/20/2006
Project Objective • Objective • Design a practical batteryless cell phone • Motivation • Take your cell phone anywhere for any length of time and never worry about recharging it • Never allow your cell phone to run out of battery • Never bother with your phone charger Got interested?
Project Challenges • Which technology to choose • Scaling the design to the proper size • Meeting proper power and voltage requirement • Storing sufficient energy
Design Guidelines • Understanding the cell phone requirements • Choosing a technology • Designing the electrical generator • Fitting the design mechanically • Testing the design • Documenting the design
Design Guidelines Cell Phone Requirements Power and Voltage Requirements Size and shape requirements Electrical Mechanical Electrical Design Evaluating mechanical requirement Testing the design Ensuring the electrical can properly fit Testing the Design Documenting the results Modify the design as needed Documenting the Design
Cell Phone Requirements • Electrical • Power and voltage requirements per call • Power storage requirements • Mechanical • Phone size • Available space
How to generate electricity Solar Type: Shine-and-call Advantage: Easy; Small Disadvantage: Needs sun; Works outdoor only Mechanical Types Shake-and-call Crank-and-call Pump-and-call Advantage: More practical Disadvantage: Large size What else? Understanding the technology Basic theory How the technology works Technology limitation Voltage, Power, Current Energy storage technology How much is sufficient How to store energy Power stability Does it always work? Size, durability, reliability, etc. Alternative Technologies
Design Steps • Designing the electrical generator • Providing sufficient power requirement • Offering proper storage capacity • Regulating the voltage into the system • Offering sufficient stability • Implementing the design mechanically • How to mount the design on the phone • Implementing the design using CAD
Testing the Design • Reliability • Always works! • Compatibility • Used for different phones • Lifetime • Storage capacity • Durability • Handing tolerance • Automation • Using LabVIEW and DAQ systems
Documenting the Design • Describing the theory • Showing the simulation results • Including the CAD plots • Design test results • Future works and improvements
References • http://en.wikipedia.org/wiki/Electrical_generator