Transcript Powerpoint - ECpE Senior Design

PIC Battery Charger
Team SD May03-05
Abstract
Many of today's new electronic devices require rechargeable batteries to function. To be practical, a battery charger should support 120V AC, 220V AC, 50-60
Hz or 12V DC car inputs and be portable. Many companies have produced battery chargers that do one or two settings, but very few have all three voltages
and current frequencies. Therefore, the team decided to research the current knowledge concerning rechargeable batteries and design a battery charger
based on quality and usability principle.
Members
Clients
Design Objectives
Richard Musumhi (EE)
Prof. John Lamont
(Advisor & Client)
Develop a battery charger that can
Prof. Ralph Patterson
(Advisor & Client
• Charge batteries intelligently using profiles.
Pascal Openshaw (CprE)
Bo Bo Oo (EE)
• Use U.S., European, and vehicle outlet types
Chris Privitere (CprE)
Functional Requirements
General Background
Very few battery chargers are capable of using electrical
outlets from the U.S., Europe, and car adapters
interchangeably and detecting when to stop charging a full
battery.
●
Use 120V/60Hz, 220V/50Hz, or 12V DC outlets
●
Detect the fill on batteries
●
Vary the charging current based on battery details
Technical Problem
Create a battery charger that can
• Use multiple kinds of electrical outlets
• Vary the charge based on battery fill
Design Constraints
Operating Environment
Meant for use inside a house or automobile.
Size and weight of the charger must make it easily
portable
Intended users and uses
Measurable Milestones
Designed for frequent travelers who constantly need
charged batteries for portable electronic devices.
• Project Definition
• Implementation
• Technology Selection
• Demonstration
Limitations
• Design Document
• Documentation
• AA and AAA NiCad and NiMH batteries only
End-Product Description
• No more than 4 batteries at a time
Cash Budget
• Capable of charging up to four AAA/AA size NiCad or
NiMH batteries
• Using either a car adapter or wall outlet from U.S. or
European countries
• Small and light enough to fit in a travel pouch
Sample
commercial
battery charger
Personnel Effort Budget
Testing Approach
• Power testing
- voltage test
- current test
- charging status test
•Usability testing
- batteries should not burn out
- charging time limit
- overcharge and undercharge
- discharging