Client: Department of Electrical and Computer Engineering at ISU Advisor: Professor R. Patterson III Team Members: Daniel J. Marquis (EE – 1 st ) – team.

Slides:

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Presentation transcript:

Client: Department of Electrical and Computer Engineering at ISU Advisor: Professor R. Patterson III Team Members: Daniel J. Marquis (EE – 1 st ) – team leader Hong Nguyen (EE – 2 st ) December 9, 2003 Power - Ongo-01c

Definitions DC/DC Power Supply – DC Voltage ‘A’ to DC Voltage ‘B’ DC/AC AC/DC Power Supply – DC Voltage ‘A’ to AC 120V – AC 120V to DC Voltage ‘B’

Presentation Outline Introduction – to power sub team project Project Activities – past, present, future Resources & Schedules – where we are Conclusions – results & implications

Introduction

Problem Statement Primary Problem – Inefficient DC/AC AC/DC Secondary Problem –Sensors wall powered Tertiary Problem – Maintenance / Support

Intended Users & Uses Users – OSCAR team members (Software, Sensors, and Motion Control) Uses – Power OSCAR during demos (The power system is not intended to provide power to non-related devices like home theater systems, full fledged desktop computers, electric lawn mowers, and halogen lamps.)

Assumptions and Limitations Short Demonstrations Sensitive Power System Isolation Limited Battery Power

End Product(s) DC-DC power supply system for computer Power budget for OSCAR Onboard power supply for sensors (either temporary or permanent)

Project Activity Description

Previous Accomplishments DC/DC Converter Designed (Spring ‘02) DC/DC Converter Constructed (Fall ’02) Battery Sensors Installed (Fall ’02)

Present Accomplishments DC/DC Testing Commenced Power Budget Made Documentation updated & posted on web Concluded DC/DC not up to spec.

Future Required Activities Maintain Power System (ongoing) Improve Fusing (Spring 2004 & ongoing) Commercial Power Supply Evaluation (Spring 2004)

Approaches Considered and the One Used Sensor Power - Rechargeable Battery Pack - DC/AC/DC Conversion Setup - DC/DC Converter (  Future) - Run off of PC (  Used Now)

Project Definition Activities Not Applicable

Research Activities Not Applicable

Design Activities Not Applicable (though did improve the previous term’s team’s documentation)

Implementation Activities Not Applicable

Testing and Modification Activities Tested DC/DC Power Supply Tested old DC/AC AC/DC System

Other Significant Project Activities Found DC/DC Converters Created & Posted Documentation Replaced 3 DC/DC Voltage Regulators (one exploded during a DC/DC power up) Repaired Fried Traces on PC Boards

Charging the Batteries

The DC/DC Supply Box

Two DC/DC Converters Inside Box

DC/DC Converters Outside of Box

Power/Motor Deck Setup

Website:

Resources & Schedule

Resource 1/2 Current Hours Original Estimate Revised Estimate Daniel J. Marquis Hong Nguyen Time (as of 7 December 2003)

Resource 2/2 Money (as of 7 December 2003) ItemEstimatedActualDifference (Estimated-Actual) Project Poster (Cost to Sub-Team)$50.00$6.00$44.00 Fuses$0.00$3.00-$3.00 Voltage Regulators$0.00 TOTAL$50.00$9.00$41.00

Schedule TaskFrom Day MonthTo Day MonthLength of Time (total day) Provide Temp Power Research testing circuit (DC/DC) Testing DC/DC circuit Research testing circuit (Monitor Battery) Testing Monitor Battery Provide Power Behind due to DC/DC failures

Conclusion

Project Evaluation MilestonePriorityCompletion DC-DC Converters FoundHigh 100% Power Budget CreatedHigh 30% Battery Status VerifiedHigh 100% Fuse Protection Implemented / VerifiedHigh 25% DC-DC Converters TestedMedium 80% Battery Indicators VerifiedLow 0% Temp Sensor Power Solution ResearchedLow 25% Temp Sensor Power Solution Built and InstalledLow 90% Temp Sensor Power Solution TestedLow 90%

Recommendations for additional work Inline, Accessible Fuses Commercial DC/DC

Summary DC/DC DC/AC AC/DC Documentation Commercial Solution