Portable Rechargeable Output Power Supply (PROPS) Final Presentation April 24, 2008.

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Presentation transcript:

Portable Rechargeable Output Power Supply (PROPS) Final Presentation April 24, 2008

Team Members Daniel Evans Shane Morrison Drew Mills Josh Gentry

Outline: Introduction Problem Statement SolutionConstraintsOperationTestingConclusionReferences

Problem Commercial Power Supplies: –Not Portable Bench top and Stationary Can only be used where AC is available Relatively large and heavy

Solution Portable Power Supply –Lightweight and Portable –Rechargeable –Variable outputs –Large display to show voltage and current output

Proposed Layout

Top Level Diagram

Technical Constraints Variable output from 1-12 volts ‒ 0.1 volt increments Tracking output from -10 to 10 volts Current up to 3.5 amps Output Ripple Voltage less than 5% Output error no greater than ± 50mV Runtime of 1 hour at full capacity

Practical Design Constraints Economic –Manufactured for $ Built in Power Supply Rechargeable Battery Display Screen –Marketed for $250.00

Practical Design Constraints Manufacturability –Size 14” x 9” x 7” –Weight < 10 pounds < 10 pounds –Durability

Operation Battery/Charger Outputs Voltage and Current Sensing

Operation (battery/charger)

Battery Specs – – mA/h Charger Specs – –MAX1873 Input voltage up to 28 volts Charge up to 4 cells Charge up to 4 amps

Operation (battery/charger) Battery Charging

Operation (battery/charger)

Operation (Output Circuits) Operation of Circuits – –DC/DC converters – –Linear Regulators

Operation (1-12 volt output)

Operation (Tracking output)

Operation (Current Monitoring) Hall-Effect Sensor ACS713 – –Monitors Current

Operation (Current Monitoring)

Operation (Software)

Video

Testing (battery/charger) Vin (V)Vout 1Iout 1Vout 2Iout 2 Time (min) Battery Lifetime Test

Testing (battery/charger)

Testing (1-12 volt output) 1 – 12 volt test data Voltage (measured) Voltage displayed on LCD% Error Difference (V) Average:

Testing (Positive Tracking output) Positive 1.5 – 10 volt Voltage (measured) Voltage displayed on LCD% Error Difference (V) Average:

Testing (Negative Tracking Output) Negative 1.5 – 10 volts Voltage (measured)Voltage displayed on LCD% ErrorDifference (V) Average:

Testing of Output Current Applied Current with Power Supply (read with Fluke) Current displayed on Display% Error

Testing Output Ripple

Testing (LCD) LCD RS and R/WLCD Enable and DB7

Testing (Rotary Encoders ) Rotary Encoder Signals

Testing (Digital Pots) I2C lines to Digital Potentiometers

Results vs. Constraints ConstraintPassFail 1-12 Volt Output Tracking Output Output Current Output Ripple Output Error Runtime

Future Implementations Rotary Encoders Digital Potentiometers DC/DC Converter

Future Implementations (Digital Pots)

Future Implementations (Rotary Encoders)

Design II Goals Change prototype from a Linear Power Supply to a Switching Power Supply Integrate new Digital Potentiometers into PROPS Integrate Rotary Encoders PCB layout

Questions