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ECE 345 - Senior Design Project. A Better Uninterruptible Power Supply (UPS) Jason Fontaine Jon Rasmussen. Why a better UPS?. Simplification of AC/DC conversions Less conversions leads to higher efficiency Increased speed and reliability Direct input into a computer’s power supply.

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ece 345 senior design project

ECE 345 - Senior Design Project

A Better Uninterruptible Power Supply (UPS)

Jason Fontaine

Jon Rasmussen

why a better ups
Why a better UPS?
  • Simplification of AC/DC conversions
    • Less conversions leads to higher efficiency
  • Increased speed and reliability
  • Direct input into a computer’s power supply
how the design operates
How the design operates
  • Direct DC from UPS to power supply eliminates one DC/AC and one AC/DC conversion
  • Diode provides nearly instantaneous switching
  • Backup power always present behind diode
system diagram
System Diagram

120 V AC Source

10:1 Transformer

Rectifier/

Battery Charger

DC/DC (Flyback)

Converter

12 V Battery

360 V DC output

Diode

DC Bus of PC

Power Supply

rectifier charger
Rectifier/Charger
  • 12 V, 20 A battery
    • Similar to common motorcycle battery
  • Battery tolerant to input variations
    • Rectified signal can be rough
  • Charging time a non-issue
    • Battery under constant charging
gate drive
Gate Drive
  • Using Pulse Width Modulation IC
    • UC 3843 PWM
  • Frequency Control
    • 10 kHZ - 500 kHZ
  • Duty Ratio Control
    • 0 % - 100%
why the flyback converter
Why the Flyback Converter?
  • DC/DC Converters function like AC transformers
  • Can use single input to supply several different output voltages
  • Offer high degree of efficiency
  • Ability to create a larger “boost”
    • Turns ratio vs. duty ratio
  • Less demand for duty ratio accuracy
  • Does not require a common ground
    • Provides an isolated output
project specifications
Project Specifications
  • AC Source Input Voltage: 120 V AC
  • DC Source Input Voltage: 12 V DC
  • DC Output Voltage: 326 V DC
  • Output Power: 240 Watts
  • Output Ripple: <5%
  • Input frequency: 50kHz
  • DC Source Input Current: 20 A DC
  • Output Current: 0.74 A DC
  • Converter Efficiency: >85%
cost and time analysis
Expected cost parts

$30

Expected cost time

140 hrs

$8750

Grand total expected

$8780

Actual cost parts

$69

Actual cost time

144 hrs

$9000

Grand total actual

$9069

Cost and Time Analysis
project conclusions
Project Conclusions
  • Performance
    • Achieved correct design
    • Circuit behavior acceptable (at low output power)
  • Budget
    • Reasonable end total
    • Must allocate research funds in future
post project conclusions
Post Project Conclusions
  • Ideal design well understood
  • Realized impact of non-ideal effects
  • Implementation far more difficult than anticipated
  • Learned value of design simulation
project future
Project Future
  • Resolve temperature effects
  • Reduce inductor size
  • Package the circuit, add interfaces
  • Direct tap into DC bus of PC power supply
  • Provide backup power for display
future for project team
Future for Project Team
  • Arkansas Valley Electric Co-op
    • Ozark, Arkansas
  • The RMH Group
    • Denver, Colorado
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