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Multiple-output, Variable-output DC Power Supply May03-22. Team Members: Erik Johnson Joel Jorgensen Peter Holm Philip Schulz Clients – Prof. Patterson, Prof. Lamont Faculty Advisor – Dr. Allan Potter April 30 th , 2003. Presentation Overview. Problem statement and solutions

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multiple output variable output dc power supply may03 22

Multiple-output, Variable-output DC Power SupplyMay03-22

Team Members:

Erik Johnson

Joel Jorgensen

Peter Holm

Philip Schulz

Clients – Prof. Patterson, Prof. Lamont

Faculty Advisor – Dr. Allan Potter

April 30th, 2003

presentation overview
Presentation Overview
  • Problem statement and solutions
  • Summary of activities
  • Resource requirements
  • Summary of progress
  • Questions
general problem statement
General Problem Statement
  • Develop a power supply with the following voltages: +1.5V,  3.0V, +3.2V, +4.5V,  5.0V, +6.0V, +7.5V, +9.0V,  12.0V, +15.0V, +18.0V, +24.0V
  • Output 2 + voltage outputs and 2 + voltage outputs simultaneously
  • Produce for a low cost (~$150)
  • Allow a maximum current of 1A through each set of terminals
solution approach
Solution Approach
  • Develop general design
  • Simulate and test on CAD program
  • Order parts
  • Assemble
  • Test
  • Modify and re-test if necessary
operating environment
Operating Environment
  • Standard laboratory conditions
    • Indoors
    • Approximately 24 degrees Celsius
  • Standard 120V, 60 Hz wall output
end users and uses
End Users and Uses
  • Users
    • Research and design students
    • Faculty
  • Uses
    • Power and test design projects
    • Produce a small current at many voltages
    • Provide several voltages simultaneously
assumptions and limitations
Assumptions and Limitations
  • Assumptions
    • All four outputs will be used simultaneously
    • Power supply will be used indoors at room temp
    • Power supply will be powered by 120V, 60 Hz
  • Limitations
    • Output current limited to 1A max per output
    • Total cost must be below $150
    • Input must be 120V at 60 Hz
end product description
End Product Description
  • 4 selectable output voltage terminal sets
  • Maximum current of 1A per output
  • Output voltage selected by rotary knobs
  • Digital readout of voltage, current and wattage
  • Fuses for power supply protection
present accomplishments
Present Accomplishments
  • Schematic simulated and successful
  • Successfully implemented transformer and bridge rectifiers on circuit board
  • Successfully implemented +/- voltages on circuit board
  • Examined methods of implementing positive only voltages
approaches to the design
Approaches to the Design
  • Recycle/modify/incorporate existing insufficient power supplies
  • Create and design an original power supply
    • Use store-bought voltage converters
    • Design and create voltage converters
      • Flyback converter
      • Buck converters
      • LM317T/LM337T voltage regulators
project definition activities
Project Definition Activities
  • The power supply specs were expanded from the original to include the following:
    • +3.2V, +7.5V, +15V, and +18V
    • 2 + voltage outputs and 2 + voltage outputs
    • Ammeter and voltmeter
research activities
Research Activities
  • The need for more voltage outputs was researched.
    • It was found that the additional voltages of +3.2V, +7.5V, +15V, and +18V would be useful for small home electronics
  • Also researched various power supply designs for ideas to implement in the final product.
lm317t lm337t voltage regulators
LM317T/LM337T Voltage Regulators
  • Adjustable output down to +1.2v
  • Adjustable current limiting feature
  • Line regulation typically .01%/V
  • Load regulation typically .1%
  • 80 dB ripple rejection
tl494 pwm control circuit
TL494 PWM Control Circuit
  • Up to 200 kHz oscillator frequency
  • Feedback allows voltage and current regulation
design activities
Design Activities
  • Different implementation schematics tested
  • Because the LM317T/LM337T voltage regulators are not in the Workbench/Pspice libraries, the circuits were physically tested
personnel effort budget

Team Members

Paper Work

Research

Design

Construction

Totals

Est.

Act.

Est

Act.

Est.

Act.

Est.

Act.

Est.

Act.

Erik Johnson

8

10

21

14 

32

 25

12

13

73

58 

Joel Jorgensen

5

27

25

13

34

26

13

14

77

 76

Peter Holm

9

25

15

7

25

22

14

8

63

58

Philip Schulz

7

10

18

8

28

27

12

12

65

53

Totals

27

72

79

 42

119

100

51

47

278

265 

Personnel Effort Budget

financial budget

Item

Original Estimated Cost

Cost to Date

Poster

$50.00

$50.00

Case

$14.99

$0.00

Transformers

$35.53

$21.94

Resistors/capacitors/diodes

$26.80

$21.18

Cooling fan

$9.99

$8.99

Switches, dials, and terminals

$25.00

$6.21

Meters ($10.25 each)

$30.75

$0.00

Variable voltage regulator

$4.00

$3.90

Total

$197.07

$112.22

Financial Budget

project evaluation
Project Evaluation
  • Done on a scale of: incomplete = 0%, to complete = 100%
  • Milestones:
  • Overall Status: Prototype
commercialization
Commercialization
  • Estimated cost to produce: $100 - $200
  • Estimated sales price: $400 - $1000
  • It is anticipated that this product would have a very large market
    • Versatile
    • Financially viable
recommendations for additional work
Recommendations forAdditional Work
  • Finish original implementation
  • Develop a commercial version
  • Add power factor correction
  • Make each set of terminals fully isolated
  • Make current limitation adjustable
lessons learned
Lessons Learned
  • What worked
    • Team worked well at brainstorming, designing
    • Advisor was helpful when we got stuck
    • Regular, scheduled meeting
  • What did not work
    • Collaborating on reports and poster
    • Weekly status reports
    • Ordering parts
    • Gaining the necessary knowledge
    • Advisor absence for extended period of time
lessons learned cont
Lessons Learned (cont)
  • Technical knowledge gained
    • How power supplies work
    • How DC-DC converters work
    • How transformers work
    • How to use Workbench
  • Things to do differently
    • Put more time into research early on
risks and risk management
Risks and Risk Management
  • Illness
    • Follow good health practices
    • Take on some of the sick member’s workload among the other members
  • Accidents such as electrocution or fire
    • Follow high voltage safety procedures when assembling
    • Cut power, use First Aid, call 911, put out fire
  • Losing a team member
    • Be such a good team that nobody wants to leave
    • Divide the work among the remaining members, seek assistance from colleagues
summary
Summary
  • Problem: Replace the current power supplies with a single versatile tool
  • Approach: Consider several different alternatives by which multiple voltages can be provided simultaneously by a single power supply
  • Solution: Provide two plus/ground terminals and two plus/minus/ground terminals whose voltage can be set independently of the others. Also provide meters to display the voltage, current, and wattage of the selected set of terminals