Multiple-output, Variable-output DC Power Supply May03-22

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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 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
• Problem statement and solutions
• Summary of activities
• Resource requirements
• Summary of progress
• Questions
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
• Develop general design
• Simulate and test on CAD program
• Order parts
• Assemble
• Test
• Modify and re-test if necessary
Operating Environment
• Standard laboratory conditions
• Indoors
• Approximately 24 degrees Celsius
• Standard 120V, 60 Hz wall output
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
• All four outputs will be used simultaneously
• Power supply will be used indoors at room temp
• 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
• 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
• 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
• 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
• 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
• 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
• Adjustable output down to +1.2v
• Line regulation typically .01%/V
• 80 dB ripple rejection
TL494 PWM Control Circuit
• Up to 200 kHz oscillator frequency
• Feedback allows voltage and current regulation
Design Activities
• Different implementation schematics tested
• Because the LM317T/LM337T voltage regulators are not in the Workbench/Pspice libraries, the circuits were physically tested

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

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
• Done on a scale of: incomplete = 0%, to complete = 100%
• Milestones:
• Overall Status: Prototype
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
• Finish original implementation
• Develop a commercial version
• Make each set of terminals fully isolated
Lessons Learned
• What worked
• Team worked well at brainstorming, designing
• 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)
• 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
• Illness