Programmable Power Relay

1
Programmable Power Relay

• Mid-semester presentation

2
Team Members

• Jameson Mitchell
• Electrical Engineering
• PIC Programming
• GUI Design
• Schematic Design

• David Null
• Electrical Engineering
• TRIAC control
• Firmware Design
• Research and Documentation

• Rick Wolbrecht
• Electrical Engineering
• PIC Programming
• GUI Design
• Schematic Design

• Lane Simmons
• Electrical Engineering
• Team Leader
• Firmware Design
• Website Design
• Research and Documentation

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Introduction

• Whats the PPR supposed to do?
• Control device power using schedule
• Prevent schedule tampering
• Minimize need for user input after schedule is set

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Problem 

•  
• Current power strips have few features
• No programmable timing schedule
• No interactive user interface
• Few methods to exercise parental control over
  electronic devices.
•  

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Solution

•  
• "Smart" power strip with enhanced features
• Programmable Timing Schedule for AC-switching
• PC software application
• Parents will have ability to limit video game
  console use
• Possible Target Markets
• Automation
• Security

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Technical Constraints   

• Real time clock must operate at all times, under
  all power conditions
• Timing schedule accuracy must include Years,
  Months, Days, Hours, Minutes, Seconds
• PC is required to operate user interface
• Must supply power to internals from 120VAC
• Switching power must operate up to 120VAC at 15A
  (NEMA 5-15 Standard) 1

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Practical Constraints
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Health and Safety

• Must conform to Underwriters Laboratories (UL)
  standards for safety
• UL 758 standard for appliance wiring material
• Within the UL 758
• Construction
• Performance
• Thermal and Chemical property tests
• Electrical and Flame properties
• Manufacturing
• Labeling
• Production
• 2

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Economic

• Must be manufactured for less than 50
• Retail at 100
• Comparable products retail from 40 to 90
• Must be able to compete at a reasonable price
• Scheduling feature
• Operates without direct interaction from user

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Economic

• Isole Plug Load
• 90
• Requires user interaction
• Smart Strip Power Strip
• 40-50
• Requires equipment status interaction
•  3, 4

Isolé IDP-3050 Plug Load Control
Smart Strip Power Strip
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Technical Approach
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User Interface
13
Battery Backup
14
Microprocessor
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Power Switching
16
Power Supply
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Schedule
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Hardware Progress
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Triac and AC Enclosure
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Test Switching
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Software Theory

• PC GUI
• User friendly
• Does most of the work
• Designed to make firmware less complicated
• Firmware
• Lightweight
• High efficiency

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References

•     1 Powercords Online, "IDC Plugs -
  Standards," Online. Availible
  http//www.powercords.co.uk/standard.htm 
•    2 "Appliance Wiring Material, UL 758."
  Underwriters Laboratories. http//ulstandardsinfon
  et.ul.com/scopes/0758.html. Accessed September
  16, 2008.
•     3 Isolé IDP-3050 Plug Load Control.
  WattStopper.  http//www.wattstopper.com/products/
  details.html?id74category122typeCommercial.
  Accessed August 27, 2008.
•     4 Bits Energy Saving Smart Strips. Bits
  Limited. http//catalog.bitsltd.us/power_strips/.
  Accessed August 27, 2008.

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Questions ?