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Programmable Power Relay Final presentation Team Members Jameson Mitchell Electrical Engineering David Null PC to PIC communication Electrical Engineering GUI Design TRIAC control Schematic Design Firmware Design Research and Documentation Lane Simmons Rick Wolbrecht Electrical Engineering Electrical Engineering Team Leader Packet Encoding Firmware Design GUI Design Website Design Schematic Design Research and Documentation Overview • Introduction • Problem • Solution • Technical Constraints • Practical Constraints • Hardware Evaluations • Software Evaluations Introduction What’s the PPR supposed to do? • Control device power using schedule • Allow automated control • Minimize need for user input after schedule is set + Problem • Current power strips have few features No programmable timing schedule No interactive user interface No dimming capability Few methods to exercise schedule control over electronic devices. Unable to control power when away from device Solution • "Smart" power strip with enhanced features o Programmable Timing Schedule for AC-switching o PC software application • Possible Target Markets • Automation • Security 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)  Practical Constraints Health and Safety • Must conform to Underwriters Laboratories (UL) standards for safety o UL 758 standard for appliance wiring material o Within the UL 758 Construction Performance Thermal and Chemical property tests Electrical and Flame properties Manufacturing Labeling Production  Economic • Must be manufactured for less than $50 o Retail at ~$100 o Comparable products retail from $40 to $90 o Must be able to compete at a reasonable price o Scheduling feature o Operates without direct interaction from user Economic •Isole Plug Load – $90 – Requires user interaction •Smart Strip Power Strip – $40-50 – Requires equipment status interaction ,  Isolé® IDP-3050 Plug Load Control Smart Strip Power Strip Technical Approach Hardware Tests • Power Supply • Power Controller – TRIAC Controller – TRIAC • Microcontroller • Firmware – Flash Writes – Sort and Execute • Zero Crossing • RTCC – Battery Backup Power Supply (120 VAC/5 VDC Converter) TRIAC Controller and TRIAC  TRIAC Controller and TRIAC Microprocessor and Firmware PIC24HJ Microprocessor Packet Transmission Testing Zero Crossing Circuit Zero Crossing IC Zero Crossing and TRIAC Control Oscilloscope readings Zero Crossing Control TRIAC Control Oscilloscope readings Real Time Clock and Calendar RTCC Circuit RTCC to Microprocessor I2C Bus Oscilloscope Reading Real Time Clock Output Windows Clock Output Software Tests • Write events to text file • Confirm Serial Port I/O • Confirm Conversion Method Text File Test • Enter Event into GUI • Event is saved to text file Text File Test • Text file data is loaded into memory upon opening of application Serial Port I/O Test • Send packet via serial port Conversion Test • Convert Event class data into packet format Conversion Test Conversion Test Completed Prototype PPR System Test Future Work • Multiple Outlets • LCD Status Display • Repeat Event Processing • Perfect Dimming Feature Questions ? References • Powercords Online, "IDC Plugs - Standards," [Online]. Availible http://www.powercords.co.uk/standard.htm • "Appliance Wiring Material, UL 758." Underwriters Laboratories. http://ulstandardsinfonet.ul.com/scopes/0758.html. Accessed September 16, 2008. • “Isolé® IDP-3050 Plug Load Control.” WattStopper. http://www.wattstopper.com/products/details.html?id=74&category=122 &type=Commercial. Accessed August 27, 2008. • “Bits Energy Saving Smart Strips.” Bits Limited. http://catalog.bitsltd.us/power_strips/. Accessed August 27, 2008. • “6-PIN Dip Random Phase Optoisolators Triac Driver Output.” Programmable Power Relay Datasheets. http://www.ece.msstate.edu/courses/design/2008/smartcord/downloads/MOC3011- M.pdf. Accessed December 1, 2008.
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