Group 9 Energy Harvesting

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Group 9 Energy Harvesting
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Week 7 Agenda

• Gantt Chart
• Tasks Accomplished
• Final Paper Outline
• Technical Report
• DC Voltage Freq. Analysis
• Power Analysis
• Environmental Testing Spectrum Analysis
• Summary

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Gantt Chart
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Tasks Accomplished

• Received parts and re-assembled circuit
• Modified transducer weightings
• Power analysis using shaker table
• Matched load for maximal power
• Environmental testing with energy harvesting
  circuit
• Continued documentation

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Final Report Draft Outline

• Executive Summary
• Abstract
• Introduction
• Background and Related Work
• Component Design and Analysis
• Implementation
• System Overview
• Hardware Selection
• Results and Analysis
• Conclusions
• References
• Statement of Work Check off
• Cost List
• Appendices

6
PZT Circuit Modifications
Adjusted Mass to Individual Transducers

• Added 0.60 gram washers to each transducer
• Originally 0.80 grams
• Increased resonant frequency
• From 33Hz to 45Hz
• Improved output characteristics

(Load 4.2 Ohm Resistor)
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Frequency Response(Acceleration Force 0.081
Gs)
At Resonant Frequency 45 Hz
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Force Response
Acceleration Range (0.016 0.100 Gs)
At Resonant Frequency 45 Hz
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Load Matching for Maximum Power Transfer
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Power Analysis(Acceleration Force 0.081 Gs)
RMaxPower 530 kO
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Frequency Response with Maximum Power Load (530
kO)
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Testing Results and Conclusions

• Increase in resonant frequency improves power
• 45 Frequency Increase ? 300 Power Increase
• Theoretical Power Density 330 uW/cm3
• Calculated volume of PZT material 0.2854 cm3
• Maximum power output of 94.1174 uW
• Maximum Power Achieved (_at_ 45 Hz)
• Optimal Coupling of 530 KOhms Load Resistance
• Pmax 86.7 uW 92 of maximum theoretical level

Value taken from Shad Thesis Paper
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Transducer Application

• Pico Radio
• UC Berkeley Project
• Solar Powered
• 1.9 GHz radio transmitter
• Power Consumption 50uW-100uW
• At resonant frequency (45Hz) and acceleration of
  0.08 Gs power requirements achieved with a total
  of 24 transducers!

Source http//bwrc.eecs.berkeley.edu/Research/Pic
o_Radio
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Environmental Geophone Testing
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Frequency Spectrum
Maximum intensities _at_ 15 Hz, 30 Hz, 45 Hz, 0.01
Gs Total Force
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Next Week

• Connect energy harvester to support circuitry
• Continue research of environmental applications
• Field testing with harvesting circuit
• Continued geophone testing of candidates
• Power Testing with voltage regulator
• Continue documentation