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EelectricEnergy Harvesting
Through Piezoelectric Polymers
Initial Prototype Presentation
Don Jenket, II
Kathy Li
Peter Stone
April 13, 2004 Eelectric Initial Prototype
Presentation OverviewDesign SchematicsMaterials & Processing JustificationCircuitryTailWire/Electrodes
Initial Prototype UnveilingImprovements for Final DesignRevised Timeline
April 13, 2004 Eelectric Initial Prototype
Design Schematic
Fan
Rectifier
Electronics Housing
April 13, 2004 Eelectric Initial Prototype
Circuitry Schematic
AC
LED
Capacitors
Diodes
April 13, 2004 Eelectric Initial Prototype
Materials & Processing Justifications
Circuitry – Germanium diodesRequire less voltage to bias (0.2V)
Fewest diodes used as possibleFewer voltage dropsLess power consumed by the circuit
Storage DeviceCapacitors used to store energy
April 13, 2004 Eelectric Initial Prototype
“Eel Tail” Schematic
Top View
Side View Front View
Cu Wire
12 cm
2 cm
12 cm 2 cm
0.04 mm
Cu Wire
Silver paste
Titanium Electrodes
Titanium Electrode
Head EndTail End
April 13, 2004 Eelectric Initial Prototype
Materials & Processing Justifications
Tail, Material – PVDF
April 13, 2004 Eelectric Initial Prototype
Materials & Processing Justifications
Tail, Aspect Ratio – 2 cm x 12 cm
April 13, 2004 Eelectric Initial Prototype
Materials & Processing Justifications
Electrodes – Titanium & Silver Paste Gold desired in place of Titanium
Easier processing Better properties in air
Wires – 5 mil insulated magnet wire Flexible Coiled, Wound, Twisted – noise reduction Can come in contact with other conductors (i.e. flagpole)
April 13, 2004 Eelectric Initial Prototype
Oscilloscope Data
2cm x 12cm Piezoelectric PVDF in Wind
April 13, 2004 Eelectric Initial Prototype
Circuitry Schematic
AC
LED
Capacitors
Diodes
April 13, 2004 Eelectric Initial Prototype
Current Progress
Working piezoelectric AC SourceAC Voltage ~700 mV peak-to-peak
Working rectifying circuitTakes >2000 mV AC peak-to-peak to light
an LED
What needs to be done? Increase Voltage Output from PVDF Tail
Connecting multiple tails in series Integrate the two working components
April 13, 2004 Eelectric Initial Prototype
Improvements on Final Design
LayeringTwo layers
Increases possible outputDecreases flexibilityDifficult to adhere together
Adhesive reinforcementSilver Paste alone cannot hold layers together
or wires downKapton and Mylar Tape
2-5 mil thickness should not drastically alter flexibility
April 13, 2004 Eelectric Initial Prototype
Improvements on Final Design
Electrode & Wiring Modifications12 cm
2 cm Cu Wire
Silver Electrode
PVDF
Gold Electrode
Allows for bending freedomStrain relief of wire
Run wire straight to flagpole
April 13, 2004 Eelectric Initial Prototype
Revised Timeline
2/10 2/17 2/24 3/2 3/9 3/16 3/23 4/6 4/13 4/20 4/27 5/4 5/11Electroded piezoelectronic sampleObtain PVDFInvestigate electrode technologyAttach electrodes to PVDFPreliminary measurementsBuild PrototypeElectronic CircuitryTest PrototypeAir testingOutput measurementOptimizing PrototypeIncorporating future revisionsBuild prototype IITest protoype IIPrepare DemoFinal Presentation