energy harvesting in small scale applications af thomas sørensen, delta
DESCRIPTION
Oplægget blev holdt ved InfinIT-arrangementet "Temadag om trådløse sensornetværk", der blev afholdt den 17. november 2010. Læs mere om arrangementet her: http://infinit.dk/dk/hvad_kan_vi_goere_for_dig/viden/reportager/vaer_smart_-_taenk_traadloest.htmTRANSCRIPT
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Applications today has a limited lifetime
The owner of +20 years data provision technology will bein an unique market position.
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How long time is 20 years ?
Is this totally outdated and beyond use ?
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Source: Powercast
The Little ProblemSystems at sleep consume all the power
Harvest Energy for Sleep time
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+ 20 Years Applications will make sense in the following areas:
Maintenance
Long term storage
Monitoring
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Monitoring
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Maintenance
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Long Term Storage
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Typical Usage
Maintenance
Long term storage
Monitoring
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Limitations
1 mWat
10°C
100 mW at 2,5 G
20 mW 143 mW
100 mW
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Batteries vs. Super Caps
300 mAh @ 1.2 V = 360 J
10 F @ delta V 2 V = 40 J
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The Power Conditioner
Harvest tiny amount's of Energy
Build of sufficient charge
Use the Energy in bursts
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Case: Traffic counting
Approximations are as good as or better than real values (reduced noise)
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Boundary conditions
Installation
Start up
Operation
Life time for the entire system
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Times they are changing
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Best practices
Keep it simple
Use 100% time on 20% of the requirements
Sketch it
Get user reaction on duty cycled functionality
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Brunata - DELTA
Energi harvesting prototype:
The battery was removed and the circuit is now driven from the heat difference between the radiator and the room.
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Bell M412 Pitch Link
• The system was able to transmit realtime data about the stress on vital components
• No batteries was needed
• Available power exceeded need300 uW harvested during level flight250 uW needed for realtime operation
Source: MicroStrain
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Torro Espacio Madrid
• 4200 Switches which must be rearranged on demand
• Uses en-ocean motion harvestere
• Saves 42.000 batteries in 25 years
Source: En-Ocean
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Powercast Coorporation
Pittsburgh Zoo
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Structural Health Monitoring in Los Alamos
• The bridge needs to be “cleared” after earthquaktes.
• Bridge health can be monitored by sensors (strain, ultra sound, etc.)
• Experiments shows that a 0.1F 3.3V C can be charged in 200s
• Wireless TX and RX 256 bytes (RS-232) 5.2 m
LA-14314-MS Feb 2007 Los Alamos National Laboratory
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Benefits from a Early Entry
• You will gain first hands experience
• You will set the std. and be in control in your market
• The technology is there and you will be able to influence what there is produced
• You will be able to get all available components for a while, which will bring you further in front
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DELTA Energy HarvestingExpertise
We have the required knowledge about:
Mechanical Design
Thermo dynamics
Micro-Electronic
Embedded Software
And we are used to combine the expertices