Energy HarvestingUSB Charger
Thibault Maury
Minyoung Kim
Repeated Charging keeps our mobile Devices Grounded
Entertainment and Communications at our finger tips is the standard
Always present wherever we go
As we depend on mobile devices we become grounded when they need to be recharged
How can we stay mobile if our communications do not?
Energy Harvesting Conversion of ambient energy into usable electrical energy Become your own personal power generation station! Environmentally friendly Energy Source Allows us to collect surrounding Energy naturally expended
through the course of the day to power our mobile electronic devices
Permits us to stay mobile! Become Independent of long stagnant charging periods
Collecting Wasted Energy Solar Panels
Use suns energy while walking Placed on shoulders for
convenience Piezoelectric strips
Pressure from footsteps into electrical energy
Create energy as you walk! Faraday Tube
Spring-loaded Magnet Energy from body motions
Sent out in USB output Universal Charging
Energy Storage
Solar Body Mass Movement
The Design Harvested Energy is
feed to circuit Electrical Energy is
manipulated to charge a battery
Harvested Energy stored in Battery until needed
Stage1 - Regulator
Regulates power from constant voltage devices Solar Panels
Uses Current Regulation to keep battery charging safe Implements 10% Rule Eliminates Cut-off circuit
Stage 2 – Micro Watt Collector
Specializes in collecting small amounts of irregular energy
Piezoelectric strips Faraday Induction Tube
System of Capacitors and Inductors Voltage builds up Current is passed
through Battery Friendly Output!
540mW (PFC) + 240mW (Induction) = 780mW per day
Stage3 – USB Charger
Rechargeable NiCad Batteries to USB DC-DC Step Up 1.3V to 5.0V
Implements high efficiency chip
Power consumption is always a concern
Entire Schematic
Movie Demonstrations
Collecting Small Currents
Charging USB
Budget
Solar Panels ~$50Piezostrips ~Samples from Advanced Ceramics IncHomeDepot $25
MagnetsSpringsTube
CircuitryDC-DC Converter ~Samples from Dallas SemiconductorAA Rechargeable ~$5
Electronic Equipment ~$50Unexpected Costs ~$25Total ~$155
Time Line: Acomplished Chapters
PlannedA d d e d / M o d i f i e d
Weeks 1 2 3 4 5 6 7 8 9 10 11 12
1.0 Research on Energy harvesting
1.1 Solar Cells
1.2 Inductance energy conversion
1.3 Piezoelectricity
1.5 Power Regulator
2.0 Develop the Designs
2.1 Solar Panels
2.2 Inductance Power
2.4 Piezoelectric
2.5 Voltage Regulator
3.0 Build Systems and Combine
3.1 Solar Panel
3.2 Inductor Generator
3.3 PCB Development
3.4 Piezoelectric
3.5 Build Regulator
3.6 Package The Circuit
4.0 Troubleshooting/Testing
4.1 Charing the AA Battery
4.2 Supplying the USB
4.3 Documentaion
Questions?
Comments.
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