Solar Charger
Portable energy for people on the move
Published in issue 411, March 2011
With renewable energy high on the agenda, this little project will appeal to everyone who would feel better charging their mobile or PDA from solar sources. A lithium-ion cell stores the sun’s energy in between charging sessions. Smart circuitry in the solar charger monitors the battery voltage and protects the battery from overcharging and deep discharge.
Features
Internal Lithium-Ion battery for storing solar energy
Versatile: your choice of batter and solar panel sizes
Direct charging/operation of USB devices.
Two switchable charging outlets:
- constant voltage output (5 V, max. 500mA)
- constant current (max. 150 mA)
Battery management for internal battery:
- Overload protection
- Under-voltage protection with hysteresis regulator and load dumping
Watchdog dropout protection
Compact dimensions
Complete firmware with source code downloadable from the Elektor website
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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