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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Here's my project for the last month. It's a solar powered capacitor charge pump system that I'm playing with in hopes of getting more current on the load side then what the cell can supply alone.
The cell is speced at 10V 100mA, but it really only yields about 9V and a little better then 100mA in full sunshine. The charge pump uses a 3300uF pump capacitor and a 2.2F cap as the resivouir capacitor.
It doesn't output much current now, but with a 1500R load it still charges the 2.2F cap, which was somewhat surprising. Right now I have to add the comparator to sense the voltage of the resivouir so that it can charge pump on its own efficiently, and then I get to see how much I can load it.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
We use something like that on solarcars. they are call MPPTs, buckboost converter with active tracking, its possible to get every last bit of efficiency out of the cells.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Right, well the goal is to use a supercapacitor soo large that you no longer need any batteries as a storage medium. I couldn't get there because of my charge pump design simplifications, I needed to use some IC's I found AFTER I was finished with the report, so I never had a chance to get it really going. I might go back and do more work with it.
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Solar Cell powered Charge Pump
