Solar Cell powered Charge Pump
Hazmatt_(The Underdog), Thu Apr 05 2007, 04:56AMHere'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.
Re: Solar Cell powered Charge Pump
Cain, Fri May 25 2007, 06:10PM
so howd you go?
Cain, Fri May 25 2007, 06:10PM
so howd you go?
Re: Solar Cell powered Charge Pump
Hazmatt_(The Underdog), Fri May 25 2007, 06:24PM
how'd I go????
I don't understand the question.
Hazmatt_(The Underdog), Fri May 25 2007, 06:24PM
how'd I go????
I don't understand the question.
Re: Solar Cell powered Charge Pump
Vaxian, Sat May 26 2007, 09:01PM
Neat idea!
Seeing one on a larger scale might produce better results.
Too bad solar cells are still so expensive!
Vaxian, Sat May 26 2007, 09:01PM
Neat idea!
Seeing one on a larger scale might produce better results.
Too bad solar cells are still so expensive!
Re: Solar Cell powered Charge Pump
Electroholic, Sat May 26 2007, 10:12PM
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.
Electroholic, Sat May 26 2007, 10:12PM
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.
Re: Solar Cell powered Charge Pump
Hazmatt_(The Underdog), Sun May 27 2007, 01:00AM
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.
Hazmatt_(The Underdog), Sun May 27 2007, 01:00AM
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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