Ultracapacitor project

Discussion in 'The Projects Forum' started by jacradn, Jun 7, 2013.

  1. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    I have a battery of ultracapacitors 8.1V, 1000F.
    I need to design a charger for rapid charging of battery.
    To be fast charging current must be greater than 30A to max. 100A.

    Does anyone have any idea how to do?
     
  2. wayneh

    Expert

    Sep 9, 2010
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    A high capacity battery charger could do the job if you could arrange your capacitors in two halves in series, to get half the charger's voltage (~7V) across them.
     
  3. trader007

    Active Member

    Feb 27, 2010
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    since theyre capacitors, they shouldnt need a charging circuit. mcmelectronics has some 30a 12v power supplies that you can lower the voltage on.

    this would work :D http://www.mcmelectronics.com/product/72-7685

    or a cheaper way would be to get a 7.4v r/c car battery pack and wire it directly to the capacitors. they normally are about 8v charged. i think it would work with some of the better packs, be careful though.
     
  4. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    Thanks for the replies.

    I have a new question.

    need a load control with these sources?
    supercapacitor battery needs to have a load control?
     
  5. wayneh

    Expert

    Sep 9, 2010
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    They're your capacitors, you tell us. ;)

    Do you think you need to limit the charging/discharging current? Otherwise I don't know what you mean by "load control".
     
  6. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    Is need create some protection to disconnect the capacitor battery when fully charged? note: I use a current supply to charge the battery.

    Thanks.
     
  7. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
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    Might be helpful if you tell us what you're trying to build.
     
  8. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    I have a battery of supercapacitors and I will charge with a current source 100 A.

    I want know if need create some protection to disconnect the capacitor battery when fully charged?
     
  9. Shagas

    Active Member

    May 13, 2013
    802
    74
    Since it's a capacitor then you just have to charge it with a voltage lower than the rated which is 8.1 V.
    So if your supply is 7,5 V then the cap will charge up and stop at 7,5 by itself .

    I'm just waiting for someone more experienced to drop in and say how many volts an 8.1V rated supercap can be charged up to without damaging its lifetime and ESR .
     
  10. wayneh

    Expert

    Sep 9, 2010
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    I agree. The only criterion you need to know when to stop charging is the voltage on the capacitor. You don't want to exceed the rating. If it was me, I wouldn't design it to exceed, say, 80% of the rated voltage.

    I think you should also be certain of the charging and discharging rates, that they will not exceed the specifications and burn up your capacitors.
     
  11. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    the supercapacitor supports up to 130 A.
    with a voltage source I know that there would be no problem with the load.
    but this kind of load is slow, the supercapacitors support charges and discharges very fast, and typically are loaded through current sources with a constant current.

    this battery of supercapacitors have 8.1 V, 1000F, 9.12Wh and fully charge in 80 seconds with a current source 100A constant.

    But I need a protection to disconnect the battery when fully charged.

    My question is how i can make this protection?

    http://www.maxwell.com/products/ultracapacitors/docs/an-010_charging_ultracaps.pdf#search="charge"
     
  12. jacradn

    Thread Starter New Member

    Jun 7, 2013
    9
    0

    the supercapacitor supports up to 130 A.
    with a voltage source I know that there would be no problem with the load.
    but this kind of load is slow, the supercapacitors support charges and discharges very fast, and typically are loaded through current sources with a constant current.

    this battery of supercapacitors have 8.1 V, 1000F, 9.12Wh and fully charge in 80 seconds with a current source 100A constant.

    But I need a protection to disconnect the battery when fully charged.

    My question is how i can make this protection?

    http://www.maxwell.com/products/ultracapacitors/docs/an-010_charging_ultracaps.pdf#search="charge"
     
  13. wayneh

    Expert

    Sep 9, 2010
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    Why? What are you protecting? Are you saying your charger will not stop at 8.1V on its own? Use a voltage cutoff. But you need to switch a large current, so that will not be simple.
     
  14. jacradn

    Thread Starter New Member

    Jun 7, 2013
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    I found an article that has what I want to do

    http://telkomnika.ee.uad.ac.id/n9/files/Vol.7No.3Des09/7.3.12.09.01.pdf

    In Figure 5 is the schematic that I want to implement but the controller is not explained. does anyone know how is the controller of Figure 5 under the mask
     
  15. jacradn

    Thread Starter New Member

    Jun 7, 2013
    9
    0
    I found an article that has what I want to do

    http://telkomnika.ee.uad.ac.id/n9/files/Vol.7No.3Des09/7.3.12.09.01.pdf

    In Figure 5 is the schematic that I want to implement but the controller is not explained. does anyone know how is the controller of Figure 5 under the mask
     
  16. jacradn

    Thread Starter New Member

    Jun 7, 2013
    9
    0
    I found an article that has what I want to do

    http://telkomnika.ee.uad.ac.id/n9/files/Vol.7No.3Des09/7.3.12.09.01.pdf

    In Figure 5 is the schematic that I want to implement but the controller is not explained. does anyone know how is the controller of Figure 5 under the mask
     
  17. wayneh

    Expert

    Sep 9, 2010
    12,156
    3,063
    The authors might be happy to respond to you. ;)
     
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