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  • Let's Learn About Super Capacitors! (A Practical Guide to Super Capacitors)

    Quick question. If you're fully discharging a series capacitor bank, some caps will reach 0V before the other ones in the bank. Since current still keeps flowing, the caps that still have energy in them will proceed to reverse-charge the caps that were previously at 0V. Is this very harmful to them or can they tolerate some small amount of reverse charge?I'm asking because I have a bank of 6x 500F supercaps in series in a balancing board that bleeds off any excess voltage above about 2.66V (maximum dissipation 1A). It works fine for over-voltage protection (I tested it with a DC-DC converter before soldering on the capacitors) but my testing shows that it does not block reverse current. I was wondering if I should put a reverse-biased Schottky diode in parallel with each capacitor to pr...

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    Quick question. If you're fully discharging a series capacitor bank, some caps will reach 0V before the other ones in the bank. Since current still keeps flowing, the caps that still have energy in them will proceed to reverse-charge the caps that were previously at 0V. Is this very harmful to them or can they tolerate some small amount of reverse charge?I'm asking because I have a bank of 6x 500F supercaps in series in a balancing board that bleeds off any excess voltage above about 2.66V (maximum dissipation 1A). It works fine for over-voltage protection (I tested it with a DC-DC converter before soldering on the capacitors) but my testing shows that it does not block reverse current. I was wondering if I should put a reverse-biased Schottky diode in parallel with each capacitor to protect it by behaving as a short-circuit in case the voltage across that cap ever turns negative.

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