I am trying to make a super capacitor bank that I can charge is a couple minutes and it will output a 5v USB charge (aka a power bank). My materials: a 15v 8a power adapter, 2 Maxwell 2.7v 3000F Supercapacitors, a high power buck converter and small circuit boards to produce the 5v USB. I was wondering if it was safe to connect 15v to the buck converter, step it down to close to 5.2v and connect the buck converter directly to the capacitor. I DID do some experiments with the power adapter and it seems that it has a short circuit protection as when I short the leads, it cuts off, then a couple seconds later it comes back on which repeats again and again. What will happen if I connect the capacitors? Any ideas of what I can do with it?
Electrical – quickly charge supercapacitors with a power adapter
ac-dcbatteriescapacitorchargingcurrent
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Best Answer
You don't want to put caps in series without parallel balancing resistors because otherwise you can never be sure how the voltage between the caps is split up — it would depend on ESR and ESL variance.
For your supercaps, it's worse. You are only 0.2V away from blasting the things, and the currents are so high your balancing resistors had to be very low-ohmic to have any effect. That would be a huge waste of energy.
Do yourself a favour and get a 2.5V converter.