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hey aking.
just wondering if you could show us what you have going. i think you had mentioned that you would
thinking about super caps, with the internal resistance and the vast amount of capacitance, could it be that some redidual charge remains even after apparent complete discharge? if you have a cap, or caps, that exibit this, wouldnt it be a good idea to have a bunch of them in parallel, or even series, and just take from that, even just a bit at a time to allow it to bounce back? have you tried dead shorting the cap, a cap exibiting the self recharge, and letting it sit for say a week or more?
and even a step further, apply a smal negative voltage, one that emulates the voltage read from the cap in the recharged condition, to possibly bring the cap to an actual zero charge state.
i know its a lot to ask. do have some large super caps on hand that are from a lamboghini avarntador that are used to energize the starter. if you ever hear one start up, seems almost instantaneous. i do repairs on these modules for a lambo dealer. the casing takes on water and causes corrosion shorting of the cap chain(6 in series). sometimes i come across a bank that is too far gone and i keep them for possible later use of the caps that were not damaged. the ones i can fix, i do a complete discharge of all the caps individually. the reason being is even some of the modules that dont have water damage, the caps tend to not balance out in the chain after many charges and discharges. the module has voltage sampling wires, red on pos end of pack and black on the neg end, and a purple wire in the middle of the chain. that wire samples the difference in charge between the first 3 caps and the other 3 caps. if that sample becomes different eventually, the car will not start on purpose, probably to keep the pack from having balance issues that could cause fire hazard and such.
so, the reason for discharging each cap becomes apparent. if i discharge the pack as a whole, it is possible that the lowest voltage cap could go reverse voltage once it goes to zero and the others still have potential. that would be an issue. so i do them individually with car stop light bulbs, 2 parallel each cell, and when the lights go out i dead short for the rest of the discharge.
then there is another issue. supper caps tend to have self discharge leakage, some of these more than others. in this case, when i charge the pack to say 13v, i can see which ones are leaking more than others. then i use the adjustable supply to push those a bit beyond max voltage and it seems to burn out those leaks and we are very near good again. the leakage portion of the repair is sometimes a try try again till good.
anyway, these caps have definitely been 'pulsed hard'. direct charge from the car battery via a high quality solenoid, then the batt disconnects and the cap starts the car alone. the pack is welded with heavy link bars
so if i get to a point that i need them, i can cut good ones from a bad pack. these are very high current, low resistance.
im gathering different value caps, 3 each, to do the orbo test. normal caps.
firstly ill try the toroid winding inductance with a diode and find the right combo that will send most all of capA to capB. will try it with and without the magnets in place, no connection to the output winding, as the magnets inserted affect the inductance of the toroid coil.
mags
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