Nope I've not tested it to that extreme. But I can if one can guide me.
You would need a normal large electrolytic capacitor of e.g. 22000uF/16V, like http://www.mouser.com/ProductDetail/Cornell-Dubilier/229TTA016M and a storage oscilloscope to show you a few milliseconds when you connect the power supply you proposed (rating 12V/100A). Connect the oscilloscope to the capacitor and set it to trigger just above 0V and then connect the power-supply to the capacitor (matching polarity of PSU and cap). Do you use thick wiring between PSU and cap.
The picture on the oscilloscope should look similar to this, when your power supply would operate, as desired, for ultra-capacitor usage:
another question: does anyone know how the matching connectors for these are called, and where they can be ordered? I don't want to solder directly to the PSU.
another question: does anyone know how the matching connectors for these are called, and where they can be ordered? I don't want to solder directly to the PSU.That will be extremely difficult, perhaps you can measure the pitch between the individual traces (you can see the sliding of the connectors) and buy a standard card edge connector of the right width and remove the pins that are not used or might become a short hazzard.
Looks like my first message got truncated to half. The Sony cell can give 35A continuous and 100A max. for 6s. A 2s10p pack would give 1000A 7.2V max. I also wrote the cell type Sony US18650VTC5A.
I bought some Sony 18650 cells for my RC car. The specs got me thinking if they would be good for this application. Max. 100A per cell for <6s. 35A max. continuous. The model is Sony US18650VTCA. In a 2s10p setup it would give max. 1000A 7.4V.
Looks like my first message got truncated to half. The Sony cell can give 35A continuous and 100A max. for 6s. A 2s10p pack would give 1000A 7.2V max. I also wrote the cell type Sony US18650VTC5A.I only have incomplete data on these, can you share the information that you have? I didn't know that they should be good for 100A pulse. My experience though is that most Liion cells are optimized for energy density, whereas Lipos are optimized for power density:
US18650VTC5A: 2.9kW/kg (35A cont, 3.7V, 45g)
Turnigy nanotech 3S/5Ah/130C: 8.1kW/kg (325A cont, 11.1V, 442g)
Afaik, Lipos can currently only be beaten by supercapacitors.
Found them, they are using these: https://www.digikey.de/products/de/connectors-interconnects/card-edge-connectors-edgeboard-connectors/303?k=&pkeyword=&pv69=367&FV=ffe0012f%2C160003f%2C1640001%2C1680002%2C17a8000d%2C1f140000&mnonly=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25
these ones are even better: https://www.digikey.de/product-detail/de/te-connectivity-amp-connectors/1761426-1/A107664-ND/4021545 [EDIT: these have four positions too many...]
Found them, they are using these: https://www.digikey.de/products/de/connectors-interconnects/card-edge-connectors-edgeboard-connectors/303?k=&pkeyword=&pv69=367&FV=ffe0012f%2C160003f%2C1640001%2C1680002%2C17a8000d%2C1f140000&mnonly=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25
these ones are even better: https://www.digikey.de/product-detail/de/te-connectivity-amp-connectors/1761426-1/A107664-ND/4021545 [EDIT: these have four positions too many...]
Be aware that the TE Standard Edge II card edge connectors have a contact rating of 3A
I would take a look at TE "Crown edge" or "SEC-II".
But they do have remote voltage sensing, and this can eventually be turned into a constant current supply in combination with a beefy measurement shunt and an opamp circuit.
But they do have remote voltage sensing, and this can eventually be turned into a constant current supply in combination with a beefy measurement shunt and an opamp circuit.just found this thread https://endless-sphere.com/forums/viewtopic.php?f=14&t=47415 :-)
I've started testing the kWeld - with sparks going everywhere.
At 50J I burned straight through the nickel strips. At 14.6J I get strong welds but still sparks going everywhere, even though I press down on the electrodes rather hard. Peak current was just over 1400A.
14.6J
6,74ms
1.03 mOhm
1428A
With the calibration it set an offset of 66 and a resistance of 1.95 mOhm.
Does that mean you need five supercaps or is the voltage then too high?
I am doing the crimp on the cables at the moment, first time I used the hydraulic Amp tool from 1983 i inherited from a friend.
But I find the AWG8 cables a bit thin and 1m too short for my electrode holder that needs to move up and down. So just thinking what about car starter / booster cables. They are available in 500A (25mm2), 700A (35mm2) even 1000A (50mm2) and have fully isolated crocodile clamps that can easily be attached to the supercaps and/or powersupply.
But I find the AWG8 cables a bit thin and 1m too short for my electrode holder that needs to move up and down. So just thinking what about car starter / booster cables. They are available in 500A (25mm2), 700A (35mm2) even 1000A (50mm2) and have fully isolated crocodile clamps that can easily be attached to the supercaps and/or powersupply.Have you found time to read the operation manual? I am discussing this topic there. You need to find a tradeoff between cable length and ohmic resistance. There are two limits that may not be exceeded: maximum current, and maximum inductive kickback energy.
The system basically short-circuits a capable power supply, and all that's in the way is the loop resistance. I don't remember how are you going to supply the system?