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| Supercapacitor charging methods from 0 V. |
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| r0d3z1:
--- Quote from: drummerdimitri on March 03, 2018, 03:06:53 pm ---I found a 600 W power supply capable to delivering a constant 50A to the bank from 0V and starts dropping when the bank's voltage near 14V. I am now capable of charging them in under 2 minutes! Model is a Mean Well PSP-600-12. --- End quote --- thanks, this suggestion is really useful for me. Could you confirm me that the feature "Constant current limiting" allow the SMPS to act like a CC-CV charger ? My doubt is how does the PS discern between a short-circuit and a discharge capacitor ? Are there some documentations about the short-circuit protection from meanwell ? |
| digsys:
--- Quote from: r0d3z1 --- thanks, this suggestion is really useful for me. Could you confirm me that the feature "Constant current limiting" allow the SMPS to act like a CC-CV charger ? My doubt is how does the PS discern between a short-circuit and a discharge capacitor ? Are there some documentations about the short-circuit protection from meanwell ? --- End quote --- I can add support that Meanwell as an excellent manufacturer, as I used to contract to a distributor and met one of the designers. BUT, that unit is not actually a constant current P/Supply ! and you can't use it as such ! --- Quote --- 105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed --- End quote --- What it is saying is - the current goes above 105% and below 135%, it will limit the current and commence voltage reduction or foldback. Not sure what the V/I profile is "exactly" with that unit, but once you try to exceed 135% it will go into full shutdown ! If I can find my tech docs, I'll see if they have a "real" CC version. |
| drummerdimitri:
--- Quote from: r0d3z1 on July 22, 2019, 06:52:56 am --- --- Quote from: drummerdimitri on March 03, 2018, 03:06:53 pm ---I found a 600 W power supply capable to delivering a constant 50A to the bank from 0V and starts dropping when the bank's voltage near 14V. I am now capable of charging them in under 2 minutes! Model is a Mean Well PSP-600-12. --- End quote --- thanks, this suggestion is really useful for me. Could you confirm me that the feature "Constant current limiting" allow the SMPS to act like a CC-CV charger ? My doubt is how does the PS discern between a short-circuit and a discharge capacitor ? Are there some documentations about the short-circuit protection from meanwell ? --- End quote --- There is no way you could short this unit out as by nature CC power supplies will not try to generate larger currents that what they're rated for. I tried to with a very large gauge wire and when I turned it on it would pass 60A of current through that wire at whatever voltage it comes out to be (Ohms law). Hope this answers your question. |
| Psi:
One dirty hack you can do to get past the problem of triggering short circuit protection is to put a light bulb in series with the load and also add a high amp relay across the light bulb to short it out. Power the relay coil from the capacitor so that once the voltage gets high enough the relay automatically removes the bulb from being in series. |
| Kjelt:
Check the posts of tatus1969. For his tab welder he designed a pcb that converts some 12V server PSU's to a supercapacitor charger. He also sells them. |
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