Electronics > Projects, Designs, and Technical Stuff
Modding old ATX supplies for 3.65v output at high current for LiFePO4 charging
magic:
--- Quote from: tooki on June 29, 2019, 11:07:19 am ---
--- Quote from: fixy88 on June 29, 2019, 11:00:52 am ---It seems like a few people have successfully defeated OCP/UVP on the control IC http://planetimming.com/atx_mod/atx_mod.html http://burnt-traces.com/?p=159
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For the love of god don’t do this, especially not for lithium charging!
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Lol, indeed.
You need additional current regulation reacting and slowing down the PSU before OCP activates, not to disable OCP :-BROKE
But that's no longer a trivial mod. Output voltage adjustment is simple, but constant current regulation doesn't exist in those PSUs and would need to be built from ground up.
fixy88:
Thanks for all the thoughts :-) Fear not, even when I'm doing things somewhat on the cheap, I'm very aware of the safety issues around lithium cells. If I manage to get something working, it will have over volt alarms and cutoffs.
wraper:
--- Quote from: fixy88 on June 29, 2019, 10:19:08 pm ---Thanks for all the thoughts :-) Fear not, even when I'm doing things somewhat on the cheap, I'm very aware of the safety issues around lithium cells. If I manage to get something working, it will have over volt alarms and cutoffs.
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:palm: If you want to get something really working, build proper charging circuit powered from PSU. Not deciding adding 6th feet to a dog if it is still moving after adding 5th feet.
fixy88:
--- Quote from: wraper on June 30, 2019, 03:21:48 am --- :palm: If you want to get something really working, build proper charging circuit powered from PSU. Not deciding adding 6th feet to a dog if it is still moving after adding 5th feet.
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Facepalm seems a bit harsh - it is common in commercial chargers and batteries to include these safety measures.
wraper:
--- Quote from: fixy88 on June 30, 2019, 09:21:15 am ---
--- Quote from: wraper on June 30, 2019, 03:21:48 am --- :palm: If you want to get something really working, build proper charging circuit powered from PSU. Not deciding adding 6th feet to a dog if it is still moving after adding 5th feet.
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Facepalm seems a bit harsh - it is common in commercial chargers and batteries to include these safety measures.
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It's not the point. Point is that adding those things to ATX PSU is like adding 5 and 6th leg to the dog. It won't be easy, and most likely won't work properly anyway. Especially considering you didn't even know they don't have CC.
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