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would it be possible design any psu without any electrolytic capacitors?
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shakalnokturn:
Switching frequencies have gone higher since the 80's, while SMPS can be made reliable no recent consumer designs even go to the trouble of adding the few extra components to take the high dI/dt off the electrolytics that would allow even the Yaego and worse to last over 2 years.
brabus:

--- Quote from: Berni on February 27, 2020, 07:20:00 am ---(…) I have equipment from the 80s that still runs fine on its original caps. Its just a matter of using properly rated and quality made capacitors if you want your PSU to have a long life.

--- End quote ---

^This.
exe:
A non-electrolytic cap and a capacitance multiplier? Though, considering the load, it should be a beefy device. I can't even guesstimate heat dissipation without a simulator.
Psi:

--- Quote from: aqarwaen on February 26, 2020, 11:52:45 pm ---I just wonder how hard and how much it would cost design any psu without any electrolytic  capacitors?lets say psu is any 750w and don't use any electrolytic fluid capacitors.would it possible to design any psu what used and capacitors instead electrolytic fluid capacitors?

--- End quote ---

Depends,  are these ideas breaking your rules?

- Using solid polymer electrolytic caps (you said no electrolytic 'fluid' capacitors)
- Using a combination of ceramic caps and super capacitors to replace the bulk storage of the electrolytics
- Cheap china tantalums :)   (might be a bit explodey but it works, for a little while anyway...)
- China has started using rechargeable lipo cells in disposable products because they are cheaper than primary cells sometimes.
So I wonder if you could use lipos to replace the bulk storage of the electrolytic caps. Operate the cells at 3.8V continuously for long cell life.

hm.. If PCB space was not limited, i wonder where the sweet spot would be for paralleling hundreds of small ceramic caps

Kjelt:

--- Quote from: aqarwaen on February 26, 2020, 11:52:45 pm ---I just wonder how hard and how much it would cost design any psu without any electrolytic  capacitors?lets say psu is any 750w and don't use any electrolytic fluid capacitors.would it possible to design any psu what used and capacitors instead electrolytic fluid capacitors?
--- End quote ---
Since your requirements don't demand that it is a DC psu, and you say "any psu", any (non-regenerated) AC psu will fullfill your requirements  :)
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