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Old 3rd November 2015, 06:40 AM   #1
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Default Capacitor bank for ps supply filter

Found this capacitor bank pcb on eBay, has four 2200 uf 450v caps. Is this feasible for power supply filter?
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Old 3rd November 2015, 07:02 AM   #2
AndrewT is offline AndrewT  Scotland
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Yes.

Check how it is wired up.
It could be a CCCC supply
or
CRCRCRC, the resistors improve the ripple attenuation.

It is fairly easy to add in R between the Cs to gain that extra filtering effect.

BUT !!!
beware, 2200uF @ 450V is enormous energy storage.
Will your rectifier blow up trying to charge this cap bank?
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Old 3rd November 2015, 07:04 AM   #3
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It's slightly confusing to me how the caps are wired, but here's better view of board
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Old 3rd November 2015, 07:10 AM   #4
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Using 4 Fairchild r18120g2 18amp 1200v diodes
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Old 3rd November 2015, 07:30 AM   #5
AndrewT is offline AndrewT  Scotland
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Can you read the capacitor label?
Are they 2200uF 450V ?

Without seeing a sch, I'm getting the impression that it has two sets of series connected caps.
Note the left pair are connected + to - and similarly the right pair are connected + to -
That makes me wonder if the four resistors are voltage balancing, indicating that the caps are not 450V but something lower.
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Last edited by AndrewT; 3rd November 2015 at 07:35 AM.
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Old 3rd November 2015, 07:34 AM   #6
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Here's pic
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Old 3rd November 2015, 07:35 AM   #7
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There are 2 600v glass fuses on the board, and 4 wima mkp 10 capacitors at what looks like the outputs
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Old 3rd November 2015, 07:41 AM   #8
AndrewT is offline AndrewT  Scotland
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clearly 4off 2m2F @ 450V
They are old stock. Reform them, slowly to the full 450Vdc.
You can use a variac to slowly (over a perod of some hours) wind up the voltage and current limit each capacitor, using ~100k to 1M0 resistors.

You would need to remove at least three from the PCB to do this.
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Old 3rd November 2015, 07:43 AM   #9
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I can do that tomorrow, do them one at a time. Would it be wise to use the pcb board like it is afterwards?
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Old 3rd November 2015, 08:01 AM   #10
AndrewT is offline AndrewT  Scotland
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you can use four limiting resistors to feed the four separate capacitors.

That way you can reform all four in the same 24hours.
Yes, it takes that long for the oxide layer to reform to minimise leakage current.
Once you have that very fine oxide insulating layer in there it degrades very slowly, if you don't maintain that reforming voltage on the plates.

But the big part is the the leakage current drops very low as soon as the working voltage falls below the reform voltage.
I don't remember the numbers, it's of the order of half leakage current for 80% of the voltage. Datasheets usually spell this out.
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