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Single rail psu 2 rows of caps
Single rail psu 2 rows of caps
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Old 17th March 2020, 10:22 PM   #1
jimk04 is online now jimk04  United Kingdom
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Default Single rail psu 2 rows of caps

Probably too late to ask seeing as I've spent some time today building this!

I have soldered up the cap bank for a 51Vdc supply for a tpa3255. Used 14 of 2200uF caps and for packaging purposes I have 2 rows of caps.

These are all aligned ground inwards, so the two inner copper wires are ground. One outer wire will be in from the bridge rectifier and the other outer will be the smoothed supply.

Have I made a potential ground loop with the physical looping of the wire around the caps.?
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Old 17th March 2020, 10:40 PM   #2
rayma is offline rayma  United States
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Yes, if you connect both ends of that wire. Better to have the outside wires separate,
and the two inner wires connected together (at the output).

You can cut that loop and reverse the two rows. Then you can join the inner rows and
attach an output lead to the join. This will be electrically the same as before.

Last edited by rayma; 17th March 2020 at 10:48 PM.
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Old 17th March 2020, 10:42 PM   #3
jimk04 is online now jimk04  United Kingdom
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Ah....so just leave one end of the ground wire unterminated ?
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Old 17th March 2020, 10:44 PM   #4
ubergeeknz is offline ubergeeknz  New Zealand
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Put rectifier at one end, load at the other. Provided the rectifier/transformer secondary is not otherwise grounded you will be fine.
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Old 17th March 2020, 10:53 PM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by jimk04 View Post
Ah....so just leave one end of the ground wire unterminated ?
That would "work" but post #2 would be better. Alternatively, just use two electrically separate rows
(cut off the U at the far end), making the parallel connections at the rectifier block.

Last edited by rayma; 17th March 2020 at 11:01 PM.
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Old 17th March 2020, 11:27 PM   #6
rayma is offline rayma  United States
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Something like this, where the rectifier and load do not share a path to the caps.
The circuit ground should be taken from the junction of the (-) of the two cap rows.
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Last edited by rayma; 17th March 2020 at 11:40 PM.
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Old 18th March 2020, 04:29 AM   #7
AllenB is offline AllenB  Australia
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Single rail psu 2 rows of caps
Without cutting, you could do that. Just tie in at the 'fold'.
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Old 18th March 2020, 07:14 AM   #8
jimk04 is online now jimk04  United Kingdom
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Thanks for all the replies guys.

Stay healthy
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Old 18th March 2020, 01:45 PM   #9
jimk04 is online now jimk04  United Kingdom
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Default Better?!

I thought it all made perfect sense until I came to actually do it so I'm not sure I'm 100% there yet.

So assuming the pictures has the rectifier in from the left....load out to the right.

Positive rail 'loop' is removed from the output end.
Ground is still looped at right end and output connection tapped off the loop.
Maybe do I cut the loop at the input end?

Rectifier end positive feeds both Positve 'tracks'.

Am I heading in the right direction?

Thanks

I still have
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Old 18th March 2020, 05:16 PM   #10
Vovk Z is offline Vovk Z  Ukraine
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I think it (first pic) was ok - just use one pair as input and other pair as output.
"One outer wire will be in from the bridge rectifier and the other outer will be the smoothed supply." thats definitely fine, as it should be. Don't connect inner grounds together.

Last edited by Vovk Z; 18th March 2020 at 05:21 PM.
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