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coupling switching power supplys

Aussie Allan

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coupling switching power supplys
« on: October 28, 2011, 09:38:28 pm »
  OK....Ive busted my noggin all after-noon on this one ..... Don't ask why (Just yet) just need an answer from an electronics wizz...

  Take 6 ... 12V switching power supply's @ 20A each (240W max per unit) ..... now combine them all  into a single parallel rail ....with an output of 12V-120A (1440W)

  Now I know that if there's a tiny voltage difference .....it will flow into the lowest PSU and "POW" .....

  Who knows about and how a dual bridge rectifier (EDIT: or is it Dual Diode)  can be added to the diagram to get me out of jail.....or if you have alternative.....lets hear it!

  Aussie Allan
« Last Edit: October 28, 2011, 10:09:16 pm by Aussie Allan »
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Dark Mantis

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Re: coupling switching power supplys
« Reply #1 on: October 29, 2011, 02:11:10 pm »
Hi Allan,

The bridge rectifier that you are asking about is usually used to make DC output out of an AC input. I have drawn you a diagram of how it works.

I would have thought that they will already have one in each PSU anyway. Besides a single diode on the output rail should be enough to stop any problem.
« Last Edit: October 29, 2011, 02:13:51 pm by Dark Mantis »
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Aussie Allan

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  • A yoyo uses all three fundermental laws of phisics
Re: coupling switching power supplys
« Reply #2 on: October 29, 2011, 03:02:21 pm »
Hi Allan,

The bridge rectifier that you are asking about is usually used to make DC output out of an AC input. I have drawn you a diagram of how it works.

I would have thought that they will already have one in each PSU anyway. Besides a single diode on the output rail should be enough to stop any problem.
Wow! Nice drawing...... ;) .....Yeah, .... already got this far but apparently , can't trust the on-board Diode on the + rail ..... having the same PSU amp-age / voltage  feeding down the Positive rail wasn't factored into most designs :D......so yes....sort of right ....but have to beef-up the safety substantially   .... I think I know what to do but always open to ideas..... please, keep the information coming in please!

  Have included how I think I'll proceed but nowhere near the drawing quality as......well maybe I need better pencils   :D

  Aussie Allan
i7-4790K @4.8GHz 24/7 water clock
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Phobya 450 balancer
W10 Pro-64
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1x500GB for clone
6x2tb- raid5-Storage
C: Evo 970 Pro 512gb
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Dark Mantis

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Re: coupling switching power supplys
« Reply #3 on: October 29, 2011, 05:16:23 pm »
Yes that is fairly much as I was suggesting there with a single diode on each positive output.
Gigabyte X58A-UD7
i7 920
Dominators 1600 x6 12GB
6970 2GB
HX850
256GB SSD, Sam 1TB, WDB320GB
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HAF 932

Gigabyte Z68X-UD5-B3
i7 3770K
Vengeance 1600 16GB
6950 2GB
HCP1200W
Revo Drive x2, 1.5TB WDB RAID0
16x DLRW
StrikeX S7
Full water cooling
3 x 27" Iiy