coupling switching power supplys

[Aussie Allan]

  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

[Dark Mantis]

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.

[Aussie Allan]

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 ......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   

  Aussie Allan

[Dark Mantis]

Yes that is fairly much as I was suggesting there with a single diode on each positive output.