[sdiy] Using switching power supplies in series to get bipolar outputs?

Mattias Rickardsson mr at analogue.org
Mon Nov 20 15:21:39 CET 2023


Wasn't there something with the sinking/sourcing of current that introduced
some potential (no pun intended) problem when using two positive supplies
as a bipolar supply?

Can't seem to remember the details or where I heard it right now.

/mr



Den mån 20 nov. 2023 13:43Roman Sowa <modular at go2.pl> skrev:

> But hooking them up in series to get higher voltage actually IS making a
> bipolar supply. It only depends which node you decide is the 0V. The
> outputs are isolated from AC inpt so you can do whatever you want with
> multiple outputs up to the isolation limit which is if I'm not mistaken
> up to 3kV
>
> Roman
>
> W dniu 2023-11-18 o 15:08, Scott Bernardi via Synth-diy pisze:
> > I've noticed that most switching power supplies that offer bipolar
> > outputs(i.e., to get +/-12v) have less current capability on the
> > negative supply than the positive.  For example, the Meanwell 65B which
> > has +/-12v and +5v, great for Eurorack, has
> > +5v max 8 amps
> > +12v max 3.5 amps
> > -12v max 1 amp
> > What about buying two +12v supplies, or maybe one that has +12v and +5v
> > with another with just +12v, and hooking them in series with a center
> > tap to get +/- 12v?
> >
> > This article
> >
> https://www.mouser.com/pdfDocs/blog_how-to-operate-parallel-and-series-connection.pdf
> <
> https://www.mouser.com/pdfDocs/blog_how-to-operate-parallel-and-series-connection.pdf> looks
> like it's possible, although they only talk about hooking them up in series
> to increase the output voltage rather than bipolar.
> > Has anybody done this?
> >
> >
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