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

Oren Leavitt obl64 at ix.netcom.com
Sat Nov 18 18:34:27 CET 2023


That will work as long as the + and - outputs are floating, isolated 
from ground. The center tap can be grounded in your system.

On 11/18/23 8:08 AM, Scott Bernardi via Synth-diy wrote:
> 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 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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