Re: when can power supplies be connected in series, and when can they not?
From: Chris (cfoley1064_at_yahoo.com)
Date: 03/30/05
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Date: 29 Mar 2005 18:29:33 -0800
Michael Noone wrote:
> Hi - I remember hearing that some DC power supplies cannot be
connected in
> series, while others can. Can anybody tell me what
> features/specifications/etc. to look for in a power supply that can
be
> connected in series with other power supplies? Thanks!
>
> -Micahel Noone
Hi, Michael. In addition to Mr. Fields' note, both power supplies
should be capable of carrying the current requirement of the load. For
instance, if PS 1 is 5V @ 3A, and PS2 is 5V @ 1A, you'll get 10V if you
put them in series, but you can't draw more than 1 amp from your 10V
supply.
If you're dealing with high voltage, you also have to look at the hipot
between the transformer primary and secondary, and the hipot between
the secondary and the chassis, if that's at another potential.
If your power supplies are regulated, the combined supply will have
different (and usually somewhat worse) specifications for load
transient response. That's because the output capacitors of the
supplies are in series, too. Also take a look at load regulation.
It's best to do some experimentation if these are critical.
Good luck
Chris
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