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Ask an Expert Forum Power supply outputs in series?
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Power supply outputs in series?

Andrew J
Andrew J over 4 years ago

Can any power supply with floating outputs be rigged up with its outputs in series, subject to output power limits, without specific front-panel switches/settings etc?  I'd assume 'yes' and that any front panel switching is to ensure that the channel displays were correct for this setup or even to do this with internal switching to save on cabling.  Without any settings I'd further assume you'd have to do the calculation of total voltage 'in-head' as it where.  I've seen a supply with parallel/series switch so that's obvious, a supply with neither but info in the manual that parallel/series is possible (doesn't say what it would display), and a supply with a parallel switch but not series.  The latter two have a track setting to ensure that channels follow a master which I would think would be useful in a series configuration to ensure that all channels supplied the same voltage, as would a 'all on/off' switch.  I'm not picking on or thinking of any supply in particular, it's just a generic question, apropos of nothing in particular except interest.  I've never actually had a need to do this and in fact the only 'fancy' thing I've done is create a +ve/-ve rail.

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  • michaelkellett
    michaelkellett over 2 years ago in reply to cstanton +4 suggested
    No replies but 2 likes ! I think we should answer now. All possibilities exist. I've seen supplies where its not been made very clear (in documents) that two of the outputs are connected so it's…
  • cstanton
    0 cstanton over 2 years ago

    I'm surprised this had no replies. Sorry about that.

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  • michaelkellett
    0 michaelkellett over 2 years ago in reply to cstanton

    No replies but 2 likes !

    I think we should answer now.

    All possibilities exist.

    I've seen supplies where its not been made very clear (in documents)  that two of the outputs are connected so it's really offering a single spilt supply. I have a Rigol like this.

    Usually two definitely floating supplies can be connected in series but it's worth checking because maximum voltages allowed to earth or other common point can be quite low.

    Don't connect supplies in parallel unless they say you can.

    Some really nice multi output supplies do all the switching and maths internally so that they read correctly.

    Others require you to do the maths in your head.

    Almost every case I can think of when I've connected supplies in series is when I want  a split supply so tracking is good to have. I have several that will do this. The only supply that I frequently use in // mode for extra current is a TTi MX180TP which does all the switching internally and reads out correctly.

    MK

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  • Andrew J
    0 Andrew J over 2 years ago in reply to michaelkellett

    Thanks.  I can’t even remember why I asked in the first place now except as I say: just general interest.  Three+ years ago I knew a lot less than I know now.

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  • Andrew J
    0 Andrew J over 2 years ago in reply to cstanton

    On the plus side, if this post was pre-Verint, I got a notification of the two recent responses.

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