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    ATX PSU and 24V

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    • justus2342undefined
      justus2342
      last edited by

      I am kind of fed-up with those industrial 24v power-supplies in my printers. They are ugly, noisy, single-voltage and not switchable by the duet board.

      So it came to my mind, that one might just take a ATX PSU with two independent 12V-rails and just daisy-chain them. For example a be quiet! straight power 11 750W. (Yes it has 4x 12V-rails, but it should be possible to take 2 and 2 of those rails in parallel each and then daisy chain these pairs)

      Should this work as I think it does?

      As far as I could find out, this setup is not really common. Is there any good reason for this being not popular?

      Tevo Little Monster (Duet2, Smart Effector, lin Rails, Magb. Arms)
      Anycubic Delta Linear Plus (Duet2, Smart Effector, Magb. Arms)
      Two Trees Sapphire Pro (MKS Robin, Marlin 2.x, D. Extruder)

      A Former User? zaptaundefined 2 Replies Last reply Reply Quote 0
      • Vetiundefined
        Veti
        last edited by Veti

        @justus2342 said in ATX PSU and 24V:

        They are ugly, noisy, single-voltage and not switchable by the duet board.

        there is one with on off support
        https://www.meanwell.com/webapp/product/search.aspx?prod=RSP-500

        and one which is fanless
        https://www.meanwell.com/webapp/product/search.aspx?prod=UHP-350(R)

        i used to use a cheap atx power supply. i just build an adapter for the cpu power plug
        and connected the other using wago quick connects.

        i switched because 24v give you better stepper driver performance

        A Former User? 1 Reply Last reply Reply Quote 0
        • A Former User?
          A Former User @justus2342
          last edited by

          @justus2342 said in ATX PSU and 24V:

          just take a ATX PSU with two independent 12V-rails

          unlikely to be a success as most if, not all, ATX PSU use a common ground; so when wiring this is series you are effectively shorting 12v to ground.

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          • arhiundefined
            arhi
            last edited by

            As previously written, there are regular 24V psu bricks with 5Vsb and on/off .. most manufacturers make them. Also as @bearer said, those ATX psu boxes use common ground so pushing rails in series is not going to be easy task and using -12V rail to get to 24V is problematic too as -12V rail rarely have capability to push more than 200-500mA.

            OTOH you can, fairly easy, make your PSU output 24V. Usually cheaper the PSU easier the mod. The general el-cheapo (and many expensive ones) have a single transformer inside and a pwm regulator (usually TL431) that's monitoring 5V rail. There's a voltage divider on the 5V rail feeding the sense pin. Change this voltage divider and you get different output. Pay attention that all voltages are related so if you change this regulated 5V with divider to be 10V your 12V rail will become 24V, your 3v3 rail will become 6.6 etc etc ... so ALL rails will change as PSU monitor only 5V and other one are related to it by winding relation in the transformer.

            Check the 5Vsb voltage, that is often separately generated and is not affected by this but in any case make sure if you are connecting it to power duet or rpi or.. that it's an appropriate voltage.

            Depending on how cheap the PSU is, often they cheap out on the output capacitors so you will have 15 or 16V caps on the 12V rail... you need to check all the caps and replace them with one with proper voltage rating for your new voltage.

            Still IMHO cheaper and faster to get a proper PSU with "remote control" input for on/off

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            • Vetiundefined
              Veti
              last edited by

              there is a psu power off modules
              https://de.aliexpress.com/item/4000210923653.html

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              • A Former User?
                A Former User @Veti
                last edited by

                @Veti said in ATX PSU and 24V:

                and one which is fanless
                https://www.meanwell.com/webapp/product/search.aspx?prod=UHP-350(R)

                don't think that one has remote on/off btw

                but when turning the power off when the duet is idle i doubt a psu fan is a problem as the hotend will likely make as much noise anyway (and if i'm not mistaken the fan is controlled on the 24v version of those Meanwell RSP series)

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                • Vetiundefined
                  Veti
                  last edited by Veti

                  @bearer said in ATX PSU and 24V:

                  don't think that one has remote on/off btw

                  no but combine it with the psu power off module and then it does.

                  the uhp series is fanless. i use it myself. just mount it onto metal for heat transfer

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                  • zaptaundefined
                    zapta @justus2342
                    last edited by

                    @justus2342, are you sure that those 12V outputs are isolated and don't share ground?

                    Theoretically connecting two 12V in series gives 24V but there may be corner cases. For example, if one of the two detects over current and shuts off, will it see a reverse voltage on its output from the other power supply? Will it get damaged?

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                    • Dad003undefined
                      Dad003
                      last edited by Dad003

                      in my 3d printer build , i have a 850 watt modular pc PSU that run the board for extruder and stepper motor , i have a 600 watt 24 volt for the heated bed connected via a mosfet controlled by the board,

                      that 24volt psu is very noisy , it make more noise than the printer running

                      zaptaundefined 1 Reply Last reply Reply Quote 0
                      • zaptaundefined
                        zapta @Dad003
                        last edited by

                        @Dad003 said in ATX PSU and 24V:

                        that 24volt psu is very noisy , it make more noise than the printer running

                        I also had a noisy power supply (the high speed fan was turn on every minute or two and was very noisy) so I switch to a mean-welll UHP 500W (they came with a wide range of power) which are compact very efficient and thus don't need a fan and stay cool.

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                        • Thaliosundefined
                          Thalios
                          last edited by

                          From my RC days, i've been using HP server power supplies to feed 24V to my Powerlab 8 charger. Each pushes 900W for a total of 1800W at 24V. (12V each in series for 24V).

                          Works like a charm and is super stable, and was about 80$USD total if I remember right.

                          Railcore II 300ZL with lots of upgrades (Duet 3 6HC)
                          Heavily modified Ender 3 Pro (Duet 3 6HC)
                          Heavily modified Tronxy X5SA-500 Pro with Chimera+ and dual bondtech (Duet 3 6HC)
                          CR-10S Pro V2 (Duet 3 Mini 5+)
                          and a bunch of SLA printers..

                          Phaedruxundefined 1 Reply Last reply Reply Quote 0
                          • Phaedruxundefined
                            Phaedrux Moderator @Thalios
                            last edited by

                            @Thalios said in ATX PSU and 24V:

                            HP server power supplies

                            Do they come with noise canceling headphones?

                            Z-Bot CoreXY Build | Thingiverse Profile

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                            • Thaliosundefined
                              Thalios
                              last edited by

                              haha I wish.

                              They are a tad noisy!

                              Railcore II 300ZL with lots of upgrades (Duet 3 6HC)
                              Heavily modified Ender 3 Pro (Duet 3 6HC)
                              Heavily modified Tronxy X5SA-500 Pro with Chimera+ and dual bondtech (Duet 3 6HC)
                              CR-10S Pro V2 (Duet 3 Mini 5+)
                              and a bunch of SLA printers..

                              1 Reply Last reply Reply Quote 0
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