Two SP-150-24 in parallel?

[gcardinal]

I have around 10 units of SP-150-24 power supplies from Mean Well - all brand new.

For most 3D printers and CNC 6A is not sufficient, however > 10A would be perfect for most application.

After checking info on Mean Well website there is no support for parallel connection on this series of PSU.

So I was thinking if it would be possible to solve this with a beefier rectifier diode on each PSU, something like PX1500K ? Or is there any other solution to utilize both PSU at ones?..

[danadak]

Here is a general discussion.


http://electronics.stackexchange.com/questions/154127/connecting-two-power-supplies-with-same-voltage-rating-to-increase-current-outpu


You could design an external circuit to force sharing, but thats not plug and
play, like a supply designed for sharing.


Regards, Dana.

[gcardinal]

...

Thank you, Dana! I was hopping for a more "in-line" solution.

How about a:
Wirewound resistor 4.7 Ohm 100 W after a rectifier diode on each PSU ?

[danadak]

What you sacrifice is V regulation, but yes that will help.And of course equal power
sharing out the window because of mismatches. Although as you raise the value of
R the more it becomes a current source. But raising R is burning power which in
turn is meting the ice cap........

Regards, Dana.

[SeanB]

Not possible to split the loading between the supplies? One does half the motors and the other the rest, or one handles the motors and the other the bed heating and the electronics. You just need to common the negative connection on both to the board common for this to work.

[danadak]

I would recommend you spend some time with a sim to establish the performance
you would like to see. Here is an example, worst case stats were done of changing
R1 and R2 values. I would posit the Vth of the diodes, variation, temp effect, would
be a greater problem, that too you can sim.

Regards, Dana.