Monday, 30 December 2019

Series identical power supplies


Recently I made a thread about parallel supplies, however my helper fried one of them... Wonderful.


So I got myself 4 of the famous DPS-1200FB-1 12v 100A power supplies. So I am an electronics noob, hence my name. I know the issue with parallel supplies is current sharing, but I don’t see anything wrong with putting all 4 12v power supplies in series to get 48v at 100A.


I am still not clear with what galvanic isolation is. I believe it is making power supplies so the ground wires aren’t touching each other or something like that.


So could I put these 4 PSUs in series to get 48v at 100A? Do I need to float them? What if I don’t float them?


I cannot find a datasheet for these, but I bought them from here



Answer



Galvanically isolated means there is no DC coupling between the input and output.


Here is the best step by step on how to remove the ground strap on all except the 1st supply. Then add a bus resistor to enable the supply.



https://www.rchelination.com/index.php/tech-tips/how-to-setting-up-the-hp-dps-1200fb-power-supply


Y caps are line to ground used for line noise EMI filters.


PE is the Protective Earth ground.


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