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I have two DLM 60-10 Sorenson bench power suppllies (10A limit) that I am wanting to stack in parallel so that I can provide between 1 and 20 A, at a consistent 12 V. I'm not particularly an electrically-savvy person so I am wondering the best way to go about this. It seems to me that the each power supply won't know that the other unit exists -- so since they will always be operating at the same power settings, is it as simple as splicing the outputs...? I'm guessing not. I'd appreciate some help in trying not to electrocute myself.

EDIT: Turns out that the particular DLM 60-10 power supplies we have do not have a master/slave mode built in

Austin

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    \$\begingroup\$ I'd ask Sorensen. You probably can parallel them but power supplies need to be designed with parallel operation in mind. For a bench power supply such as this I would be surprised if it's not OK but ask otherwise you risk overloading one leading to failure. \$\endgroup\$ – Warren Hill Aug 11 '17 at 18:02
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    \$\begingroup\$ We have DLM power supplies here and have run them this way. The drawback is that one supply gets all of the load until it reaches its current limit. If you are doing this in a permanent installation, there is a master/slave mode in the manual that requires use of the remote sense line which splits the load evenly, but is a little more of an effort. \$\endgroup\$ – John Birckhead Aug 11 '17 at 18:34
  • \$\begingroup\$ UPDATE: Looks like this particular unit(s) (DLM 60-10) does not have a master/slave mode. Any other ideas? @JohnBirckhead \$\endgroup\$ – Austin Prater Aug 11 '17 at 18:45
  • \$\begingroup\$ So you're saying that section 2-12 of the manual (Parallel Operation) doesn't apply to your source? That's extremely odd if true. In theory all you need is that source-to-source cable and you're done. Otherwise you can try connecting the remote current monitor from the master to the remote current control of the slave. Do your sources have the analog control headers? \$\endgroup\$ – Adam Lawrence Aug 11 '17 at 20:05
  • \$\begingroup\$ That is correct @AdamLawrence. When you purchase the DLM supplies, they all come with the same skeleton regardless of which unit you buy. Our units have the SETUP-2_slave switch, but it's not hooked up to anything internally. Trying to figure out why the schematic below, by John Birckhead wouldn't work. \$\endgroup\$ – Austin Prater Aug 11 '17 at 21:30
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schematic

simulate this circuit – Schematic created using CircuitLab

You need a couple of 10-amp diodes as shown. If you use Schottky diodes, you will only lose a half volt or so.

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    \$\begingroup\$ Incorrect. The supplies won't share current and depending on the load slope and CC turnover point all sorts of strange effects might occur. \$\endgroup\$ – Jack Creasey Aug 11 '17 at 18:05
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    \$\begingroup\$ They also won't be 12 V anymore. \$\endgroup\$ – Transistor Aug 11 '17 at 20:16
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    \$\begingroup\$ Why not? I'm not sure why this wouldn't work. Can someone explain? I am trying to take the 12 V/ 10 A from each power supply and merge it into 12 V / 20 A. \$\endgroup\$ – Austin Prater Aug 11 '17 at 21:29
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    \$\begingroup\$ Beside a master/slave option, ORing the output via two diodes is a possibility. Best is to use two diodes sharing a common die so they operate at the same temperature and may have close \$V_f\$. As such, a MBR20100 could be an option. \$\endgroup\$ – Verbal Kint Aug 12 '17 at 7:53

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