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I need to integrate a Power Supply Unit with three DC outputs into a single product (could also be 3 independent PSU's).

I need to generate three DC voltages up to 300V, and monitor the current in the nA range (up to few hundreds), which means the application is very low power. I have been using these Delta Elektronika, but they are not easy to integrate into a stand alone device.

I am trying to understand whether there are any OEM vendors for these kind of devices, or perhaps there can't be any because of safety markings?

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  • \$\begingroup\$ Do you plan to sense on low or high side? \$\endgroup\$
    – winny
    Commented Jan 8, 2022 at 13:29
  • \$\begingroup\$ In the low side \$\endgroup\$
    – Aquiles Carattino
    Commented Jan 8, 2022 at 13:36
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    \$\begingroup\$ If you're only going up to a few hundreds of nA, you could roll your own, chargepump or flyback \$\endgroup\$
    – Neil_UK
    Commented Jan 8, 2022 at 13:44
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    \$\begingroup\$ You could ask Delta Elektronika if they can provide their PSUs on an OEM basis. \$\endgroup\$
    – Graham Nye
    Commented Jan 8, 2022 at 14:01
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    \$\begingroup\$ Could you edit your question to say you've already asked Delta and also add any other avenues you've already researched so we don't duplicate your work? Your Delta link takes us to a page for a 30 V PSU, not a 300 V PSU. \$\endgroup\$
    – Graham Nye
    Commented Jan 8, 2022 at 15:34

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This sounds a bit like a shopping question, however it's pretty easy to buy DC-DC converters for 300V more or less output. Just shop at your favorite distributor. They tend to be a bit pricey.

Nobody (most likely) is going to want as low a current as you want, so probably something in the 1W range would be the minimum.

To monitor the current on the low side is easy, on the high side I think I'd be tempted to measure the current with an op-amp powered near the 300V output and convert it to something more hefty such as 0-100uA for 0-300nA and then receive with a resistor to ground.

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