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How to test IEC61000 ESD for DC-DC power supply
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TimNJ:
Hi all,

Does anyone have experience testing ESD according to IEC61000 (or any standard) for a DC-DC supply that is fed from another regulated switchmode power supply.

When I've tested AC-DC converters, it's pretty simple because the AC source is the wall outlet (usually with isolation transformer in between). However, for DC-DC, we are using a rack-mount AC-DC converter to create the input voltage to the DC-DC supply. In this case, it looks like we are causing the source supply to glitch out during ESD pulses. We don't want the DC source to be affected by ESD pulses. Was thinking about using some sort of LC filter in between the source and the DUT, but I can't find much information about an actual, industry accepted test setup. Anyone have any experience?

Thank you!
Tim
T3sl4co1l:
So the source you're testing with, isn't ESD compatible?  Yikes!  (Not class A compliant, at least.)

Probably put the source behind an ISN, maybe with some TVS (between lines, and to ground if applicable) if that's not enough.

ISN is also recommended for doing induced noise, like EFT (61000-4-4).

Tim
TimNJ:
Thanks Tim. I need to double check, but seems like the source we are using is not 100% tolerant to ESD pulses. It seems to drop out for a short period of time after the ESD event. It could also be our DUT, but initial troubleshooting seemed like the source was dropping out.

It's a GWInstek rackmount source, which I'd think would be relatively robust. We'll see.

So, maybe we'll use the same LISN/decoupling network that our EFT/surge generator has and see if that works, if that's what you're saying.

Maybe that will do the trick.

Thanks!

trobbins:
What's the source DCV and current requirement?

What's the application and nominal method of power source input?
coppice:

--- Quote from: T3sl4co1l on December 09, 2019, 09:53:14 pm ---So the source you're testing with, isn't ESD compatible?  Yikes!  (Not class A compliant, at least.)

--- End quote ---
There is plenty of compliant test equipment which still give you trouble during EMI, ESD and related testing. Not just power supplies, but things like scopes going crazy during testing. Compliance means they passed a test schedule, not yours.

--- Quote from: T3sl4co1l on December 09, 2019, 09:53:14 pm ---Probably put the source behind an ISN, maybe with some TVS (between lines, and to ground if applicable) if that's not enough.

ISN is also recommended for doing induced noise, like EFT (61000-4-4).

--- End quote ---
The snag with an ISN is that any impedance between the source and the unit under test can affect the performance of the unit under test, say when its impulse response is being tested, and it needs to pull rapid bursts of energy from the source. The LISN that is part of AC/DC supply testing isn't really a problem in this regard, as an AC source isn't capable of supplying rapid bursts of energy at arbitrary times, so the LISN can't mess things up.
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