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2018-06-21, 05:51:57
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Author Topic: Any advice on galvanic isolation for USB?  (Read 2969 times)

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I have a need for complete USB isolation up to 5kV surges. USB power will be provided by a separate (already isolated) good quality power supply.

There are plenty of products for sale but I build my own. Has anyone succeeded with this task and willing to share ideas?

Thanks,

WW


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"As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality." - Einstein

"What we observe is not nature itself, but nature exposed to our method of questioning." - Werner Heisenberg
   

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Thanks.

I'm using that device now since early last year. I'm on my fourth chip  :'(

It certainly eliminates ground loops but tends to fail after several high voltage hits below the published ratings.

Do you have USB isolation for your test equipment?


---------------------------
"As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality." - Einstein

"What we observe is not nature itself, but nature exposed to our method of questioning." - Werner Heisenberg
   

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Hi WW
I have never used USB isolation GULP i have been OK so far, but i guess most of what i have done is low voltage, low power.

I guess you could say that chip must be doing it's job, if the equipment down stream is OK afterwards.
   

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I guess you could say that chip must be doing it's job, if the equipment down stream is OK afterwards.

That's the problem  :-[

It took out an old laptop and two USB hubs. I have TVS's between lines and between lines and ground at key points. I was just after preventing ground loops as these can really screw up results.

Maybe I'll use WiFi isolation  ;)


---------------------------
"As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality." - Einstein

"What we observe is not nature itself, but nature exposed to our method of questioning." - Werner Heisenberg
   

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Posts: 1855
It appears WiFi will work.  ZigBee on a PIC with a USB host port is fine for lower data rates.(I'm collecting data on a circuit wrought with transients using the ADCs in the PIC).

Nothing special about the CUTs. Just a load of problems with ground loops affecting the test outcome. 


---------------------------
"As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality." - Einstein

"What we observe is not nature itself, but nature exposed to our method of questioning." - Werner Heisenberg
   
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