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What's an "isolation diode"?

Swend

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Hi friends.

I came across a interesting power point presentation https://uspas.fnal.gov/materials/11SBU/PPE_AdvancedTopologies.pdf

As it's usual with ppp's they don't give detailed info, so I'm wondering how that isolation diode (on the right connected to the -300V) is working and what it's isolating against and how it is connected to the circuit?

Screenshot from 2019-07-23 10-55-41.png
 

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usually means to prevent back feed - the whole ckt looks dicey to me - not well thought out ...
 

Swend

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usually means to prevent back feed
I thought it might be some sort of isolation to prevent parasitic capacitance since it stood there all alone.

the whole ckt looks dicey to me - not well thought out ...
Nevertheless they got the money and built it see pictures page 16-17, and they are also using something called "Equipotential Ring" - what's that?
 

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Swend

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Re: What's an "isolation diode"?

equipotential ring is exactly what it says, an actual ring, or ring of devices at the same potential ( to ground often, or to neg or some other fixed ref point )
That's exactly how I would have answered that question if someone posed that to me ;-) Besides the obvious which is shown in the pictures of the thing, allow me to rephrase my question; how does a equipotential ring work? It must be there for a purpose, and what is that?

Thanks for the link, I can see the iso diodes now in Fig. 1. Have you noticed the resemblance with BradTheRads suggestion here https://www.edaboard.com/showthread...ctually-work&p=1656904&viewfull=1#post1656904 almost same thing but with less diodes.
 

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