Electronics > Projects, Designs, and Technical Stuff
What the best way to mount HIGH voltage semiconductors to grounded coolers?
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Zero999:

--- Quote from: N2IXK on November 20, 2018, 04:19:46 pm ---Beryllium Oxide "thermal links" were used on conduction cooled vacuum tubes, where the anode may be operating at thousands of volts above ground.



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And back then, electrical safety standards weren't so strict.


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--- Quote from: Le_Bassiste on November 20, 2018, 11:57:12 am ---
--- Quote from: 001 on November 19, 2018, 06:23:06 pm ---Hey Hey

Ho to do it without rocket since?

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 :-DD if i get it correctly from your opening post, the important keywords are "600V" and "grounded heatsink".
hence i  assume that your application is mains-connected and requires double or reinforced isolation, so you have to consult the applicable safety standards for your application wrt voltage categories, etc.
have a look at silicone tubing for power transistors,
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again, keep in mind that you will have to use double or reinforced isolation for your application.

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If the heatsink is grounded then reinforced/double insulation is unnecessary. Only basic insulation is required and whilst it does have to fulfil certain regulatory requirements, above functional insulation, they're nowhere near as strict as double/reinforced insulation which would only be required if the heatsink isn't earthed and the user may come into electrical contact with it.

Reinforced insulation typically needs to be double that of basic insulation. Here are some links about creepage and clearances which is relevant to heatsinking and PCBs.

https://www.infineon.com/dgdl/Infineon-ApplicationNote_MOSFET_CoolMOS_Electrical_safety_and_Isolation-AN-v01_00-EN.pdf?fileId=db3a30433d1d0bbe013d20e0cbf017fe
http://www.reo.co.uk/files/safety_7_-_low_voltage_directive.pdf
http://blog.optimumdesign.com/clearance-and-creepage-rules-for-pcb-assembly
https://www.frontdoor.biz/HowToPCB/HowToPCB-extra/CreepageandClearance.pdf
https://www.silabs.com/documents/public/application-notes/AN583.pdf


--- Quote ---https://thermal.henkel-adhesives.com/en/eimea/thermal-materials-products/product-detail/sil-pad-400.html
mounting clips (already mentioned by others in this thread) and heatsinks that are made to accomodate those clips.
https://www.digikey.de/en/product-highlight/a/aavid-thermalloy/max-clip-heat-sinks
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At a glance it doesn't appear that those solutions will be applicable for basic insulation at 600V, but it depends on the materials used. Read the data sheets in great detail.
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