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I need to read a Heatsink temperature with 5KV isolation.

how is it possible?

are there isolated temperature sensors ? or shall I design a board for it to isolate the output signals?

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  • \$\begingroup\$ I'd design a board with digital isolation and an isolated power supply. \$\endgroup\$
    – Andy aka
    Commented Aug 10, 2020 at 9:08
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    \$\begingroup\$ It's not a Pt100, rather thermocouple, but it seems very decent built: aliexpress.com/item/… \$\endgroup\$
    – Marko Buršič
    Commented Aug 10, 2020 at 10:03
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    \$\begingroup\$ PT100 isolated: aliexpress.com/item/… \$\endgroup\$
    – Marko Buršič
    Commented Aug 10, 2020 at 10:05

2 Answers 2

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The best way to accomplish this is to design a small RTD reader, and optically isolate the digital signal back to your MCU. In the case of a HV PSU, I've done this using an NTC and analog converter, with isolated COMS back to the MCU.

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Maybe bond a thin-film RTD sensor to a piece of alumina or Macor and screw or bond that to the heatsink.

If your heat sink has HV AC on it, you may have a significant additional problem no matter how you do the isolation because of capacitive coupling.

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