Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1860
| Posted: 03:54am 17 Jul 2024 |
Just keep in mind that this is my experience with my inverter, I've been using this power board for over a year now. It uses a huge heatsink and it turned out to be a complete overkill, a smaller but still large heatsink from old solar inverters will easily handle this, and the heatsink temperature should hardly rise more then 6° above ambient over time.
The temperature sensors on my heatsink are mounted on the FET heat transfer bars, right next to the FETS, these bars connect the FETS to the heat sink, this should be the hottest point in the heatsink to FET thermal coupling. Measuring the body of the FETS as best as I could, indicated a 1° or 2° difference across the insulating medium at high power levels.
IMHO With a good size heatsink with correct thermal coupling it will run relatively cool.
Yes, as I mentioned, use that HS sensor for the second toriod, which is the real heat source and running power limiter, and you could always use an external sensor to monitor heatsinks until you are comfortable with your design at the power levels you want, and confirm for yourself the low heat generation in the heatsink with these power boards and the controller design.
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Edited 2024-07-17 14:03 by KeepIS