Various aspects of home brew inverters

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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 07:40am 12 Apr 2021      

Safe operating area is a thermal limit of conduction loss only.

Ten milliseconds on, and then a cool down period significantly longer than 10mS.
Its switching on and off at 20Khz+ so there will be switching losses on top of conduction losses, and you cannot be sure that the current shares equally between the three mosfets.

But I think you might be getting pretty close to the limit, but difficult to know where the cliff edge of absolute ultimate doom precisely is.