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Should generally be about 8khz for most power igbts today at the low end. Newer ones are faster and therefore generate less heat as a rule of thumb.
Comments: sure your measuring method works?
I could see 4 khz because you are using 1/2 the base frequency, And you should have some divisor process in the control chip.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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