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Old 07-05-2018, 05:14 PM   #1 (permalink)
Ale Madeo
 
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pwm frecuency

Hi,
I understand that the pwm frecuency must be 10KHz, but on my board I have about 3KHz.
Any idea what´s wrong?
I have an 8MHz crystal.

thanks

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Old 07-05-2018, 07:55 PM   #2 (permalink)
Somewhat crazed
 
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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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