RE: Re: Bmax calculation for driver transformmer

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>



>
>But, the frequency you should be using is NOT the
>250 kHz (unless you
>really want to drive the gate with a sine wave)...
>the real issue is the
>dV/dt, and the equation you used (popular for power
>transformers and CW
>sine applications) essentially calculates that from
>Vrms and frequency.
>If you want decent square edges, you probably need
>to figure your frequency
>at several tens of MHz, or possibly higher.
>
Right, and those higher harmonics have B contributions much lower than the
fundamental.  For Bmax, all you care about is the fundamental.  The best
you can do is use the smallest number of turns without saturating the
transformer at the fundamental.  Its as simple as that.  No calculus is
needed :) :)   Its not rocket science.  Rob.