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Subject: Re: Problems with MOSFET drivers
Date: Mon, 18 Nov 2002 17:53:16 -0000
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"Mike Poulton" wrote in message
> On 18 Nov 2002, Winfield Hill said:
> > Arghhh! Please let me suggest you measure the phase of the
> > current out of your driver with respect to the voltage. You'll
> > find that at resonance it's in phase, below resonance where the
> > load appears inductive it lags, and above where the load looks
> > capacitive it leads. Readymade for generating a servo signal,
> > or at least a meter reading to tell you which way to tune your
> > oscillator frequency.
> Yeah, that sounds simpler.
Hold on, Why not just use a PLL (software or otherwise) using a squared up
zero-crossing detector on the feedback winding? When in resonance the drive
signals will be the same frequency and zero degrees phase shift w.r.t. the
feedback signal. A 4046 might just do the job in edge detect mode, but a
microcontroller would be more flexible.
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