Thank you Appreciate the info!!
On Tue, Sep 18, 2018, 2:18 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:
> On 9/18/18 10:52 AM, jerry miller wrote:
> > That is interesting I've been trying to find out if you can feed a pole
> pig
> > with a 60 Hertz d/c Square wave with adjustable duty cycle or in other
> > words a pwm. Which would think that it would work for current limiting
> > or??
> >
>
> I think someone on the list fooled with using a Variable Speed Motor
> Drive (aka VFD) (which generates a pseudo sine wave at a commanded
> frequency and voltage) to feed a HV transformer.
>
> I don't know that I'd feed a square wave, when it's so easy to get a
> reasonably sinusoidal waveform these days.
>
> Or, if you're looking at doing current limiting? About 20 years ago, I
> experimented with using a FET chopper to be a "solid state variac" - in
> my case I was driving a single phase AC capacitor run motor. It kind of
> worked ok, but was kind of complex to make it work, and when decent
> single phase VFDs became cheap it wasn't worth it.
>
> But you might be to make a PWM current limiter (a pseudo ballast).
>
> If you're talking about feeding a pole pig with different frequencies, I
> think that would work - your losses would go up as the frequency goes up
> (the lamination thickness is chosen according to skin depth at the
> operating frequency... thinner laminations are more expensive), but that
> might not be a big problem in tesla coil duty.
>
>
> We do testing at work using a pair of solid state 600W Crown PA
> amplifiers driven by a lab oscillator. It can put out 120V without any
> problem. A similar sort of thing is done to drive a vibration testing
> table.
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