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Re: 3rd harmonic trap
- To: tesla@xxxxxxxxxx
- Subject: Re: 3rd harmonic trap
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Wed, 23 Mar 2005 16:42:19 -0700
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Original poster: Jimmy Hynes <jphynes@xxxxxxxxx>
Using a series LC as a band pass filter wouldn't work so well either.
Like before, it won't resonate at the harmonics natural frequency, but
it will resonate at a new frequency with the filter. It's like having
two sets of series LCs. they wont resonate at their own frequency, but
there is a frequency that it'll resonate at. Just find the equivalent
since their just in series, you can treat the two Ls and the two Cs as
a single inductor and a single capacitor.
Are you actually having problems with the driver locking onto the
wrong frequency, or is it just to be safe? I think the only way to
keep other frequencies out is to filter in the smarts so that it won't
drive at any other frequency.
On Wed, 23 Mar 2005 08:38:20 -0700, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Jolyon Cox" <jolyon@xxxxxxxxxxxxxxxxxxxxxxxx>
> if a 3rd harmonic band-reject filter or "trap" would not work, how about a
> band-pass filter tuned to the fundamental of the TC? Would this not a
> correct description of the of circuit described in the following?
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Tuesday, March 22, 2005 1:47 AM
> Subject: Re: 3rd harmonic trap
> > Original poster: Jimmy Hynes <jphynes@xxxxxxxxx>
> > Sorry, but it won't work. Although it will block that frequency pretty
> > well, the pole is just moved a little bit.
> > It would be desireable to supress the higher modes to keep your driver
> > on the fundamental mode. I tried it once to keep my SSTC from jumping
> > to other modes during ground arcing (base current feedback is more
> > susceptible to it), and realized why it wouldn't work after some more
> > fets blew up :P
> > On Mon, 21 Mar 2005 11:35:56 -0700, Tesla list <tesla@xxxxxxxxxx> wrote:
> > > Original poster: "Jolyon Cox" <jolyon@xxxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Dear List
> > > I am wondering whether it would be possible to use a parallel-resonant
> > > circuit in series with the primary of an SSTC as a "trap" to suppress
> > > unwanted 3rd harmonic mode of oscillation.
> > > Does anyone know if this is feasible or even desireable?
> > >
> > > Jolyon
> > >
> > >