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Re: DC supply


Date: Wed, 2 Apr 1997 02:31:04 -0700
From: Open Minded <bturner-at-nospam.apc-dot-net.pupman-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: DC suppl;y

Tesla List wrote:
> 
> Subject:
>           DC supply
>       Date:
>            Mon, 31 Mar 1997 09:25:30 -0500
>       From:
>            chuck seguin <seguinc-at-algonquinc.on.ca>
>         To:
>            Tesla List <tesla-at-pupman-dot-com>
> References:
>            1
> 
> Tesla List wrote:
> >
> > Subject:
> >         Re: DC supply
> >   Date:
> >         Sun, 30 Mar 1997 03:10:21 -0700
> >   From:
> >         "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
> >     To:
> >         "Tesla List" <tesla-at-pupman-dot-com>
> >
> > To: Chuck Seguin
> >
> > The DC laser power supply does not have sufficient current to adequately
> > drive even a small size Tesla oscillator.  A neon sign transformer such
> > as
> > a 12 KV 60 ma unit would do a much better job.
> >
> > A synchronous rotary spark gap is essential a high speed switch that is
> > synchronized to the 60 HZ AC line that is charging the Tesla oscillator
> > capacitors.  As an example a salient pole synchronous 1800 RPM motor
> > used
> > with 4 rotatating electrodes would allow you to fire at the peak of the
> > AC
> > waveform.  Actually best point is usually 10-15 degrees beyond peak. The
> > rotor is loosened and rotor is manually adjusted on the motor drive
> > shaft
> > -- system is run again and an O-scope checks to see if you are firing on
> > the peak -- if not, again more adjustment of the rotor on the drive
> > shaft
> > until your RSG electrodes are in alignment with the poles of the drive
> > motor.
> >
> > While synchro types of RSG's (rotary spark gap) do produce much higher
> > peak
> > current in the secondary discharge they do not usually produce longer
> > sparks than a non-synchro RSG.  The non-synchro gap cap effectively
> > fires
> > more times per half cycle which in turn pumps the tremendous ionic field
> > above the secondary HV terminal and the sparks actually "grow" outward
> > to
> > produce longer discharges.  We must also assume your power supply is
> > capable of re-charging the HV capacitors quickly (faster than 30
> > milliseconds).  This is usually the case in all but the most strained
> > power
> > supply configurations.
> >
> >  Running a Tesla coil on DC is possible but the quenching problems
> > become
> > more serious.  DC does not quench as well as AC because the waveform is
> > not
> > reversing -- this reversing helps the quenching action somewhat.
> >
> > Hopes this helps out -- have fun with your power supply.
> >
> > DR.RESONANCE-at-next-wave-dot-net
> >
> > ----------
> > > From: Tesla List <tesla-at-pupman-dot-com>
> > > To: tesla-at-poodle.pupman-dot-com
> > > Subject: DC supply
> > > Date: Thursday,March 27,1997 9:49 PM
> > >
> > > Subject:
> > >         DC supply
> > >   Date:
> > >         Thu, 27 Mar 1997 09:58:10 -0500
> > >   From:
> > >         chuck seguin <seguinc-at-algonquinc.on.ca>
> > >     To:
> > >         Tesla List <tesla-at-pupman-dot-com>
> > >
> > >
> > > Good morning everyone,
> > >
> > > Here is a question that puzzles me.
> > >
> > > I have aquired a great XFMR from friends at a local college.  It was
> > > used, at the time, for a TEA laser power supply.  It's a 30 kV -at- ? mA.
> > > The interesting portion of this is the fact its a DC supply.  It's got a
> > > full wave bridge connected accross the output.  The whole thing is
> > > submerged in XFMR oil.  Now the question: can I use a DC supply
> > > appropriatly to operate a large system, or small one at that?
> > >
> > > Please comment with a detailed explanation.
> > >
> > > Another question.
> > > Why is a synchronous, rotary, gap called that way?
> > > My studies indicate that the best time to fire the gap is at the peak of
> > > the AC waveform, to transfer the max energy.  How is this accomplished
> > > when you have a rotating gap that is started (the motor that is) at we
> > > don't know when, on the AC waveform?  Or do we have something that does
> > > "synchronize" the firing of the gap with the peak of the AC waveform.
> > >
> > > The two questions do relate, for me.  If I use a DC power supply (full
> > > wave rectification actually) how will a fire the gap appropriatly
> > >
> > > Thanks in advance.
> > >
> > > ChuckThanks for the info.
> 
> Here is another question.  With this laser power supply came a custom
> made spark gap.  It consists of a
> special spark plug that forms a pre-ionizarion gap and one of the
> electrodes of the SG.  The other electrode
> is on the opposite side and the whole thing is assembled with thick
> plexi.  My tests show that 30 kv will not
> break down the gap because of it's distance.  If low pressure air is
> allowed to flow into this pre-ionozation
> gap and the pre-I gap is fired the main gap will also fire.  Sounds like
> a great scheme if I can generate and
> synchronize a pre-I spark.  What do you think?
> 
> Chuck


Chuck -

What you have there is a triggered spark gap. This would work
great for initiating a Marx ladder avalance or an exploding-wire
setup. Hmmmm. Put a variable-rate HV ignition coil circuit on
the trigger....?????

- Brent

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