Re: Terry's DRSSTC - Controller Experiment

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>

Colin: At F res current circulates within the coil and distrbuted
capacitance to require no external current making the secondary act as an
open circuit after absorbing initial input. When the circuit is de-tuned
power is absorbed all the time so the circuit dose not act as an open
circuit. At F res Xl and Xc are the same but 180o out of phase so all
required current is circulated. When not tuned properly external current is
required so more power must be added and the circuit looks like a roll of
low resistance copper wire.
  Robert   H
--


> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: Wed, 20 Apr 2005 12:51:53 -0600
> To: tesla@xxxxxxxxxx
> Subject: Re: Terry's DRSSTC - Controller Experiment
> Resent-From: tesla@xxxxxxxxxx
> Resent-Date: Wed, 20 Apr 2005 12:52:55 -0600 (MDT)
>
> Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxx>
>
> hi terry,
> im confused why the current would go high at either side of
> Fres as the sum of the reactancr drops to zero at resonance right? either
> that or you are talking about something different with Fo like oscillator
> frequency? just asking to clear up some of the many clouds in my mind.
> cheers
> colin
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Wednesday, April 20, 2005 7:17 PM
> Subject: Re: Terry's DRSSTC - Controller Experiment
>
>
>> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>>
>> Hi,
>>
>> Antonio is right, as the coil is de-tuned, the top voltage tends to stay
>> rather constant but the primary current tends to rise dramatically!!  I
>> think Steve reported he could run with a very highly detuned coil but I
>> suspect he was driving far higher current through is big IGBTs.
>>
>> I am tuning my DRSSTC by finding the point of least current draw.  On both
>> sides of Fo the current goes way up.  It seems at the best tuning the
>> current draw is the lowest.
>>
>> I am not concerned about which mode it is in since the drivers do not care
>> and I really don't care either ;-)
>>
>> I think I can run my old Magnifier with the DRSSTC driver too.  I may have
>> to make a new top holder since I think I "borrowed" that from the
>> magnifier.  With the DRSSTC now, the magnifier should be far easier to 
study.
>>
>> Cheers,
>>
>> Terry
>>
>>
>>
>> At 07:59 PM 4/19/2005, you wrote:
>>> Tesla list wrote:
>>>> Original poster: Steve Ward <steve.ward@xxxxxxxxx>
>>>> Terry,
>>>> I suggest you retune your primary to get rid of that primary notch.
>>>> Tuning it lower will make the primary ring up continuously, and will
>>>> give longer sparks, though you wont see them till you have many cycles
>>>> running.
>>>> I cant imagine how that minor phase shift on the very first cycle
>>>> would matter.  I think what matters more is that your primary current
>>>> is notching about a cycle later for the longer sparks.  Have you tried
>>>> tuning the primary lower?  This seems to lengthen the time between
>>>> notches in the primary current (until you get to 0 notches).
>>>
>>> The notches mean that the system is tuned in a way that at some
>>> point transfers all the stored energy to the secondary system.
>>> This results in operation, before breakout, as in a conventional
>>> capacitor-discharge Tesla coil. Without notches, the driver frequency
>>> is close to one of the resonances of the system. The output
>>> voltage may get higher, but the input current invariably gets
>>> disproportionally higher, and some of the energy never leaves
>>> the primary circuit. A system operting in this way can always
>>> be redesigned to produce the same output voltage, and energy,
>>> faster and with less input current, with notches in the primary
>>> current and voltage. After breakout, if the driver is kept running,
>>> the notches disappear.
>>>
>>> Antonio Carlos M. de Queiroz
>>
>>
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