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Re: Terry's DRSSTC - Controller Experiment
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- Subject: Re: Terry's DRSSTC - Controller Experiment
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- Date: Wed, 20 Apr 2005 12:51:53 -0600
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Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxx>
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.
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Wednesday, April 20, 2005 7:17 PM
Subject: Re: Terry's DRSSTC - Controller Experiment
Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
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.
At 07:59 PM 4/19/2005, you wrote:
Tesla list wrote:
Original poster: Steve Ward <steve.ward@xxxxxxxxx>
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
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