Author Topic: Huge Mistake Designing My Coil  (Read 214 times)

Offline MarcusFunt

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Huge Mistake Designing My Coil
« on: August 11, 2022, 10:03:54 AM »
Hi

I am building a relatively large SGTC and made a stupid mistake while calculating the resonant frequency.
I stupidly forgot to add the topload to javatc, and calculated the whole thing as if the top load didn't exist.
Is there a way to raise the secondary's resonant frequency enough to add a small top load?
I could of course just add some more primary turns, but I spend a lot of time making a good-looking primary and would like it to stay as it is now.
I'm feeding the coil 2.1 kw

Is it possible matching the primary and secondary frequency without adding more than a few primary turns or changing my(too small I know) capacitor?
Do I even need the top load in the first place?
All help would be much appreciated! :D

Offline MRMILSTAR

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Re: Huge Mistake Designing My Coil
« Reply #1 on: August 11, 2022, 05:07:28 PM »
As far as I know you will need to change the number of turns on either the primary coil or the secondary coil to change the resonant frequency. Changing the primary circuit capacitance is also an option but that is usually impractical. Another factor that you may consider modeling in JAVATC is maximum streamer length. A streamer adds capacitance and thus changes the resonant frequency. JAVATC gives you the ability to model several top loads simultaneously thus you can model the streamer as a very tall and thin cylindrical top load on top of the main top load.

You definitely will need a top load for several reasons. The main reason is to add capacitance to the secondary circuit. Another important reason is to do EM field-shaping. Proper field-shaping is essential to prevent sparks and corona from emanating from the top turns of the secondary coil.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline MarcusFunt

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Re: Huge Mistake Designing My Coil
« Reply #2 on: August 11, 2022, 06:54:14 PM »
As far as I know you will need to change the number of turns on either the primary coil or the secondary coil to change the resonant frequency. Changing the primary circuit capacitance is also an option but that is usually impractical. Another factor that you may consider modeling in JAVATC is maximum streamer length. A streamer adds capacitance and thus changes the resonant frequency. JAVATC gives you the ability to model several top loads simultaneously thus you can model the streamer as a very tall and thin cylindrical top load on top of the main top load.

You definitely will need a top load for several reasons. The main reason is to add capacitance to the secondary circuit. Another important reason is to do EM field-shaping. Proper field-shaping is essential to prevent sparks and corona from emanating from the top turns of the secondary coil.

Thank you for the javatc tip.
Is it possible running the secondary at a nodal frequency.(secondary at 225khz and primary at 450khz?)

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Re: Huge Mistake Designing My Coil
« Reply #2 on: August 11, 2022, 06:54:14 PM »

 


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