Author Topic: Adding capacitor to primary in SSTC  (Read 602 times)

Offline Simranjit

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Adding capacitor to primary in SSTC
« on: June 06, 2024, 11:20:23 PM »
Hi, Could someone please explain what is happening here.

I completed my SSTC yesterday. I just wanted to experiment a little more with it. So, I measured inductance of primary of my tesla coil which comes out to be 11.38uH with 6 turns and after calculating required capacitance at 94kHz (resonant frequency of secondary) the the result was 250nF. I had a 270nF MKPH capacitor laying around so I added that in series with primary. The circuit was not resonating correctly with antenna and it would jump around a lot like 110kHz or 250kHz. So I just used a NE555 timer at 94kHz with 50% duty cycle and the oscillations were stable. I'm attaching some files also.

Before adding series capacitor (6 turns primary):
4.1A @ 30V
Arcs would jump from 5cms
Arcs were bushy / straight / more sparky....
Near zero transients at drain of mosfets

After adding series capacitor (6 turns primary):
0.350A @ 30V (not drawing arc)
3.5A @ 30V (when drawing arc)
Arcs only jump from small distance (maybe between 0.5cm - 1.0cm) then I can draw them further
Arcs are more fire like (so I'm guessing there is more current)
Peak-peak voltage at drain of mosfets > 55v


I'm sure this is not a DRSSTC but then what is it ? and should I proceed to make it more like this or something else:
https://www.instructables.com/Building-the-Worlds-Easiest-QCW-Tesla-Coil-Staccat/


Edit: Some other interesting observations (with series capacitor). Using antenna (resonant frequency seems to be 111kHz now) and interrupting the output with 350Hz signal at 20% duty cycle results in bushy sparks again 2.3A @ 30V jumping over 3cm. I'm attaching some images for interrupted signal.

Edit 2: Using interrupter at 60Hz with 20% duty cycle and another 555 timer at 111 kHz. The max current it draws is 0.600A @ 30V. Arcs around 2cm. With Almost no transients at drain. Mosfets are also stone cold.
« Last Edit: June 07, 2024, 02:42:47 AM by Simranjit »

Offline davekni

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Re: Adding capacitor to primary in SSTC
« Reply #1 on: June 07, 2024, 06:42:26 AM »
Quote
I'm sure this is not a DRSSTC but then what is it ?
Yes, you changed your SSTC into a DRSSTC.  That's what "dual resonant" means.  Both primary and secondary are resonant.  Search the forum and/or elsewhere to learn about upper pole and lower pole (upper and lower resonant frequencies) of dual resonant systems.
David Knierim

Offline Michelle_

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Re: Adding capacitor to primary in SSTC
« Reply #2 on: June 07, 2024, 03:59:57 PM »
Watch out because if you actually manage to get the primary and secondary to resonate together it will pull way more amps. Personally I would focus on getting just a regular SSTC to work reliably at full power before exploring more complicated and powerful designs.

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Re: Adding capacitor to primary in SSTC
« Reply #2 on: June 07, 2024, 03:59:57 PM »

 


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