Author Topic: New to tesla coils, some questions before I start building a SSTC  (Read 92 times)

Offline Blin

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Hello all!

Newbie in tesla coils (and in electronics) here, I want to build a SSTC (not a DRSSTC - I want to keep it as simple as possible for now). I think I understand most of the circuits around here, but I have some questions before I start building.

I plan to start with a single MOSFET SSTC to keep things simple (later I'll build a half bridge, then full bridge).

I've seen this design from E-Schmok and I want to build something similar, but I want to be sure I understand the purpose of some components in this circuit.



I got the interrupter part figured out already, my questions are about the power part:
* Can the power supply which powers the primary and MOSFET be a regulated switch mode power supply?
* What's the purpose of R13 and C23? Looks like a RC snubber?
* What's the purpose of D5 and D6? I guess it's to clamp the voltage to the MOSFET gate but 15v should be harmless for an IRFP540, so I'm wondering.
* Any reason to have 2 push-pull stages (Q5-Q6 and Q7-Q8)? Would a single one be enough?
* What's the purpose of C19 and C20?

I'm also a bit lost about the secondary design. I've seen different advices, sometimes contradictory. I've put some values in JavaTC and got a diameter, height and number of turns, but I don't want to make a secondary that won't produce sparks with my single transistor design. Is there a rule of thumb for secondary designs? How much does it depend on the power circuit?

The transistor I plan to use is a fcp20n60 (600V, 60A pulsed, RDSon=0.15) so not the best one out there, but I've got quite a few and I don't care if I blow them up.

Thanks for your insight, I still have a lot to learn...

Offline FilipŠebík

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Re: New to tesla coils, some questions before I start building a SSTC
« Reply #1 on: March 10, 2019, 08:21:47 PM »
Hello, to answer the questions first:
1. Yes, they can be driven/regulated using SMPS
2. Actually it is, so you are right
3. The zener diodes are there for gate protection and they should be used
4. Yeah it should be but the gain of just the BD139 and BD140 may not be high enough and can reduce the gate drive, which may not make the mosfet open fully but partialy and thus it will work in its linear region, in which losses are big, so you should use the first stage too
6. They are just used as a filters, to filter the voltage rail

The secondary could be any coil with 1000+ turns and it should be 1:5 width:Height for small coils under 30cm, 1:4 for bigger coils Under 1m and 1:3 for big coils 1m<
The fcp20n60 is ok to use here.

Offline Mads Barnkob

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Re: New to tesla coils, some questions before I start building a SSTC
« Reply #2 on: March 11, 2019, 09:46:17 AM »
Hi Blin and welcome to HVF

Filip answered all your questions, so I just give a word on the secondary design.

For a DRSSTC it is my opponion, showed with calculations that the smaller coils, the smaller W:H ratios is possible. I like 1:4 to 1:5 for DRSSTCs, depending on the power level, simply because the most power the better it is to have some distance to earth so all strikes are not just to ground. See table 3 and 4 here: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/secondary-coil/

For a SSTC the W:H ratios should be smaller because a SSTC needs a much higher coupling to produce a fair amount of sparks. 1:2 to 1:3 for a SSTC is the optimal in my experience.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

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Re: New to tesla coils, some questions before I start building a SSTC
« Reply #2 on: March 11, 2019, 09:46:17 AM »

 


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