8kW ZVS driven Tesla Coil

DRSSTC (Tesla coil) driven by a ZVS oscillator. Power from 240VAC 60Hz line, rectified but not filtered. Power ramps up and down 120 times per second, so not quite continuous-wave. Average power is 8kW.
Compared to typical pulsed DRSSTCs, peak power is far lower, around 24kW here. Arcs are shorter and thicker, which is good for coloring arcs with metal salts and other atypical breakout points. Arcs here are hitting grounded foil 1.25 meters above breakout. Compared to my interrupted DRSSTC with similar average power that can hit grounded poles 3m away.
Design details for this coil are now posted to the High Voltage Forum in following thread:
highvoltageforum.net/index.ph...

[@voinea12]

This can definitely power the graviflyer

[@Pestek997]

I sees many of the teslas coils but yours different, the discharge look so fast. 😄 Is just amazing :3

[@davekni]

Key difference is that this coil is CW rather than short bursts of higher power. Concentrates arc power closer to coil.

[@inventorbrothers7053]

Wow the CW sparks are beautiful ❤️ an engineering masterpiece

[@davekni]

Thank you for the compliment! I also tend to enjoy these shorter thicker arcs more than the long impulsive ones from my conventional DRSSTC.

[@Magneticitist]

Haha wow! Also, largest spinner I've ever seen.

[@Hoomanrahimi]

This is the zvs drive for drsstc I told you once and asked you t try .

[@davekni]

@@Hoomanrahimi There are downsides to this ZVS topology driving Tesla coils. I'll get more into details of that in my upcoming High Voltage Forum post. Similar performance could be achieved by a more common H-Bridge series primary drive if driven CW at same 8kW average power.

[@PIETROLS]

this is so incredible man

[@sa8die]

amazing,.nice

[@SalzmanSoftware]

Styropyro v2.0

[@dragonicdragon3460]

When Styropyro made his super strong Tesl Coil I think he put a faraday cage around it cause of the radiation

[@davekni]

Radiation concerns fall in to categories. For human health, not really a concern here. Magnetic field is same order as being close to an induction cooktop. Electric field is mostly shorted out by human body conductivity. For radio interference, this coil CW at ~70kHz, far below frequency of most communications.

[@dragonicdragon3460]

@@davekni huh interesting. Well, good to know youre not unknowingly giving yourself cancer ^^

[@davekni]

@@dragonicdragon3460 Just dawned on me what you might be thinking about: Several large TC setups include a Faraday cage, not around the coil, but rather around a person standing close to coil, close enough for arcs to hit them. Instead of hitting the person directly, arcs hit Faraday cage and pass around person to ground. BTW, when I run my larger DRSSTC, I do put grounded poles around it. Not a complete cage, but enough to reduce field past poles.

[@dragonicdragon3460]

@@davekni ahhh oke ye that makes sense lol. Dont wanna get fried

[@tripplefives1402]

@@davekni Nah, because not only will it produce emissions at 70khz, but also at the fundamentals. So anyone out there using AM modes on a radio will see significant noise.

[@T2D.SteveArcs]

Hey thats cool, by ZVS are you meaning the Mazzilli oscillator mate? Thanks Steve

[@davekni]

Yes, Mazzilli oscillator with added gate drive circuitry to make it work reliably using 1200V IGBTs and max current of ~100A.

[@T2D.SteveArcs]

@@daveknicool😎 you added gate drive ICs ?

[@davekni]

@@T2D.SteveArcs Not ICs, emitter followers. NPN/PNP emitter follower pairs, one pair for each of the two IGBTs. I'll post a schematic, scope captures, and more details to the High Voltage Forum, but that may be a couple weeks out.

[@davekni]

@@T2D.SteveArcs Not totem poles, emitter followers. Voltage swing after feedback diodes is already very fast due to high operating voltage. No need to "square" it. Need to provide higher gate drive current, especially for rising gate edges without requiring an excessively low pull-up resistor value after diodes (which would dissipate excessive power).

[@tripplefives1402]

@@davekni I always wondered if you could just drive these coils with a simple oscillator followed by a generic RF amplifier. If you know the resonant frequency do you really need a feedback/flyback style circuit?

[@johnwynne-qx6br]

Thumbs 👍

[@manreaper1238]

Which transistors u use? And how they feels themselves?

[@davekni]

Design details for this coil are now posted to the High Voltage Forum in following thread: highvoltageforum.net/index.php?topic=3057.msg21792#msg21792 Two IGBTs total, one for each side, STGYA75H120DF2, as shown in schematic of above thread. Also discussed there: For making this video I did not have cooling fan power connected. Copper heat spreader under STGYA75H120DF2 increased from 22C initially to 31C by end of testing and video.

[@lonelyelectron5283]

what igbt do u use?

[@davekni]

Design details for this coil are now posted to the High Voltage Forum in following thread: highvoltageforum.net/index.php?topic=3057.msg21792#msg21792 Two IGBTs total, one for each side, STGYA75H120DF2, as shown in schematic of above thread.