Ramped Half Bridge SSTC
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- Опубліковано 5 вер 2024
- Here is an overview of a coil I built after ~1.5 years and 7 different PCB designs. Next project I am building a ramped DRSSTC full bridge! Thanks for checking it out.
Want more details? Check out the project thread over at High Voltage Forum - highvoltagefor...
Full schematic here:highvoltagefor...
IGBT Half bridge using FGH75T65SHD
Secondary Fres is around 350kHz with arc load.
Secondary is only 2in tall!
Input voltage is 120v from a variac
Nice looking output, good job mate.
Thanks!
hehe
@@TeslaExplorer stop it :D
Where to connect the AC sig pin. A this is where the zero cross detector is@@deeds3611
@@QZW_LabsWhere to connect the AC sig pin. A this is where the zero cross detector is
44 AWG wire dang! Nice work, it all paid off!
Thanks man! It was tough but I got the feel for it after snapping the first few turns. Trick is not to stop once you got the drill going. That and don't cramp up squeezing the trigger for several minutes.
Nice! It's very compact.
Thanks!
BTW, I'm wondering how the staccato circuit is tuned with the variac. I have heard magneticitist say that there were phasing issues when using the variac. Did you have the same problem?
@@Livewire460 I am using a small AC signal transformer that is being powered from the output of the variac so the slight phase delay it adds is also being added to the zero crossing in the staccato circuit as well.
damn camera sync!! your room light is also going down when shooting :D ...did i saw you on reddit also? awesome coil BTW !
@@PosthumanKindergarten thanks, im glad you liked it! I did make a post on Reddit as well. Yeah the lights were dimming a bit.
@@QZW_LabsAc sig. A or circuit where should I connect it? I realized that this is the output on the board, but where to connect it to what, I looked at the circuit, but did not understand, as well as the rectifier (do you have a diode bridge and capacitors separately somewhere or not? Is 220 (120 ) going purely to the board and then rectification via D5?
ok that is amazing! well made and works wonderful
Thank you, it was a long project.
Nice Work 👍
Thank you!
amazing job!
Thank you!
this is incredible, i need to figure out what im doing wrong in my staccato H-bridge SSTC as im not getting nearly as impressive results haha
Thanks! If it's any help, I found reducing primary turns had a large impact. Of course you run the risk of blowing your bridge, 2 turns was the minimum I could get away with. From there messing with coupling (until primary to secondary arcs occurred), and finally the DC blocking caps. Scoping the bridge output to see how close I was to resonance and staying just slightly under. If I kept everything the same and changed the DC caps back from 0.37uf to 0.68, I would lose like 4-5inches in arc length. Good luck!
Sheesh that is a very clean build !! Also super long arcs
How many turns of GDT? 22 turns 1:1:1 ?
Hello,
Please see the link to the project in the description. I used a prewound GDT from Mouser. Not sure of the turns, just that it worked at the required frequency. It was 1:1 1
Nice tesla coil, can you please send gerber the file of this board?❤❤❤good tesla
Man! Your small DRSSTC looks pretty amazing & cool. I love it as it's small compact & yet it gives very big output being that small. I've done some DRSSTC in the past but I only got around 12 inches sword output length. I don't know but maybe if I get some free time, I would like to build same if it OK for you to share the complete circuit. Like that I would be able to modify what I already have & integrate your designs into mine. I'll really appreciate it. Thanks in advance friend.
Hey, thank you! I am glad you like it. I updated the video description with a link to the schematic. Here is the URL as well highvoltageforum.net/index.php?topic=2338.msg20174#msg20174
@@QZW_Labs oh, hi there 2U. Many thanks man. I'll find myself some free time to build it very soon. Thank you dear.
Can you briefly go over the difference between a ramped solid state quill and a standard tesla coil?
Hello, Loneoceans has a very detailed write up on the design (which is what I copied), it can be found here www.loneoceans.com/labs/sstc3/.
To summarize, the main difference is how power is supplied to the coil. Standard coils usually use full wave rectification with a large smoothing capacitor. When the coil is switched on all of the voltage that was stored in the smoothing cap is dumped into the primary which causes a rapid power transfer resulting in branched and bushy arcs.
With a ramped coil like mine, I use half wave rectification and no smoothing capacitor. That way the coil is fed only with the positive half cycle of the mains (sine wave). The coil is then synced with the zero crossing of the half cycle so that as the coil is switched on, the power slowly 'ramps' up (from 0V) as the voltage increases through the cycle. This allows the arc to form and then grow longer as power is applied over time.
Resonant frequency is also important, general rule of thumb is 350kHz-450kHz for straight arcs. Above and below that the arcs bend or branch.
Wow that thing is crazy! Just wondering, what is the resonant frequency of the secondary coil?
Thanks! When loaded with a full arc it is around ~350kHz. Check out the link in the description to see my whole project on HV Forum.
Is it possible to replace ne556 with ne555 2 separate pieces? Just can't find the 556 and the lower end of the secondary coil of the idea in the ground? On the heating pipe, the question about GDT is how many turns? Another question about the red capacitor that stands next to the 3.3uf UCC driver should it be polypropylene? And will this coil work normally from 220 volts? It's just that you have 120 and I have 220 V and it looks like there is an error in the circuit where the staccato interrupter is there, there is a BPS and there the connection of the comb for the resistor is not correct, it should not go to +5 volts
Great questions! Thanks for checking out the video. I highly recommend making an account at highvoltageforum.net and creating a new thread. This way, I and others can more easily answer all your questions. It is not easy answering all these questions in UA-cam comments.
Hi mate.. are you able to make the two units for me for $150 each? I want the interrupter to be variable from 50KHz to 300KHz?? Thanks. Let me know. Happy to negotiate. I prefer the secondaries to be at least 30cm tall…
Hello, send me an email at qzwlabs@gmail.com and I can follow up. Thanks!
Where is the bottom of secondary connected to ? Does it connected to power GND or RF ground ?
For such a small coil I just used the mains ground connection.
@@QZW_Labs ok , nice work 👏🏻
@@Anonymous-hd7en thanks, I appreciate it! Working on a QCWDRSSTC now.