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Messages - balazs

Pages: [1]
1
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 26, 2021, 09:19:29 PM »
I modify the primer and also add a grounding ring.
How far should I roll the primer from the secondary?
The coil worked pretty well, but I saw a little spark on top of the antenna. Because of this, I placed the annanta a little further away, from where the mosfets deteriorated after a while. How long do I have to place the annanta? What a problem if there is a small spark on the top of the antenna.
Can I connect a 10x 300 V oscilloscope probe to the GDT output and "VBus-" where "320v-" is?



2
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 20, 2021, 07:29:04 PM »
Thank you for your answers
I shielded the driver, I tied the shadows into the protective earth, the box was plastic. The falls have disappeared from the signal. I tried the coil and it was 1000 W. I tried for about 15 minutes. The strange thing was that the circuit breaker transformer was broken. After that, the coil was still working. Then one of the starts gave no spark and slammed the fuse. This was very strange because so far when the mosfets have burned, I have either started the coil or changed the frequency of the circuit breaker. I noticed a strangeness when measuring the signal. When it is
the spark gets into the grounded part of the secondary coil, the signal at the GDT output is sometimes distorted, which is pretty weird. Cannot be these faults because the outside of the bnc connector transmits the negative signal of the interruption and the protective earth? (positive sign of interrupt runs inside)
I do not tie the secondary to the protective soil.
I would have another question on how to measure the GDT output with 230V operation, because it may not be a good idea to change the oscilloscope to -320V.



3
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 19, 2021, 05:03:29 PM »
After further attempts, strange falls occurred in the signal. Why can this be?






4
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 18, 2021, 01:11:28 PM »
Without Toroid, it worked perfectly, worked for a long time, and had no problems. Then I made a box. The sign here wasn’t that nice, there were falls in it, I didn’t take photos, but it wasn’t big enough
to deal with it. When I first tried it without a totoid, it worked perfectly. Then after I put on the toroid and the interrupter and duty frekvenci, it burned down, the 2 mosfet. After I replaced it, the signal became more beautiful again.
 I don’t know if that could have caused the death of these mosses.




5
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 09, 2021, 07:35:16 PM »
I bought zener diodes and resistors and built the protection. The signal became more beautiful again, and the ringing almost disappeared from it. The oscilloscope has been in DC mode so far, as shown in the first image.
I also measured the signal at the output of 74hc14, this is the second picture. The third image shows the output of the GDT.




6
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 05, 2021, 01:08:17 PM »
I changed the probe leg so the ringing was over. Then I put the 74hc14 back on and tested the antenna. The sign was much prettier than it was.
Would this sign no longer ruin mosfets?


7
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 04, 2021, 09:19:27 PM »
I closed VBus + towards VBus. I provided the feedback signal with a signal generator. I took out the 74hc14 because when it was in the circuit, it didn't work. I connected the feedback signal directly to the ic pins. Probe directly to the GDT. The signal was perfect. However, when I put on the Primer and placed the 30v on it, the signal became bad again.

The oscilloscope was already in DC mode, this "~" signal is just an ornament.




8
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 04, 2021, 04:05:39 PM »
I made a new gdt because I wasn't sure if the cables were the same. I also soldered the gdt output to the mosfets foot.
I switched the oscilloscope to DC mode and measured the output of gdt. The probe is placed on one leg of the mosfet and the part of the resistor where the gdt is connected with a cable. What does it mean if there is 0 Vbus on the bridge?
I added an offset because without it only the beginning of the signal is visible. The first image is offset.





9
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 03, 2021, 09:21:04 PM »
I measured this signal on the gdt output. It is certain that the mosfets receive too much tension. But it’s weird because when I use 30v, the 230v shell doesn’t ruin the mosfet. And when it breaks, it explodes, which is more like opening the 2 mosfets together.
It would help to reduce the number of gdt revolutions from 15 to 12?

10
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 03, 2021, 12:34:59 PM »
I use a battery-powered oscilloscope so its exterior is not grounded. But when the mosfets break, the oscilloscope is not connected because my probe only measures 300V. I have a 30V lab power supply that I can test on before 230V. I could find out what causes the asymmetry: I have a probe that can be set to 1X or 10X division, but with which you can set the probe not to be distorted, it only goes 10x. So the signal is already symmetrical, true, much uglier. I tried to connect the panel to the power supply on shorter wires, which helped a bit. I don't know if he can't ring from him because the DC cable is still too long.




11
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 02, 2021, 11:20:43 PM »
I measured the primary coil in parallel, so there is 20v because I can't measure 230v with the oscilloscope.
The weird thing is that the mosfet broke because I tried several times and cut off the FI relay once. Other times, when the antenna was farther away, it worked. But the antenna was still not that close to 17-25 cm.

12
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 02, 2021, 08:58:14 PM »
I twisted the cables and soldered them, the signal got a little better, but still not good. Salynos There are currently no zener diodes or potentiometers.
I tried the scroll a bit today. It works until I pick up the breaker frequency, maximum, because then it works for a few seconds and then the two mosfets burn.


13
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: April 02, 2021, 12:58:16 PM »
I'd like to ask for some more help. True, the signal is much nicer, but it still has a little ringing. One of my questions would be how to improve the present.
The other would be that the interrupt signal can only be transmitted over an optical cable, or a coaxial cable is already good for this. Can I connect this coaxial cable so that both the negative and protective ground go on the outside?



14
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: March 21, 2021, 05:52:34 PM »
Thanks to everyone for the help!
 I rebuilt half-bridge and the problem was fixed immediately and 230 V is already working

15
Solid State Tesla Coils (SSTC) / Re: gdt high frequency ring
« on: March 19, 2021, 06:26:27 PM »
The signal is measured parallel to the primary coil. I exchanged resistances for 10, but the signal remained the same. The signal generator which interrupts the ucc chips looks like this because I'm using it from a signal generator, but I tried it with the original connection, but the signal was just as ugly. I tried to shorten the cables, but that didn't bring any improvement in the signal either. This structure is by no means definitive since the half-bridge can be converted to kaizer sstc 2.




16
Solid State Tesla Coils (SSTC) / gdt high frequency ring
« on: March 19, 2021, 01:56:29 PM »
Hey everyone!
I build kaizer sstc1. The output is present in a high frequency ring. When i test 30v  works, but when it is 230v then the Q1 mosfet is immediately destroyed. One of my questions would be: it’s written here: http://www.richieburnett.co.uk/temp/gdt/gdt2.htmlthat one damping resistor I should add, but where and how much. My other question would be, could this high-frequency ring cause the instantaneous death of the Q1 mosfet?



Thank you in advance for the answers, and sorry form my English

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