Author Topic: SSTC interruptor not working  (Read 758 times)

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
SSTC interruptor not working
« on: June 23, 2019, 10:58:48 PM »
Hello, i have built medium sized teslacoil (550mm tall, 110mm in diameter), and im using this schematic for the driver: https://www.stevehv.4hv.org/SSTC5.htm
I been running it with 30VAC instead of 230VAC so i don't burn the mosfets, and it produces about 5cm arcs.

The problem is that interruptor seems to do nothing. Even if i tie the ENBL pin of both gate drivers (UCC372x) it still produces arcs. Has anyone else encountered this problem?

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1142
  • Karma: +17/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: SSTC interruptor not working
« Reply #1 on: June 25, 2019, 11:46:44 AM »
Do you have any unused IC input pins? You should tie all these unused inputs to ground, else you risk cross-talk inside the IC from EMI.

I assume you already double-checked your traces for errors etc.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #2 on: July 03, 2019, 09:02:35 PM »
Ok, update to the problem.

I got the interruptor working(ish) by having a really short antenna, however it worked very poorly; switching between interrupted and cw.

Then i made a oscillator with frequency range of ~200khz to 400 khz and connected it to antenna input. By tuning the oscillator right, the interruptor and coil worked OK. Sound was coming through, as my interruptor goes from ~100hz to 500hz.

This was all still with 30VAC. Then i decided to use it with 230VAC. First i plugged in just the bridge circuitry, it was stable. Then the control circuitry and after a second, the fuse went off (10A). The mosfets died (didnt explode though) G, D, S all shorted together. The interruptor was running with minimal duty: ~2%.

Was it the inrush current that killed them? Should i have some kind of power conditioning?

Online Fumeaux

  • High Voltage Experimenter
  • **
  • Posts: 68
  • Karma: +7/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #3 on: July 03, 2019, 09:10:32 PM »
I don't think that it was inrushcurrent. Did you calculate how much reactance your primarycurcuit has? And therefore how much current should flow?

If it worked with 30V before, my guess is that your primary reactance is too low.

Btw: The dutycycle doesn't really matter in terms of limiting current, just the heat generation.

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #4 on: July 04, 2019, 10:33:04 PM »
Changed my primary from 4 turns to 8 turns and made the diameter larger, now the interruptor doesn't work anymore...

And the coil works otherwise strange too, it produces sparks with primary connected either polarity, or GDT primary connected either polarity.

Offline Laci

  • High Voltage Engineer
  • ****
  • Posts: 213
  • Karma: +6/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #5 on: July 05, 2019, 01:07:34 AM »
The problem is that interruptor seems to do nothing. Even if i tie the ENBL pin of both gate drivers (UCC372x) it still produces arcs. Has anyone else encountered this problem?

If both enable pins are tied to ground, there should be no gate driving, so no arcs. The interrupter should always work accurately, unless if you have noise problems.
Have you grounded the unused inputs of the 74HC14, as Mads suggested?

Please upload some pictures about the driver, inverter, coil, etc.

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #6 on: July 05, 2019, 06:52:14 AM »
The unused input pins are tied to GND. I'll post pictures of the coil and interrupter later.

The ferrite is manganese-zinc.



(Don't mind the soldering on the capacitor, it is just temporary solution  ;D.)

Offline Laci

  • High Voltage Engineer
  • ****
  • Posts: 213
  • Karma: +6/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #7 on: July 05, 2019, 09:47:02 AM »
Neat setup.  :D
I'm worried about your ferrite core. It should be a high permeability core. If you have an oscilloscope you can check the gate signals at low voltage while operating(be careful with the ground leads of the scope) or connect a function generator with your running frequency to the antenna input without voltage on the bridge.

If you have noise problems, maybe grounding the heatsink could help too.

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #8 on: July 05, 2019, 10:52:24 AM »
Neat setup.  :D
I'm worried about your ferrite core. It should be a high permeability core. If you have an oscilloscope you can check the gate signals at low voltage while operating(be careful with the ground leads of the scope) or connect a function generator with your running frequency to the antenna input without voltage on the bridge.

If you have noise problems, maybe grounding the heatsink could help too.

Thanks, i have another core that is nickel-zinc. Maybe i'll try that.

I have this whole circuit in aluminum box that is connected to RF-ground (100cm x 30cm steel mesh). I have also shielded cable from the 12V supply and interrupter/oscillator, though i'm not sure which ground i should connect the shield to.
« Last Edit: July 05, 2019, 11:39:51 AM by juuzpo »

Offline juuzpo

  • High Voltage Enthusiast
  • *
  • Posts: 6
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #9 on: July 05, 2019, 05:03:36 PM »
 Here's the secondary:

Offline SAMGO

  • High Voltage Enthusiast
  • *
  • Posts: 7
  • Karma: +0/-0
    • View Profile
Re: SSTC interruptor not working
« Reply #10 on: July 06, 2019, 06:48:51 AM »
Hi,
Maybe you can try to put the enable pin of both ic to gnd and with an oscilloscope or if you didn't have one with a multimeter watch that it's really 0 to max 1.7V  like is written on datasheet. Put the measuring tool direclty on the pin so that you are shure of the measure. You can also try to make the same thing with the tesla ON and OFF and search for difference between measurement.

High Voltage Forum

Re: SSTC interruptor not working
« Reply #10 on: July 06, 2019, 06:48:51 AM »

 


* Recent Topics and Posts

post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
Today at 02:09:23 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
Today at 09:00:52 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
T3sl4co1l
Today at 08:05:06 AM
post Re: Problems with my first DRSSTC
[Dual Resonant Solid State Tesla coils]
davekni
Today at 06:30:06 AM
post Re: so far video
[Spark gap Tesla coils]
thedoc298
Today at 04:42:52 AM
post QCW Capacitor Torture Testing
[Dual Resonant Solid State Tesla coils]
Weston
Today at 02:41:44 AM
post Re: Problems with my first DRSSTC
[Dual Resonant Solid State Tesla coils]
bozidar
October 17, 2019, 05:53:09 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
October 17, 2019, 05:09:29 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
October 17, 2019, 04:04:53 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
T3sl4co1l
October 17, 2019, 11:30:19 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
October 17, 2019, 10:59:31 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
Bert911
October 17, 2019, 10:02:12 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
October 17, 2019, 08:19:19 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
Bert911
October 17, 2019, 07:57:58 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
T3sl4co1l
October 17, 2019, 06:19:14 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
T3sl4co1l
October 17, 2019, 05:45:36 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 17, 2019, 03:22:22 AM
post Re: making a useable induction forge.
[Transformer (iron core)]
davekni
October 17, 2019, 03:08:49 AM
post Re: Mysterious Chinese HV capacitors
[Capacitor banks]
Experimentonomen
October 16, 2019, 08:41:05 PM
post Re: Mysterious Chinese HV capacitors
[Capacitor banks]
ElectroXa
October 16, 2019, 08:35:30 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
rustedone
October 16, 2019, 05:49:02 PM
post Re: Analog Panel Meter Shunt Calculation and Custom Scale Design
[Beginners]
klugesmith
October 16, 2019, 05:36:46 PM
post Re: making a useable induction forge.
[Transformer (iron core)]
T3sl4co1l
October 16, 2019, 05:07:22 PM
post making a useable induction forge.
[Transformer (iron core)]
rustedone
October 16, 2019, 04:20:15 PM
post Re: 220ac to 440dc 5a boost convertor
[Voltage Multipliers]
rustedone
October 16, 2019, 04:03:58 PM
post Analog Panel Meter Shunt Calculation and Custom Scale Design
[Beginners]
Mads Barnkob
October 16, 2019, 07:56:20 AM
post Re: Mysterious Chinese HV capacitors
[Capacitor banks]
MRMILSTAR
October 16, 2019, 05:40:55 AM
post Re: Mysterious Chinese HV capacitors
[Capacitor banks]
davekni
October 16, 2019, 03:33:52 AM
post WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
[Sell / Buy / Trade]
acobaugh
October 15, 2019, 09:36:55 PM
post Mysterious Chinese HV capacitors
[Capacitor banks]
MRMILSTAR
October 15, 2019, 09:12:09 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
October 15, 2019, 12:38:24 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 10:02:07 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Weston
October 14, 2019, 08:46:54 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 08:28:19 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 07:27:22 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 14, 2019, 07:01:34 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 04:23:56 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
klugesmith
October 14, 2019, 07:27:49 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
T3sl4co1l
October 14, 2019, 07:10:39 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 05:43:57 AM
post Re: so far video
[Spark gap Tesla coils]
davekni
October 14, 2019, 05:40:27 AM
post Re: Drsstc 4 (new direction)
[Dual Resonant Solid State Tesla coils]
davekni
October 14, 2019, 05:23:48 AM
post Re: Drsstc 4 (new direction)
[Dual Resonant Solid State Tesla coils]
oneKone
October 14, 2019, 04:37:49 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 03:47:03 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
klugesmith
October 13, 2019, 11:05:25 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 13, 2019, 09:29:25 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 13, 2019, 04:43:47 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
davekni
October 13, 2019, 07:04:20 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 13, 2019, 07:00:57 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 13, 2019, 06:36:13 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30