Author Topic: SSTC interruptor not working  (Read 1317 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?

Online Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1324
  • Karma: +21/-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?

Offline Fumeaux

  • High Voltage Experimenter
  • **
  • Posts: 71
  • 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: 214
  • 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: 214
  • 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: Corona lockdown thread, tell about your situation
[General Chat]
Mads Barnkob
Today at 09:27:50 PM
post Re: A few (stupidly basic) questions
[Beginners]
davekni
Today at 08:58:12 PM
post Field Mill
[Static Electricity]
haversin
Today at 08:46:26 PM
post Re: A few (stupidly basic) questions
[Beginners]
Uspring
Today at 08:41:49 PM
post Re: Fishing for atmospheric electricity
[Static Electricity]
haversin
Today at 08:25:29 PM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
johnf
Today at 08:24:07 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
Today at 08:20:25 PM
post Re: (DR)SSTC music MIDI files
[Dual Resonant Solid State Tesla coils (DRSSTC)]
DJthefirst
Today at 08:20:07 PM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
davekni
Today at 08:09:29 PM
post Re: A few (stupidly basic) questions
[Beginners]
Mads Barnkob
Today at 02:53:24 PM
post Re: A few (stupidly basic) questions
[Beginners]
John123
Today at 11:46:07 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
Today at 11:40:55 AM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
John123
Today at 11:32:19 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
Today at 03:48:55 AM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
April 01, 2020, 09:47:42 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 01, 2020, 09:31:49 PM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
davekni
April 01, 2020, 08:47:11 PM
post Re: Fishing for atmospheric electricity
[Static Electricity]
johnf
April 01, 2020, 08:45:14 PM
post Re: Homemade HV transformer
[Transformer (Ferrite Core)]
johnf
April 01, 2020, 08:37:29 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
April 01, 2020, 08:24:06 PM
post Re: Pt100 oddities
[Electronic Circuits]
davekni
April 01, 2020, 08:16:59 PM
post Re: Pt100 oddities
[Electronic Circuits]
johnf
April 01, 2020, 07:50:16 PM
post Re: Fishing for atmospheric electricity
[Static Electricity]
haversin
April 01, 2020, 07:42:47 PM
post Re: Homemade HV transformer
[Transformer (Ferrite Core)]
John123
April 01, 2020, 07:39:48 PM
post Re: Fishing for atmospheric electricity
[Static Electricity]
John123
April 01, 2020, 06:07:44 PM
post Photographing/filming high voltage arcs
[DSLR]
John123
April 01, 2020, 05:17:04 PM
post Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
John123
April 01, 2020, 02:01:30 PM
post Re: Pt100 oddities
[Electronic Circuits]
kamelryttarn
April 01, 2020, 01:38:47 PM
post Re: Pt100 oddities
[Electronic Circuits]
T3sl4co1l
April 01, 2020, 12:49:21 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 01, 2020, 10:29:06 AM
post Pt100 oddities
[Electronic Circuits]
kamelryttarn
April 01, 2020, 09:48:37 AM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
Weston
April 01, 2020, 07:01:51 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
April 01, 2020, 04:15:41 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 01, 2020, 04:05:20 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
April 01, 2020, 01:51:05 AM
post Re: A few (stupidly basic) questions
[Beginners]
davekni
April 01, 2020, 01:32:54 AM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
March 31, 2020, 11:03:36 PM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
Weston
March 31, 2020, 10:13:13 PM
post Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
March 31, 2020, 09:15:23 PM
post Re: Homemade HV transformer
[Transformer (Ferrite Core)]
AlexanderHun
March 31, 2020, 12:05:40 PM
post Re: A few (stupidly basic) questions
[Beginners]
Mads Barnkob
March 31, 2020, 08:54:35 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 31, 2020, 04:58:16 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
March 31, 2020, 04:44:05 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
March 31, 2020, 01:33:16 AM
post Fishing for atmospheric electricity
[Static Electricity]
haversin
March 31, 2020, 12:48:56 AM
post Re: Corona lockdown thread, tell about your situation
[General Chat]
Mads Barnkob
March 30, 2020, 08:08:54 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
March 30, 2020, 07:20:08 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 30, 2020, 06:46:02 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
March 30, 2020, 06:35:13 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 30, 2020, 05:00:11 PM

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 
SimplePortal 2.3.6 © 2008-2014, SimplePortal