Author Topic: SSTC interruptor not working  (Read 1643 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: 1402
  • Karma: +23/-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: 74
  • 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: compact midi interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
Today at 10:36:18 AM
post Re: Current Sense transformer trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 12:48:13 AM
post compact midi interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TmaxElectronics
Today at 12:17:38 AM
post Re: Current Sense transformer trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TmaxElectronics
June 06, 2020, 11:48:59 PM
post Re: Reverse engineering a big old American smoke detector
[Radioactive Sources]
TheMaxii2007
June 06, 2020, 10:44:15 PM
post Re: Vacuum capacitor circuit advice
[Electronic Circuits]
davekni
June 06, 2020, 08:19:44 PM
post Re: Current Sense transformer trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 06, 2020, 08:11:13 PM
post Re: Current Sense transformer trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
klugesmith
June 06, 2020, 07:59:11 PM
post Re: SSTC DRIVER WITH NON FUNCTIONAL ENABLE PIN FOLLOWUP
[Solid State Tesla Coils (SSTC)]
davekni
June 06, 2020, 07:32:49 PM
post Re: Any good suggestions for our QCW "sword sparks" mechanism research?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
June 06, 2020, 07:11:56 PM
post Re: Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
June 06, 2020, 06:46:57 PM
post Current Sense transformer trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TmaxElectronics
June 06, 2020, 05:46:56 PM
post Re: Linear Guide and Ball Screw
[General Chat]
HiVi
June 06, 2020, 11:53:55 AM
post Vacuum capacitor circuit advice
[Electronic Circuits]
Martin hughes
June 06, 2020, 11:03:13 AM
post Re: Improving IGBT gate drive
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Nijin
June 06, 2020, 10:20:31 AM
post SSTC DRIVER WITH NON FUNCTIONAL ENABLE PIN FOLLOWUP
[Solid State Tesla Coils (SSTC)]
prabhatkumar
June 06, 2020, 10:10:59 AM
post Re: Linear Guide and Ball Screw
[General Chat]
klugesmith
June 06, 2020, 01:01:27 AM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
k42
June 05, 2020, 06:18:16 PM
post Re: Ericsson Tower Mounted Amplifer Teardown and measurement
[Radio Frequency]
Da_Stier
June 05, 2020, 06:08:18 PM
post Re: Any good suggestions for our QCW "sword arc" mechanism research?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
k42
June 05, 2020, 06:00:25 PM
post Nokia Siemens Flexi 3x70W FXEA 1800MHz Base Station Teardown
[Radio Frequency]
Mads Barnkob
June 05, 2020, 11:17:05 AM
post Re: Linear Guide and Ball Screw
[General Chat]
HiVi
June 05, 2020, 10:02:02 AM
post Re: Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Weston
June 05, 2020, 12:54:06 AM
post Linear Guide and Ball Screw
[General Chat]
Patrick
June 04, 2020, 08:14:58 AM
post Re: Reverse engineering a big old American smoke detector
[Radioactive Sources]
klugesmith
June 04, 2020, 06:30:09 AM
post Re: Datasheet Question
[Electronic Circuits]
Mads Barnkob
June 03, 2020, 08:01:53 PM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
June 03, 2020, 03:04:11 PM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
June 03, 2020, 02:54:04 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Max
June 03, 2020, 02:27:26 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Hydron
June 03, 2020, 02:19:32 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Mads Barnkob
June 03, 2020, 02:10:57 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
arctichominid
June 03, 2020, 02:10:18 PM
post Re: New projet OmegaDR
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mugi30
June 03, 2020, 12:27:06 PM
post Datasheet Question
[Electronic Circuits]
ritaismyconscience
June 03, 2020, 08:10:27 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
June 03, 2020, 07:57:48 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 03, 2020, 07:01:44 AM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
John123
June 03, 2020, 01:01:25 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
ritaismyconscience
June 03, 2020, 12:50:28 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
June 03, 2020, 12:35:11 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
09d08
June 03, 2020, 12:22:31 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
johnf
June 02, 2020, 09:25:51 PM
post Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
09d08
June 02, 2020, 03:58:49 PM
post Re: 180kV ( 20cm ) Cockroft-Walton - ZVS Driver - RF Remote Control
[Voltage Multipliers]
davekni
June 02, 2020, 06:50:52 AM
post 180kV ( 20cm ) Cockroft-Walton - ZVS Driver - RF Remote Control
[Voltage Multipliers]
TheMaxii2007
June 02, 2020, 05:52:14 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
davekni
June 02, 2020, 04:53:24 AM
post Re: Reverse engineering a big old American smoke detector
[Radioactive Sources]
TheMaxii2007
June 02, 2020, 04:19:02 AM
post Re: Neon transformer
[Transformer (Iron Core)]
MRMILSTAR
June 01, 2020, 11:55:28 PM
post Re: Neon transformer
[Transformer (Iron Core)]
Mads Barnkob
June 01, 2020, 08:34:10 PM
post Re: Neon transformer
[Transformer (Iron Core)]
ritaismyconscience
June 01, 2020, 07:58:20 PM
post smallest iron core high voltage transformer ?
[Transformer (Iron Core)]
ElectroXa
June 01, 2020, 05:50:47 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