Author Topic: My SSTC's IGBT's blow up when toroid is added  (Read 769 times)

Offline Frantisek

  • High Voltage Enthusiast
  • *
  • Posts: 2
  • Karma: +0/-0
    • View Profile
My SSTC's IGBT's blow up when toroid is added
« on: October 26, 2024, 08:49:05 PM »
Hello, I've finally finished building my first Tesla coil. Here are some shots.
But I unfortunately have a few problems with it. When I add my big Toroid on top, my transistors blow up.

Source project is on Instructibles: https://www.instructables.com/Building-the-Ultimate-Solid-State-Tesla-Coil-MUSIC/

Impedance should be over 6Ohms, which in my case definitely is. My parameters for JavaTC are following:
units=1,
ambient=1,
s_ws=1,
s_Al=0,
p_ws=1,
p_Al=0,
p_ribbon=0,
temp=20,
g_radius=0,
w_radius=0,
ceil_height=0,
s_radius1=10,
s_radius2=10,
s_height1=0,
s_height2=25,
s_turn=750,
s_wd=0.032,
p_radius1=15,
p_radius2=15,
p_height1=1,
p_height2=12,
p_turn=5,
p_wd=0.1,
p_vwidth=0,
p_rthick=0,
Cp_uF=0,
Lead_Length=0,
Lead_Diameter=0,
desired_k=0,
t.inner=8.5,
t.outer=31,
t.height=25,
TT=true,
TG=false,
x_Vin=0,
x_Vout=0,
x_Iout=0,
x_Hz=0,
x_Vadjust=0,
x_ballast=0,
rsg_ELS=0,
rsg_ELR=0,
rsg_rpm=0,
rsg_disc_D=0,
rsg_ELR_D=0,
rsg_ELS_D=0,
stat_EL=0,
stat_EL_D=0,
stat_gap=0,
SPE=true,
RGE=false

If you have any suggestions, please let me know. :)

Happy sparks,
Frantisek
« Last Edit: November 03, 2024, 05:35:24 PM by Frantisek »

Offline Mads Barnkob

  • Administrator
  • Executive Board Member
  • *****
  • Posts: 2353
  • Karma: +78/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: My SSTC's mosfets blow up when toroid is added
« Reply #1 on: October 27, 2024, 05:32:16 PM »
I can not tell you why your switches are blowing up, but I can tell you about the differences of no-topload and topload operation, which should makes ud able to understand why the switches blow up.

No-topload
- High resonant frequency, higher switch losses
- Low "secondary load" as less charge can be stored

Topload
- Lower resonant frequency, lower switch losses
- High initial "secondary load" as its harder for the inverter to build up the potential difference. Initial start conditions with a empty topload capacitance, could be what blows the switches.

Check impedance matching between inverter and secondary system
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline Frantisek

  • High Voltage Enthusiast
  • *
  • Posts: 2
  • Karma: +0/-0
    • View Profile
Re: My SSTC's IGBT's blow up when toroid is added
« Reply #2 on: November 01, 2024, 02:37:57 PM »
Hello,
thanks for quick answer. Impedance without the top load is about 9.6 Ohms (based on JavaTC and some basic calculations). With top load, it's about 7.0 Ohms.
Based on LabCoatz design, my coil should work perfectly fine (Impedance should be a bit over 6 Ohms, resonant frequency under 400 kHz).
I'm still not sure why it doesn't work. Antena connected to the PCB is about 15 cm long, and it's end is close to the primary, so that should be fine. Also the whole PCB is grounded with aluminum foil underneath it.
Also, LabCoatz (the main creator) has resonant freq of secondary around 240 kHz, so maybe I'll be forced to cut down my secondary from 25 cm to around 18 cm (so from 750 windings to around 500) to get around these 240 kHz without any top load attached.
I'll also try adjusting my antena, changing it's length and stuff. I will update this post after testing.
PCB schematic:


Happy sparks,
Frantisek

*after some thinking, my primary coil impedance is about 6,7 Ohms with toroid attached (should be over 6 Ohms for my IGBT's). Which could be the case. Also now the primary coil has impedance around 9 Ohms without any top load. I'll try primary with at least 1 more turn (which will cause the impedance to be around 10 Ohms or higher).
« Last Edit: November 03, 2024, 06:52:20 PM by Frantisek »

Offline AstRii

  • High Voltage Engineer
  • ****
  • Posts: 279
  • Karma: +10/-0
  • Czech Technical University in Prague
    • View Profile
    • UHVlab - Tesla Coils | High Voltage | Education
Re: My SSTC's IGBT's blow up when toroid is added
« Reply #3 on: November 21, 2024, 07:17:16 PM »
Antenna feedback can be difficult to get right, have you tried using a transformer to sense secondary voltage instead?
Bc. Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

High Voltage Forum

Re: My SSTC's IGBT's blow up when toroid is added
« Reply #3 on: November 21, 2024, 07:17:16 PM »

 


* Recent Topics and Posts

post Re: My DRSSTC1 rebuild / Strange GDT ringing
[Dual Resonant Solid State Tesla coils (DRSSTC)]
LoFoTroFo
Today at 06:17:25 PM
post Re: Single board for SSTC and DRSSTC operation
[Solid State Tesla Coils (SSTC)]
davekni
December 01, 2024, 10:45:49 PM
post Re: My DRSSTC1 rebuild / Strange GDT ringing
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 01, 2024, 09:53:13 PM
post Re: My DRSSTC1 rebuild / Strange GDT ringing
[Dual Resonant Solid State Tesla coils (DRSSTC)]
LoFoTroFo
December 01, 2024, 03:42:44 PM
post Re: Last cap in CW always blowing up
[Voltage Multipliers]
JoeBusic
December 01, 2024, 03:30:50 PM
post Scientific Atlanta (Cisco) 1 GHz Combiner and PSU Teardown
[Electronic Circuits]
Mads Barnkob
December 01, 2024, 11:43:09 AM
post GU-81M Hartley Driven VTTC
[Vacuum Tube Tesla Coils (VTTC)]
janno288
December 01, 2024, 10:46:59 AM
post Single board for SSTC and DRSSTC operation
[Solid State Tesla Coils (SSTC)]
Simranjit
November 30, 2024, 09:10:38 PM
post Re: My DRSSTC1 rebuild / Strange GDT ringing
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 30, 2024, 07:29:22 PM
post My DRSSTC1 rebuild / Strange GDT ringing
[Dual Resonant Solid State Tesla coils (DRSSTC)]
LoFoTroFo
November 30, 2024, 01:47:58 PM
post Re: Many Multiple Mini Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
rikkitikkitavi
November 29, 2024, 02:10:44 PM
post Re: Many Multiple Mini Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 28, 2024, 09:34:29 PM
post Many Multiple Mini Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
rikkitikkitavi
November 28, 2024, 07:52:42 PM
post Re: Oscilloscope recommendation for SSTC?
[Solid State Tesla Coils (SSTC)]
Simranjit
November 26, 2024, 11:34:05 PM
post Re: The evolution of a solid state Tesla coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
November 25, 2024, 01:03:46 AM
post GU-81M VTTC 2.7MHz Help
[Vacuum Tube Tesla Coils (VTTC)]
janno288
November 24, 2024, 01:53:22 PM
post Re: My SSTC's IGBT's blow up when toroid is added
[Solid State Tesla Coils (SSTC)]
AstRii
November 21, 2024, 07:17:16 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
petespaco
November 20, 2024, 12:11:18 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
betalab99
November 19, 2024, 05:41:27 PM
post Re: Testing and teardown of a commercial induction heater
[Electronic Circuits]
Anders Mikkelsen
November 19, 2024, 01:33:48 PM
post Re: Testing and teardown of a commercial induction heater
[Electronic Circuits]
DashApple
November 19, 2024, 08:02:30 AM
post Re: First DRSSTC, Full Bridge PCB & IGBT Selection question.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 19, 2024, 05:31:47 AM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
futurist
November 19, 2024, 02:33:42 AM
post Re: Testing and teardown of a commercial induction heater
[Electronic Circuits]
dejuli2
November 18, 2024, 11:19:28 PM
post Re: First DRSSTC, Full Bridge PCB & IGBT Selection question.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
November 18, 2024, 08:43:20 PM
post Re: Testing and teardown of a commercial induction heater
[Electronic Circuits]
DashApple
November 18, 2024, 06:07:11 PM
post Re: Is intentional overlap in the secondary theoretically possible?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
MinuteMylar
November 18, 2024, 05:04:09 PM
post Re: First DRSSTC, Full Bridge PCB & IGBT Selection question.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Beggernator.
November 18, 2024, 12:17:41 PM
post Re: Testing and teardown of a commercial induction heater
[Electronic Circuits]
dejuli2
November 18, 2024, 09:25:38 AM
post Re: First DRSSTC, Full Bridge PCB & IGBT Selection question.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 18, 2024, 01:09:10 AM
post Re: 160mm DRSSTC project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
paulsimik
November 17, 2024, 11:36:52 PM
post Re: 160mm DRSSTC project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mathieu thm
November 17, 2024, 10:28:23 PM
post Re: 160mm DRSSTC project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
November 17, 2024, 10:13:44 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