Author Topic: MOSFET Protection in SSTC  (Read 398 times)

Offline Gisho

  • High Voltage Enthusiast
  • *
  • Posts: 9
  • Karma: +1/-0
    • View Profile
MOSFET Protection in SSTC
« on: May 12, 2021, 09:36:35 AM »
I came across this slayer exciter circuit that looks quite simple and so I decided to make this a high-quality build ;)
But I also want to run this for a long period of time which means that the circuit needs to be re-designed 
My main concerns are to,
1.Protect the mosfet
2.Run the circuit for a (very) long time
3.Possibly increase performance  ;D

I'm using an IRF530 fet and 2 x19V laptop chargers(LPS) in parallel.
Secondary coil is ~1000 turns of 0.1mm wire on a 3.1cm diameter pipe.
I'm desperate to give the best protection for the mosfet
« Last Edit: May 14, 2021, 11:14:04 AM by Gisho »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1783
  • Karma: +46/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: MOSFET Protection in SSTC
« Reply #1 on: May 14, 2021, 09:48:27 AM »
This thread is on the verge of breaking rule #2: https://highvoltageforum.net/index.php?topic=31.0

1. MOSFET protection resonant/inductive circuits is well-documented in many places, use google.
2. Heat dissipation and management is well-documented in many places, use google.
3. Higher voltage / more turns on secondary.

I am looking forward to see your replies with suggested improvements you want to try, then we can talk about those. Afterall you did write "...which means that I need to re-design the circuit."
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 Gisho

  • High Voltage Enthusiast
  • *
  • Posts: 9
  • Karma: +1/-0
    • View Profile
Re: MOSFET Protection in SSTC
« Reply #2 on: May 16, 2021, 07:34:48 AM »
I added an extra diode(1n4004)  between source-drain to reduce load on the internal diode. I also added a gate-source resistor and soldered the circuit together with a fairly big heatsink attached (I initially breadboarded it  :D:P) to reduce the stray inductance , but the fet is still finger-burning hot after a 2 min run.

Offline Power-Max

  • High Voltage Enthusiast
  • *
  • Posts: 15
  • Karma: +1/-0
    • View Profile
Re: MOSFET Protection in SSTC
« Reply #3 on: June 03, 2021, 04:52:20 AM »
I added an extra diode(1n4004)  between source-drain to reduce load on the internal diode. I also added a gate-source resistor and soldered the circuit together with a fairly big heatsink attached (I initially breadboarded it  :D:P) to reduce the stray inductance , but the fet is still finger-burning hot after a 2 min run.

1N4004 is a slow diode meant for mains rectification. Take a look at the specs, specifically junction capacitance and especially reverse recovery time. You want a diode that has a reverse recovery time measured in nanoseconds. The UF4007 comes to mind. small signal diodes (like 1n4148) come to mind for low currents and medium voltages, and schottky diodes come to mind for high currents and low to medium voltages.

Offline SalinsLV

  • High Voltage Enthusiast
  • *
  • Posts: 24
  • Karma: +1/-0
  • Electronics experience starting from 2015.
    • View Profile
Re: MOSFET Protection in SSTC
« Reply #4 on: June 04, 2021, 09:33:43 AM »
This circuit will result in a pile of dead mosfets if you're not careful(speaking from experience). You can try adding 1.5ke15ca at the gate and 1.5ke400ca at the source/drain. This slayer exciter is great for quick sparks but it can be hard to get longer sparks. The longest i've achieved were 40cm long.
K. Salins

High Voltage Forum

Re: MOSFET Protection in SSTC
« Reply #4 on: June 04, 2021, 09:33:43 AM »

 


* Recent Topics and Posts

post Re: Tesla Coil Show Controller Project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
Today at 11:13:18 AM
post Re: repair of Panasonic microwave inverter
[Electronic Circuits]
Weston
Today at 10:08:34 AM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 03:20:42 AM
post Re: repair of Panasonic microwave inverter
[Electronic Circuits]
Twospoons
Today at 03:16:27 AM
post 3kW Cisco Server Supply teardown and help needed
[Electronic Circuits]
Da_Stier
July 23, 2021, 09:23:11 PM
post Re: IGBT question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
July 23, 2021, 08:05:58 PM
post Re: IGBT question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
futurist
July 23, 2021, 07:02:18 PM
post Re: IGBT question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
July 23, 2021, 05:33:57 PM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GKnapp
July 23, 2021, 04:51:37 PM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 23, 2021, 03:52:46 AM
post Re: IGBT question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
July 22, 2021, 10:59:32 PM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GKnapp
July 22, 2021, 08:50:34 PM
post Re: IGBT question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
July 22, 2021, 08:47:23 PM
post Help needed - which IGBT module to buy
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
July 22, 2021, 07:01:24 PM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 22, 2021, 06:50:07 AM
post Re: Proper phase lead adjustment at the input
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 22, 2021, 06:39:37 AM
post Re: Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
July 21, 2021, 07:55:03 PM
post Horrible waveforms advice--just bad test setup?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GKnapp
July 21, 2021, 06:34:13 PM
post Re: Global shutter synchronized to arcs?
[DSLR]
Uspring
July 21, 2021, 05:10:18 PM
post Re: Tesla Coil Show Controller Project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
July 21, 2021, 12:42:29 PM
post Re: Proper phase lead adjustment at the input
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Chrisader
July 21, 2021, 08:15:00 AM
post Re: Proper phase lead adjustment at the input
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 21, 2021, 04:57:04 AM
post Re: Micro-power continuity checker.
[Electronic Circuits]
davekni
July 21, 2021, 03:50:33 AM
post Re: Skm flyback destroyer 🤗
[Transformer (Ferrite Core)]
oneKone
July 21, 2021, 01:50:19 AM
post Proper phase lead adjustment at the input
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Chrisader
July 20, 2021, 10:06:14 PM
post Re: Micro-power continuity checker.
[Electronic Circuits]
klugesmith
July 20, 2021, 06:24:29 PM
post Micro-power continuity checker.
[Electronic Circuits]
davekni
July 20, 2021, 05:37:36 AM
post Re: Help needed with SSTC. First TC build
[Solid State Tesla Coils (SSTC)]
davekni
July 20, 2021, 05:08:24 AM
post Re: Global shutter synchronized to arcs?
[DSLR]
davekni
July 20, 2021, 04:43:05 AM
post Re: Global shutter synchronized to arcs?
[DSLR]
TMaxElectronics
July 20, 2021, 12:09:36 AM
post Re: Help needed with SSTC. First TC build
[Solid State Tesla Coils (SSTC)]
AstRii
July 19, 2021, 11:13:13 PM
post Another question on CT Feedback
[Solid State Tesla Coils (SSTC)]
Maverikie
July 19, 2021, 08:56:04 PM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
newage
July 19, 2021, 07:09:56 PM
post Re: Global shutter synchronized to arcs?
[DSLR]
klugesmith
July 19, 2021, 06:49:08 PM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
klugesmith
July 19, 2021, 04:39:05 PM
post Global shutter synchronized to arcs?
[DSLR]
davekni
July 19, 2021, 06:32:35 AM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
July 19, 2021, 05:22:51 AM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
newage
July 19, 2021, 04:24:38 AM
post Re: a typical sstc half bridge design, any considerations or tips?
[Solid State Tesla Coils (SSTC)]
eli
July 19, 2021, 12:35:18 AM
post Re: a typical sstc half bridge design, any considerations or tips?
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
July 19, 2021, 12:15:43 AM
post a typical sstc half bridge design, any considerations or tips?
[Solid State Tesla Coils (SSTC)]
eli
July 18, 2021, 11:44:03 PM
post Re: HFSSTC design help and questions
[Solid State Tesla Coils (SSTC)]
eli
July 18, 2021, 09:33:40 PM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
johnf
July 18, 2021, 09:07:15 PM
post Re: Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
July 18, 2021, 03:38:01 PM
post Best and stable version of video
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Transgarp
July 18, 2021, 03:33:31 PM
post Sync RSG motor problems - help and thoughts needed
[Spark Gap Tesla Coils (SGTC)]
newage
July 18, 2021, 01:30:46 PM
post Re: DRSSTC design advise / Primary peak current calculation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
July 17, 2021, 10:05:39 AM
post Re: DRSSTC design advise / Primary peak current calculation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
July 16, 2021, 11:01:43 PM
post Re: DRSSTC design advise / Primary peak current calculation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Martin
July 16, 2021, 09:55:50 AM
post Re: Skm flyback destroyer 🤗
[Transformer (Ferrite Core)]
Patrick
July 16, 2021, 09:54:50 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 
SimplePortal 2.3.6 © 2008-2014, SimplePortal