Author Topic: SSTC or DRSSTC with GaN Transistors  (Read 714 times)

Offline Zipdox

  • High Voltage Technician
  • ***
  • Posts: 102
  • Karma: +1/-0
    • View Profile
    • Zipdox
SSTC or DRSSTC with GaN Transistors
« on: September 16, 2020, 10:36:08 PM »
Has anyone ever built a solid state coil with gallium nitride transistors? I would assume that using more efficient transistors would reduce the need for cooling and risk of damaging them.

I've looked at a company that makes them called Transphorm and their FETs are only about 3x as expensive as regular silicon FETs for the same current rating (compared to IRFP460), at a slightly higher voltage. What's interesting is that they can cram a lot of current capability into small packages because of the high efficiency.

Let me know what you think.
« Last Edit: September 16, 2020, 10:38:55 PM by Zipdox »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1526
  • Karma: +27/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: SSTC or DRSSTC with GaN Transistors
« Reply #1 on: September 17, 2020, 10:23:29 AM »
I think I have seen around 3-4 designs that was show-cased on social media or forums, I can not find links right now.

But I think its people like Steve Ward, Weston and Loneoceans that have built with GaN or SiC switches.
http://www.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 Weston

  • High Voltage Experimenter
  • **
  • Posts: 88
  • Karma: +7/-0
    • View Profile
Re: SSTC or DRSSTC with GaN Transistors
« Reply #2 on: September 17, 2020, 09:13:40 PM »
I used some GaN parts from GaN Systems for a small Class E tesla coil a few years ago and use GaN parts a lot for research.



If you are going to use wide bandgap semiconductors, I would suggest SiC parts instead of GaN. GaN parts are typically pretty fragile and do not survive voltage spikes well. The also typically have low thermal mass with an on resistance that significantly increases with temperature. The main advantage with GaN is faster switching, but most tesla coil designs have soft switching, so switching loss should be pretty low.

For either SiC or GaN you probably will not be able to use a gate drive transformer due to the higher switching speed and different gate voltage requirements.

The Transphorm parts are a cascode where you drive a Si MOSFET gate, which solves the issue of the weird voltage requirements for the GaN gate, but the parts are kind of funky and have issues with oscillation. Steve Ward experimented with these parts in the past and had issues with this. The app notes for those parts talk about all sorts of snubber networks that are required to not have things blow up.

Consider looking at SiC parts. They are a lot more robust that GaN and have a better on resistance temperature coefficient. I use a SiC FET module in my QCW tesla coil, where it allows me to hard switch ~70A at 500V for a phase shifted full bridge https://highvoltageforum.net/index.php?topic=1024




Offline Zipdox

  • High Voltage Technician
  • ***
  • Posts: 102
  • Karma: +1/-0
    • View Profile
    • Zipdox
Re: SSTC or DRSSTC with GaN Transistors
« Reply #3 on: September 18, 2020, 03:52:08 PM »
Hmmm I already imagined they'd be more fragile than regular silicon. In that case I think I'll stick to old fashioned silicon unless I ever feel a hole burning in my wallet and have more spare time.

Offline Hydron

  • Administrator
  • High Voltage Engineer
  • *****
  • Posts: 357
  • Karma: +11/-0
    • View Profile
Re: SSTC or DRSSTC with GaN Transistors
« Reply #4 on: September 18, 2020, 05:29:24 PM »
Moderately specified SiC parts aren't crazy money. $12.50 for a 1.2kV 75mR MOSFET is one part I'm looking at - not cheap but performs a lot better than silicon if you need a MOSFET rather than an IGBT.

You can still use smaller silicon IGBTs up to reasonably high frequencies (a few hundred kHz) if a 600/650V rating is enough, but if you need more voltage than this the switching loss goes up and speed goes down quickly!

High Voltage Forum

Re: SSTC or DRSSTC with GaN Transistors
« Reply #4 on: September 18, 2020, 05:29:24 PM »

 


* Recent Topics and Posts

post Re: CM600DU-24NF availability or substitute?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
October 20, 2020, 11:50:25 PM
post CM600DU-24NF availability or substitute?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
SAMGO
October 20, 2020, 10:50:25 PM
post Variable transformer, reverse engineering of 3A electronic fuse
[Laboratories, Equipment and Tools]
Mads Barnkob
October 20, 2020, 09:38:42 PM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
October 20, 2020, 05:08:29 PM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
RoadReaper
October 20, 2020, 03:17:48 AM
post Re: current limiting to parallel resonance circuit
[Beginners]
davekni
October 19, 2020, 11:02:11 PM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
October 19, 2020, 10:53:26 PM
post Re: Tesla coil circuit draws lots of current but the spark size is small.
[Solid State Tesla Coils (SSTC)]
davekni
October 19, 2020, 10:50:35 PM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Zipdox
October 19, 2020, 09:51:57 PM
post Re: current limiting to parallel resonance circuit
[Beginners]
Zipdox
October 19, 2020, 09:48:07 PM
post Re: Tesla coil circuit draws lots of current but the spark size is small.
[Solid State Tesla Coils (SSTC)]
SalinsLV
October 19, 2020, 07:27:59 PM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
October 19, 2020, 06:48:03 PM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
October 19, 2020, 03:54:00 PM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
October 19, 2020, 10:25:25 AM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Zipdox
October 19, 2020, 08:56:13 AM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Netzpfuscher
October 19, 2020, 07:54:05 AM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
October 19, 2020, 05:32:05 AM
post Re: DIY DC-10MHz optical-fiber-isolated scope probe
[Laboratories, Equipment and Tools]
davekni
October 19, 2020, 05:12:05 AM
post Re: Quasar60 DRSSTC build using universal driver/interupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
RoadReaper
October 19, 2020, 04:13:30 AM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
profdc9
October 19, 2020, 03:39:49 AM
post Re: 6" Coil Update now 72" and better lighting
[Spark Gap Tesla Coils (SGTC)]
Bradselph
October 19, 2020, 01:53:01 AM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
October 19, 2020, 12:36:38 AM
post Re: 10 kW Induction Stove Teardown, Huge SMEG 5-Zone Stove
[Electronic Circuits]
Max
October 18, 2020, 11:57:02 PM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
October 18, 2020, 11:14:53 PM
post 10 kW Induction Stove Teardown, Huge SMEG 5-Zone Stove
[Electronic Circuits]
Mads Barnkob
October 18, 2020, 10:42:01 PM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
profdc9
October 18, 2020, 09:54:48 PM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
johnf
October 18, 2020, 08:25:41 PM
post Re: UD2.9 skip pulse assembled
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
October 18, 2020, 03:28:04 PM
post Re: current limiting to parallel resonance circuit
[Beginners]
Hydron
October 18, 2020, 12:08:36 PM
post Re: current limiting to parallel resonance circuit
[Beginners]
plasma
October 18, 2020, 07:31:58 AM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
October 18, 2020, 07:18:08 AM
post Re: 6" Coil Update now 72" and better lighting
[Spark Gap Tesla Coils (SGTC)]
Mads Barnkob
October 18, 2020, 07:00:13 AM
post Re: DIY DC-10MHz optical-fiber-isolated scope probe
[Laboratories, Equipment and Tools]
Mads Barnkob
October 18, 2020, 06:50:25 AM
post Re: Gate resistor bypass diode on KaizerSSTC
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
October 18, 2020, 06:39:34 AM
post Re: current limiting to parallel resonance circuit
[Beginners]
davekni
October 18, 2020, 05:15:50 AM
post Re: current limiting to parallel resonance circuit
[Beginners]
Zipdox
October 17, 2020, 11:26:45 PM
post Re: 6" Coil Update now 72" and better lighting
[Spark Gap Tesla Coils (SGTC)]
Zipdox
October 17, 2020, 11:16:24 PM
post Re: steam engine
[Capacitor Banks]
plasma
October 17, 2020, 09:42:50 PM
post Re: steam engine
[Capacitor Banks]
davekni
October 17, 2020, 09:05:37 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
October 17, 2020, 08:23:11 PM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
October 17, 2020, 07:45:56 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
October 17, 2020, 03:26:32 PM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
October 17, 2020, 03:06:49 PM
post Re: steam engine
[Capacitor Banks]
plasma
October 17, 2020, 06:17:07 AM
post Re: steam engine
[Capacitor Banks]
davekni
October 17, 2020, 04:15:07 AM
post Re: Syntherrupter - Build by AstRii
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AstRii
October 16, 2020, 07:41:01 PM
post Re: steam engine
[Capacitor Banks]
plasma
October 16, 2020, 08:36:35 AM
post Re: 6" Coil Update now 72" and better lighting
[Spark Gap Tesla Coils (SGTC)]
Bradselph
October 15, 2020, 09:47:27 PM
post Re: steam engine
[Capacitor Banks]
Twospoons
October 15, 2020, 09:37:29 PM
post Re: Syntherrupter - Build by AstRii
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
October 15, 2020, 09:18:14 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