Author Topic: Improving IGBT gate drive  (Read 573 times)

Offline Nijin

  • High Voltage Enthusiast
  • *
  • Posts: 18
  • Karma: +1/-0
    • View Profile
Improving IGBT gate drive
« on: May 17, 2020, 11:53:54 AM »
Hi guys !

I'm working on my drsstc and after many researches on how to drive an igbt, i want to share with you a new design of the IGBT gate drive circuit. This circuit can be use to drive efficiently one or more IGBT in parallel.

Motivation :
New technologies of IGBT are more suitable for paralleling operations. When you want to build small to medium power SSTC, you can choose between IGBT module or TO247. As TO247 are cheaper, it could be a better choice to use two or more TO247 in parallel than using an IGBT module, especially if you want to drive them at high frequency.


Since I design DRSSTC, the most efficient gate driver circuit I saw is the circuit with a diode to shunt the gate resistance. The aim of the diode is to reduce the gate resistance when discharging the gate to turn off quickly the IGBT. But the reduction of this resistance increase the voltage on the gate because the RLC circuit of the driver is under-damped.


To solve this problem, instead of using a diode, you can use a PNP transistor close to the gate to short it. The discharge current will no longer go through the GDT and the current path will have a smaller loop which means a smaller parasitic inductance. You can find more information on the TI application report "Fundamentals of MOSFET and IGBT Gate Driver Circuits".


The other improvement is the current balancing in parallel operation. When paralleling IGBT, some stray inductance is present at the emitter of the IGBT modules. The value of stray inductance for
the two IGBTs could differ. Because the IGBTs are connected in parallel, the common ground voltage will remain the same for both the IGBTs but the auxiliary emitter voltages will differ. This voltage difference between the auxiliary emitter terminals of the two IGBTs results in current flow from one terminal to the other. Depending on the direction of the circulating current the actual voltage at the IGBT gates will either increase or decrease resulting in unequal current sharing.
To overcome this problem, you can use a emitter resistor to help attenuating the circulating current or/and use a common-mode choke in the gate path.

This lead me to design this gate driver circuit.

It requires only 3 additional components to improve the driving. and if you just want to use it to drive one transistor, you can simply solder jumper instead of the common mode choke.


To finish the design of this driver, i still need to find a reference for the D1, Q2 and L1.

Tell me what do you think about this circuit and if you have any comments :)

If you are curious you can find more information on this paper :
- TI Designs "IGBT Gate Driver Reference Design for Parallel IGBTs With Short-Circuit Protection and External BJT Buffer" TIDUC70A
- TI Application Report "Fundamentals of MOSFET and IGBT Gate Driver Circuits" SLUA618A
Everything is a fuse if you pass enough current

Offline fnordest

  • High Voltage Enthusiast
  • *
  • Posts: 17
  • Karma: +0/-0
    • View Profile
Re: Improving IGBT gate drive
« Reply #1 on: May 27, 2020, 12:11:06 PM »
This looks interesting. I don't have any inverters with parallel IGBTs yet but some nasty overshoot during gate-turnoff. Have you run a simulation to get some parameters? I will have a look at it when i am in my workshop next week.

Offline Nijin

  • High Voltage Enthusiast
  • *
  • Posts: 18
  • Karma: +1/-0
    • View Profile
Re: Improving IGBT gate drive
« Reply #2 on: June 06, 2020, 10:20:31 AM »
I made a simple simulation with falstad to choose the PNP transistor but i not saved it.
You can find how to choose Re in the application notes. For L1, i'm looking for a Coilcraft common choke. The impedance of the differential mode of L1 at the resonant frequency need to be very small or it will slower IGBT commutation.You can choose a choke with a large bandwidth above the resonant frequency.
Everything is a fuse if you pass enough current

High Voltage Forum

Re: Improving IGBT gate drive
« Reply #2 on: June 06, 2020, 10:20:31 AM »

 


* Recent Topics and Posts

post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 03:29:14 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
buchtawill
Today at 02:43:33 AM
post Re: SKP DRSSTC = aliexpress driver + medium coil + large bricks ;)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
December 01, 2020, 10:44:31 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
December 01, 2020, 07:44:14 PM
post Re: transistor markings question
[Beginners]
davekni
December 01, 2020, 07:39:48 PM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 01, 2020, 07:38:53 PM
post Re: How to design FPGA based on EDA technology?
[Electronic Circuits]
petespaco
December 01, 2020, 06:30:33 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 04:58:29 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 04:22:10 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 03:02:51 PM
post Re: Half-brigde with pot on mosfet gates question
[Solid State Tesla Coils (SSTC)]
TMaxElectronics
December 01, 2020, 12:08:56 PM
post transistor markings question
[Beginners]
NOOBPASTE51
December 01, 2020, 12:02:19 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 11:55:01 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 11:50:19 AM
post Re: Analog HFBR amplifier
[Electronic Circuits]
TMaxElectronics
December 01, 2020, 11:21:56 AM
post Half-brigde with pot on mosfet gates question
[Solid State Tesla Coils (SSTC)]
costas_p
December 01, 2020, 11:17:16 AM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 11:11:50 AM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
December 01, 2020, 09:29:24 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
johnf
December 01, 2020, 07:03:56 AM
post Re: How to design FPGA based on EDA technology?
[Electronic Circuits]
johnf
December 01, 2020, 06:49:26 AM
post Re: SSTC or DRSSTC with GaN Transistors
[Solid State Tesla Coils (SSTC)]
Steve Ward
December 01, 2020, 04:59:28 AM
post How to design FPGA based on EDA technology?
[Electronic Circuits]
Genterman
December 01, 2020, 04:02:06 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 01, 2020, 03:46:10 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
buchtawill
December 01, 2020, 02:00:54 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Steve Ward
December 01, 2020, 01:47:10 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 01, 2020, 12:02:23 AM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Mads Barnkob
November 30, 2020, 10:28:56 PM
post Re: I started making a drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Miki_407
November 30, 2020, 08:58:41 PM
post DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
buchtawill
November 30, 2020, 08:53:00 PM
post Re: I started making a drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 30, 2020, 08:49:30 PM
post Re: Simple H-Bridge construction with low parasitic inductances (for SSTC or ...)
[Beginners]
davekni
November 30, 2020, 08:45:46 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
November 30, 2020, 06:56:13 PM
post Re: I started making a drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Miki_407
November 30, 2020, 01:16:04 PM
post Re: I started making a drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
November 30, 2020, 12:56:05 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
November 30, 2020, 12:03:06 PM
post I started making a drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Miki_407
November 30, 2020, 11:58:29 AM
post Re: Interesting 2400W power supply circuit
[Electronic Circuits]
Kiki
November 30, 2020, 07:58:52 AM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 30, 2020, 06:37:23 AM
post Re: Analog HFBR amplifier
[Electronic Circuits]
USAMAN
November 30, 2020, 03:07:30 AM
post Re: SKP DRSSTC = aliexpress driver + medium coil + large bricks ;)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
November 29, 2020, 08:14:37 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
November 29, 2020, 08:04:33 PM
post Re: QCW with replaceable ferrite-core primary
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
November 29, 2020, 08:04:01 PM
post Re: steam engine
[Capacitor Banks]
plasma
November 29, 2020, 03:04:07 PM
post Re: steam engine
[Capacitor Banks]
Max
November 29, 2020, 11:51:37 AM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
November 29, 2020, 07:30:41 AM
post Re: steam engine
[Capacitor Banks]
davekni
November 28, 2020, 11:56:04 PM
post Re: steam engine
[Capacitor Banks]
Twospoons
November 28, 2020, 11:03:54 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
November 28, 2020, 07:45:38 PM
post Re: Setting over current protection for my drsstc
[Dual Resonant Solid State Tesla coils (DRSSTC)]
octopus1
November 28, 2020, 06:54:18 PM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Da_Stier
November 28, 2020, 06:32:22 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