Author Topic: full bridge help  (Read 912 times)

Offline ktnch

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full bridge help
« on: August 31, 2020, 12:05:35 PM »
New on the forum trying to sort my full bridge out. keeps blowing igbts few pics below of the set up also the full bridge design

i have 2 set ups one using 4 x 40n120fl3 and the other using 40n60smdf.


Supply is off a variac with 50amp bridge seems its always a2,b2 igbts that keep failing


kev

Offline AstRii

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Re: full bridge help
« Reply #1 on: August 31, 2020, 07:41:46 PM »
Is the GDT phasing correct?
Make sure your GDT is never switching Q3, Q1 with the same phase. Same thing applies for Q2,Q4.
This creates cross conduction and eventually destruction of your IGBTs.

More details would be helpful.
For example, pictures of scoped waveforms of the gates (G-E) of your bridge.
Marek Novotny
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www.uhvlab.org

Offline Zipdox

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Re: full bridge help
« Reply #2 on: September 03, 2020, 10:13:44 AM »
Is the GDT phasing correct?
Make sure your GDT is never switching Q3, Q1 with the same phase. Same thing applies for Q2,Q4.
This creates cross conduction and eventually destruction of your IGBTs.

More details would be helpful.
For example, pictures of scoped waveforms of the gates (G-E) of your bridge.
That's what I thought. If you're unsure about the phasing and don't want to unwind the GDT, you can connect the "minus" of two outputs together and measure with an oscilloscope between the two "plus" wires. If they're the same phase you won't measure anything between them. If you measure a clear signal then they're he opposite phase. Swap one of them to make sure. When they're the same phase, mark the "minus" wire with a sharpie on each pair. When you've phased the output pairs, you can do the same with the input pair.

Also, you should twist all the gate drive wires to mitigate interference and crosstalk. Right now they're all loose.
« Last Edit: September 03, 2020, 10:15:52 AM by Zipdox »

Offline Arcatarter

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Re: full bridge help
« Reply #3 on: December 24, 2020, 12:03:04 AM »
As the others have said, I am also wondering about the gate drive. Wrong phasing or shoot through from a lack of dead time can cause issues. If the circuit works sometimes, I wondering if you could be getting some ringing and voltage spikes on the DC buss...

I need more information to be more helpful. Does your circuit work to some degree, or does it let the smoke out immediately upon powering up? If it does run for some amount of time, is there any way you can provide waveforms from the gate and on the DC buss? Any information you can supply would be great!

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Re: full bridge help
« Reply #3 on: December 24, 2020, 12:03:04 AM »

 


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