Author Topic: Try to make a full Bridge with IGBT and GDT  (Read 155 times)

Offline JCF

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Try to make a full Bridge with IGBT and GDT
« on: January 14, 2021, 06:11:06 PM »
Hello to all, I am recently on the forum.  I have a small Tesla coil made with 4 IRFP 460. I want make a new one with primaire 18cm (15 turn) et secondaire 55 cm (1000 turns)
For that I have 2 CM200DU1-2F IGBTs that I would like to use to make a full bridge.
see the signal on this 1 picture. I have a lot of parasitic peaks and a false signals on a 200 Ohm resistor which replace the primary to make a test at 50 v max ?
picture 2 signal on Gate IGBT



I do not know what to do now ?, I tested the 2 IGBTs, they are good, Signal of the four GDT secondary outputs on 1 kHoms correct ...




« Last Edit: January 14, 2021, 06:31:14 PM by JC78 »

Offline Pete57

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Re: Try to make a full Bridge with IGBT and GDT
« Reply #1 on: January 14, 2021, 08:39:06 PM »
Hi JC78.
I have just joined also, but have been building Tesla Coils for a long time.
Looking at your two waveform samples.
The first screenshot shows excessive low frequency ringing, (Transformer totally un-useable ). The second screenshot is better, but still has ringing and voltage spikes.
I think the best thing you can do is to wind a better Gate Drive Transformer.
I wind my GDTs using cat5 ( outer sheath removed ), cable around an Epcos N30 ferrite core.
I normally wind  11 to 13 turns around the core.  I use the CM200DY-12H IGBT bricks, and find that 11 turns around a 27mm o\d core normally works well.
Make sure you use purpose made snubber caps across C1\E2 of the igbt mods . These will help with the voltage spikes . Also, dont forget to add BI-DIRECTIONAL TVS DIODES across the Gate\Emitter junctions of each igbt. These help protect the gates from voltage spikes.
Hope this helps.

Offline Mads Barnkob

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Re: Try to make a full Bridge with IGBT and GDT
« Reply #2 on: January 15, 2021, 01:36:45 PM »
Hi JC78 and Pete, welcome to HVF!

You can not substitute the primary coil with a 200 Ohm resistor and expect the feedback / gate drive transformers to do their job correct, from a driver that expects a resonant LC feedback current. You need to test with about 100V on the DC bus to avoid excessive IGBT output capacitance ringing and get a proper feedback signal. Instead of a secondary coil that makes sparks, you can place a iron pot/container with water in as a dummy load.

To trouble shoot your GDT waveforms further, this is a great reference: http://www.richieburnett.co.uk/temp/gdt/gdt2.html
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
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Re: Try to make a full Bridge with IGBT and GDT
« Reply #2 on: January 15, 2021, 01:36:45 PM »

 


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