Author Topic: Help needed with SSTC. First TC build  (Read 444 times)

Offline Maverikie

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Help needed with SSTC. First TC build
« on: April 16, 2021, 09:22:47 PM »
Dear HV member,

I'm new in the TC coil business. I'm trying to build a SSTC with inspiration from SSTC 5 from Steve Ward and SSTC 2 from Loneoceans. Ofcourse I have deviated from the suggested schematics.  ;D

So i've build the interrupter based on a ATTiny and the driver is based on two UCC37322P chips. One inverted by a SN74HC14N. It seems that the interrupter and driver are working fine. I think I've problems with the half bridge consisting of two IRGP50B60PD1.

So when I try to turn everything on, it's drawing a lot of current via the Variac. See below the schematic.



I used my scope to measure the following:

First pic.1: Gate of Q1
2: Gate of Q2
3: Input signal generator sine wave 150 khz
Second pic.1: Output UCC37322P without GDT
2: Output UCC37322P without GDT inverted
3: Input signal generator sine wave 150 khz.




Below pictures of the general setup:












Online davekni

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Re: Help needed with SSTC. First TC build
« Reply #1 on: April 17, 2021, 05:36:49 AM »
First issue appears to be wrong core type for GDT (and likely CT too).  Cores must be high-permeability ferrite, not powdered iron.  Mads has a good GDT tutorial, with links to it in several of his posts.  (Other GDT and CT construction info is around too - do some searching.)  Besides core type, it is best to have a 1:1:1 turns ratio wound with twisted-pair wire for low parasitic inductance (with gate-driver chip input power at 15V for IGBT drive).  1:2:2 can be constructed with reasonably-low parasitic inductance, but that is a bit more tricky and increases gate-driver load.

Second likely issue:  I don't see any insulating pad under IGBTs.  They need either insulation or separate insulated heat sinks.  The bottom surface is electrically connected to collector.

Plug-board construction is often problematic, especially for gate-driver chips with their high switching current peaks.  However, your construction is the cleanest I've seen for plug-boards, so you may be fine with that.

If you haven't tried JavaTC, that is a good idea to check your coil parameters for reasonability.

Great documentation with detailed pictures and scope traces!  That makes assistance so much easier than for many initial requests.
David Knierim

Offline Mads Barnkob

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Re: Help needed with SSTC. First TC build
« Reply #2 on: April 17, 2021, 09:34:02 AM »
Hi Maverikie and welcome to HVF :)

Davekni is fast and catches it all before any other can even finish sleep to reply ;)

Your IGBTs are not insulated, on page 10 you can see that the cooling connection on the back of it is assigned to Drain: https://www.infineon.com/dgdl/Infineon-IRGP50B60PD1-DataSheet-v01_00-EN.pdf?fileId=5546d462533600a401535656c5e9248a you you are effectively shorting out your two drain channels.

The GDT troubleshooting guide is written by Richie Burnett: http://www.richieburnett.co.uk/temp/gdt/gdt2.html
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Offline Maverikie

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Re: Help needed with SSTC. First TC build
« Reply #3 on: April 17, 2021, 07:20:58 PM »
Thanks a lot! Stupid mistake :-[.

I found out that I fried my IGTB's, but I had foreseen some rookie moves, so I already bought two extra ones.

When I replaced the originals I tested and got my first spark!! 8) 8)

I checked the waveform of my GDT and it seems good. See scope pic.

But right now I have problems with my heating boiler. Seems it doesn't like the RF noise on the mains ground. In my situation it's quite hard to have a separate RF grounding rod installed. I'm reading something about a line filter can be used to suppress the voltage spikes to mains ground. Anyone experience about this?




Online davekni

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Re: Help needed with SSTC. First TC build
« Reply #4 on: April 18, 2021, 01:24:59 AM »
Quote
Davekni is fast and catches it all before any other can even finish sleep to reply
Yes, I live in Oregon (west coast of USA), so in one of the later time-zones of forum users.  My evening-time covers almost anything posted throughout the day.  You have many more tutorials and examples of coil builds - more helpful in many cases than my myopic focus on specific issues and questions.

Quote
I checked the waveform of my GDT and it seems good. See scope pic.
Yes, I agree.  Fried IGBTs is a reasonable explanation for your previous gate waveforms rather than inappropriate GDT core choice.

Congratulations on first sparks!
David Knierim

Offline Maverikie

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Re: Help needed with SSTC. First TC build
« Reply #5 on: April 28, 2021, 10:14:06 PM »
It's working finally! Full power.

The interrupter circuit based on Attiny performed not so well. At higher power the input pins of the drivers went self-oscillating. And the Attiny turned itself of. I tried to shield it but didn't succeed. Any suggestions?

I tried the NE555 circuit from Steve Ward and it worked wonderful!


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Re: Help needed with SSTC. First TC build
« Reply #5 on: April 28, 2021, 10:14:06 PM »

 


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