I have tested all the major signal points with DC power only and have all the proper signals. I just can't get the system to oscillate and produce HV. The secondary coil reads 255ohms, the primary has 5 turns. I tested and made sure the 2 capacitors get full and they do. I am getting the flip flop action on the primary of the gate drive transformer but the output of the gate driver transformer is zero.
Also, I have a 220v board that was modified for 110v with a wire from the negative of the two capacitors to the fuse. The fuse is not blown, The gate drive transformer does hum ever so lightly.
What should I be looking for?
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Debug Help
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Re: Debug Help
You should be using a 6-turn primary unless your secondary resistance is under 230 ohms. There was an issue with a batch of secondaries about a year ago where they were wound with wire having heavy-build insulation, resulting in too few turns and a skewed tuning point.
Have you tested your UCCs in both orientations?
Have you tested your UCCs in both orientations?
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Heidi - Supreme Leader
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Re: Debug Help
You had sent me an email before I finished the coil to check my secondary resistance which was 221. I used 5 turns in the primary because the secondary is under 230 ohms which I did.
I also swapped the UCCs and it made no difference.
I also swapped the UCCs and it made no difference.
- pascal88
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Re: Debug Help
Thank you
- pascal88
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Re: Debug Help
does anyone have some scope readings on this?
- pascal88
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Re: Debug Help
do not short the output of the bridge to ground!!!
scoping across the primary wont really show you anything.
how are you measuring the output of the GDT?
scoping across the primary wont really show you anything.
how are you measuring the output of the GDT?
- Alex
- Incredible IGBT
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Re: Debug Help
The output of the bridge is not grounded or shorted.
I used a scope across the GDT
I used a scope across the GDT
- pascal88
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Re: Debug Help
in your diagram you show that your scope probe ground clip was connected to the primary.
And yes, obviously you used a scope (:
but how are you scoping it? where is your ground clip? where is your scope probe?
And yes, obviously you used a scope (:
but how are you scoping it? where is your ground clip? where is your scope probe?
- Alex
- Incredible IGBT
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Re: Debug Help
I measured the resistance of R8 and R9 before I soldered them on the PCB, they were 6.8 ohm. I soldered them on and measure them again, one was 6.7 and the other measured 1.7ohm. I also checked the C-E of the IGBTs and they measured a short. Are the IGBTs fried? How do I test to see if the Gate Drive Transformer is wired properly?
Thank you.
Thank you.
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- pascal88
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Re: Debug Help
it appears that one of the IGBT was DOA that was causing all the problems I was having. I doubled checked everything and I just hope that I did not destroy the runs unsoldering some of the components to test...
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