Author Topic: Coil not working  (Read 563 times)

Offline flyingperson23

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Coil not working
« on: October 08, 2022, 08:59:18 PM »
I was trying to tune my coil and it just stopped working. One of the transistors that drives the gdt failed so I fixed that but it's still not working. The feedback signal is all weird. Im supplementing the feedback transformer with a function generator and getting the attached waveforms across the output. The ud is verified working fine now. Does this look like transistor failure or is it just really detuned or am I missing something?

Offline davekni

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Re: Coil not working
« Reply #1 on: October 09, 2022, 01:42:51 AM »
Quote
across the output
Please specify what is being measured here.  Is this UD2.7 output?  Or H-bridge output?  Are the two scope traces for the two UD2.7 outputs, each with scope probe ground connected to UD2.7 ground?  Or, a differential probe measuring between the two UD2.7 outputs?

Quote
The ud is verified working fine now.
How are you certain of this?  In other words, how did you test UD2.7 to verify it is working?
David Knierim

Offline flyingperson23

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Re: Coil not working
« Reply #2 on: October 09, 2022, 04:15:52 AM »
The 2 scope traces are both differential measurements across the igbt outputs. I say the ud is working because when I gave it an interrupter signal and feedback from my function generator it outputted the square wave that it should. These scope measurements are after I checked that the igbts are getting the proper square wave signals on their gates.

Offline davekni

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Re: Coil not working
« Reply #3 on: October 09, 2022, 05:00:48 AM »
Quote
The 2 scope traces are both differential measurements across the igbt outputs.
Do you have a differential probe?  If not, are you certain that either your scope is floating or your UD2.7 supply is floating (not tied to ground)?  Even if one or the other is floating, connecting a scope "ground" lead to an active node such as UD2.7 output can cause problems.  There may be significant capacitance to ground inside supply or scope even without a direct ground connection.  However, UD2.7 output impedance is low enough that scope/supply ground capacitance shouldn't be too significant.

BTW, scoping each UD2.7 output separately with scope ground clipped to UD2.7 ground makes it easier to decipher what may be going wrong.

Quote
I say the ud is working because when I gave it an interrupter signal and feedback from my function generator it outputted the square wave that it should. These scope measurements are after I checked that the igbts are getting the proper square wave signals on their gates.
It's clear there is still a problem with either UD2.7 or IGBTs.  Perhaps something failed since your signal-generator test.
For your signal-generator test, did you look at the start and end of interrupter enable pulses?  Some UD2.7 failures show up only at start or end.
David Knierim

Offline flyingperson23

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Re: Coil not working
« Reply #4 on: October 09, 2022, 05:08:29 AM »
I don't have a differential probe but I'm using one of the 2 prong to 3 prong 120v adapters to power my scope so it's definitely floating. I looked at the start and end of pulses and they seem fine. I did buy both cm300du-24h bricks off eBay, so they've likely been used and might have failed but I don't know why they would've.

Offline flyingperson23

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Re: Coil not working
« Reply #5 on: October 09, 2022, 03:52:16 PM »
I got more scope traces. The first is c2e1 of both of the bricks (they're the same) with reference to the negative bus. The second may be why I'm having problems - it's the waveform across the gate of each transistor - again they're all the same, but it goes well above the 24v it should. Im feeding a clean 24v square wave into the gdt, but getting this as the output? Is this something that could cause failure and why would this be happening?

Offline davekni

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Re: Coil not working
« Reply #6 on: October 09, 2022, 09:23:10 PM »
Quote
The second may be why I'm having problems - it's the waveform across the gate of each transistor - again they're all the same, but it goes well above the 24v it should.
Looks a bit like a collector-gate short on one of the IGBTs, probably one of the high-side ones.  This is just my guess looking at your waveforms.
David Knierim

Offline flyingperson23

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Re: Coil not working
« Reply #7 on: October 09, 2022, 09:45:09 PM »
Is there any reason why that would've happened?

Offline flyingperson23

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Re: Coil not working
« Reply #8 on: October 10, 2022, 12:20:21 AM »
So I found the problem.
I can't find any cm300du-24h bricks on eBay. Are there any relatively cheap alternatives with the same pinout?

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Re: Coil not working
« Reply #8 on: October 10, 2022, 12:20:21 AM »

 


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