Author Topic: UD2.7C outputs very odd single square wave pulses  (Read 176 times)

Offline verliebt_in_neukölln17

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UD2.7C outputs very odd single square wave pulses
« on: July 08, 2024, 10:21:01 PM »
Hey guys,
It’s me, yet again with UD troubles, was stoked that I finally had my UD working like intended this morning, well untill i fired it up for testing and it didn't wanna bother working properly now.

Gate drive output working properly earlier today:


Now:


The funny thing is, adjusting PW on my interrupter now changes the on-time of that single square wave.

iirc, this problem started to occur after i was testing my GDT out, there always seems to be problems with my driver after I test out GDTs.

So I started poking around on each FDD8424, and there seems to be an occuring pattern where the first and third FDD8424 mosfets that are responsible for the positive cycle of the waveform don't seem to be working now, the second and fourth are working completly fine.



 the non-working ones have adequate power on their pins and are not heating up, so I suspect there might be something wrong with the B signal after the phase jumper pins, this signal corresponds with the 74HC08 IC5A because I've inverted the phasing by moving the jumpers one up.



I'm quite an intermediate and I don't really know where to start troubleshooting first, so some help would be gladly appreciated,
Thanks.
« Last Edit: July 08, 2024, 10:54:27 PM by verliebt_in_neukölln17 »
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

Offline flyingperson23

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Re: UD2.7C outputs very odd single square wave pulses
« Reply #1 on: July 08, 2024, 11:30:44 PM »
Each fdd8424 has 2 mosfets, acting as a half bridge. The ud2.7 has 2 full bridge outputs, you only need 1. Check the signals on both the low and high side gates of the fdd8424 to see if they're getting the right signal. For the jumpers, make sure you're either connecting 1-3 and 2-4 or 3-5 and 4-6.

Are you sure you're giving it proper feedback? It would be good to verify that with the scope as well. The ud won't oscillate without correctly phased feedback
« Last Edit: July 08, 2024, 11:32:52 PM by flyingperson23 »

Offline verliebt_in_neukölln17

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Re: UD2.7C outputs very odd single square wave pulses
« Reply #2 on: July 09, 2024, 12:51:02 AM »
Hey,
I'm just simulating feedback with my function generator, although It worked just fine earlier today.
I'll look further into this the next day.
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

Offline flyingperson23

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Re: UD2.7C outputs very odd single square wave pulses
« Reply #3 on: July 09, 2024, 03:30:49 AM »
Make sure you're putting it into the feedback port and not the OCD

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Re: UD2.7C outputs very odd single square wave pulses
« Reply #3 on: July 09, 2024, 03:30:49 AM »

 


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