Author Topic: ud2.7 and 80mm bridge plus+ gdts connections  (Read 244 times)

Offline costas_p

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ud2.7 and 80mm bridge plus+ gdts connections
« on: December 11, 2021, 02:29:06 PM »
I would like to ask sorry for the community about starting many posts lately, but I have question that need answers/confirmations - i hope to not break any forum rules by doing so.

So I have build profdc9 tht version of ud2.7c, and Loneoceans 80mmh bridge plus+, and want to connect it

Loneocean's board is has 2 GDT where its "GDTs phasing" is with the red dot in the image I have attached.
UD 2.7c THT has a single output stage.
In order to operate Q1/Q4 and Q2/Q3 IGBTs correctly, how should I connect points A/B/C/D/E/F ? (also drawn in attached image)

I assume point A goes with D and F, where point B goes to C and E
Because if I understand correctly, connecting phasings as is (eg. A to E and D),  there is going to be a short circuit between Q1 and Q3, am I correct ?


Papadakis Costas

Offline alan sailer

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Re: ud2.7 and 80mm bridge plus+ gdts connections
« Reply #1 on: December 11, 2021, 10:23:41 PM »
When I buitl the UD2.7 thru hole I had the question of the difference between loneoceans (which had two GDT drive outputs) and the
thru hole which only has one.

I found that putting the two GDT in parallel worked just fine.

As far as the second question I can't answer that. Your talking about phasing the outputs of the GDTs correctly. I used a pulse generator to drive the
GDTs (all by themselves, no PC board) by checking the output of the GDT you can see what the output phase is and connect them correctly. You can
also physically look at the wires (if you used twisted bundles of wires) and see what the correct phase is.

Another more risky method is to use a Variac. If slowly turning up the voltage causes signs of a short circuit, you have the wrong phasing.

I initially spent a lot of time worrying over the phasing of GDTs. It can be kind of nerve wracking the first time but after that it becomes much more
routine.

Cheers.

Offline costas_p

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Re: ud2.7 and 80mm bridge plus+ gdts connections
« Reply #2 on: December 13, 2021, 07:27:49 PM »
Thanks again for the response Alan Sailer.

Since you have build the ud2.7c tht version, I am probably having some more questions in the near future.

Probably even if I make phasing wrong Q1-Q3 and Q2-Q4 are gonna short circuit to Vbus+ and Vbus- respectively, so I dont think its going to be a problem , or anything going to be damaged, just no output.

An electronic co-worker in the building I am working said I can also use a DC power supply with current limiting to check before applying mains power.
Papadakis Costas

High Voltage Forum

Re: ud2.7 and 80mm bridge plus+ gdts connections
« Reply #2 on: December 13, 2021, 07:27:49 PM »

 


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