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Hi all,
I'm facing a similar issue.
I employ a ferrite-core transformer as output transformer to obtain galvanic separation in a SMPS.
My output voltage is discontinuous (e.g. 0.5 secs on, 1.5 secs off). When the circuit starts conducting (e.g. at the beginning of the 0.5 secs) the transformer...
I also employed 4.7-ohm resistors between the drives and the gates.
I don't think a resistance between gate and source terminals is necessary.
I forgot mentioning that ground loops must also be avoided!!!
This is a very common issue in SMPS designs. I blew up tens of MOSFETs trying to make them working properly...
This is a thread I posted some months ago:
https://www.edaboard.com/threads/280785/
From the best of my knowledge, I think you should review the board design: reduce track lengths to...
Ooops! You are right. Copy-paste this one:
https://www.ferroxcube.com/appl/info/HB2009.pdf
Or go to https://www.ferroxcube.com/ --> Application Info --> Data handbook_Soft ferrites & accessories
I thought these ones
**broken link removed**
acted as two series inductors, by connecting them this way:
So you suggest a plain inductor, as in the diagram above the core easily saturates?
Hi!
Why don't you give a look to some constructors' handbooks?
This one, for example, is from Ferroxcube:
https://www.ferroxcube.com/appl/info/HB2009.pdf
First pages provide good pratical information for inductor design.
Thank you BradtheRad for your reply.
FvM, I did not considered the issue you mention:
but it is true. I think I will simply revert back to my single phase design.
Do you think the choke as shown below is a good idea?
Thank you all very much!
This should not be an issue since I will arrange a soft start circuit.
100 mH choke provides an output voltage that is, unfortunately, too low for my purposes.
What about putting it between the bridge and the capacitor? May it resonate with the inverter, causing some...
Thank you FvM, you are correct! Although my inverter is not VFD.
If the ripple current has to be evaluated as an RMS value, than it turns out to be roughly 55 A without the inductor, 32 A with the choke.
Do you think it is a good choice, then?
Thanks!
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