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Topics - TofikLupus

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1
Transformer (Ferrite Core) / TL494 Flyback driver oscillator section
« on: March 29, 2017, 09:28:20 PM »
Hello everyone,
I have no idea how old this forum is but i'm new here, so I hope i chose the correct section for this thread. Anyways, to my question.

Recently I was experimentally building the TL494 driving circuit according to this schematic:

I didn't have the Gate driver ICs so I experimentally tried to build a BD139/BD140 totem pole stage, which I used to drive the gates of IRFZ44N MOSFETs, which were then driving the GDT. The issue i got with this circuit is that if i use the pullup resistors, I basically get the inverted signal of what the output should actually be. In the push-pull mode, this results in the two signals overlapping each other whenever the duty cycle is less than 50% (which for the TL494 is always the case, because the dead time is set to be 5% at minimum). That means that the MOSFETs are in short circuit for the amount of time when the overlap happens. I drew a graph of what i mean, It's in the attachment.

So my question is, is it possible to avoid this behavior by using the TL494 as a high side switch and hook the totem pole stage in between the emitters and pulldown resistors?
Also, I ordered a couple of TC4420 drivers, which are the same thing as the MAX ones stated in the schematic, so when they arrive, I would like to use them for this circuit, but it makes me wonder if the same issue will affect the driver ICs. But that would mean that the original schematic is wrong, which I don't think it is, since it was proven to be working by the author itself. So i'd rather ask for some kind of explanation which could clear this all out to me. TC4420 are non-inverting drivers, so in my way of logic it should also suffer from the brief short circuits and should at least heat up significantly.

By the way, here's a photo of the circuit, it's on a breadboard, very messy but it was the initial build, which i tidied afterwards but i don't have any more recent photos.

I ordered all the chips from Aliexpress so I won't be able to try it out immediately but I will get back to you after i did try them.

Thank you all for your replies and suggestions, and have a nice day, I will be around.

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