Electronics > Beginners
Why 2 transformers? (pic)
billbyrd1945:
Been working on the wine cooler PSU for some months now. I've obviously made it a learning project having spent more already than it's worth. Loving every minute of it. I try to research rather than ask on forums. Not having any luck figuring this one out though. I understand the basics of how a transformer uses opposing coils to step up or step down a voltage.
What I don't understand is why I would need two transformers on one power supply. If someone can answer that one, I have a couple of follow up questions about how these particular transformers even work. They definitely don't work as I thought. Thanks for any help.
ataradov:
This is a switching mode power supply, so transformers here are not used like in a conventional linear power supplies.
It would be hard to tell why this design uses two transformers. It may be for feedback reasons, but that would be unusual way to do that.
You need to draw the schematic of the primary side. It will be obvious then. It is trivial to do with a single sided PCB.
tautech:
Maybe to supply a standby power rail.
A bit of RE should make it obvious.
billbyrd1945:
I don't know what RE means. But here's the schematic:
wraper:
Smaller transformer is for driving bases of power transistors (primary side) from the secondary side where SMPS controller chip is located.
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