Electronics > Beginners
DC bias in transformer
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Simon:

--- Quote from: MagicSmoker on October 13, 2019, 02:49:17 pm ---
But at this point I bet Simon is wishing he'd locked the thread rather than responded to it...  :-DD

--- End quote ---

I don't mind a genuinely useful discussion and the thread was not that long so fine to carry on. the problem is people reviving threads that are pages and pages long and have not been posted in for years. The initial revival was for a near pointless post but if something comes of it all the better.
AVGresponding:

--- Quote from: MagicSmoker on October 13, 2019, 02:49:17 pm ---
--- Quote from: ThickPhilM on October 13, 2019, 02:22:54 pm ---...
Anyway, back on-topic, if you're worried about dc bias on your transformer, stick a big-arsed cap in series with the primary. Problem solved   :horse:[/b]

--- End quote ---

No, that just prevents the mains from seeing the saturated transformer as an abnormally high load; put the capacitor in series with the secondary and restore balanced operation completely. In fact, pretty much all microwave ovens with a mains transformer instead of an inverter use this trick for the half-wave doubler.

Also note that most distribution transformers located closest to the point of use have a small gap in the core to prevent hard saturation from a little DC bias in the first place (at the expense of drawing a higher magnetizing current from having a reduced magnetizing inductance).

But at this point I bet Simon is wishing he'd locked the thread rather than responded to it...  :-DD

--- End quote ---


I would argue that putting a big cap on the primary side prevents the transformer from becoming saturated and therefore an abnormal load, and that putting one on the secondary side is a compromise as you can use a smaller, and hence cheaper, cap...

Until the "Your momma" jokes start, I see no reason to close the thread   :popcorn:
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