Hi Jay,
> How can you be certain the secondaries will be in phase
> with each other? They most certainly won't be if they
> aren't identically wound (hard to do even when you wind
> on the same core).
They will either be in, or exactly 180 degrees out. Just swap two
leads, and you are in business.
> And what will you do to prevent the fields from interacting
> to buck or boost in close proximity to each other?
Can't happen. If flux leakage was that bad, the transformers would
be totally useless in this application.
> Also you will have to insure that the PIV of the stacks aren't
> exceeded. And here is the kicker: If the outputs are not nearly in
> phase, each winding will be carrying greater than half the load at
> some part of the cycle! Consider that if the windings are exactly 0
> or 180 deg out of phase with full wave, then no problem. Ok if
> exactly in phase with a half wave stack. But each transformer will
> carry the full load when the other isn't!
The only transformers exhibiting phase shift are those with
significant flux leakage and/or those that are tuned with a capacitor
and not "resonant". A transformer like that would be useless in this
application.
73, Tom W8JI
w8ji@contesting.com
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