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Greg, "father dest" et al-
On further reflection I've concluded that the only way to get more
magnetic flux into a single secondary is to increase the applied voltage
to a single (equivalent) primary coil.
In simulation, I take a single 120 KHz voltage source, apply it
paralleled to 2 primaries of a 3-coil, 500 uH (each coil) transformer,
and measure the secondary current. First, I set the primary:primary k =
1, the primary:secondary k = 1, the primary resistances to 10 ohms, and
the secondary resistance to 1K ohm. I get ~30 mA p-p in the secondary.
Next I disconnect one of the primaries. I get ~30 mA again, as
expected. The only effect of the two primaries in this case, in
hardware (each having 377 ohms of reactance), would be cutting in half
the effective primary impedance which, with a 1 k ohm secondary load,
has negligible effect.
Next, I set primary:primary k to 0.5 andalso primary:secondary k to
0.5. That's what I'd overlooked before: when one attempts to reduce the
primary:primary k, I think it's inevitable that the primary:secondary k
will be reduced commensurately. I'll be pleased to stand corrected.
The result here is ~21 mA p-p.
Finally, I set the primary:primary k to 0.2 while keeping the
primary:secondary k at 0.5. Now I get ~27 mA p-p. And when I set
primary:primary k to 0.1 leaving secondary k the same, I'm back to ~30
mA p-p. But that is, I think, an impossibility in hardware.
Clearly, placing twice (or 4x) the applied voltage across just 1of the
primaries will be a trivial test: it will result in that much more
secondary current. That's what I expect to do this time with the 4
driving modules.