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...If there are any left, that is, paying attention to this List.
1. Years back I made a way-too-complex s.s. coil, involving several
multi-TO220-MOSFET assemblies, daisy-chain-connected into one equivalent
primary coil. It finally worked but its mtbf was way too short and I
finally tossed it.
2. Now I'm trying to re-create the general idea, with just a single
pair of much-huskier MOSFETs per module, and employing such 4 modules.
Ref. my earlier posting this year. Each is to operate from the rectified
and doubled mains--in my case around 300+ V. A single one currently
works on the bench, driving at least ~200A p-p~5 ms pulse-bursts into a
single 12" diameter coil, at ~100 KHz and ~5% d.c.
3. It occurs to me that rather than daisy-chaining the ultimate 4
modules into 1 equivalent full-diameter primary coil (to yield an ~1200V
source applied to the primary) it would be muchsimplerelectrically to
establish 4 synchronized parallel primary flux-paths passing through the
one secondary. Four primary coils would be used, each one occupying a
90 degree quadrant of the full secondary diameterand situated in the
same plane. All4 MOSFET-module/primary-coil groups would be identical
and driven from the same ~300V and l.v. gatesources. Eachprimary coil's
turn-quantity would be sized to yield the maximum
pulse-burst-duration/duty-cycle that the MOSFETs would accommodate.
Seems to me that the respective synchronized fluxes would have minimal
interaction while trraveling through the secondary, so the resultant
total flux would be of more or less the same magnitude as if I were to
daisy-chain the 4 modules into a single equivalent primary coil of ~4x
the c.s. area.