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[TCML] Question for solid-staters

...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.

Can anyone shootthis down?

Ken Herrick
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