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Since the magnetron requires an optimum EMF, filtering is necessary.
i.e. a constant EMF, however, if the power is pulsed a filter cap
would defeat the purpose -- smoothing the supply and defeating the
constant value, reducing the efficiency of the magnetron. So the
last "thing" before the magnetron is the square wave switch w/
variable duty (or mark space ratio). The switch must be "fast".
I now see two points here, mine and CB (BW) inverter. Evidently
nothing to do w/ variable power, but the P/S, i.e. DC/DC HV P/S.
Now common in plug-in P/S and UPSs. The step-up/down done by a
ferrite toroid xformer. More efficient in-addition to low weight
and cost.
bc thinks no longer egg science