Re: [Phys-l] egg science

[Bernard Cleyet <bernardcleyet@redshift.com>]

On 2012, Apr 09, , at 06:40, chuck britton wrote:

> My suspicion is that the inverter-ovens have the identical magnetron 
> tubes but a more complicated source for the current and voltage 
> applied thereunto.
>
> Driving the power transformer with a higher frequency allows a 
> significantly less massive core to provide the same power.
>
> The only 'filter cap's' might be in the line cord connection module.
> .


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
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