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Re: Air-core power transfomers
Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>
Tesla list wrote:
>
> Original poster: "Marry Krutsch by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>
>
> Hi all.
>
> I've been interested in those solid state MOTs ever since someone
here
> mentioned them. Since discarded microwaves are scarce around here
> (that, or someone is beating me to them ;-)), I wanted to make one
> myself to power a DC coil, and to feed smoother power to magnetrons.
>
> Anyway, I've got plenty of wire, but no ferrite for the core. Can I
> make an air core "MOT"? What are the potential problems with this?
> Should I let the inductive reactance of the primary limit the current,
> or should external limiting be used? Does air "saturate" the way iron
> does? I'm thinking that operation at 50 kHz or so is good. And now the
> stupid question: Does the primary (drive coil) need to be wrapped
> around the secondary (driven coil)? I thought that coupling would be
> better in this case, but really don't know. Thanks for any help.
>
> Winston
If you use high voltage FETS in a half bridge, you may be able to drive
the coil directly from the FETS through a blocking cap. I haven't tried
this, but its on my list of things to do. I don't fool around building
such power supplies. I just get a good >300W switcher, and cut the
board in half. Then feed my own signal into the FET gate-source
isolation transformers. Rob.
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