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Re: Full Wave Voltage Doubler with MOTs

Comment

An option I've used with success (could also be used in conjuntion with some DC
options) is to use 4 MOT in 2 phased pairs each with the outer secondary
floating
and in series with an unmodified MOT. Needed to select the outer MOT
carefully for
good isolation of the secondary to the core and also placed this XFRMR in
an oil
bath (made from 6" PVC plumbing bits, the MOTS just fit in nicely)

Also used good RF decoupling from the Tesla. This arrangement gives about
4.5kVAC
per side being 9kVAC. This could of course be rectified in a voltage doubler.

Tesla List wrote:

> Original Poster: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi>
>
> Tesla List <tesla-at-pupman-dot-com> on 04.01.2000 14:57:13
>
> To:   tesla-at-pupman-dot-com
> cc:    (bcc: Marco Denicolai/MARTIS)
> Subject:  Re: Full Wave Voltage Doubler with MOTs
>
> >Original Poster: "Tero Ranta" <tero.ranta-at-bigfoot-dot-com>
>
> >Marco,
>
> >it's not the same! There are lots of types of doubler topologies, half-wave,
> >full-wave, genuine full-wave and then there are things called "level
> >shifters".
>
> >Your doubler circuit is a level shifter.
>
> >I have simulated many kinds of doubler topologies and found IMO the best way
> >(least parts). It produces quite smooth _steady_ 11kVDC, opposed to the
> >pulsed dc you achieve with your circuit.
>
> >Here's the schematic (4 diodes and 4 caps):
>
> o---------------
>                |
>        -----*----------o +
> MOT    |    |  |
>        D    C  |
>        |    |  |
> o------*    *--|
>        |    |
>        D    C
>        |    |
>        *----*----------o gnd
>        |    |
>        D    C
>        |    |
> o------*    *--|
>        |    |  |
>        D    C  |
> MOT    |    |  |
>        -----*----------o -
>                |
> o---------------
>
> >Please let me know if you think there is something wrong with my schematic
> >or if you know a better way making it.
>
> I didn't have time to simulate your circuit, but it looks a great idea to me.
> Good! You can achieve real DC (not pulsed) also with my solution, but you
have
> to invert the phase of one of the MOTs and you get only half of the voltage
> (i.e. 5 kV).
>
> >By the way, how should I protect the diodes from voltage surges from the
> >primary circuit?
>
> Frankly, I don't know. I haven't been through a phase where diodes die, I add
> protection and they survive. They simply NEVER died since I put two of
them in
> series, with the RC parallel you see on my web pages. I have got also an LC
> filter (see http://www.saunalahti.fi/dncmrc/rffilter.html).
>
> Regards