Re: [TCML] GU5B VTTC rebuilt- new CW PSU

[Steve Ward <steve.ward@xxxxxxxxx>]

Hi Vasil,

It looks to me like you are not filtering the output very much (i see ~1.5uF
worth of microwave caps on each side of the doubler).  Im assuming these
capacitors are about fully discharged on each cycle, and maybe only serve to
ballast the HV supply at this point.  For real filtering you probably want
to series up a bunch of electrolytic capacitors to get the most energy per
cost.  Consider the energy storage for a CW SSTC of similar power level
might need 500-1000J of energy stored in the filter caps to get acceptable
filtering.  A typical microwave cap stores about 3J at 2500V, so you have
maybe 36J or so available, which cant offer much filtering for a CW device
of this power level.

Still, a nice plasma display.

Steve

On Mon, Oct 18, 2010 at 10:38 AM, Liviu Vasiliu <teslina@xxxxxxxxx> wrote:

> Hi
>
> The new source is ready.
> I was lucky enough to get these nice HV diodes (75 kV @ 100 mA):
>
> http://img143.imageshack.us/i/teslahvdiodes.jpg/
>
> The new PSU is a Greinacher cascade. The voltage from the 4 MOTs is
> doubled. The cascade capacitors and the filter caps reduce ripple. I used
> ferite beads as RF suppressors on the output HV cables:
>
> http://img243.imageshack.us/i/greincwgu.jpg/
>
>
>
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