[forgot to CC this back to the list]
Thanks, Jim.
I believe your comments about heavier bleeder current being a carry-over
are probably true.
I'm going to pencil in four 100k, 20-watt resistors with a working
voltage of something greater than 1KV. I don't know if that would bleed
4KV in 32uF off in 2 seconds or less, but it would get there. If I trip
over any energy storage equations in the next few days I may try to work
it out just for fun.
Thanks and 73,
Jim, N7CXI
On 2/28/2012 1:34 PM, Jim Hargrave wrote:
> Jim,
>
> The ARRL handbook has two recommendations.
>
> Bleeder resistance that will bleed the HV to 30 volts in 2 seconds after
> shutdown.
>
> Another place it recommends a bleeder resistance that will equate to approx
> 30% of the anticipated max load.
> The later seems to be a carry over from Tube rectifiers, where the bleeder
> assisted in parallel current regulation.
>
> My Clipperton-L has 800k which is distributed across the series filter
> capacitors. (HV is around 2800)
>
> That will give you a range that should fit most "Treasure Box" of parts.
>
> 73s de Jim
> W5IFP
>
>
>
> > -----Original Message-----
> > From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> > Behalf Of Jim Barber
> > Sent: Tuesday, February 28, 2012 2:43 PM
> > To: Amps@contesting.com
> > Subject: [Amps] Current thinking on HV supply bleeder current?
> >
> >
> >
> > I have a 3KV, 2A CCS transformer, and 32uf of filter. What's
> > the current
> > state of argument for appropriate bleeder current? The last time this
> > came up I seem to remember seeing everything from "HV safety bleed off
> > only" up to a rather high number.
> >
> > So... 100 ohms per DC volt? That would work out to a convenient 400K,
> > which could be four 100K in series, each with 1KV or so across them.
> >
> > Comments?
> >
> > Thanks,
> > Jim N7CXI
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
>
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