Re: [Amps] Filtering capacitor in a HV PS: How low can you get awaywith?

[R.Measures <r@somis.org>]

On Aug 16, 2004, at 11:12 PM, Angel Vilaseca wrote:

> "R. Measures" wrote:
> > On Aug 16, 2004, at 9:12 AM, Angel Vilaseca wrote:
> >
> > > Hi,
> > >
> > > I am building a 2500 V power supply for a one-KW transmitter. It will
> > > use 2 4CX20Bs.
> > >
> > > I have two oil-filled capacitors: 2.5 KV 40 uF  and a 4 KV 25 uF.
> > >
> > > I feel quite uncomfortable using the 40 uF 2.5 Kv one, because it 
> > > would
> > > work very close to its voltage limit.
> > >
> > > On the other hand, the 4 KV 25 uF would be OK as far as voltage is
> > > concerned, but would not 25 uF be too low?
> > >
> > > Is there a rule of thumb ?
> >
> > Angel -- Yes.  For a FWB, the filter C Å 50k / the R-load.   For a 
> > FWD,
> > each C Å 300k / R-load
> > cheerz
>
>
> So assuming amp resistance at max output is 3Kohms, we have 16 uF for a
> FWB and 100 uF for a FWD (?)
**  Yes, however, 2, 100uF capacitors in series are needed for FWD-  so 
the net C is 50uF.

> I am not sure what FWB and FWD mean.

**  FWB = full wave bridge rectifier, FWD = full wave (v)doubler.

> Is it inductance input filter and
> capacitor input filter?

**  C-only.
> Tnx fr your help

**  You are welcome, Angel.
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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