I try to keep the HV PS capacitance at about 25uF with a 50% safety margin.
All the amps I've built have used 3800VDC to 5000VDC at one to two amps. Oh!
in a couple supplies I used a choke input with about 12 uF. All seemed to
work nicely for me. I've never ran the lower voltage tubes, say around 2000
VDC, but I guess 35 uF would be more adequate for 1.5 plus amperes at 2000
VDC than 25 uF.
There has to be a chart somewhere out there on the www that shows ripple
percentage based on voltage, current and capacitance. Maybe it's in the ARRL
handbook somewhere. What would be better is an on-line calculator to take
the brain work out of it. If anyone has or finds this, let me know so I can
put it on my website.
Regards,
Larry
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of R.Measures
Sent: Monday, October 03, 2005 9:48 PM
To: Frank Goenninger DG1SBG
Cc: amps@contesting.com
Subject: Re: [Amps] Energy stored in capacitor bank ?
On Oct 3, 2005, at 7:54 AM, Frank Goenninger DG1SBG wrote:
> Hi all:
>
> I am finishing a power supply for a moderate amplifier (in terms of
> this reflector).
> As I am dealing with rather large caps I am wondering if am really
> right when
> calculating the stored energy in the bank:
>
> I have 14 caps in series, each having a capacity of 4200 uF. The load
> voltage for
> the bank will be about 3250 V DC (calculated using Duncan Amps' PSU
> Designer software).
>
> Am I right in simply calculation the stored energy as
>
> Cres = 4200 uF / 14 = 300 uF
>
> W = 1/2 * C * U * U = 0,5 * 300 *10^-6 * 3250 V * 3250 V = 1,6 *10^3
> J = 1,6 kJ
>
> ??
>
> This seems a rather large value ....
True, Frank, but 1600J is not that difficult to find a suitable glitch
R for. Globar's SP series is what you need.
Kanthal-Globar order desk - 716 286 7610
http://www.globar.com/
>
> 73, Frank DG1SBG
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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