Date: Sun, 12 Jun 2011 21:28:27 +0100
From: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Subject: Re: [Amps] Voltage Doubler Regulation
Richard Solomon wrote:
>I would like to look at ways to improve the Voltage Regulation in a
>Voltage Doubler Circuit.
>I tried Google, but didn't get much on the actual calculations involved.
>
>Since we have certain givens; such as The AC Line is what it is, the
>Plate Xfmr is what it is,
>the only variable in the equation would be the Capacitor value. Am I
>correct in that assumption ?
>
Many more variables need to be taken into account. Voltage regulation in
a doubler circuit will always be poorer than in a similar full-wave
bridge, and the series resistance of the transformer windings becomes a
critical factor.
## I have 3 x drake L4B's and mating hv supplies. 2650 vdc on RX..
and 2500 vdc with 800 ma key down cxr. They use a doubler. The
xfmr is a small thing. Sec dc resistance is 10 ohms. They used 8 x 200
uf caps. I replaced em with 8 x 2500 uf outboard caps.. [ and step start of
course].
Dynamic regulation is superb on ssb... it doesn't budge. Ripple dropped from
3%...down to just .24%
## The hb supplies all use dahl xfmr's and FWB... and also big caps in
series.
10,000 uf @ 450 vdc. They don't budge either. Zip for ripple on them.
## These boat anchor plate xfmr's will work with a high C filter too..and
provide
decent regulation.... but they run hot.
Later... Jim VE7RF
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