Re: Potting Diode Strings

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Huffman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <huffman-at-fnal.gov>

You will also get twice the voltage output with a bridge over the center
tapped arrangement.
Dave
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, March 25, 2002 18:32
Subject: Re: Potting Diode Strings


> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>
> Hi Alex,
>
> On 25 Mar 2002, at 7:46, Tesla list wrote:
>
> > Original poster: "Alexander Rice by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <alex-at-rices.myip-dot-org>
> >
> > Hi All,
> > This whole discussion on potting a few
> > diodes seems a little long, but FWIW here are
> > my comments - firstly, if you were to use a
> > full wave rectifier the greatest PIV seen by
> > the diodes would be about 20v at the most
> > (number of diodes * foward voltage drop)
> > which kills the risk of flashover, for the
> > time and money and effort you may as well go
> > for full wave and get more power in the
> > process. As for holding them neatly, i would
> > suggest attatching them to a piece of
> > acryllic, either with hot glue (easy way) or
> > by putting four bolts though the plastic and
> > gluing them in, then attach the ends of the
> > four strings to the bolts.
> >
> > as a sideline i just remebered that with a
> > center tapped transformer you can full wabe
> > rectify it with just two (strings of) diodes,
> >
> >
> > AC_1---------->|---|
> >                    |
> >                    |
> > CT-------LOAD------|
> >                    |
> >                    |
> > AC_2---------->|---|
> >
> >
> > Whilst i am sure all the EE's on the list
> > knew about this it is not an obvious config.
> >
> > regards
> >
> > alex
>
> The main problem with that configuration is that you aren't making
> best use of the copper in the windings. Only one half of the
> secondary is delivering power at any one time. A bridge would be the
> way to go in my book. You still only need the same number of diodes
> and they would be distributed in four strings rather than two.
>
> Regards,
> Malcolm
>
>
>
>
>