[Amps] Buck Boost

[Robert Groh]

I think the usual idea is to increase the primary voltage by 10% - e.g.
by putting a small 12V (output) transformer in series with the 120VAC
line or putting a small 24 V (output) transformer in series with the
240 Vprimary. The small transformer only (!) needs a current rating
equal to the primary current on the big guy. For example, a 240 to 2400
V plate transformer with 1A secondary would have about 10A primary
current (actually need to add a bit to account for transformer
efficiency) so we would need a 24 VAC transformer with a 10A
capability. 

Using the primary means we don't muck up the center tap on the
secondary - if that is a concern. Also (possibly) lower voltages on the
'boost' transformer. Dynamic performance could be affected.  I've only
done this for low power units so can't speak to the impact on high
power units.

73
Bob, WA2CKY


----- Original Message ----
From: Patrick Egloff <pegloff at gmail.com>
To: Barrie Smith <barrie at centric.net>
Cc: Amps at contesting.com
Sent: Monday, April 28, 2008 11:39:53 AM
Subject: Re: [Amps] Buck Boost

Sorry for that, what might seem dumb, question. But what is this "boost
method" ??

An easy way to increase you HV by 10 % is to put a small transformer in
serial with you actual HV transformer secondary. If you have a 2000V
secondary, put a 150-200V in series. You must check if your new transformer
is highly enough insulated.
You can also make a 200V DC supply and put it in serial with your actual DC
supply.

I did that on one supply and it works perfectly. I did put it on the DC
grounded side, so insulation is not so critical.

73, Patrick


2008/4/28 Barrie Smith <barrie at centric.net>:

> I'd like to increase the output voltage about 10% on a HV plate
> transformer using the boost method.
>
> Does anyone know what penalties I may encounter using this proceedure?
>
> Since there's no free lunch, I'm thinking that the voltage regulation will
> be similar to what it would be when using a variac.  Is that true?
>
> The plate transformer I will be using is 1 amp, CCS.  If the boost
> transformer is stout, as well, I don't think the regulation will be to bad.
>
> Ideas?
>
> 73, Barrie, W7ALW
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-- 
Patrick Egloff - TK5EP
email : pegloff at gmail.com
Web page : http://tk5ep.free.fr
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