Im curious as to what benefit will there be to raising the HV only 10%?
Its not going to raise the output enough to be heard on the other end but it
will add another 10% + strain on both windings.
Depending upon the transformer design you may not even be able to obtain
that 10% at full load.
Ive used a filament xfmr wired in Buck mode several times to reduce the HV
but not in Boost to raise it.
A boost is also an easy way to get a Tailtwister brake to pull back.
Carl
KM1H
----- Original Message -----
From: "Robert Groh" <rgroh@swbell.net>
To: "Patrick Egloff" <pegloff@gmail.com>; "Barrie Smith"
<barrie@centric.net>
Cc: <Amps@contesting.com>
Sent: Monday, April 28, 2008 1:47 PM
Subject: Re: [Amps] Buck Boost
>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@gmail.com>
> To: Barrie Smith <barrie@centric.net>
> Cc: Amps@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@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@gmail.com
> Web page : http://tk5ep.free.fr
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