[Amps] Amps Digest, Vol 151, Issue 3

[John Hurst]

The main issue is the excitation current of the transformer. If the
transformer was designed (with enough turns and core cross section) for 50
Hz and your running on 60 Hz then you have an automatic 20%  (60/50) safety
margin for an increase on the primary voltage w/o worrying about core
saturation.

John KU6X

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Sent: Saturday, July 04, 2015 9:00 AM
To: amps at contesting.com
Subject: Amps Digest, Vol 151, Issue 3

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Today's Topics:

   1. boost transformer (Wayne Newport)
   2. boost transformer (Wayne Newport)
   3. Re: boost transformer (John Bodine)
   4. Re: boost transformer (Vic Rosenthal 4X6GP/K2VCO)


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Message: 1
Date: Sat, 4 Jul 2015 07:21:35 +1000
From: "Wayne Newport" <wazzan1 at bigpond.com>
To: <amps at contesting.com>
Subject: [Amps] boost transformer
Message-ID: <666CEB12369E4031B07BB3EF30733B0A at Wayne>
Content-Type: text/plain;	charset="iso-8859-1"

hi all, I just wanted an opinion I have a  DC power supply but I need 3400V
for a project.I was looking at using a boost transformer. Antek have a
toroid @ 34V 8 amps. Can the 34V secondary be put in series with the 240V
primary of my main transformer to boost the secondary HV. I calculate that
when rectified and filtered the 34V should get me about 420V extra DC
voltage. Are there any pitfalls to using this boost transformer method
regards Wayne VK4WTN

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Message: 2
Date: Sat, 4 Jul 2015 07:46:44 +1000
From: "Wayne Newport" <wazzan1 at bigpond.com>
To: <amps at contesting.com>
Subject: [Amps] boost transformer
Message-ID: <86DEB87F62F2475F9F203BC51F4F465E at Wayne>
Content-Type: text/plain;	charset="iso-8859-1"

Thanks for the reply Colin. Yes the main transformer is a 240V primary so as
you said maybe some problems with the extra 34V.My project is a GS35b amp so
I will try it on the 3000V HV first which I guess will be about 2800V under
load and see how it goes. Im not so worried about gettinh maximum power out
as we cant use it over here.
OK on making a second 400V supply and putting it in series with the existing
3000V supply that may be the safest way of doing it.
regards Wayne VK4WTN


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Message: 3
Date: Fri, 3 Jul 2015 18:05:49 -0400
From: John Bodine <WU2E at arrl.net>
To: Wayne Newport <wazzan1 at bigpond.com>
Cc: amps at contesting.com
Subject: Re: [Amps] boost transformer
Message-ID:
	<CAFJ4jdZ0VfN-yTDhWHC3YipL5-iNi9yRFZ4WpsvmbVdtJuE0Vw at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Death wish, no offense.

On Fri, Jul 3, 2015 at 5:21 PM, Wayne Newport <wazzan1 at bigpond.com> wrote:

> hi all, I just wanted an opinion I have a  DC power supply but I need
> 3400V for a project.I was looking at using a boost transformer. Antek have
> a toroid @ 34V 8 amps. Can the 34V secondary be put in series with the
240V
> primary of my main transformer to boost the secondary HV. I calculate that
> when rectified and filtered the 34V should get me about 420V extra DC
> voltage. Are there any pitfalls to using this boost transformer method
> regards Wayne VK4WTN
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>


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Message: 4
Date: Sat, 04 Jul 2015 09:31:42 +0300
From: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic at gmail.com>
To: amps at contesting.com
Subject: Re: [Amps] boost transformer
Message-ID: <55977DCE.7010207 at gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

It's kind of a stretch. I have done this, but never increased the line 
voltage more than 10% (on the grounds that most components have at least 
a 10% safety factor built in). But keep in mind that your line voltage 
may vary quite a lot, and if you start out with a high line voltage one 
day, you may get more than you've bargained for.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 4 Jul 2015 00:21, Wayne Newport wrote:
> hi all, I just wanted an opinion I have a  DC power supply but I need
> 3400V for a project.I was looking at using a boost transformer. Antek
> have a toroid @ 34V 8 amps. Can the 34V secondary be put in series
> with the 240V primary of my main transformer to boost the secondary
> HV. I calculate that when rectified and filtered the 34V should get
> me about 420V extra DC voltage. Are there any pitfalls to using this
> boost transformer method regards Wayne VK4WTN




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End of Amps Digest, Vol 151, Issue 3
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