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1. [Amps] Choke-input with voltage doubler? (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Thu, 09 Feb 2006 17:07:13 +0000; My friend obtained a 1000-VCT brute of a transformer, weighs 25 lb. Old Chicago Transformer, potted, looks mil-surplus. I assume it was made for a choke-input filter. He wants to use the full seconda; /archives//html/Amps/2006-02/msg00207.html (7,090 bytes)
2. Re: [Amps] Choke-input with voltage doubler? (score: 1): Author: John Popelish <jpopelish@rica.net>; Date: Thu, 09 Feb 2006 13:18:59 -0500; If you derate the transformer for output current, the chokes are not necessary. You can also lower the peak factor on the windings by adding a small inductance in series with the primary to spread ou; /archives//html/Amps/2006-02/msg00209.html (7,540 bytes)
3. Re: [Amps] Choke-input with voltage doubler? (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Thu, 09 Feb 2006 18:54:48 +0000; What about using a small series-R from each half of the doubler? I think regulation is less of a factor here because most of the current will be continuous. 73, Jim, KR1S http://kr1s.kearman.com/ __; /archives//html/Amps/2006-02/msg00210.html (7,316 bytes)
4. Re: [Amps] Choke-input with voltage doubler? (score: 1): Author: Larry Keith <kq4by@rocketmail.com>; Date: Thu, 9 Feb 2006 11:06:56 -0800 (PST); So, I should de-rate by 10% or so? You can also lower the peak factor on Small as in the inductance of filament transformer in series with the primary? Tnx for the help! 73, Larry KQ4BY Larry Keith; /archives//html/Amps/2006-02/msg00211.html (8,202 bytes)
5. Re: [Amps] Choke-input with voltage doubler? (score: 1): Author: John Popelish <jpopelish@rica.net>; Date: Thu, 09 Feb 2006 18:35:36 -0500; That is one way to lower the peak current. But you get a slightly cooler transformer if you create the same heat in a resistor in series with the primary. During the peak currents, the transformer pr; /archives//html/Amps/2006-02/msg00212.html (7,892 bytes)
6. Re: [Amps] Choke-input with voltage doubler? (score: 1): Author: John Popelish <jpopelish@rica.net>; Date: Thu, 09 Feb 2006 18:47:23 -0500; Too many unknowns to say exactly what derating factor is required. The goal is to keep the winding temperature in spec. Way too much. Something more like a millihenry or so, like what is used in big; /archives//html/Amps/2006-02/msg00213.html (8,709 bytes)

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