Larry.
I looked at the drawings and couldnt quit make my mind up as to what was going
on. your explanation cleared it up for me.
Dave kg4uxr
----- Forwarded Message ----
From: Larry Benko <xxw0qe@comcast.net>
To: Amps@contesting.com
Sent: Wed, December 9, 2009 6:05:20 PM
Subject: Re: [Amps] OM power power supply design
Alek,
Two power supplies, each with their own diodes and capacitors do NOT
change anything regarding voltage breakdown in the 2 transformers when
the outputs ar put in series. Think of the circuit like this: During
part of the AC cycle certain diodes will be conducting. Redraw the
circuit with the conducting diodes as shorts and the non-conducting
diodes as opens and then look at the circuit. Unfortunately the high
side transformer is still stressed more than the low side one. It would
be nice if this wasn't the case but then again there usually is no such
thing as a "free lunch". :)
73,
Larry, W0QE
Alek Petkovic wrote:
> It doesn't look to me, like the secondaries are in series.
>
> Each secondary has it's own rectifier and the dc outputs are in
> series. Is there some sort of path back through the full wave bridge
> rectifiers which ties the secondaries together?
>
> Cheers,
> Alek
> VK6APK
>
> At 05:04 AM 10/12/2009, Bill, W6WRT wrote:
>
>
>> Whenever you put transformer secondaries in series you must be careful not to
>> exceed the insulation rating between a secondary and the iron core, and also
>> between a secondary and the AC primary.
>>
>>
>
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6py
>
>
> _______________________________________________
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> http://lists.contesting.com/mailman/listinfo/amps
>
>
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