[Amps] OM power power supply design

[Larry Benko]

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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