Re: choke input voltage doubler?

On Fri, 18 Nov 2005 23:06:03 -0500, John Popelish <jpopelish@xxxxxxxx>
wrote:

>Ken Scharf wrote:
>> I was looking at some power supply circuits for
>> tube linears and was thinking about the full wave
>> voltage doubler. This is basicly two half wave
>> rectifiers in series. Now I could build this
>> circuit with a choke input filter for each half
>> wave rectifier of the voltage doubler, and I could
>> put the chokes in the lead without the rectifier.
>> In this case I could use one choke for both halfs
>> of the voltage doubler. The output should then
>> be about .9 * rms input voltage * 2
>> or 1.8 times the rms voltage of the transformer.
>>
>> Has anybody ever tried this?
>>
>> ------>|--------
>> ) | |
>> ) | ---
>> ) | ---
>> )-----^^^^^^----|
>> | |
>> | ---
>> | ---
>> |--|<--------|
>>
>> Crude schematic showing transformer secondary
>> diodes filter choke and capacitors.
>
>If the choke is directly in series with the transformer, it will have
>to pass AC, and that won't provide normal choke input filtering (which
>steadies the DC current after the rectifier), but just puts an
>impedance between the transformer and the doubler.

All chokes are in series with the transformer and pass some AC
component. If they only passed DC we would need them.

Without giving this too much (likely enought) thought I think this
will fail because without loads across -each- filter cap, the critical
inductance will not be obtained.
>
>There may be a way to incorporate an inductor into a doubler, but I
>don't think this is it.

.

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