[ARC5] Homebrew choke

[Dennis Monticelli]

The doubler we are talking about is indeed a full wave circuit in all
respects.  One potential disadvantage of the configuration is the
requirement to float the secondary winding.  This makes it more challenging
to derive other voltages from the same winding.  Another minor disadvantage
is has to do with when the series caps become unequal in capacitance.  This
introduces a 60Hz component to the ripple waveform.

There is another doubler configuration that is more properly termed a
charge pump.  This circuit is usually used in low power applications.  You
won't find it in transmitter power supplies.

Dennis AE6C

On Tue, Aug 16, 2016 at 11:39 PM, <hwhall at compuserve.com> wrote:

> >
> The charging is half-wave to each capacitor, with the other capacitor
> having to supply the full load on that part of the cycle.
> >
>
> Each cap is indeed pulsed at a halfwave rate, so together the pair (being
> in series) is being pumped twice for every cycle & that is what the load
> "sees" as being fullwave.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: AKLDGUY . <neilb0627 at gmail.com>
> To: hwhall <hwhall at compuserve.com>; ARC-5 List <arc5 at mailman.qth.net>;
> milsurplus <milsurplus at mailman.qth.net>
> Sent: Tue, Aug 16, 2016 11:58 pm
> Subject: Re: [ARC5] Homebrew choke
>
> OK, but I think that Handbook information simply illustrates that the
> waveforms are identical, being full-wave rectification, and takes no
> account of the loading on the supply. That is, it shows no-load or low-load
> conditions.
>
> I have never understood why the voltage doubler circuit is called a
> full-wave circuit. The charging is half-wave to each capacitor, with the
> other capacitor having to supply the full load on that part of the cycle.
> Sure, the rectification is full wave, but so far as the output is
> concerned, it's the same as a half wave circuit. It really should be called
> a double-half-wave circuit.
>
> 73 de Neil ZL1ANM
>
>
> On Wed, Aug 17, 2016 at 5:01 PM, <hwhall at compuserve.com> wrote:
>
>> >
>> But because each capacitor in such a circuit is charged only on
>> alternate half-cycles, with the other supplying the full load, the
>> regulation, and hum, is going to be a lot poorer than it is in
>> the full-wave bridge circuit
>> >
>>
>> According to my ARRL Handbooks, the output waveform from a voltage
>> doubler looks the same as the output waveform from bridge or center-tapped
>> fullwave rectifiers.
>>
>> Wayne
>> WB4OGM
>>
>>
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