[ARC5] [Milsurplus] Homebrew choke

[hwhall at compuserve.com]

>requirement to float the secondary winding
 

 There is a doubler circuit that grounds the secondary's centertap, if that helps.

Wayne
WB4OGM

 

-----Original Message-----
From: Dennis Monticelli <dennis.monticelli at gmail.com>
To: Wayne Hall <hwhall at compuserve.com>
Cc: ARC-5 Maillist <arc5 at mailman.qth.net>; Milsurplus <milsurplus at mailman.qth.net>
Sent: Wed, Aug 17, 2016 1:16 am
Subject: Re: [Milsurplus] [ARC5] Homebrew choke



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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