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Registered Member #1348
Joined: Sun Feb 24 2008, 01:48AM
Location: Michigan's Upper Peninsula
Posts: 22
here's something i've been pondering
when i think of pure DC voltage i think full wave. when it comes to CW multipliers, however, there seems to be little difference between series "half wave" and series "full wave" configurations. for example:
a half wave 5000 volt cockroft multiplier with 1% ripple fluctuates between 4950 and 5000 volts DC (at least that's the way i understand it). that's a pretty negligible fluctuation. it seems the only benefit to using a full wave multiplier, then, would be obtaining a yet even smaller ripple. EDIT: it is seen that both of these arrangements provide fairly smooth DC, one just slightly better than the other. for all practical purposes they both appear to exhibit DC similar in quality to a well-filtered fully rectified mains supply. are there any other advantages to using a full wave CW over a half wave CW?
wouldn't a VTTC supplied by either one of these multipliers behave more or less the same way (no different than if it were driven with a 60Hz mains transformer full wave rectified to 5000VDC)? --other than the fact that the multiplier's voltage will drop a bit under load.
are these assumptions correct? is there something i'm missing?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
A halfwave rectifier will only give you (sqrt2)/2 of the input voltage-it only uses one half of the AC sine wave coming in. A full wave rectifier will give you (srt2) times the input voltage. By 'halfwave voltage doubler' I thin kyou are reffereing to the 'level shifter' circuit used in microwaves, etc which will give you (srt2)*2 times the input voltage. Which one you use depends on how much voltage you need...
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half wave vs full wave cockroft-walton multiplier
