AC voltage doubler ?

Discussion in 'General Electronics Chat' started by Externet, Feb 1, 2009.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Is there any circuitry that can double (or triple) AC voltage using no transformer ?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    Such circuits would be highly frowned upon around here. Far too many "n00bs" may be tempted to experiment with it, and mains power is nothing for n00bs to play with.

    A transformer is required to safely isolate the circuit from the mains; even just a 1:1 isolation transformer will limit the current present.

    That being said, there are voltage doubler, tripler and quadroupler circuits on this page:
    http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/voldoub.html

    But don't try to power them straight from the mains.
     
  3. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Thanks, Sgt.
    No mains involved at all; I mean AC in ; AC out. 12AC to 24AC or 36AC.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    OK, those will do it for you - "sort of".

    A voltage doubler will reduce the available current by more than half, and it won't be quite double the voltage either (due to the Vf of the diodes used).

    A voltage tripler will reduce the available current by more than 2/3, and the Vf of the diodes will become more pronounced in the losses.

    A flyback topology inverter is a good alternative to using voltage doublers/triplers. Not as simple, but arguably more efficient.
    Ronald Dekker's "Flyback Converters for Dummies" is a great tutorial; well worth a few read-throughs:
    http://www.dos4ever.com/flyback/flyback.html
     
  5. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Those do use transformers, and do not output AC :(
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    My brain must be off completely today. :rolleyes:

    None of those voltage doubler/tripler/quadrupler circuits I mentioned will do it for you; the output will be DC.
     
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