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Voltage multiplier

Discussion in 'Electronic Basics' started by Roger Dewhurst, Sep 15, 2006.

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  1. Does a voltage multiplier always require AC or pulsed DC to run it? Are
    there any types that will multiply unpulsed DC?

    R
     
  2. Eeyore

    Eeyore Guest

    Only those that create their own 'pulses' !

    Graham
     
  3. Bob Eld

    Bob Eld Guest

    Yes there are voltage multipliers that will multiply pulsed DC. The first
    component of such a multiplier is a series capacitor. The output side of the
    first stage is a diode to ground and another diode forward. The voltage at
    this point is the peak-to-peak value of the original pulse train. In may be
    filtered to a DC value of the pk-to-pk.and the process repeated for higher
    voltages. Note: that the output of the series cap is an AC wave and that it
    is offset by the diode arrangement. BTW the same circuit works for an AC
    wave as well as pulsed DC because DC components do not go through the
    capacitors.
     
  4. I cannot conceive of any way to step a voltage up without some form of
    commutation. AC or pulsed DC are self commutating.
     
  5. Ban

    Ban Guest

    Those Electrons are lazy and won`t climb up to a higher potential by
    themselves, just like water. You have either to

    1.) kick them in the ass with an inductor
    or
    2.) lift them up with a switched capacitor (elevator) or a Van De Graaf
    generator (rolling staires)
    or
    3.) swing them up and down with a transformer and dump them on the top with
    a rectifier.
    or
    4.) convert their energy into something else (motion, light, heat) and then
    back at a higher level.

    For a beginner all these circuits are kind of complicated. You can buy
    DC/DC-converters ready made, but not cheap.
     
  6. Guest

    it does not depend on ac voltge,it can be operated on dc also
     
  7. JeffM

    JeffM Guest

    Yup. Like Ban said.
    This is the one that sprang to my mind.
    http://www.google.com/images?q=Cockroft-Walton+schematic

    It's kinda like Ban's 2a.
    http://www.google.com/images?q=Marx-generator+schematic

    Of course, the OP can buy black-box DC-DC converters that do this
    (they use Technique #1 internally--as well as Eeyore's bit).
     
  8. Jamie

    Jamie Guest

    you need some way of charging and discharging capacitors
    and gain voltage.
    i made an make up inverter (booster) for my FT100 radio
    since it is very picky about the littlest voltage drop..
    i used Hex FETS, 555 Timer that modulated to form a
    PWM circuit. the FETS are arranged in a logic state to
    charge and discharge the caps in a series, i guess you could
    call it a charge pump, a little different than what i have seen
    any where how ever...
    this unit uses large caps. and uses the original source along
    with the charged source to regulate voltage..
    there are no inductors at all in the circuit that play any roll
    in increasing the voltage..
    this thing works very good with very little noise generation.

    P.S.
    the Caps do get warm how ever, Low ESR is a must..
     
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