Voltage multiplier

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

Reply to
Roger Dewhurst
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Only those that create their own 'pulses' !


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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.

Reply to
Bob Eld

I cannot conceive of any way to step a voltage up without some form of commutation. AC or pulsed DC are self commutating.

Reply to
Homer J Simpson

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.

ciao Ban
Apricale, Italy
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it does not depend on ac voltge,it can be operated on dc also

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Ban wrote:

Yup. Like Ban said. This is the one that sprang to my mind.

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It's kinda like Ban's 2a.

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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).

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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..

Real Programmers Do things like this.
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