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High voltage DC voltage doubler? Answered

Is there any kind of high voltage voltage doubler that uses pulsed DC?
(Solid state not anything like a Marx)

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The MadScientist
The MadScientist

Answer 9 years ago

So that one definitely takes pulsed DC? If so will you need to attach it a certain way and which pins are which I don't quite understand what it's saying?

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steveastrouk
steveastrouk

Answer 9 years ago

Well, pulsed DC is AC !!

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steveastrouk
steveastrouk

Answer 9 years ago

Sorry, its not often I pull rank, but as a professional electronic engineer for 30 years, I'm telling you it is, with an apparent change of origin.

Steve

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The MadScientist
The MadScientist

Answer 9 years ago

Do the electrons move at the same speed?

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steveastrouk
steveastrouk

Answer 9 years ago

Of course.

Out of interest, how fast do you think they're moving ?

Steve

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steveastrouk
steveastrouk

Answer 9 years ago

Nope. Walking speed.

Steve

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The MadScientist
The MadScientist

Answer 9 years ago

Doesn't AC move a lot faster than DC?

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steveastrouk
steveastrouk

Answer 9 years ago

The current does, but the charge carriers don't.

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kelseymh
kelseymh

Answer 9 years ago

As Steve said, "Wrong." Current travels due to collective motion of all the electrons in a material, not due to the direct travel of any given electron from source to drain. The electrons travel at drift velociy (look that up on Wikipedia), while the current propagates at some large fraction of c.

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gmoon
gmoon

Answer 9 years ago

I think you're both right, Steve. I have seen older definitions that indicate it needs to alternate voltage through positive to negative ranges to be called "AC."

But a more modern defintion (and Wiki) doesn't require that to "alternate".

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steveastrouk
steveastrouk

Answer 9 years ago

Its a relative thing, and thats where I am coming from. Where is your reference ? It can be anywhere, and a Fourier analysis shows harmonics, therefore its AC.

Mathematically, there isn't anything that is "DC" because it had to be switched on at some time.

Steve

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gmoon
gmoon

Answer 9 years ago

Yeah, true in the strictest "academic debate" sense.

(Sometimes it's OK to use the same definitions that your local utility, electrician and UL use...)

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steveastrouk
steveastrouk

Answer 9 years ago

Well, no, because as has already been pointed out, the doubler WILL work with what has already been called "pulsed" DC

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gmoon
gmoon

Answer 9 years ago

Not to be argumentative, but why does denying that DC is a valid concept have anything to do with the use of "pulsed" DC?

This is all just noise to the OP.

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gmoon
gmoon

Answer 9 years ago

The difference between AC and pulsed DC is that a portion of AC has negative voltage in respect to ground (and that pulsed DC might not be a smooth sine wave).

It's not really important here, AND you'd probably want all the output to be positive anyway.

Go back to Lemonie's link. Click on the second pic (schematic)--it explicitly says pulsed DC is fine.

There's an input and an output. They share a common ground. That's all there is too it.

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ctscasemod
ctscasemod

8 years ago

Gmoon is right. AC is an alternating current, it does switch polarity, lets not over complicate. To be AC you have to go up and down 0, alternates.

DC is DC. At the ouptut of a bridge rectifier you have Pulsed DC, from 0 to the peak of the sine wave.

The fact you have noise on a pulsing DC current doesnt make it an AC. If you try to spin an induction motor with pulsed DC it will lock and vibrate, at least!