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Re: [TCML] Crock Croft Walton Voltage Multiplier
Thanks for all the great ideas on construction, anyone
have any Ideas for resistors of that size (could you build
one)?
On Thu, May 3, 2012 at 10:23 AM, Kurt Schraner <k.schraner@xxxxxxxxxxx>wrote:
> Hi,
>
> of course Cockrroft and Walton are the famous Nobel winners for using this
> device:
>
> http://en.wikipedia.org/wiki/**Cockcroft%E2%80%93Walton_**generator<http://en.wikipedia.org/wiki/Cockcroft%E2%80%93Walton_generator>
>
> but why should it not be mentiond, that it was invented long time before
> by :
>
> http://en.wikipedia.org/wiki/**Heinrich_Greinacher<http://en.wikipedia.org/wiki/Heinrich_Greinacher> ... the Greinacher cascade
>
> ...just a Q, this is no AC vs. DC war! ;-) ... and I'm not too much of a
> patriot.
> Bert: I enjoy happily your explanations to the device: super!
>
> Regards, Kurt
>
>
> -----Ursprüngliche Nachricht----- From: Bert Hickman
> Sent: Thursday, May 03, 2012 5:39 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Crock Croft Walton Voltage Multiplier
>
>
> Just about any HV capacitors will work, including Power Factor
> Correction (PFC) caps. However, PFC caps contain internal bleeder
> resistors that will reduce the overall output of your CW multiplier.
>
> The rated DC voltage of the stage capacitors must be at least as high as
> the peak HV input voltage, and the HV rectifiers must be at least 2X the
> peak HV input voltage. Add 20% - 50% to this to provide a degree of
> design margin. Use fast recovery rectifiers if you'll be driving from a
> high frequency source (see below). You can stack a series of identical
> lower voltage rectifiers to create higher voltage rectifiers.
>
> Although a CW multiplier can be used for "hair raising" experiments,
> this is really NOT recommended unless you know EXACTLY what you are
> doing... especially if you're storing significant energy in your CW
> stage capacitors. This trick is done by connecting a series chain of
> high voltage resistors (Gigaohm(s)) between the CW output and your
> volunteer to severely limit maximum current to no more than 10's of
> microamperes. If your volunteer suddenly decides to step off the
> insulated platform, or if the platform flashes over, the HV resistor
> chain MUST safely withstand the full voltage of your CW without breaking
> down. Your volunteer's life may very well depend on YOUR engineering and
> construction skills.
>
> Give serious consideration to the total amount of energy stored within
> the stage capacitors before arbitrarily selecting large valued stage
> capacitors. Consider powering your CW from a high frequency (20 - 25
> kHz) HV source. This will allow you to reduce the stage capacitance and
> total CW energy. Also, remember that short-circuiting the HV output will
> likely destroy some (or all) of your rectifiers.
>
> Some good design information for half-wave and full-wave CW designs can
> be found here:
>
> http://blazelabs.com/e-exp15.**asp <http://blazelabs.com/e-exp15.asp>
> http://home.earthlink.net/~**jimlux/hv/cw1.htm<http://home.earthlink.net/~jimlux/hv/cw1.htm>
>
> Good luck and play safely,
>
> Bert
> --
> Bert Hickman
> Stoneridge Engineering
> http://www.capturedlightning.**com <http://www.capturedlightning.com>
> ****************************************************************
> ***********
> World's source for "Captured Lightning" Lichtenberg Figure sculptures,
> magnetically "shrunken" coins, and scarce/out of print technical books
> ****************************************************************
> ***********
>
> Neon Tesla wrote:
>
>> Im not sure if this is of topic but;
>> I wan't to build a voltage multiplier but I have seen very little on the
>> practical construction of large units, my 3 main questions of construction
>> are, firstly what type of capacitors would work, would high voltage
>> distribution PFC's be suitable? Secondly what are the values that should
>> be used for the Capacitors and Diodes in relation to the power source,
>> should the parts be over rated? And last I've seen Crock Croft Walton
>> multipliers used in the same way as a Van De Graff in hair raising stunts,
>> should or could this safely be attempted?
>>
>
>
>
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--
*Don't lower your expectations, raise the voltage !*
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