Author Topic: ? on steping up voltage (Read 7835 times)

Dr.Greenthumb · « **on:** May 08, 2008, 03:38:01 AM »

What is required to step up voltage from a dc battery to 500+ volts? How does a stun gun produce a million volt charge just from a 9 volt battery?

Feynman · « **Reply #1 on:** May 08, 2008, 03:47:41 AM »

Producing High Voltage DC from Low Voltage DC

suppose input = 12VDC, output = 2000VDC

1) Run low voltage 12VDC into 'inverter' to produce approx 12VAC at 60-10,000hz. The frequency is up to you. An inverter is usually two transistors, two capacitors, and four resistors. It converts DC to AC.
2) Now you take the 12VAC and run it into a step-up transformer to get 480VAC. (assuming a winding ratio of 40:1)
3) Take your 480VAC and run it into a voltage quadrupler (basically some HV diodes and some caps) to get 1920VDC.
4) Now you have about ~2000VDC, so you can run it into some filters to make it nice and smooth (optional).

Dr.Greenthumb · « **Reply #2 on:** May 08, 2008, 03:54:32 AM »

will a dc-ac converter work? bought a 700 watt one from harbor freight. it puts out 115VAC. When you say a step-up transformer, could the same step up transformer also be used as a step down transformer if hook up the other way around?

Feynman · « **Reply #3 on:** May 08, 2008, 03:59:40 AM »

Oh yeah, that'll work perfect. Just be really careful cause 700watts is a powerful inverter.

So take that 115VAC and run it into a high voltage transformer. High voltage AC will come out the other side of the transformer. You can either multiply this higher, or else you can convert it directly to DC.

To multiply higher...
Use a voltage doubler, tripler, or quadrupler.

To go direct to DC...
Use a bridge rectifier to convert the AC back to DC.

Dr.Greenthumb · « **Reply #4 on:** May 08, 2008, 04:10:39 AM »

Awesome thanks for your fast reply. I will have more question as time goes on about electronic components.The class I took at my local college was only for automotive electronics. But it did lead me here! I cant get enough of it all now.

Feynman · « **Reply #5 on:** May 08, 2008, 04:19:52 AM »

HAha, fantastic. Are you gonna convert your car to run on HHO?

High voltage transformers:
http://www.surplussales.com/transformers/HvLvTr-2.html

Voltage Multipliers (these take AC input, output is DC)

Voltage Doubler
(http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/ietron2/voldoub.gif)

Voltage Tripler
(http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/ietron2/voltrip.gif)

Voltage Quadrupler
(http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/ietron2/volquad.gif)

source: http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/voldoub.html

Capacitor values are approximate, 10uF is probably about right. Just make sure the caps are rated for high voltage.

pese · « **Reply #6 on:** May 08, 2008, 09:58:17 AM »

Jes like fynman hve shown it.
use an diode/condensor cascate.
(each step the input voltage will ADDED now to the votage from
last stage before (less the voltag drop in diode (usually 0,7 Si Diode or 0m4 shottky diode)
for input you must not have transformer.
use anlitte stare-cas oszillator. to drive an small audio-amplifier.
(TDA2002 or others) also from scraped car radio or small home-ampli
PC speakers enz.

The vauel from condensors can be small if used over 1000 Hertz for frequencies.
If using in 100 Hz area you will using in mircro-farad range, (and so giber the
needed currents (power) so bigger the condensors.

air inonizers using this princip to make from 110 / 22o volt line voltalte 25kW

same you can use at 12 volt by using 10 time more cascades (as at 110v)

the use of stare-case waves , with higer frequencis , will allow, smaller condensors
wit good efficenties.

Pese

If

billmehess · « **Reply #7 on:** May 08, 2008, 04:46:44 PM »

Starting with 4vdc and stepping up the voltage to kv range (with extemely low current) possibly from a van de graff generator what would be the effect of using this to electrolysis water to produce hydrogen?
Or the kv produced by a stun gun.

Dr.Greenthumb · « **Reply #8 on:** May 09, 2008, 06:57:33 PM »

How about using vehicles ignition coils? I have more then several laying around not being used from an old rx-7.
Also to be sure this is a transformer correct?I took it off of the old heater we had before we replaced it with a high efficiency one(http://i4.photobucket.com/albums/y150/danfrommi/electricity/IMG_0436.jpg)
And this one thats from a stun gun. (http://i4.photobucket.com/albums/y150/danfrommi/electricity/IMG_0437.jpg)

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