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polop

Wed Feb 25 2009, 06:54PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
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Posts: 51

hi there i am looking for a high voltage generator that can produce more than 5kv at any noticable current, i was thinking modding disposable camera circuits or the very small ccfl drivers found in the gba light hood things(had one in the past great fun and compact but has since broken, and cant find a suplly of them recently) driven from 3.7v if posible, the use is to draw arks and look cool in its smallnes. any ideas i am stumped
thanks

ConKbot of Doom

Wed Feb 25 2009, 11:05PM

Registered Member #509 Joined: Sat Feb 10 2007, 07:02AM
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a camera inverter with a multiplier on the output should produce 5kv in a few stages, and still be compact, or you could use a diac to dump the 300v output into the trigger transformer.

mikeselectricstuff

Thu Feb 26 2009, 12:48AM

Registered Member #311 Joined: Sun Mar 12 2006, 08:28PM
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ccfl inverters only produce a few hundred volts - the high starting voltage happens due to the series resonance of the output caps and the secondary, but this is at negligible current & collapses under any load (e.g. when the tube strikes), However as the secondary can take a few kv they may be amenable to running a few stages of CW multiplier and cranking up the drive, although you may also need to up the frequency to avoid saturation

Proud Mary

Thu Feb 26 2009, 03:19AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

A tiny trigger auto-transformer made for xenon flash tubes will produce such a voltage, or you could excite a small inductance to develop the voltage across it. Depends how small "ultra small" must be!

ConKbot of Doom

Thu Feb 26 2009, 12:21PM

Registered Member #509 Joined: Sat Feb 10 2007, 07:02AM
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A Sidac like this

would be useful, use the camera circuit the way it is, just remove the big main capacitor, and replace the switch which fires the trigger transformer with the sidac. You might be able to leave the big main capacitor if the resistor which feeds the trigger cap is high enough to let the sidac shut off once it fires.

Ultra7

Thu Feb 26 2009, 07:48PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

?
Not 3 volts, but hey, it runs off of a 9V battery.
If you clip off the Ion spike Do-ma-flicky and strip off some insulation off the red lead, you can draw about an inch of arc to the negative terminal of the battery.

Here is a cool mod using it.

polop

Thu Feb 26 2009, 08:22PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
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Posts: 51

would this arangment work, with the output of the larger transformer put into the trigger transformer.

big5824

Thu Feb 26 2009, 08:35PM

Registered Member #1687 Joined: Tue Sept 09 2008, 08:47PM
Location: UK, Darlington
Posts: 240

piezoelectric transformer?

From wiki:

A piezoelectric transformer is a type of AC voltage multiplier. Unlike a conventional transformer, which uses magnetic coupling between input and output, the piezoelectric transformer uses acoustic coupling. An input voltage is applied across a short length of a bar of piezoceramic material such as PZT, creating an alternating stress in the bar by the inverse piezoelectric effect and causing the whole bar to vibrate. The vibration frequency is chosen to be the resonant frequency of the block, typically in the 100 kilohertz to 1 megahertz range. A higher output voltage is then generated across another section of the bar by the piezoelectric effect. Step-up ratios of more than 1000:1 have been demonstrated. An extra feature of this transformer is that, by operating it above its resonant frequency, it can be made to appear as an inductive load, which is useful in circuits that require a controlled soft start. [13] These devices can be used in DC-AC inverters to drive cold cathode fluorescent lamps. Piezo transformers are some of the most compact high voltage sources.

polop

Fri Feb 27 2009, 07:05PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
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Posts: 51

that piezoelectric transformer sounds good any more comments for me to understand the camera circuit, one more method would be to use two camera circuits, some how aranged that they produce a fulwave output. then feed that into a villard cascade. though i know that the circuits would need to be timed to outpput that, so any one can put a quicky schematic on how to use the transformers from the cameras driven by a simple circuit to generate the full wave output. thanks any help is apriciated and if this project is a succes iwill post a full write up!

Voltwad

Sat Feb 28 2009, 09:13PM

Registered Member #1829 Joined: Sun Nov 30 2008, 01:06AM
Location: Raleigh N.C.
Posts: 74

I posted a schematic of the fullwave flash inverter I used in a mini TC on this thread. Also, Are piezo transformers in use in any common application? They sound neat and if they're as available as flash inverters I'd love to play around with some. Hope this helps.

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