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60KV Transformer.

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The_Happy_Duck

Fri Sept 09 2011, 04:51PM

Registered Member #4089 Joined: Fri Sept 09 2011, 04:40PM
Location:
Posts: 19

Hello,

I have just come from another forum because my question was un-answered. I am building a project at the moment whereby I need to create a spark which ranges from 5 to 10cm Long, (I presume that that is 50KV - 100KV). The problem is that this device has to be portable, from the use of batteries presumably. I was hoping that someone could assist me in finding a device that can do this, (I live in the UK, so no Tasers). I believe what I am looking for is a high voltage transformer; I have been looking around and cannot find one with a voltage high enough, I don't realy wan't to build one. If anyone knows another method or where to obtain one (from another member?) it would be much appreciated, thank you.

Forty

Fri Sept 09 2011, 05:25PM

Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649

you will almost certainly have to use a cw multiplier.

then you could use batteries to power a flyback driver

which drives an ac flyback transformer, which then drives the cw multiplier

Dr. Dark Current

Fri Sept 09 2011, 05:44PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Two automotive ignition coils in "anti-series" with the outputs properly insulated, can produce 10cm sparks.
A small inverter (think camera flash charger) can be used to charge a cap to few hundred Volts, then switch the charge to the coils primaries.

wolfman29

Fri Sept 09 2011, 07:48PM

Registered Member #4090 Joined: Fri Sept 09 2011, 04:43PM
Location:
Posts: 13

It's interesting - I am looking for nearly the exact same thing. Mind elaborating on what some of those terms are while I do my own research?

I was playing around with the transformer circuitry from a disposable camera (yes, I know, but I am not someone who just does those kinds of hacks), and I did some testing with my lab PSU and it managed to output up to 600V. Now, I have no idea what it's upper limit is - all I know is that my multimeter only goes up to 600V. Anyone know what the upper limits are on those things?

Dr. ISOTOP

Fri Sept 09 2011, 09:37PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

We need the application before we can help you.
60KV in short pulses or low current? No problem...a flyback + a couple stages of CW will do.
60KV at several tens of milliamps? Now that's some serious transformer-winding you have on your hands there.

The_Happy_Duck

Fri Sept 09 2011, 10:19PM

Registered Member #4089 Joined: Fri Sept 09 2011, 04:40PM
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Posts: 19

This is why I wish to buy one, I see that is not going to happen, I see I will have to start to get to terms with all of the techinal infomation.

Hotwired

Sat Sept 10 2011, 02:19PM

Registered Member #4049 Joined: Sun Aug 07 2011, 03:50AM
Location: UK
Posts: 14

wolfman29 wrote ...

It's interesting - I am looking for nearly the exact same thing. Mind elaborating on what some of those terms are while I do my own research?

I was playing around with the transformer circuitry from a disposable camera (yes, I know, but I am not someone who just does those kinds of hacks), and I did some testing with my lab PSU and it managed to output up to 600V. Now, I have no idea what it's upper limit is - all I know is that my multimeter only goes up to 600V. Anyone know what the upper limits are on those things?

The variety of board I tinker with goes up to between 600 and 700V, checked with a Fluke T5-1000 however the voltage does drop with a meter across it.

As for what you can do with it:

That's powered by a camera board. Charges a cap to 350V, that discharges through a small HV coil, HV coil produces up to a 3cm spark.

As you can probably tell, a 1.5cm square circuit isn't exactly high power, it pulls 3W doing that.

wolfman29

Sat Sept 10 2011, 07:26PM

Registered Member #4090 Joined: Fri Sept 09 2011, 04:43PM
Location:
Posts: 13

Yeah.

My application is continuous, low current, high voltage. Basically, I am looking to make a continuous, 10cm arc or so. Obviously, once I get the system up and running, I will stick a 1 or 10megohm resistor on the end just to make sure it's safe.

The_Happy_Duck

Sat Sept 10 2011, 07:57PM

Registered Member #4089 Joined: Fri Sept 09 2011, 04:40PM
Location:
Posts: 19

wolfman29 wrote ...

Yeah.

My application is continuous, low current, high voltage. Basically, I am looking to make a continuous, 10cm arc or so. Obviously, once I get the system up and running, I will stick a 1 or 10megohm resistor on the end just to make sure it's safe.

Well tell me how that goes, I might just have to replicate it, if im lucky.

wolfman29

Sat Sept 10 2011, 10:03PM

Registered Member #4090 Joined: Fri Sept 09 2011, 04:43PM
Location:
Posts: 13

Alright, can do!

The only problem right now is that I will probably end up using a DC flyback (they are a lot more common, as far as I know), so how will I go about driving a CW doubler? Need to convert the DC to AC but maintain the high voltage.... Unless, that is, I can get my hands on a high-voltage AC flyback.

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