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Registered Member #3638
Joined: Fri Jan 21 2011, 11:56PM
Location:
Posts: 10
wow, thanks hboy007 :D btw, what program you used to draw it? and.. whats the output? ... 6077-1, will it only enable/disable output to the jack? (-vcc) whats the specs of the transfomer and R14? thanks.
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
I posted the circuit do give you an explicit idea of the topology that may suit your requirements. You may re-arrange the components as needed. The transformer is salvaged from an ATX psu. They usually look like this:
there is a single chamber bobbin, tightly wound with the secondary, each copper layer is separated by several sheets of insulation. The secondary winding consists of 6-8 strands of medium diameter (0.3-0.8mm) copper wire emerging as a pigtail on top of the bobbin. The wires are split in two groups, each of which is wound down in clockwise and counter-clockwise direction respectively.
The coupling of the windings is very good, the ferrite E- core is air gapped (1-1.5mm). Consider reading Pressman (ISBN 978-0070522367) to get further instructions on magnetics design if you choose to build the transformer yourself. The secondary winding is usually designed to withstand ~200V. Some people I know that have also tried to get more voltage out of ATX psu transformers have burnt them but they work fine for me in a voltage doubler setup generating +/-300V. That is why I suggested that you use two transformers with their secondaries in series with two separate oscillators in sync.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Anders M. wrote ...
Most capacitor charging circuit are constant current or constant power anyways, so they can't be modelled as an RC circuit. I don't think it makes sense to talk about apparent output resistance if you're charging a capacitor with a switchmode supply, just how much power it can deliver to the cap at any point.
Yes, I realize a SMPS or voltage mutiplier cant be modeled as a RC circuit, I was merely advising him that what ever system he uses cant have R that approaches 166 ohms, or it will be too slow for his desired shot rate of one charge per second for his gun.
And yes, the power out is the more useful number for charging time, I tried to do that too, (bothced that math the first time) to give leo an idea of what V and I would be needed, I feared he didnt realise how much power the PS would have to output.
I was trying to guide him along, in realising the design requirements, before he bought built stuff.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
I second the suggestion to try a Mazzilli driver. It's ridiculously simple, I built my first one by just tacking together the parts in free air to see if it would work. It's not regulated, but it's very efficient, simple, robust, and you can get practically whatever you want on the output by winding the appropriate number of secondary turns.
I've tried and it works just fine with plain ungapped ferrite cores, it doesn't have to be a flyback transformer.
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Portable transformer help! 11v to 800v
