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Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
I've been messing about with disposable camera transformers for a power supply for a tesla coil like this http://4hv.org/e107_plugins/forum/forum_viewtopic.php?36853.post, but they're burning out and not running properly when put in parallel or series, and handling no current at all. So I want to wind a step up transformer from about 9v to around 8-900v, I was thinking a 1-100 turn transformer, with a10 turn primary and a 1000 turn secondary powered by a battery like this http://uk.rs-online.com/web/p/products/2282018/ But I don't have a clue past that, should I use a ferrite or iron core (ferrite I think) and how should I drive it, I was thinking about a 555 timer based circuit, but I don't know how to do that or if it will provide the right frequency to go into the cw multiplier. Sorry about the wall of text! Any help is hugely appreciated.
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
I think ferrite would be a better choice, since it will probably be a high frequency driver that you make (such as the 555). Maybe increase the number of turns by 50%, so as to have less than 1V per turn, at least I think that's how it works :) Sorry I can't be of more use.
I've always wondered about using a 120:240 isolation transformer in reverse to create 480VAC, but I have no idea if the 240V insulation can take it, or if it will simply saturate the core? If rectified, it would be the perfect charger for my MKII cap bank :)
Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
OK thanks for the advice, I've ordered a couple of rm8 ferrite cores among other things. So I'll increase the turns a bit by the sound of things, any other advice? Anything is welcome I'm pretty unsure on what I'm doing.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I've always wondered about using a 120:240 isolation transformer in reverse to create 480VAC, but I have no idea if the 240V insulation can take it, or if it will simply saturate the core?
It will saturate the core and will set the windings alight in short order.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
FFwF: If you just want to charge capacitors, then you don't need a 100:1 turns ratio. The transformer in disposable flash unit (1.5-volt-to-300-volts) doesn't have a 200:1 ratio. In the flyback SMPS topology (named for original mass-market application), the primary voltage goes much higher than the DC input voltage.
But I think the flyback circuit output is not so good for feeding a CW voltage multiplier. Perhaps others here know better.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
kimbomba wrote ...
Klugesmith wrote ... The transformer in disposable flash unit (1.5-volt-to-300-volts) doesn't have a 200:1 ratio.
As far as I know the transformer in disposable flash unit has a 290:1 ratio (1750 secondary -- 6 primary).
Are you referring to the trigger transformer, or the cap-charging transformer?
I am, respectfully, skeptical. Don't see the need for such a high ratio in either application. Will take that as a challenge to go measure one. (Please nobody hold your breath waiting to see results). Do you have a particular flash unit type in mind, or an online reference? Thanks!
Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
Thanks for the tips! My ferrite cores arrived today (two x rm8) and they're bloody tiny, I should be able to get all the turns on though. I'm aiming for about 80-900v at 10-20 watts now, and I'm thinking about running it from an old laptop power supply. Any advice is still wanted, and I'll report back in a few days.
Klugesmith wrote ... The transformer in disposable flash unit (1.5-volt-to-300-volts) doesn't have a 200:1 ratio.
As far as I know the transformer in disposable flash unit has a 290:1 ratio (1750 secondary -- 6 primary).
Are you referring to the trigger transformer, or the cap-charging transformer?
I am, respectfully, skeptical. Don't see the need for such a high ratio in either application. Will take that as a challenge to go measure one. (Please nobody hold your breath waiting to see results). Do you have a particular flash unit type in mind, or an online reference? Thanks!
My reference is a couple of schematics that I have seen online, here is one of them:
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Winding a step up transformer
