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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi guys, After I find out principle of modern Fly-back transformer I realized I could have very good use for my collection of these small monsters.
I’d like to start new project and I’d like to get some feedback before.
Here is the idea: I plan to connect secondary of 5 (or even more) fly-backs in series and make source of very high DC voltage. The primaries will be all triggered by single switch device (IGBT transistor) driven by TL494 oscillating at 20 KHz. I’m enclosing the scheme of the circuit. For single fly-back this simple circuit works very well
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Kizmo wrote ...
IMO it is possible to put 3 or 4 flyback xfmrs in series but you will face problems with secondary-core-primary insulation
I think my design is different from yours because I'm always using the internal primary. I also plan to dipp the whole string of fly-backs in oil bath. However, I still do not understand the insulation problems warning. Each fly-back in the string should face more or less the same voltage stress like when is operated alone. Or am I wrong?
IMO it is possible to put 3 or 4 flyback xfmrs in series but you will face problems with secondary-core-primary insulation
I think my design is different from yours because I'm always using the internal primary. I also plan to dipp the whole string of fly-backs in oil bath. However, I still do not understand the insulation problems warning. Each fly-back in the string should face more or less the same voltage stress like when is operated alone. Or am I wrong?
Think about potential differences.. every primary will be ~same potential but secondaries will float way higher than usually when another HV lead is grounded.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Bender wrote ...
[Think about potential differences.. every primary will be ~same potential but secondaries will float way higher than usually when another HV lead is grounded.
Shit, now I see it... Would it be a solution to run the whole driving circuit from a battery followed by inverter? (I have one 1500W computer back-up at home)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Mates wrote ...
Bender wrote ...
[Think about potential differences.. every primary will be ~same potential but secondaries will float way higher than usually when another HV lead is grounded.
Shit, now I see it... Would it be a solution to run the whole driving circuit from a battery followed by inverter? (I have one 1500W computer back-up at home)
If you can find 4 inverters that have several tens of kV allowed isolation voltage... I think you can't.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
jmartis wrote ...
If you can find 4 inverters that have several tens of kV allowed isolation voltage... I think you can't.
I think you do not understand the point. Running the whole stuff from a battery should avoid the attraction of the very HV of the upper secondaries to the primaries, because the primaries are not grounded. There should be no need for super-isolated inverter (and BTW: why four, one is enough to make AC from 24VDC and followed by transformer can easily drive the whole circuit).
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300KV from fly-backs?
