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Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
I have an idea to make the magnifier L1-L2 easier, but I would like to ask it first. Instead of helical L1 L2, probably a spiral L1 and L2 would be better in many cases (like a planar transformer), which can be done only in the magnifier conception. Coupling can be adjusted very easily, insulation between the 2 coils can be simply done by addig a lot of PE sheets for example. The outer end of the L2 should be the ground, and the inner end should be the HV output. Of course this means the center would be on a high potential, because of this, the L1 should be made with a bigger inner diameter. With this method someone can spare a lot of space, so the whole L1-L2 can be immersed in oil. Also I realised, the twin 3phase magnifier must be driven by a DC resosnant charging circuit, there is no other way, as either I would need a big resistor, or the drop of the transformers must be very high. So at this point it looks like this will be a 3 phase DC resonant λ/2 magnifier. This will be a nasty coil
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
There is nothing fundamentally wrong with the bipolar magnifier idea.
A DC resonant charging circuit needs a rotary spark gap to define the break rate.
Also, if you are running off 3 phase power you don't need a smoothing capacitor on the DC bus. The ripple is low enough even without one.
Without the smoothing capacitor you don't need a de-Qing diode either, the rectifier bridge functions as one. However it may work out cheaper to use one in practice. If you use the rectifier for de-Qing, the diodes see twice the reverse voltage than if you used a separate de-Qing diode.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
With the coils and their surroundings not being 100% identical, you'll get slightly different resonant frequencies and one coil could be performing better than the other one. Though I'm not sure if this will be a problem in practice.
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λ/2 magnifier
