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Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I finally found a ferrite core available locally. And i recently bought a 2 KG spool of 34 AWG wire so i am going to use it. Here is the core i found. Quite the beast i think? I will buy two. And arrange the two I onto one U as to make a large U and a small U. I should have about 25 centimeters of winding length. I will wind 23 Cm of them. Which gives about 1440 turns. Single layer :) I will wind it on a PVC pipe just like a tesla coil. The primary will be 3+3 turns. Hooked up to my IGBT ZVS driver fed straight by the mains. I get about 320VDC out of the rectifier and filter.. Meaning i should have 76800 volts at the secondary. (Not taking into account resonant rise , The fact that i might include a series resonant capacitor on the secondary and all the other stuff) It will be submerged in oil Ofcourse :P. I am thinking about epoxy coating the secondary. Ideas? Thoughts? Ideas? Mmm?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Since you have over 6 miles of wire I guess you'll have some spare, I'd use several 34awg strands in parallel (like 'Litz' wire) for the primary, number of parallel strands in primary = Ns/Np
I doubt that you will be able to insulate 76.8 kV at 10's kHz, Could you use two secondaries arranged as 38-0-38 kV? (even this will be difficult to reliably insulate)
Could you use an even lower voltage secondary with a voltage multiplier?
I would decide what uses I may have for such a finished transformer, e.g.
C-W multiplier (choose voltage to match available diodes and caps)
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
It will be a single layer. Under oil , epoxy coated. And i will design it to be a Bench power supply , Yes. Reliability is important. That's why i picked the ZVS driver. As it barely heats even when switching 1000 watts+ And i never blew a mosfet or igbt with it
And i need AC. If i ever need DC i would probably use a string of 100 UF4007
I want to do all the experiments that one can do with an X-Ray transformer. But since over here. Even the dental X-Ray used head costs more than the entire cost of the transformer. So i though a DIY approach would be more appropriate.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
StormInABottle wrote ...
It will be a single layer. Under oil , epoxy coated. And i will design it to be a Bench power supply , Yes. Reliability is important. That's why i picked the ZVS driver. As it barely heats even when switching 1000 watts+ And i never blew a mosfet or igbt with it
And i need AC. If i ever need DC i would probably use a string of 100 UF4007
I want to do all the experiments that one can do with an X-Ray transformer. But since over here. Even the dental X-Ray used head costs more than the entire cost of the transformer. So i though a DIY approach would be more appropriate.
A Well made IGBT Fullbridge is a lot more reliable then a ZVS driver as far as i know.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Thomas W wrote ...
StormInABottle wrote ...
It will be a single layer. Under oil , epoxy coated. And i will design it to be a Bench power supply , Yes. Reliability is important. That's why i picked the ZVS driver. As it barely heats even when switching 1000 watts+ And i never blew a mosfet or igbt with it
And i need AC. If i ever need DC i would probably use a string of 100 UF4007
I want to do all the experiments that one can do with an X-Ray transformer. But since over here. Even the dental X-Ray used head costs more than the entire cost of the transformer. So i though a DIY approach would be more appropriate.
A Well made IGBT Fullbridge is a lot more reliable then a ZVS driver as far as i know.
Well. A SSTC's fullbridge blew lots of mosfets. My ZVS NEVER blew a single mosfet or IGBT
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Have you actually run a 'zvs' from 320 Vdc? I've had problems doing so.
You need to think about the gate drive circuitry due to the high dv/dt at the collector turning on the transistor that should be off via the collector-gate capacitance. (I think that's the problem) A separate gate drive circuit may be required, not the usual resistor & zener.
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High voltage transformer?
