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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
eniyuki -
The only challenge will probably be the charging inductor. The de-Q'ing diode can simply be a string of (25) 1kV, 3A or 5A diodes.
Occasionally, 10-20H HV charging inductors show up on eBay, but not very frequently. Pictures are attached of a few I've found.
Steve C used (4X) conventional 7.5H DC filter chokes connected in series. These are probably not rated for anything near the applied voltage, but they seem to have survived.
Or, you can build your own inductor, either air-core or iron core. Here is a link to an inductance calculator for designing multi-layer air-core inductors:
Four or five reasonably sized inductor "disks" could be wound and series connected to get 20-25 Henries. Kurt Schraner's techniques for winding the disk inductors for his induction coils could be used, with insulation between each layer of wire.
Registered Member #2148
Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
steve thanks steve for a nice dctc coil there. this will provide sufficient info for me. Well, im not after to that calculator 100%, who knows maybe Richie includes some impt. calculations to his calculator.
I input all the formulas provided by richie in MS excel to make life easier!
Herrzapp, thanks for the links. i might use strings of 1n4007s up to a suitable voltage rating.
As for my charging reactor(main problem), no budget ATM. i might build one but im a bit worried because 5-15 H is really hard to achieve in an air-cored choke since i do not have properly sized laminated iron cores on hand.
Here is the schematic that i will be using
1. is this a good schematic for DCTC?
i want to use 4 mots to maximize my PSU since i have 5 pcs but im limited to 40pcs CDE caps 0.15uF 2KV. i arranged it to give me 60nF at 24KV therefore 2 mots in series 2.2KV each = 4.4KVAC with voltage doubler = 8.8KVAC then rectify = 12.408KV times 2 because of the charging choke = 24.816KV at main caps.
2. btw, Im confused, why other people using atleast 50nF or more with MOT supply but i calculated mine using the formula by richie only 20+nF at 4KW
my secondary coil will be 8" in diameter with 4.5:1 ratio. ARSG with 6 flying electrode, 6-8" apart 12000RPM = 1200BPS max.
3. our house is equipped with 30A circuit breaker. will this trip without a ballast using the schematic above?
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what to do with these MOTs and caps
