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I recently wound two identical flybacks that put about 5 kv ac each. If I connect the secondaries in series, can i use them to run I want a full wave CW? If so, supposing that I use 5 stage CW, the output will be 10*5kv, or 10*10kv? Or, do I need to use a single flyback with center tapped scondary? Thanks in advance.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
kimbomba wrote ...
I recently wound two identical flybacks that put about 5 kv ac each. If I connect the secondaries in series, can i use them to run I want a full wave CW? If so, supposing that I use 5 stage CW, the output will be 10*5kv, or 10*10kv? Or, do I need to use a single flyback with center tapped scondary? Thanks in advance.
It's generally not good practice to wire the secondaries of hv transformers in series because of the likelihood of insulation breakdown. This question often comes up when newbie electronic hobbyists want to wire multiple M.O.T.'s in series for increased voltage. When you do that, the "hot" wire from one of the transformers is connected to the "ground" wire of the other transformer which happens to be physincally very close to the metal core, which will cause arcing, resulting in burnt insulation. There are a couple of better ways to increase your voltage, and they are: 1. Use one flyback feeding two CW multipliers. One CW produces positive voltage, and the other produces negative voltage. The difference between the two outputs will be double what a single CW can output. But keep in mind that the doubled hv is not referenced to ground. 2. If that configuration doesn't provide enough currect for your application, then use two flybacks where one will drive a positive CW, and the other will drive a negaive CW. Again you have the same situation where the doubled hv will not be referenced to ground, but if that's Okay for your application, then go with it.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
It would work if you made a center tapped transformer. Just flip one secondary upsidedown so the coils are turning the opposite direction, then connect the two ground wires together. +HV one side and -HV the other, (of course it'll alternate).
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I see no problem in using two separate similar flybacks; connect together the innermost wire of each secondary to form your common 0v
You will need two switch transistors, one for each flyback driven alternately. This could be as simple as a squarewave driving one transistor and the inverted squarewave driving the other. You can vary power throughput by varying the frequency, lower frequency = more power
To maximise power throughput you could have each transistor ON for more than half a cycle, easy with a few binary counter stages and a little logic. (e.g. a 4-stage binary counter can give up to 15:1 MARK:SPACE ratio)
Or two monostables, one triggered on the positive edge of the squarewave and one on the negative.
The outer (best insulated) wire of each secondary will now be alternately pulsing; -suitable for driving a full-wave C-W (Greinacher) multiplier
Thanks for replies. I have now the two flybacks back to back with a single primary driving both. In this conficuration, it is not posible to use it for a full CW multiplier. ?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hi kimbomba her is a link for your question
fullwave cetertap is your best bet. I did it with 4 identical flybacks, 2 parallel sets of 2 out of phase usung gruond for cenertap. I would recomend a ZVS circuit
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Flyback driven full wave CW multiplier
