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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
You can take it off the board and leave the other windings in place.
If you have a cheap multimeter you can trace the primary coil inputs, instructions are on the net if you look, but, if I remember correctly, the primary coil is the two inputs that have the least resistance (as long as it isn't zero).
Grenadier, can you give me a link to a ZVS driver that will get 50 milliamps out of a flyback?
(I'd love to do this, to prove to people who run 'another website' that it is possible.)
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Ash, if I remember correctly, the zvs circuit does not operate in flyback mode, so you can simply put more turns on the primary, and get lower voltage, higher current output. (just normal zvs circuit. remember to lower your cap value if you need to keep the frequency up.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I got 80mA @ 16kV out of mine, somewhere around 1.2kW. It was just a regular ZVS with IRFP260s, 30 turn inductor on a ferrite toroid, and 470 ohm gate resistors.
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
yes you can just take out the fly back and pulse it but you will have to do it 100s or 1,000s time per sec, thats what these drivers do. and is why your tv make that hi pitch sound when you turn it on its the fly back vibrating at 1,000s of Hz ( cycles per second) from the "pulses"
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
OK, I get it, you don't get the same voltage, but you get more amps.
Sorry, I assumed you meant you'd get more amps at the same voltage.
I can see that this would give you lethal amps, but it's not running in flyback mode.
Is it possible to get >20milliamps at >20kilovolts from a flyback? (I have a few flybacks from early colour TVs, can't remember offhand if they are hitachi or panasonic, one of the two, but they are rumoured to be among the most powerful flybacks available)
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Yeah but then you need to disable all the protection circuitry, plus that board is huge and clunky.
Dang ninja posts. @Ash, on a ZVS you can control what you want. A larger value inductor means more volts, but less amps. Really all it takes is trial and error, but 20kV at 20mA is certainly possible with a ZVS.
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Can anyone help me?
