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Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I've been thinking how feasible it will be to modify my zvs driver for 960VDC
sound crazy but iwas thinking to use the STW9N150 Mosfet witch is good for 1.5kv @8 amps only $11!!
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Some people have ran flybacks on rectified mains!!!!!!!!
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
digikey has 200 volt zeners i could stack 5 of them.
And i have 1kv ultrafast diodes on my zvs right now
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
ubuntupokemoninc wrote ...
Some people have ran flybacks on rectified mains!!!!!!!!
I assume that comment is adressed to me.
The point I was making is that 8 amp mosfets won't be suitable for ~1000volts because you'll have to limit the current to 8 amps (according to my limited understanding)
If you want to use a higher voltage to push more amps through the primary you need high amperage mosfets (obviously the duty cycle is a factor here)
Someone please correct me if my assumptions are incorrect.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
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Also keep in mind, mosfets that can handle that type of voltage cost money. 1000V mosfets at any decent current ratings (also count dissapation) come in quite expensive. not something you want to kill. (or can kill for that matter, Ive yet to destroy my 1000V 40A Isotop fets) you can use NPT 1200V IGBTs if you want, but you will need to modify the circuit so that they have sufficient gate charge. 12V to the gate wont cut it. most common IGBTs have +/-30V charge. Also, higher power mosfets in said packages are also more common in 25V/30V charge as well.
The STW9N150, with 1.8-2.5 ohm on resistance, and only the dissapation capability of 320W... good luck cooling that thing down at any decent power.
That bit aside, it is rather pointless to use higher voltage, you will not get any bigger arcs and most likly screw either flyback or driver from overvoltage.
What you should be doing, is to run at higher wattage and current, thats where your spark lenth is for ZVS, extra voltage will just cause you much pain and headaches, and the output is hardly worth it.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
actually my plan was to make a home made flyback, get a crud load of voltage out of it, I'd use a EI ferrite core, what if it put 30 volts to the part of the circuit that makes it oscillate, then put the 960vdc through the inductor then through the primary, I'll make a schematic to show you what i mean
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I'm not really sure how or why it oscillates
I realize the fets turn on when the voltage across them is 0v
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Chuck norris flyback driver
