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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
R v.d. Tuuk wrote ...
hello, i hooked up my home-brew fly-back and guess what :P i had first light butt not for long :( it draws so much current that every thing blows up i think i need other driver then my ne555 based any suggestions? could a zvs be a possibility?
The ZVS is very simple, and can put insane power through flybacks. There is almost no heating for me at 700 watts, so for 12-24 volts at 10-20 amps i am sure heat would be almost non-existent. Do not build it on your breadboard though, as it is extra capacitance and inductance which could be bad in serious conditions. The circuit is so small with so few components, you do not even need a PC board. I copied off Myke's zvs and just build it all on the pins of the mosfets (i actually used two PC board mount terminals for fast mosfet replacing). With this circuit you can run the mosfets almost right at the rated current. The mosfets should be rated for 4 times the supply voltage (you don't want more than 40 volts anyway, otherwise you will have a ton of power). At 700 watts, the 12 gauge stranded wire heats much more than the mosfets! Be careful choosing the inductor, as it must be the right permeability. Otherwise, saturation can occur, it will get very hot, and all of that good stuff.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
The yellow cored inductors you get from SMPs work well for the inductor. Make sure that the wire that you wind around the core can handle the current you put into the flyback and also that there are enough turns. Usually people just wind as many turns as they can onto the core. The wires going from the flyback's windings and the tank cap will carry more current than the wires going to the supply (unless something dies short).
Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
Need anymore help, just ask.
uhhm yes got a link to the design you used, i mean not the schematic for the zvs, but how you have build it. got all the parts except the mosfet's, they will be arriving soon :D i was not planing to build a zvs on a breadboard ;) and i am going to supply it with 29 volts, so don't worry me getting it over 40 :p actually i have a transformer that can deliver 80 vac but i am not using it now :D
(i am planing to use it for a teslacoil in the near future)
ow and the test was not in oil yet but if i hook it up to the zvs it wil be :P
EDIT the flyback had first light :P 13 turns primary not long after i shot this video it died (the mosfet ) :( i'll upload the video soon on youtube :) 29v in at unknown amps.
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need help building own flyback
