700 watt ZVS flyback arcs and driver Videos

jmartis2 Says:

Oct 14, 2008 - That's very nice, how is the flyback going, is it hot? Most of the flybacks I found burn out at ~500W (they short out internally and sometimes burst in flames!)

joyange1 Says:

Oct 14, 2008 - What you need to use is a flyback from a rear projection tv, they are twice a big as one from a tv and 3 times bigger then that of a computer monitor. As far as getting hot goes, I could run it for about a 2 minutes before it got to hot to touch. Then I would shut it down and let it cool off.

joyange1 Says:

Oct 14, 2008 - UMLTK: About 2 days after I shot this video, I was able to run it at over a 1100 watts (60V @ 19A). I wanted to take it up to 72 volts but the VDS on the mosfet was peeking at 192 volts and the max for the irfp250 is 200 volts. So i took a turn off the flybacks winding to make it a 4+4 turn, and that boosted the power without having to boost the voltage.

joyange1 Says:

Oct 14, 2008 - FYI: The arcs only got about 1.5cm longer when I ran it from 700watts to 1100watts. I think most of the power went to heating the flyback althought I saw no clipping on the scope.AWOW: I only ran it for about 10 seconds and then check the temp and althought it was cool to the touch at first about 5 seconds later it got super hot. The sec. winding got hot soo fast, that it took a few seconds for the plastic housing to conduct the heat to the surface.

joyange1 Says:

Oct 14, 2008 - FN: I really don't know how far I can push this flyback, but I got this rule about electronics and that is, "If it's too hot to touch!, IT'S TOO HOT!!!".

jmartis2 Says:

Oct 14, 2008 - Thanks for the info, I once ran a flyback at 600W (video is in my profile) but just for a few seconds.Too bad I can't see any rear projection TV's thrown away :P I have to use "multi-flyback" for more power (I once used a quad-flyback that gave 30cm arcs and it blew my driver :D)

Aeryk333 Says:

Oct 14, 2008 - "If it's too hot to touch!, IT'S TOO HOT!!!" I can very agree with you on this.

hboy007 Says:

Oct 14, 2008 - that's a nice flyback video. Thanks for sharing with us

jovicakluk Says:

Oct 14, 2008 - how much Ma ont the hv side what is voltage

SKarmytech Says:

Oct 14, 2008 - please can you tell how do you identify the feedback, primary coil and secondary base pins on a 15 pin flyback? please reply

SKarmytech Says:

Oct 14, 2008 - please can you tell how do you identify the feedback, primary coil and secondary base pins on a 15 pin flyback? please reply

Hungryhowiepizza Says:

Oct 14, 2008 - lol ur relly pushing ur flyback there nice job im going to try a rear projection on my zvs see if i can get that power if i evin go that high with any of my flybacks i get internal arcing and one time one of my flybacks exploded lol that was scarry..

joyange1 Says:

Oct 14, 2008 - I would just use a ohmmeter and see witch pins have the hiest resistance(around 4 ohms).FYI: For the ZVS driver, You need to wind your own primary coil as you can seen in the video the 2 red and blue windings on the flybacks ferite core. Its a 4+4 turn configuration. Look at a ZVS driver schematic for more infomation.

RockeyDA Says:

Oct 14, 2008 - do you have to get all that stuff to get it runing?

OceanBluiys Says:

Oct 14, 2008 - how can you pump 700 volts when irfp250's are rated at 200 watts each

dannybeckett01 Says:

Oct 14, 2008 - my wires keep melting (negative side anyway because of internal rectification). what have you done to stop this from happening?

joyange1 Says:

Oct 14, 2008 - That 200 watts of power dissipation. That means how much power the device can resist and turn into heat. For example, Let say you turn it on at 50% and run 20v@10A(200W)(supply), that means your load is getting 10V@10A(100W) and the other 10V@10A(100W) is being absorbed by the MOSFET itself and dissipating that waste energy as heat. The IRFP250 can handle 200v@30A(6000W). At a full 30A load @ 8mOHMs (fully turned on.) that a 2.4 volt drop @ 30A equals about 72 watts of dissipation.

joyange1 Says:

Oct 14, 2008 - Use a bigger wire. The wire you are using is not a heavy enought gauge to support the load.BTW:What do you mean by internal rectification, You're not talking about the damper diodes in the mosfets are you?

OceanBluiys Says:

Oct 14, 2008 - ohhh i get it lol

SINEKT Says:

Oct 14, 2008 - Hi, I did a ZVS today and the MOSFETS blew up right away in a very spectacular way, actually caught fire and burned with flames :)))The thing is I used a very powerful toroidal transformer to power the circuit (26V) and normal, not FAST diodes. I also didn't have a heatsink, but it would have been useless anyway, they didn't blow up because of that.What am I doing wrong ?I posted a video about this, search please if u want for "ZVS Flyback Driver BLOWS UP".Thanks !!!

hboy007 Says:

Oct 14, 2008 - just for closure ...the main problem in ciruit design are switching losses, so if turning off the FET at full current wastes 0.01Ws of energy and the switching frequency is 20 kHz, then 200Ws per sec respectively 200W of power are dissipated plus 10-20W for on-resistance losses. The thing that makes the zero-current switching mode work so well is FETs being switched at zero current (hence the name). Got it? :)

zezimashock Says:

Oct 14, 2008 - i thought the lowest,or was i thinking ronge?couse my flyback working verry wel on the lowest pinns,check my vid :P

samssoftwareuser Says:

Oct 14, 2008 - why don't you make a singing arc?ps cool vid:D and why so much stuff?i thought u just need an ac adaptor and your sweet?

jovicakluk Says:

Oct 14, 2008 - he need so much things to provide the power needed to run the zvs driver at 700watts