650 watt ZVS(part one)

Sorry that i had to make 3 small videos, but my camera sucks, and i had to download right onto my computer, and the camera would turn off after a few minutes.

Anyway, on to the technical stuff.

The resistor(in place of 470 ohms) is a single 1kohm resistor, tapped in the middle for about 500 ohms to each mosfet gate(Thank you 4hv.org and Mike Kalish for the resistor). The mosfets are irfp250 30 amp 200 volts. I am using the original 10kohm resistor, uf4007 fast diodes and 1 watt 12 volt zeners. The flyback is a nice pretty big one from a rear projection television. Power supply is rewound microwave transformer, about 30 volts ac out and after rectification and smoothing with a large load, it is about 35 volts dc. The bridge rectifier is only 4 amps, but i can actually run for quite awhile without dying(does get hot) even without a fan. Smoothing capacitor is 15000uf 71 volt lytic from an old stereo system.

It pulls 18.5 amps max with the flyback on the 2nd video, and i think 16.2 amps with the second flyback, at 35 volts. That is almost 650 watts for the flyback on the 2nd video and about 570watts for the flyback in the third.

It is ugly, i know, but i put it all together in a ew minutes, and this is how it is going to stay. I am planning on putting it into a wooden box, that will be stained and then put some polyurethane to protect it from moisture and other bad stuff.

I put the other(red) winding from the microwave transformer in series with the blue one for about 35 volts ac, when it is loaded down with the zvs it is 40 volts dc, pulling about 17 amps with one flyback and 20 with the other, which is 800 watts!

Category:

Education

Tags:

• High
• voltage
• flyback
• transformer
• resonance
• zvs
• zero
• switching
• mosfet
• spark
• arc
• coil

[bennjanse]

I like this - my parts is due only on Tuesday cause no-one works on holidays in this freaking south africa - nice work !!