I built my first ZVS driver a while ago and had some fun making big arcs before I blew up the MOSFETs trying to make some alterations for induction heating. When it comes to this stuff I dont know exactly whats going on, but I know how to put it together well enough from a diagram.
I'm going to build another ZVS driver and I'm wondering: if I get IGBTs rated at 900 V and about 30 A, increase the capacitance, the inductance of the choke, and the number of turns on the primary, would I be able to rectify 120 VAC to about 170 VDC (with smoothing caps) and run it all with no transformer?
I know IGBTs need lower frequencies, so I figured upping the capacitance and number of turns on the primary will lower the frequency and I'm hoping that more inductance in the choke will limit the current input at 170 VDC.
Everything I see on-line says the voltage in the tank circuit is about 3-4 times the supply, so I figure 900 V for the IGBT should do it. Im just not sure about the current; would 20-30 A be enough? I can't draw more than 15 A with out tripping the breaker.
Am I on the right page here? I just don't want to order all this stuff and blow it up as soon as I turn it on.
(I have a transformer that can put out 48 V and the shorted secondary current is 10 A, but with my first ZVS it would not draw more than about 2 A, not until I made the alterations, and then it was pulling about 8 A and it made some funny sounds and POP!, there went the MOSFETs.)