Thanks for the link for the basics. I have to read that. In the mean time, I had one more try. It drives the gate to source voltage using pairs of op amps with their inputs crossed. The pairs effectively work as a low power h bridge--i.e. a voltage drop across the inputs can redirect the output voltage either forward or backward (up or down, you get the idea) across the two outputs.

Also, I know a transformer will dissipate some power as heat, but I thought a flyback or flyforward was one of the more efficient dc dc (or dc ac) conversion methods--at least at high frequencies.

 

Ummm ! Higher frequencies ?

An Inverter at high frequencies ..EH!

What would be the load for this I wonder ??

 

1. For developing MOSFET circuits, I find LTSpice very useful.
It's free, and I can test the behaviour/voltage levels at DC.
There are also various voltage sources including AC.

2. For the deadtime, you may find the new extended midrange PICs interesting. Their PWM module has programable deadtime! I don't know if this is present for all of ext. midrange but I saw it in the datasheet for the one's I have here (16f1503).

 

This one may also be helpful: http://www.irf.com/technical-info/whitepaper/s30p5.pdf

@Praondevou, thank you for that link. I'm seeing more and more people that should know better, say that the intrinsic body diode in a mosfet over-rides the use of a separate diode in a circuit.

 

I am working on a full bridge version of the zvs driver as seen here: http://www.teravolt.org/zvs-driver/
I would like to either build an induction heater

I was looking to find a method that would scale to work with off 120V@15A after I feel comfortable at lower power.

If I understand that ZVS driver, it creates a sine wave by operating the fets in linear region. If I understand your current requirement (15A), by operating your fets in linear region, you will be dissipating more energy into your uber massive heatsink than you will into your load. Unless, I've missed something.

 

If I understand that ZVS driver...

Apparently I don't

A keen eye will notice that this oscillator is zero-voltage switching (ZVS), meaning that the mosfets switch when they have zero volts across them. This is good because it allows the mosfets to switch when they are carrying the least power; something that for the most part eliminates the switching losses which generate huge amounts of heat. This means only small heat sinks are needed, even when oscillating 1000 watts

 

@strantor, so it seems I can use that for high current and/or high voltage if I understand correctly. If nothing else, take a look at the driver I posted here:
http://forum.allaboutcircuits.com/attachment.php?attachmentid=42437&d=1335761587
I only showed one leg, but I think you get the idea.
That will definitely keep the mosfets saturated.

 

@strantor, so it seems I can use that for high current and/or high voltage if _I_ understand correctly

LOL yeah if WE understand correctly, you can.

 

"A keen eye will notice that this oscillator is zero-voltage switching (ZVS), meaning that the mosfets switch when they have zero volts across them. This is good because it allows the mosfets to switch when they are carrying the least power; something that for the most part eliminates the switching losses which generate huge amounts of heat. This means only small heat sinks are needed, even when oscillating 1000 watts"

I don't think that's always true. I recommend reading http://www.ee.cityu.edu.hk/~shc/Chapter7.doc and http://books.google.ca/books?id=eS1...a=X&ei=zrueT6b5IMeZ6AH895mfDw&ved=0CGQQ6AEwBg