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Egg Circuit Revisited - A Solid State Driver
Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>
I've rewound the variac core with 15AWG and it seems to work a little
better. I still don't think I have enough windings so I'm going to add
another couple of layers tomorrow.
While testing the newly wound core tonight, I became frustrated with the
waste of power and the excessive heat generated by the resistors which
create the second phase.
I would like to find a better way to create the additional phase. I have
looked at various triac and scr circuits as well as plans for DC to AC
inverters. The inverter circuits are closer to what I need but I already
have 120VAC so I need to work directly with it rather than create a power
supply to drop to 12VDC and then back to 120VAC using another transformer.
Most of the circuits use a center tapped transformer to combine the two half
waves together and boost the voltage to 120V. This is not useful.
The only circuit that seems promising is this:
He is using 2 pairs of MOSFETs in sort of a push-pull arrangement to create
both positive and negative cycles in the same circuit. If I can find
replacement MOSFETs capable of handling 120VDC directly, I should be able to
double the circuit and invert the gates on the second set of MOSFETs which
should mimic two phase AC. Of course this will be a square wave output, but
I don't think the egg will mind.
Please let me know what you all think about this and if there may be a
better way (short of using 2 phase directly of course).