RE: Egg Circuit Revisited - A Solid State Driver

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>

Hi Mike,

Notice I said I'd double the circuit, meaning I'd use 8 MOSFETs total. But I
was wrong about inverting the gates.

Thanks,
Cameron

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Sunday, October 15, 2006 1:29 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: Egg Circuit Revisited - A Solid State Driver
>
> Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
>
> I could be wrong, but at first look it seems the output would be
> single phase still (1 pair of mosfets handles the + pulses and the
> other -). Have you tried using C with more R so the resistors don't
> cook as much? You could also use (2) 60 hz (not critical to spin an
> egg) versions of flyback circuits:
> http://www.electronics.50g.com/cdcac.htm and some how keep them
> within 120o of each other, but then it's getting about as bulky as a
> 2-phase generator set.
>
> Mike
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Sunday, October 15, 2006 10:32 AM
> Subject: Egg Circuit Revisited - A Solid State Driver
>
>
> >Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>
> >
> >Hey guys,
> >
> >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:
> >http://www.interq.or.jp/japan/se-inoue/e_ckt30_1.htm
> >
> >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).
> >
> >Thanks,
> >Cameron
> >
> >
>