People that build commercial sized inverters, welding equipment, plasma
cutters...etc. Might have a simulation package. I was just suggesting a
semi real world test jig for 3 phase applications.

In the past I have worked with some very large Inverters or UPS units
(200 KW) these used triacs for switching. Something some how caused a
phase inversion and a triac (500 Amp variety) switched out of
phase....it was a mess to say the least, and I lost part of my data
center for a while...

Vern

Chris Loiacono wrote:
>
> This sounds like a fun project. If only I had the time to put one
> together....
> I once set up a spice sim for simple 2 SCR single-phase t - V relationships,
> and it was a fair amount of work.
> That got me hoping that someone might package a software tool that was
> actually marketed for poly-phase power line simulations - especially since I
> can't imagine the amount of work in a spice set-up for three-phase and 6
> SCR's...
>
> C
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Vern Jones
> Sent: Friday, July 11, 2003 2:59 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE] Another 3 phase AC thingy
>
> Hello Chris,
>
> It is possible to build one using a pic to generate the phases, run the
> phases at high frequency to drive a triple set of D/A outputs, filter
> well and use 3 power amplifiers to drive 3 transformers in a step up
> mode. Adjust the analog signals until the output voltages are matched at
> the three transformer outputs. Connect the three transformers in a delta
> or y configuration to match the mains you will be simulating. Use
> something like a LM3886 as the power amplifiers to simple 12 Volt
> step-down transformers. Connect the 12 volt winding to the output of the
> power amplifier.
>
> This can also be simulated with a simple 3 bit counter with the outputs
> taken through an additional flip-flop to generate the three phases, then
> opamp low pass filter them power amp to transformers. Adjust the drive
> frequency to the 3 bit counter to your simulated mains frequency, adjust
> the gain for the desired mains voltage...
>
> Vern
>
> Chris Loiacono wrote:
> >
> > Does anyone know of reasonably priced simulation tool that will let me
> > measure time and voltage relationships in 3-phase 6 SCR phase angle
> > controlled circuits?
> > Life would be so much simpler for me with something that would let me see
> > SCR voltages at various firing angles.....
> >
> > TIA,
> > Chris
> >
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