Re: need 24V to 115VAC 3 phase inverter for gyro


"Robert Bonomi" <bonomi@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:11m7ghl8h9ss6a5@xxxxxxxxxxxxxxxxxxxxx
> In article <1130574054.945062.63630@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
> <acannell@xxxxxxx> wrote:
>>I've got an ARU 44 gyro and I'd like to power it off my 24VDC system.
>>It needs 115VAC 3 phase, and about 75W to 100W. Is there an off the
>>shelf unit that can do this, or maybe someone knows of a schematic to
>>build my own? I'm an electronics engineer so I can do this, but
>>inverters are not my specialty so any guidance would be greatly
>>appreciated.
>>
>
> WAG says it's probably 400 cycle, as well. not 60Hz.
>
> Design can be fairly simple, particularly if you use a micro-controller
> for the 'logic' of phase generation.
>
> start with a clock that is 2 X phases X frequency,
> Feed it into a counter, that counts from 0 to (phases-1).
> Hang a number of comparators on the counter outputs, one that
> triggers for each value.
> Send each comparator output through a flip-flop.
> (this gives you a 50% duty-cycle output for each phase,
> and at the right frequency.)
>
> [now for the "analog> stuff :)
>
> low-pass filter to sine-wave.
>
> Amplify to get the needed voltage/current levels.
>
> Voila!

And how does this manage to produce 110 volts from 24?
Some kind of transformer wil be required.
Step-up rectifying might be an option
but will be hard at these power levels,
i.e. require huge condensers.

But I'm afraid I am no more able than you
to really fill O/P's request for a schematic

PS does anyone know how important the true
sine wave is for this kind of equipment?


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