[Milsurplus] 400 Hz Static Inverter

[J. Forster]

If I have to build something, I'd drive a transistor push-pull pair from a
generator and wind a primary on a 400 Hz Variac core.

-John

============



> All: A long time ago I built a 400-Hz power supply out of an old PA
> amplifier, a transformer, and a 400 Hz oscillator I made from a 555 timer
> chip and a 3-stage RC lowpass filter.  It made a dandy 400 Hz supply for
> an
> ARC-38A.  For single-phase 400 Hz power, that's the way I'd go if the
> power
> requirement were modest (less than 100 watts or so).
>
> If the requirement is 3-phase power, three D-type flip-flops in series,
> with
> the not-Q output of the last one tied to the D input of the first, a
> common
> clock signal at 2400 Hz (555 timer again), and a reset to ensure that all
> three flip-flops are reset before the clock starts should produce a very
> good 400 Hz three-phase signal.  Running each output through the RC
> filters
> as described would generate very nice 400 Hz sinewaves 120 degrees
> apart...you'd have to find three PA amplifiers, though.
>
> A more sophisticated approach would be to use an Arduino board or similar
> to
> produce three 2-bit-wide outputs to create 400 Hz 3-phase power.
>
> All this is presuming you want to spend the time to do all this.  The
> motor
> controller might make more sense.
>
> Thanks,
> Dave WB4FUR
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Francesco Ledda
> Sent: Sunday, April 29, 2012 10:53 PM
> To: KD7JYK DM09
> Cc: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] 400 Hz Static Inverter
>
>
> Who do you want to modify it? Many have single paste input and 3 phase
> output. They are ready to go.
>
> Sent from my iPad
>
> On Apr 29, 2012, at 9:13 PM, "KD7JYK DM09" <kd7jyk at earthlink.net> wrote:
>
>> : Yes. That's exactly what I'm considering, but I'd like to find a
>> : brand/model that is known to be modifyable. Prints would be a real
> bonus.
>>
>> I didn't find anything on the web, although they used to be everywhere -
> ten
>> to fifteen years ago.  The only printout I have is buried, never to be
> seen
>> again.
>>
>> Kurt
>>
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