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Modding a cheap 240v/60hz to 115v/400hz

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Henrik_V:
A couple of amps at 115V is still a couple of x00 Watts ...
Do aircraft instrumentations (indicators) really need that much power?

A cheap solution migth be a transformer with split secondary and build a royer converter tuned to 400 Hz ...

Yansi:
Royer converter is not tuned. Royer converter is a hard switching one, using core saturation for commutation. (But sure, I understand you mean the very similar resonant topology, but that is not a Royer)

That is certainly not a cheap solution, that is an ugly solution.  With a about 300W output and with a reasonable Q of the LC tank of about about a few (say 2 to 5), you would need to size the primary side of the transformer to at least 600 to 1500 VA. That is one badass transformer (even though at 400Hz it will be quite smaller).
Then imagine the size of the resonant cap for 1500 VA. Probably not that bad, but now how about the input choke, that will have to pass the full input current at whatever low voltage and still have significant impedance at 400Hz?

georges shed:

--- Quote from: Henrik_V on June 09, 2020, 12:23:23 pm ---A couple of amps at 115V is still a couple of x00 Watts ...
Do aircraft instrumentations (indicators) really need that much power?

--- End quote ---

Probably not but at some stage i will want to run multiple instruments, I cant test their draw yet... I can always start with something small as a proof of concept :)

bdunham7:
OK, if the instruments will never be returned to actual service, the obvious solution to me is to open them up and see what the power supply actually does.  I would guess that internally they very likely would run on a single 28VDC supply because that is what airplanes without a 115VAC 400Hz bus would have.  The 115VAC 400Hz bus just allows you to both distribute power with small wires and use small transformers at the end--I don't think there are fans and gyro motors running on that.  Converting them may be far simpler than rigging up a 400Hz supply.

Yansi:

--- Quote from: bdunham7 on June 09, 2020, 01:49:12 pm ---Converting them may be far simpler than rigging up a 400Hz supply.

--- End quote ---

I very strongly doubt that, unless they are some very very simple instruments. Especially, when the OP can't help himself with obtaining 115V 400Hz in the first place, modding any kind of avionics is I'd say outta question. I think there are many options to skin the cat here and most of them are appropriate and easy solutions (unlike some).  Just see back above.

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